Progress in error handling

* Make Systick a 100us Timer. Millisecond ticks are still untouched.
* LCD now has a 100us resolution tick
* LCD uses 500us delay for waitstate
* Make 'About' menu verbose:
	* Add 3 page menu
	* 1st page: Generic info
	* 2nd page: Version info
	* 3rd page: Uptime in seconds

.gitmodules

@@ -1,3 +1,7 @@
 [submodule "stm-firmware/shellmatta"]
 	path = stm-firmware/shellmatta
 	url = https://git.shimatta.de/mhu/shellmatta
+[submodule "c-style-checker"]
+	path = c-style-checker
+	url = https://git.shimatta.de/mhu/c-style-checker.git
+	branch = master

c-style-checker

@@ -0,0 +1 @@
+Subproject commit 3a58e3dd1c2ef6de78df89c8fdc7ba96b51cd4e0

measurement-data/Analog_Measurement_Analysis.ipynb

@@ -391,7 +391,12 @@
    "outputs": [],
    "source": [
     "print(calc_temp(1000.6)-calc_temp(1000.4))\n",
-    "print(1/4096*2500)"
+    "\n",
+    "adc_min_res = 1/4095*2500\n",
+    "print('Min res: ', adc_min_res)\n",
+    "\n",
+    "print(calc_temp(2000))\n",
+    "print(calc_temp(2000+adc_min_res))"
    ]
   }
  ],

stm-firmware/Makefile

@@ -5,7 +5,7 @@
 #Add Files and Folders below#########################################################
 CFILES 	= main.c syscalls.c setup/system_stm32f4xx.c systick.c
 ASFILES = boot/startup_stm32f4xx.S
-INCLUDEPATH = -Icmsis -Iinclude
+INCLUDEPATH = -Iinclude
 
 OBJDIR = obj
 target	= reflow-controller
@@ -30,28 +30,23 @@ CFILES += adc-meas.c
 # Shellmatta
 CFILES += shellmatta/src/shellmatta.c shellmatta/src/shellmatta_autocomplete.c shellmatta/src/shellmatta_escape.c shellmatta/src/shellmatta_history.c shellmatta/src/shellmatta_utils.c shellmatta/src/shellmatta_opt.c shell.c
 INCLUDEPATH += -Ishellmatta/api
-# DEFINES += -DSHELLMATTA_STRIP_PRINTF
+DEFINES += -DSHELLMATTA_HELP_ALIAS=\"?\"
 
 # RCC Manager
 CFILES += stm-periph/clock-enable-manager.c
-
 CFILES += stm-periph/uart.c stm-periph/dma-ring-buffer.c
-
 CFILES += digio.c
-
 CFILES += stm-periph/unique-id.c
-
 CFILES += calibration.c
-
 CFILES += temp-converter.c
-
-CFILES += rotary-encoder.c
-
+CFILES += rotary-encoder.c button.c
 CFILES += stack-check.c
-
+CFILES += ui/lcd.c ui/menu.c reflow-menu.c
 #CFILES += onewire-temp-sensors.c
-
 CFILES += fatfs/diskio.c fatfs/ff.c fatfs/ffsystem.c fatfs/ffunicode.c fatfs/shimatta_sdio_driver/shimatta_sdio.c
+CFILES += pid-controller.c oven-driver.c
+CFILES += settings/settings.c settings/settings-sd-card.c
+CFILES += safety-adc.c
 
 DEFINES += -DDEBUGBUILD
 
@@ -65,7 +60,7 @@ LFLAGS = -mlittle-endian -mthumb -mcpu=cortex-m4 -mthumb-interwork
 LFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16 --disable-newlib-supplied-syscalls -nostartfiles
 LFLAGS += -Tstm32f407vet6_flash.ld -Wl,-Map=$(mapfile).map
 
-CFLAGS = -c -fmessage-length=0 -mlittle-endian -mthumb -mcpu=cortex-m4 -mthumb-interwork
+CFLAGS = -c -mlittle-endian -mthumb -mcpu=cortex-m4 -mthumb-interwork
 CFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16 -nostartfiles -O0 -g
 CFLAGS += -Wall -Wextra -Wold-style-declaration -Wuninitialized -Wmaybe-uninitialized -Wunused-parameter -Wimplicit-fallthrough=3 -Wsign-compare
 ####################################################################################
@@ -73,6 +68,8 @@ CFLAGS += -Wall -Wextra -Wold-style-declaration -Wuninitialized -Wmaybe-uninitia
 OBJ = $(CFILES:%.c=$(OBJDIR)/%.c.o)
 ASOBJ += $(ASFILES:%.S=$(OBJDIR)/%.S.o)
 
+all: default
+
 default: $(target).elf
 
 %.bin: %.elf
@@ -80,7 +77,6 @@ default: $(target).elf
 %.hex: %.elf
 	$(QUIET)$(OBJCOPY) -O ihex $^ $@
 
-
 #Linking
 $(target).elf: $(OBJ) $(ASOBJ)
 	@echo [LD] $@
@@ -98,10 +94,13 @@ $(ASOBJ):
 	@echo [AS] $@
 	$(eval OUTPATH=$(dir $@))
 	@mkdir -p $(OUTPATH)
-	$(QUIET)$(CC) $(CFLAGS) -MMD -MT $@ $(INCLUDEPATH) $(DEFINES) -o $@ $(@:$(OBJDIR)/%.S.o=%.S)	
+	$(QUIET)$(CC) $(CFLAGS) -MMD -MT $@ $(INCLUDEPATH) $(DEFINES) -o $@ $(@:$(OBJDIR)/%.S.o=%.S)
 
 
-.PHONY: qtproject clean mrproper objcopy disassemble
+.PHONY: qtproject-legacy qtproject  clean mrproper objcopy disassemble program
+
+program: $(target).elf
+	./program-device.sh $<
 
 disassemble: $(target).elf
 	$(QUIET)$(OBJDUMP) -D -s $< > $(target).lss
@@ -113,8 +112,10 @@ mrproper: clean
 
 clean:
 	@echo "Cleaning up derived files..."
-	$(QUIET)rm -f $(target).elf $(target).bin $(target).hex $(OBJ) $(ASOBJ) $(mapfile).map $(CFILES:%.c=$(OBJDIR)/%.c.d) $(ASFILES:%.S=$(OBJDIR)/%.S.d)
-qtproject:
+	$(QUIET)rm -f $(target).elf $(target).bin $(target).hex $(OBJ) $(ASOBJ) $(mapfile).map $(CFILES:%.c=$(OBJDIR)/%.c.d) $(ASFILES:%.S=$(OBJDIR)/%.S.d) 
+	$(QUIET)rm -rf $(OBJDIR)/*
+
+qtproject-legacy:
 	echo -e "TEMPLATE = app\nCONFIG -= console app_bundle qt" > $(target).pro
 	echo -e "SOURCES += $(CFILES) $(ASFILES)" >> $(target).pro
 	echo -ne "INCLUDEPATH += " >> $(target).pro
@@ -124,4 +125,22 @@ qtproject:
 	echo -ne "\nDEFINES += " >> $(target).pro
 	echo "$(DEFINES)" | sed "s/-D//g" >> $(target).pro
 
+qtproject:
+	$(QUIET)rm -f $(target).files $(target).cflags $(target).config $(target).creator $(target).includes $(target).creator.user
+	echo "Generating source file list"
+	$(QUIET)echo "$(CFILES)" | tr ' ' '\n' > $(target).files
+	@echo -n "Appending found header files from folders "
+	@echo `echo $(INCLUDEPATH) | sed "s/-I//g"`
+	$(QUIET)for dir in `echo $(INCLUDEPATH) | sed "s/-I//g"`; do \
+		find `echo "$${dir}"` -name "*.h" >> $(target).files; \
+	done
+	@echo "Generating $(target).cflags"
+	$(QUIET)echo "" > $(target).cflags
+	@echo "Generating $(target).includes"
+	$(QUIET)echo $(INCLUDEPATH) | sed "s/-I/,/g" | tr , '\n' | sed "/^$$/d" > $(target).includes;
+	@echo "Generating $(target).config"
+	$(QUIET)echo $(DEFINES) | sed "s/-D/,#define /g" | tr , '\n' | sed "/^$$/d" > $(target).config
+	@echo "Generating $(target).creator"
+	$(QUIET)echo "[GENERAL]" > $(target).creator
+
 -include $(CFILES:%.c=$(OBJDIR)/%.c.d) $(ASFILES:%.S=$(OBJDIR)/%.S.d)

stm-firmware/adc-meas.c

@@ -36,6 +36,7 @@ static volatile int * volatile streaming_flag_ptr = NULL;
 static uint32_t filter_startup_cnt;
 static volatile float adc_pt1000_raw_reading_hf;
 static volatile uint16_t dma_sample_buffer[ADC_PT1000_DMA_AVG_SAMPLES];
+static volatile uint32_t adc_watchdog_counter = 0UL;
 
 volatile float * volatile stream_buffer = NULL;
 volatile uint32_t stream_count;
@@ -69,12 +70,12 @@ static inline void adc_pt1000_setup_sample_frequency_timer()
 
 static inline void adc_pt1000_disable_adc()
 {
-	ADC1->CR2 &= ~ADC_CR2_ADON;
+	ADC_PT1000_PERIPH->CR2 &= ~ADC_CR2_ADON;
 	DMA2_Stream0->CR = 0;
 
 	pt1000_error |= ADC_PT1000_INACTIVE;
 
-	rcc_manager_disable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(RCC_APB2ENR_ADC1EN));
+	rcc_manager_disable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(RCC_APB2ENR_ADC3EN));
 	rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(ADC_PT1000_PORT_RCC_MASK));
 }
 
@@ -98,7 +99,7 @@ static inline void adc_pt1000_enable_dma_stream()
 	DMA2_Stream0->M0AR = (uint32_t)dma_sample_buffer;
 
 	/* Source is the ADC data register */
-	DMA2_Stream0->PAR = (uint32_t)&ADC1->DR;
+	DMA2_Stream0->PAR = (uint32_t)&ADC_PT1000_PERIPH->DR;
 
 	/* Transfer size is ADC_PT1000_DMA_AVG_SAMPLES */
 	DMA2_Stream0->NDTR = ADC_PT1000_DMA_AVG_SAMPLES;
@@ -111,7 +112,7 @@ static inline void adc_pt1000_enable_dma_stream()
 	 * Todo: Maybe use twice as big of a buffer and also use half-fill interrupt in order to prevent overruns
 	 */
 	DMA2_Stream0->CR = DMA_SxCR_PL_1 | DMA_SxCR_MSIZE_0 | DMA_SxCR_PSIZE_0 | DMA_SxCR_MINC |
-			DMA_SxCR_CIRC | DMA_SxCR_TCIE | DMA_SxCR_TEIE | DMA_SxCR_EN;
+			DMA_SxCR_CIRC | DMA_SxCR_TCIE | DMA_SxCR_TEIE | DMA_SxCR_EN | ((ADC_PT1000_CHANNEL  & 0x7)<<25);
 }
 
 static inline void adc_pt1000_disable_dma_stream()
@@ -128,32 +129,32 @@ static inline void adc_pt1000_disable_dma_stream()
 
 void adc_pt1000_setup_meas()
 {
-	rcc_manager_enable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(RCC_APB2ENR_ADC1EN));
+	rcc_manager_enable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(RCC_APB2ENR_ADC3EN));
 	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(ADC_PT1000_PORT_RCC_MASK));
 
 	ADC_PT1000_PORT->MODER |= ANALOG(ADC_PT1000_PIN);
 
 	/* Set S&H time for PT1000 ADC channel */
 #if ADC_PT1000_CHANNEL < 10
-	ADC1->SMPR2 |= (7U << (3*ADC_PT1000_CHANNEL));
+	ADC_PT1000_PERIPH->SMPR2 |= (7U << (3*ADC_PT1000_CHANNEL));
 #else
-	ADC1->SMPR1 |= (7U << (3*(ADC_PT1000_CHANNEL-10)));
+	ADC_PT1000_PERIPH->SMPR1 |= (7U << (3*(ADC_PT1000_CHANNEL-10)));
 #endif
 
-	ADC->CCR |= (0x2<<16);
+	ADC->CCR |= (0x3<<16);
 
 	/* Set watchdog limits */
-	ADC1->HTR = ADC_PT1000_UPPER_WATCHDOG;
-	ADC1->LTR = ADC_PT1000_LOWER_WATCHDOG;
+	ADC_PT1000_PERIPH->HTR = ADC_PT1000_UPPER_WATCHDOG;
+	ADC_PT1000_PERIPH->LTR = ADC_PT1000_LOWER_WATCHDOG;
 
 	/* Set length of sequence to 1 */
-	ADC1->SQR1 = (0UL<<20);
+	ADC_PT1000_PERIPH->SQR1 = (0UL<<20);
 
 	/* Set channel as 1st element in sequence */
-	ADC1->SQR3 = (ADC_PT1000_CHANNEL<<0);
+	ADC_PT1000_PERIPH->SQR3 = (ADC_PT1000_CHANNEL<<0);
 
-	ADC1->CR1 = ADC_CR1_OVRIE | ADC_CR1_AWDEN | ADC_CR1_AWDIE;
-	ADC1->CR2 = ADC_CR2_EXTEN_0 | ADC_CR2_EXTSEL_2 | ADC_CR2_EXTSEL_1 | ADC_CR2_ADON | ADC_CR2_DMA | ADC_CR2_DDS;
+	ADC_PT1000_PERIPH->CR1 = ADC_CR1_OVRIE | ADC_CR1_AWDEN | ADC_CR1_AWDIE;
+	ADC_PT1000_PERIPH->CR2 = ADC_CR2_EXTEN_0 | ADC_CR2_EXTSEL_2 | ADC_CR2_EXTSEL_1 | ADC_CR2_ADON | ADC_CR2_DMA | ADC_CR2_DDS;
 
 	adc_pt1000_set_moving_average_filter_param(ADC_PT1000_FILTER_WEIGHT);
 	adc_pt1000_set_resistance_calibration(0, 0, false);
@@ -323,18 +324,20 @@ void ADC_IRQHandler(void)
 {
 	uint32_t adc1_sr;
 
-	adc1_sr = ADC1->SR;
+	adc1_sr = ADC_PT1000_PERIPH->SR;
 
 	if (adc1_sr & ADC_SR_OVR) {
-		ADC1->SR &= ~ADC_SR_OVR;
+		ADC_PT1000_PERIPH->SR &= ~ADC_SR_OVR;
 		pt1000_error |= ADC_PT1000_OVERFLOW;
 		/* Disable ADC  in case of overrrun*/
 		adc_pt1000_disable();
 	}
 
 	if (adc1_sr & ADC_SR_AWD) {
-		ADC1->SR &= ~ADC_SR_AWD;
-		pt1000_error |= ADC_PT1000_WATCHDOG_ERROR;
+		ADC_PT1000_PERIPH->SR &= ~ADC_SR_AWD;
+		adc_watchdog_counter++;
+		if (adc_watchdog_counter >= ADC_PT1000_WATCHDOG_SAMPLE_COUNT)
+			pt1000_error |= ADC_PT1000_WATCHDOG_ERROR;
 	}
 }
 
@@ -369,6 +372,9 @@ void DMA2_Stream0_IRQHandler()
 		if (streaming_flag_ptr)
 			append_stream_buffer(adc_val);
 
+		if (adc_watchdog_counter > 0UL)
+			adc_watchdog_counter--;
+
 		/* Call moving average filter */
 		adc_pt1000_filter(adc_val);
 	}

stm-firmware/button.c

@@ -0,0 +1,97 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stm32/stm32f4xx.h>
+#include <reflow-controller/button.h>
+#include <stm-periph/stm32-gpio-macros.h>
+#include <stm-periph/clock-enable-manager.h>
+#include <stdint.h>
+#include <cmsis/core_cm4.h>
+#include <reflow-controller/systick.h>
+
+static volatile uint64_t to_active_timestamp;
+static volatile enum button_state int_state;
+
+void button_init()
+{
+	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(BUTTON_RCC_MASK));
+	rcc_manager_enable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(RCC_APB2ENR_SYSCFGEN));
+	BUTTON_PORT->MODER &= MODER_DELETE(BUTTON_PIN);
+	BUTTON_PORT->PUPDR &= PUPDR_DELETE(BUTTON_PIN);
+	BUTTON_PORT->PUPDR |= PULLUP(BUTTON_PIN);
+
+	to_active_timestamp = 0ULL;
+	int_state = BUTTON_IDLE;
+
+	SYSCFG->EXTICR[1] |= 0x3;
+	EXTI->IMR |= (1U<<4);
+	EXTI->RTSR |= (1U<<4);
+	EXTI->FTSR |= (1U<<4);
+	NVIC_EnableIRQ(EXTI4_IRQn);
+}
+
+enum button_state button_read_event()
+{
+	uint64_t time_delta;
+	enum button_state temp_state;
+
+	if (BUTTON_PORT->IDR & (1U<<BUTTON_PIN)) {
+		temp_state = int_state;
+		int_state = BUTTON_IDLE;
+		return temp_state;
+	} else {
+		time_delta = systick_get_global_tick() - to_active_timestamp;
+		if (time_delta >= BUTTON_LONG_ON_TIME_MS)
+			return BUTTON_LONG;
+		else if (time_delta >= BUTTON_SHORT_ON_TIME_MS)
+			return BUTTON_SHORT;
+		else
+			return BUTTON_IDLE;
+	}
+}
+
+void button_deinit()
+{
+	BUTTON_PORT->MODER &= MODER_DELETE(BUTTON_PIN);
+	BUTTON_PORT->PUPDR &= PUPDR_DELETE(BUTTON_PIN);
+	rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(BUTTON_RCC_MASK));
+	EXTI->IMR &= ~(1U<<4);
+	rcc_manager_disable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(RCC_APB2ENR_SYSCFGEN));
+}
+
+void EXTI4_IRQHandler(void)
+{
+	uint64_t time_delta;
+
+	/* Clear interrupts */
+	EXTI->PR = EXTI->PR;
+	__DSB();
+
+	if (BUTTON_PORT->IDR & (1U<<BUTTON_PIN)) {
+		time_delta = systick_get_global_tick() - to_active_timestamp;
+		if (time_delta >= BUTTON_SHORT_ON_TIME_MS && time_delta < BUTTON_LONG_ON_TIME_MS) {
+			int_state = BUTTON_SHORT_RELEASED;
+		} else if (time_delta >= BUTTON_LONG_ON_TIME_MS) {
+			int_state = BUTTON_LONG_RELEASED;
+		}
+	} else {
+		to_active_timestamp = systick_get_global_tick();
+	}
+}

stm-firmware/calibration.c

@@ -27,7 +27,7 @@
 #include <stdlib.h>
 #include <float.h>
 
-extern struct stm_uart shell_uart;
+enum calibration_shell_state {CAL_START = 0, CAL_WAIT_RES1, CAL_MEAS_RES1, CAL_WAIT_RES2, CAL_MEAS_RES2};
 
 void calibration_calculate(float low_measured, float low_setpoint, float high_measured, float high_setpoint,
 			   float *sens_deviation, float *sens_corrected_offset)
@@ -50,124 +50,217 @@ void calibration_calculate(float low_measured, float low_setpoint, float high_me
 
 
 
-int calibration_acquire_data(float *mu, float *max_dev, uint32_t count)
+float *calibration_acquire_data_start(uint32_t count, volatile int *flag)
 {
 	int status;
 	float *stream_mem;
-	float min_val = FLT_MAX;
-	float max_val = -FLT_MAX;
-	uint32_t i;
-	int ret_val = 0;
 
-	static volatile int flag = 0;
-
-	if (!mu || !max_dev || !count)
-		return -1000;
+	if (!count)
+		return NULL;
 
 	stream_mem = (float *)calloc(count, sizeof(float));
 	if (!stream_mem)
-		return -2;
+		return stream_mem;
 
-	status = adc_pt1000_stream_raw_value_to_memory(stream_mem, count, &flag);
+	*flag = 0;
+	status = adc_pt1000_stream_raw_value_to_memory(stream_mem, count, flag);
 	if (status)
-		return status;
+		goto free_mem;
 
-	/* Wait for data to be transferred */
-	while (flag == 0);
 
-	if (flag != 1) {
+	return stream_mem;
+free_mem:
+	free(stream_mem);
+	return NULL;
+}
+
+static int calibration_poll_data_acquisition(float *mem_array, uint32_t count, volatile int *flag, float *mu, float *max_dev)
+{
+	int ret_val = 0;
+	float min_val = FLT_MAX;
+	float max_val = -FLT_MAX;
+	uint32_t i;
+
+	if (!flag || !mem_array || !mu || !max_dev)
+		return -1000;
+
+	if (*flag == 0) {
+		/* Continue polling */
+		return 1;
+	}
+
+	if (*flag != 1) {
 		/* Error */
 		ret_val = -1;
 		goto ret_free_mem;
 	}
 
 	/* Convert the stream memory to Ohm readings */
-	adc_pt1000_convert_raw_value_array_to_resistance(NULL, stream_mem, count);
+	adc_pt1000_convert_raw_value_array_to_resistance(NULL, mem_array, count);
 
 	/* Do not compute std-deviation. Too imprecise
 	 * arm_std_f32(stream_mem, count, sigma);
 	 */
-	arm_mean_f32(stream_mem, count, mu);
+	arm_mean_f32(mem_array, count, mu);
 
 	/* Find min and max values of array */
 	for (i = 0U; i < count; i++) {
-		min_val = MIN(min_val, stream_mem[i]);
-		max_val = MAX(max_val, stream_mem[i]);
+		min_val = MIN(min_val, mem_array[i]);
+		max_val = MAX(max_val, mem_array[i]);
 	}
 
 	/* Compute maximum deviation range */
 	*max_dev = max_val - min_val;
 
 ret_free_mem:
-	free(stream_mem);
+	free(mem_array);
 	return ret_val;
 }
 
-static void wait_for_uart_enter()
+shellmatta_retCode_t calibration_sequence_shell_cmd(shellmatta_handle_t shell, const char *arg, uint32_t len)
 {
-	int enter_received = 0;
-	const char *recv_data;
-	size_t recv_len;
-	size_t iter;
-	int uart_recv_status;
+	(void)arg;
+	(void)len;
 
-	do {
-		uart_recv_status = uart_receive_data_with_dma(&shell_uart, &recv_data, &recv_len);
-		if (uart_recv_status >= 1) {
-			for (iter = 0; iter < recv_len; iter++) {
-				if (recv_data[iter] == '\n' || recv_data[iter] == '\r')
-					enter_received = 1;
+	/* This stores the current state of the calibration process */
+	static enum calibration_shell_state cal_state = CAL_START;
+	shellmatta_retCode_t ret_val = SHELLMATTA_BUSY;
+	uint32_t i;
+	int res;
+
+	static float mu = 0.0f, mu2 = 0.0f, dev = 0.0f, dev2 = 0.0f;
+	float sens_dev, offset;
+	static float *data_buffer = NULL;
+	static volatile int flag;
+	char *stdin_data;
+	uint32_t stdin_len;
+
+
+	switch (cal_state) {
+	case CAL_START:
+		/* Clear errors of PT1000 reading */
+		adc_pt1000_clear_error();
+		shellmatta_printf(shell, "Starting calibration: Insert 1000 Ohm calibration resistor and press ENTER\r\n");
+		cal_state = CAL_WAIT_RES1;
+		ret_val = SHELLMATTA_CONTINUE;
+		break;
+	case CAL_WAIT_RES1:
+		cal_state = CAL_WAIT_RES1;
+		ret_val = SHELLMATTA_CONTINUE;
+		shellmatta_read(shell, &stdin_data, &stdin_len);
+		if (stdin_len > 0) {
+			for (i = 0; i < stdin_len; i++) {
+				if (stdin_data[i] == '\r') {
+					cal_state = CAL_MEAS_RES1;
+					ret_val = SHELLMATTA_BUSY;
+					shellmatta_printf(shell, "Measurement...\r\n");
+					adc_pt1000_clear_error();
+					data_buffer = calibration_acquire_data_start(512UL, &flag);
+					break;
+				} else if (stdin_data[i] == '\x03') {
+					cal_state = CAL_START;
+				}
 			}
 		}
-	} while (enter_received == 0);
-}
-
-int calibration_sequence_shell_cmd(shellmatta_handle_t shell)
-{
-	float mu, mu2, dev, dev2;
-	float sens_dev, offset;
-
-	/* Clear errors of PT1000 reading */
-	adc_pt1000_clear_error();
-
-	shellmatta_printf(shell, "Starting calibration: Insert 1000 Ohm calibration resistor and press ENTER\r\n");
-	wait_for_uart_enter();
-	shellmatta_printf(shell, "Measurement...\r\n");
-
-	/* Clear errors of PT1000 reading */
-	adc_pt1000_clear_error();
-	calibration_acquire_data(&mu, &dev, 512UL);
-	shellmatta_printf(shell, "R=%.2f, Noise peak-peak: %.2f\r\n", mu, dev);
-	if (adc_pt1000_check_error() != ADC_PT1000_NO_ERR) {
-		shellmatta_printf(shell, "Error in resistance measurement: %d", adc_pt1000_check_error());
-		return -1;
-	}
-
-	/* Measure 2nd calibration point */
-	shellmatta_printf(shell, "Insert 2000 Ohm calibration resistor and press ENTER\r\n");
-	wait_for_uart_enter();
-	shellmatta_printf(shell, "Measurement...\r\n");
-
-	/* Clear errors of PT1000 reading */
-	adc_pt1000_clear_error();
-	calibration_acquire_data(&mu2, &dev2, 512UL);
-	shellmatta_printf(shell, "R=%.2f, Noise peak-peak: %.2f\r\n", mu2, dev2);
-	if (adc_pt1000_check_error() != ADC_PT1000_NO_ERR) {
-		shellmatta_printf(shell, "Error in resistance measurement: %d", adc_pt1000_check_error());
-		return -2;
-	}
-
-	/* Check noise values */
-	if (dev > CALIBRATION_MAX_PEAK_PEAK_NOISE_OHM || dev2 > CALIBRATION_MAX_PEAK_PEAK_NOISE_OHM) {
-		shellmatta_printf(shell, "Calibration failed! Too much noise. Check you're hardware.\r\n");
-		return -3;
-	}
-
-	/* Calculate calibration */
-	calibration_calculate(mu, 1000.0f, mu2, 2000.0f, &sens_dev, &offset);
-
-	shellmatta_printf(shell, "Calibration done:\r\n\tSENS_DEVIATION: %.4f\r\n\tOFFSET_CORR: %.2f\r\n", sens_dev, offset);
-	adc_pt1000_set_resistance_calibration(offset, sens_dev, true);
-
-	return 0;
+
+		break;
+	case CAL_MEAS_RES1:
+		if (!data_buffer) {
+			shellmatta_printf(shell, "Data acquisition failed!\r\n");
+			ret_val = SHELLMATTA_OK;
+			cal_state = CAL_START;
+			break;
+		}
+
+		res = calibration_poll_data_acquisition(data_buffer, 512UL, &flag, &mu, &dev);
+		/* Stay in this state until the measurements are finished */
+		if (res == 1) {
+			ret_val = SHELLMATTA_BUSY;
+			cal_state = CAL_MEAS_RES1;
+		} else if (res == 0) {
+			shellmatta_printf(shell, "R=%.2f, Noise peak-peak: %.2f\r\n", mu, dev);
+			if (adc_pt1000_check_error() != ADC_PT1000_NO_ERR) {
+				shellmatta_printf(shell, "Error in resistance measurement: %d", adc_pt1000_check_error());
+				ret_val = SHELLMATTA_OK;
+				cal_state = CAL_START;
+			} else {
+				ret_val = SHELLMATTA_CONTINUE;
+				shellmatta_printf(shell, "Insert 2000 Ohm calibration resistor and press ENTER\r\n");
+				cal_state = CAL_WAIT_RES2;
+			}
+		} else {
+			shellmatta_printf(shell, "Error in resistance measurement: %d", adc_pt1000_check_error());
+			ret_val = SHELLMATTA_OK;
+			cal_state = CAL_START;
+		}
+		break;
+	case CAL_WAIT_RES2:
+		cal_state = CAL_WAIT_RES2;
+		ret_val = SHELLMATTA_CONTINUE;
+		shellmatta_read(shell, &stdin_data, &stdin_len);
+		if (stdin_len > 0) {
+			for (i = 0; i < stdin_len; i++) {
+				if (stdin_data[i] == '\r') {
+					cal_state = CAL_MEAS_RES2;
+					ret_val = SHELLMATTA_BUSY;
+					shellmatta_printf(shell, "Measurement...\r\n");
+					adc_pt1000_clear_error();
+					data_buffer = calibration_acquire_data_start(512UL, &flag);
+					break;
+				} else if (stdin_data[i] == '\x03') {
+					cal_state = CAL_START;
+				}
+			}
+		}
+
+		break;
+	case CAL_MEAS_RES2:
+		if (!data_buffer) {
+			shellmatta_printf(shell, "Data acquisition failed!\r\n");
+			ret_val = SHELLMATTA_OK;
+			cal_state = CAL_START;
+			break;
+		}
+
+		res = calibration_poll_data_acquisition(data_buffer, 512UL, &flag, &mu2, &dev2);
+		/* Stay in this state until the measurements are finished */
+		if (res == 1) {
+			ret_val = SHELLMATTA_BUSY;
+			cal_state = CAL_MEAS_RES2;
+		} else if (res == 0) {
+			shellmatta_printf(shell, "R=%.2f, Noise peak-peak: %.2f\r\n", mu2, dev2);
+			if (adc_pt1000_check_error() != ADC_PT1000_NO_ERR) {
+				shellmatta_printf(shell, "Error in resistance measurement: %d", adc_pt1000_check_error());
+				ret_val = SHELLMATTA_OK;
+				cal_state = CAL_START;
+			} else {
+				ret_val = SHELLMATTA_OK;
+				cal_state = CAL_START;
+
+				if (dev > CALIBRATION_MAX_PEAK_PEAK_NOISE_OHM ||
+				    dev2 > CALIBRATION_MAX_PEAK_PEAK_NOISE_OHM) {
+					shellmatta_printf(shell, "Calibration failed! Too much noise. Check your hardware.\r\n");
+					break;
+				}
+				shellmatta_printf(shell, "Calibartion finished successfully!\r\n");
+				/* Calculate calibration */
+				calibration_calculate(mu, 1000.0f, mu2, 2000.0f, &sens_dev, &offset);
+
+				shellmatta_printf(shell, "\r\n\tSENS_DEVIATION: %.4f\r\n\tOFFSET_CORR: %.2f\r\n", sens_dev, offset);
+				adc_pt1000_set_resistance_calibration(offset, sens_dev, true);
+			}
+		} else {
+			shellmatta_printf(shell, "Error in resistance measurement: %d", adc_pt1000_check_error());
+			ret_val = SHELLMATTA_OK;
+			cal_state = CAL_START;
+		}
+		break;
+	default:
+		shellmatta_printf(shell, "Undefined state reached in calibration. Aborting\r\n");
+		cal_state = CAL_START;
+		ret_val = SHELLMATTA_OK;
+		break;
+	}
+
+	return ret_val;
 }

stm-firmware/create-c-file-with-header.py

@@ -2,6 +2,7 @@
 
 import os
 import sys
+import pathlib
 
 license_header = """/* Reflow Oven Controller
 *
@@ -22,7 +23,6 @@ license_header = """/* Reflow Oven Controller
 * along with the reflow oven controller project.
 * If not, see <http://www.gnu.org/licenses/>.
 */
-
 """
 
 project_dir = os.path.dirname(os.path.realpath(__file__))
@@ -37,19 +37,23 @@ cpath = os.path.join(project_dir, sys.argv[1]+'.c')
 hfile = sys.argv[1]+'.h'
 hpath = os.path.join(module_include_dir, hfile)
 
-h_define = '__'+hfile.replace('.', '_').replace('-', '_').upper()+'__'
+h_define = '__'+hfile.replace('.', '_').replace('-', '_').replace('/', '_').upper()+'__'
 
 if os.path.exists(cpath) or os.path.exists(hpath):
 	print("File already exists! Abort!")
 	sys.exit()
 
 print('Creating C file: %s' % (cpath))
+cfile_folder = os.path.dirname(cpath)
+pathlib.Path(cfile_folder).mkdir(parents=True, exist_ok=True)
 with open(cpath, 'x') as f:
 	f.write(license_header)
 	f.write('\n')
 	f.write('#include <%s>' % (os.path.join(include_prefix, hfile)))
 
 print('Creating H file: %s' % (hpath))
+hfile_folder = os.path.dirname(hpath)
+pathlib.Path(hfile_folder).mkdir(parents=True, exist_ok=True)
 with open(hpath, 'x') as f:
 	f.write(license_header)
 	f.write('\n')

stm-firmware/digio.c

@@ -27,6 +27,7 @@
 static const uint8_t digio_pins[] = {DIGIO_PINS};
 static const uint8_t digio_default_io[] = {DIGIO_INOUT_DEFAULT};
 static const uint8_t digio_default_altfunc[] = {DIGIO_ALTFUNC_DEFAULT};
+static uint16_t loudspeaker_val;
 
 static void digio_setup_pin_int(uint8_t bit_no, uint8_t in_out, uint8_t alt_func)
 {
@@ -118,6 +119,19 @@ int led_get(uint8_t num)
 	return ((LED_PORT->ODR & (1<<led_pins[num])) ? 1 : 0);
 }
 
+
+static void loudspeaker_freq_timer_init(void)
+{
+#if LOUDSPEAKER_MULTIFREQ
+	rcc_manager_enable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(RCC_APB1ENR_TIM7EN));
+	TIM7->CR1 = 0UL;
+	TIM7->CR2 = 0UL;
+	TIM7->PSC = 1000;
+	TIM7->DIER = TIM_DIER_UIE;
+	NVIC_EnableIRQ(TIM7_IRQn);
+#endif
+}
+
 void loudspeaker_setup()
 {
 	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(LOUDSPEAKER_RCC_MASK));
@@ -125,16 +139,56 @@ void loudspeaker_setup()
 	LOUDSPEAKER_PORT->MODER &= MODER_DELETE(LOUDSPEAKER_PIN);
 	LOUDSPEAKER_PORT->MODER |= OUTPUT(LOUDSPEAKER_PIN);
 
-	loudspeaker_set(0);
+	loudspeaker_freq_timer_init();
+	loudspeaker_set(0U);
 }
-void loudspeaker_set(int val)
+
+static void loudspeaker_start_beep(uint16_t val)
 {
-	if (val)
-		LOUDSPEAKER_PORT->ODR |= (1<<LOUDSPEAKER_PIN);
-	else
-		LOUDSPEAKER_PORT->ODR &= ~(1<<LOUDSPEAKER_PIN);
+#if LOUDSPEAKER_MULTIFREQ
+	TIM7->ARR = val;
+	TIM7->CNT = 0UL;
+	TIM7->CR1 |= TIM_CR1_CEN;
+#else
+	(void)val;
+	LOUDSPEAKER_PORT->ODR |= (1<<LOUDSPEAKER_PIN);
+#endif
 }
-int loudspeaker_get()
+
+static void loudspeaker_stop_beep(void)
 {
-	return ((LOUDSPEAKER_PORT->ODR & (1<<LOUDSPEAKER_PIN)) ? 1 : 0);
+#if LOUDSPEAKER_MULTIFREQ
+	TIM7->CR1 &= ~TIM_CR1_CEN;
+	__DSB();
+	TIM7->SR = 0UL;
+	__DSB();
+	LOUDSPEAKER_PORT->ODR &= ~(1<<LOUDSPEAKER_PIN);
+#else
+	LOUDSPEAKER_PORT->ODR &= ~(1<<LOUDSPEAKER_PIN);
+#endif
 }
+
+void loudspeaker_set(uint16_t val)
+{
+	loudspeaker_val = val;
+
+	if (!val) {
+		loudspeaker_stop_beep();
+	} else {
+		loudspeaker_start_beep(val);
+	}
+}
+
+uint16_t loudspeaker_get()
+{
+	return loudspeaker_val;
+}
+
+#if LOUDSPEAKER_MULTIFREQ
+void TIM7_IRQHandler(void)
+{
+	TIM7->SR = 0UL;
+	__DSB();
+	LOUDSPEAKER_PORT->ODR ^= (1<<LOUDSPEAKER_PIN);
+}
+#endif

stm-firmware/fatfs/shimatta_sdio_driver/shimatta_sdio.c

@@ -32,9 +32,9 @@ static struct sd_info card_info; // = {.type = CARD_NONE};
  * @brief checkNotInserted
  * @return return 0 if card is inserted, else 1
  */
-static int sdio_check_inserted() {
+int sdio_check_inserted() {
 #if SDIO_ENABLE_INS
-	return ((INS_PORT->IDR & INS_PIN) == (INS_ACTIVE_LEVEL<<INS_PIN) ? 0 : 1);
+	return ((INS_PORT->IDR & (1<<INS_PIN)) == (INS_ACTIVE_LEVEL<<INS_PIN) ? 0 : 1);
 #else
 	return 0; // Assume Card is inserted
 #endif
@@ -46,7 +46,7 @@ static int sdio_check_inserted() {
  */
 static int sdio_check_write_protection() {
 #if SDIO_ENABLE_WRITEPROT
-	return ((WRITEPROT_PORT->IDR & WRITEPROT_PIN) == (WRITEPROT_ACTIVE_LEVEL<<WRITEPROT_PIN) ? 1 : 0);
+	return ((WRITEPROT_PORT->IDR & (1<<WRITEPROT_PIN)) == (WRITEPROT_ACTIVE_LEVEL<<WRITEPROT_PIN) ? 1 : 0);
 #else
 	return 0; // Assume Card is not write protected
 #endif

stm-firmware/fatfs/shimatta_sdio_driver/shimatta_sdio.h

@@ -20,6 +20,8 @@ DRESULT sdio_disk_write(const BYTE *buff, DWORD sector, UINT count);
 DRESULT sdio_disk_ioctl(BYTE cmd, void* buff);
 DWORD get_fattime();
 
+int sdio_check_inserted();
+
 
 //Defines for Card Status in struct _CardStatus
 #define CURRENT_STATE_IDLE 0

stm-firmware/fatfs/shimatta_sdio_driver/shimatta_sdio_config.h

@@ -24,7 +24,7 @@
 
 /* Port Definitions */
 
-#define PORTCLKMASK (RCC_AHB1ENR_GPIODEN | RCC_AHB1ENR_GPIOCEN)
+#define PORTCLKMASK (RCC_AHB1ENR_GPIODEN | RCC_AHB1ENR_GPIOCEN | RCC_AHB1ENR_GPIOAEN)
 
 #define ALTFUNC     12
 
@@ -50,10 +50,10 @@
 #define WRITEPROT_ACTIVE_LEVEL 0
 
 // Card inserted pin
-#define SDIO_ENABLE_INS 0
-#define INS_PORT GPIOD // Add this port to port clock mask!
-#define INS_PIN 0
-#define INS_PULLUP 0
+#define SDIO_ENABLE_INS 1
+#define INS_PORT GPIOA // Add this port to port clock mask!
+#define INS_PIN 8
+#define INS_PULLUP 1
 #define INS_ACTIVE_LEVEL 0
 
 

stm-firmware/include/reflow-controller/adc-meas.h

@@ -24,6 +24,11 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include <stm32/stm32f4xx.h>
+
+/*If this is changed, change DMA code to fit the channel assignment! */
+#define ADC_PT1000_PERIPH ADC3
+#define ADC_PT1000_DMA2_STREAM0_CHANNEL 2
+
 /**
  * @brief Moving average filter coefficient for PT1000 measurement
  */
@@ -34,15 +39,35 @@
  */
 #define ADC_PT1000_CHANNEL 2U
 
+/**
+ * @brief GPIO Port the ADC converter for the PT1000 measurement is connected to
+ */
 #define ADC_PT1000_PORT GPIOA
+
+/**
+ * @brief The clock enable mask of the RCC register for ADC_PT1000_PORT
+ */
 #define ADC_PT1000_PORT_RCC_MASK RCC_AHB1ENR_GPIOAEN
 
+/**
+ * @brief The GPIO pin number the PT1000 analog voltage is connected to
+ */
 #define ADC_PT1000_PIN 2U
 
+/**
+ * @brief The cycle count the moving average filter is labeled 'instable' after startup of the measurement or changing
+ * the alpha value @ref ADC_PT1000_FILTER_WEIGHT
+ */
 #define ADC_FILTER_STARTUP_CYCLES 800U
 
+/**
+ * @brief The delay value programmed into the sample timer
+ */
 #define ADC_PT1000_SAMPLE_CNT_DELAY 1000U
 
+/**
+ * @brief The amount of samples to take to prefilter the analog signal
+ */
 #define ADC_PT1000_DMA_AVG_SAMPLES 6U
 
 /**
@@ -59,6 +84,12 @@
  */
 #define ADC_PT1000_UPPER_WATCHDOG 4000U
 
+/**
+ * @brief Number of ADC samples the value has to be outside the Watchdog limit (@ref ADC_PT1000_UPPER_WATCHDOG and @ref ADC_PT1000_LOWER_WATCHDOG)
+ * in order to produce a watchdog error
+ */
+#define ADC_PT1000_WATCHDOG_SAMPLE_COUNT 25U
+
 enum adc_pt1000_error {ADC_PT1000_NO_ERR= 0, ADC_PT1000_WATCHDOG_ERROR=(1UL<<0), ADC_PT1000_OVERFLOW=(1UL<<1), ADC_PT1000_INACTIVE = (1UL<<2)};
 
 /**
@@ -107,7 +138,7 @@ void adc_pt1000_get_resistance_calibration(float *offset, float *sensitivity_dev
 /**
  * @brief Get the current reistance value
  *
- * If the reistance calibration is enabled, this function applies the calculations of the raw reistance reading and
+ * If the reistance calibration is enabled, this function applies the calculations of the raw resistance reading and
  * returns the corrected value.
  *
  * If an ADC error is set, the status is negative. The status is 2 during the first measurements with a given filter setting. Technically, the resistance value is
@@ -138,8 +169,14 @@ void adc_pt1000_convert_raw_value_array_to_resistance(float *resistance_dest, fl
  */
 enum adc_pt1000_error adc_pt1000_check_error();
 
+/**
+ * @brief Clear the error status of the PT1000 measurement
+ */
 void adc_pt1000_clear_error();
 
+/**
+ * @brief Disable the PT1000 measurement
+ */
 void adc_pt1000_disable();
 
 #endif // __ADCMEAS_H__

stm-firmware/include/reflow-controller/button.h

@@ -0,0 +1,76 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __BUTTON_H__
+#define __BUTTON_H__
+
+/**
+ * @brief GPIO Port the button is connected to
+ */
+#define BUTTON_PORT GPIOD
+
+/**
+ * @brief The RCC clock mask for @ref BUTTON_PORT
+ */
+#define BUTTON_RCC_MASK RCC_AHB1ENR_GPIODEN
+
+/**
+ * @brief The GPIO pin number the button is connected to
+ */
+#define BUTTON_PIN 4
+
+/**
+ * @brief The time in ms the button has to stay pressed to be detected as a short press
+ */
+#define BUTTON_SHORT_ON_TIME_MS 50UL
+
+/**
+ * @brief Time in ms the button has to be pressed to be counted as a long press
+ */
+#define BUTTON_LONG_ON_TIME_MS 400UL
+
+
+#if BUTTON_LONG_ON_TIME_MS <= BUTTON_SHORT_ON_TIME_MS
+#error "Button BUTTON_SHORT_ON_TIME_MS time has to be shorter than BUTTON_LONG_ON_TIME_MS"
+#endif
+
+/**
+ * @brief States the puhsbutton of the rotary encoder can be in
+ */
+enum button_state {BUTTON_IDLE = 0, BUTTON_SHORT_RELEASED, BUTTON_LONG_RELEASED, BUTTON_SHORT, BUTTON_LONG};
+
+/**
+ * @brief Init the push button
+ */
+void button_init();
+
+/**
+ * @brief read if a push button event occured
+ * @return Button event
+ */
+enum button_state button_read_event();
+
+/**
+ * @brief button_deinit
+ */
+void button_deinit();
+
+
+#endif /* __BUTTON_H__ */

stm-firmware/include/reflow-controller/calibration.h

@@ -29,8 +29,8 @@
 void calibration_calculate(float low_measured, float low_setpoint, float high_measured, float high_setpoint,
 			   float *sens_deviation, float *sens_corrected_offset);
 
-int calibration_acquire_data(float *mu, float *max_dev, uint32_t count);
+float *calibration_acquire_data_start(uint32_t count, volatile int *flag);
 
-int calibration_sequence_shell_cmd(shellmatta_handle_t shell);
+shellmatta_retCode_t calibration_sequence_shell_cmd(shellmatta_handle_t shell, const char *arg, uint32_t len);
 
 #endif /* __CALIBRATION_H__ */

stm-firmware/include/reflow-controller/digio.h

@@ -58,10 +58,11 @@ int led_get(uint8_t num);
 #define LOUDSPEAKER_PORT GPIOB
 #define LOUDSPEAKER_RCC_MASK RCC_AHB1ENR_GPIOBEN
 #define LOUDSPEAKER_PIN 1
+#define LOUDSPEAKER_MULTIFREQ 1
 
 void loudspeaker_setup();
-void loudspeaker_set(int val);
-int loudspeaker_get();
+void loudspeaker_set(uint16_t val);
+uint16_t loudspeaker_get();
 
 
 #endif /* __DIGIO_H__ */

stm-firmware/include/reflow-controller/oven-driver.h

@@ -0,0 +1,73 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __OVEN_DRIVER_H__
+#define __OVEN_DRIVER_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <reflow-controller/pid-controller.h>
+
+enum oven_pid_error_report {
+	OVEN_PID_NO_ERROR = 0,
+	OVEN_PID_ERR_PT1000_ADC_WATCHDOG = (1<<0),
+	OVEN_PID_ERR_PT1000_ADC_OFF = (1<<1),
+	OVEN_PID_ERR_PT1000_OTHER = (1<<2),
+	OVEN_PID_ERR_VREF_TOL = (1<<3),
+	OVEN_PID_ERR_OVERTEMP = (1<<4),
+};
+
+struct oven_pid_errors {
+	bool generic_error;
+	bool pt1000_adc_watchdog;
+	bool pt1000_adc_off;
+	bool pt1000_other;
+	bool vref_tol;
+	bool controller_overtemp;
+};
+
+struct oven_pid_status {
+	bool active;
+	bool error_set;
+	struct oven_pid_errors error_flags;
+	float target_temp;
+	float current_temp;
+	uint64_t timestamp_last_run;
+};
+
+void oven_driver_init(void);
+
+void oven_driver_set_power(uint8_t power);
+
+void oven_driver_disable(void);
+
+void oven_pid_ack_errors(void);
+
+void oven_pid_init(struct pid_controller *controller_to_copy);
+
+void oven_pid_handle(float target_temp);
+
+void oven_pid_stop();
+
+void oven_pid_report_error(enum oven_pid_error_report report);
+
+const struct oven_pid_status *oven_pid_get_status(void);
+
+#endif /* __OVEN_DRIVER_H__ */

stm-firmware/include/reflow-controller/periph-config/oven-driver-hwcfg.h

@@ -0,0 +1,33 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __OVEN_DRIVER_HWCFG_H__
+#define __OVEN_DRIVER_HWCFG_H__
+
+#include <stm32/stm32f4xx.h>
+
+#define OVEN_CONTROLLER_PWM_TIMER TIM3
+#define OVEN_CONTROLLER_PORT GPIOB
+#define OVEN_CONTROLLER_PIN (0)
+#define OVEN_CONTROLLER_PORT_RCC_MASK RCC_AHB1ENR_GPIOBEN
+#define OVEN_CONTROLLER_TIM_RCC_MASK RCC_APB1ENR_TIM3EN
+#define OVEN_CONTROLLER_PIN_ALTFUNC (2)
+
+#endif /* __OVEN_DRIVER_HWCFG_H__ */

stm-firmware/include/reflow-controller/periph-config/safety-adc-hwcfg.h

@@ -0,0 +1,38 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __SAFETY_ADC_HWCFG_H__
+#define __SAFETY_ADC_HWCFG_H__
+
+#include <stm32/stm32f4xx.h>
+
+#define SAFETY_ADC_ADC_PERIPHERAL ADC1
+#define SAFETY_ADC_ADC_RCC_MASK RCC_APB2ENR_ADC1EN
+#define TEMP_CHANNEL_NUM (16)
+#define INT_REF_CHANNEL_NUM (17)
+
+#define SAFETY_ADC_INT_REF_MV 1210.0f
+
+#define SAFETY_ADC_TEMP_NOM 25.0f
+#define SAFETY_ADC_TEMP_NOM_MV 760.0f
+#define SAFETY_ADC_TEMP_MV_SLOPE 2.5f
+
+
+#endif /* __SAFETY_ADC_HWCFG_H__ */

stm-firmware/include/reflow-controller/pid-controller.h

@@ -0,0 +1,50 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __PID_CONTROLLER_H__
+#define __PID_CONTROLLER_H__
+
+struct pid_controller {
+	float k_deriv;
+	float k_int;
+	float k_p;
+	float k_int_t;
+	float k_deriv_t;
+	float output_sat_max;
+	float output_sat_min;
+	float integral_max;
+	float sample_period;
+	volatile float control_output;
+	volatile float last_in;
+	volatile float integral;
+	volatile float derivate;
+};
+
+void pid_init(struct pid_controller *pid, float k_deriv, float k_int, float k_p, float output_sat_min, float output_sat_max, float integral_max, float sample_period);
+
+void pid_zero(struct pid_controller *pid);
+
+float pid_sample(struct pid_controller *pid, float deviation);
+
+float pid_get_control_output(const struct pid_controller *pid);
+
+int pid_copy(struct pid_controller *dest, const struct pid_controller *src);
+
+#endif /* __PID_CONTROLLER_H__ */

stm-firmware/include/reflow-controller/reflow-menu.h

@@ -0,0 +1,32 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __REFLOW_MENU_H__
+#define __REFLOW_MENU_H__
+
+/**
+ * @brief Handle the reflow controller's LCD Menu
+ * @return 0 if no delay is requested, 1 if delay is requested
+ */
+int reflow_menu_handle(void);
+
+void reflow_menu_init(void);
+
+#endif /* __REFLOW_MENU_H__ */

stm-firmware/include/reflow-controller/rotary-encoder.h

@@ -39,4 +39,6 @@ int32_t rotary_encoder_get_change_val(void);
 
 void rotary_encoder_stop(void);
 
+void rotary_encoder_zero(void);
+
 #endif /* __ROTARY_ENCODER_H__ */

stm-firmware/include/reflow-controller/safety-adc.h

@@ -0,0 +1,70 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __SAFETY_ADC_H__
+#define __SAFETY_ADC_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define SAFETY_ADC_VREF_MVOLT (2500.0f)
+#define SAFETY_ADC_VREF_TOL_MVOLT (100.0f)
+#define SAFETY_ADC_TEMP_LOW_LIM (0.0f)
+#define SAFETY_ADC_TEMP_HIGH_LIM (65.0f)
+
+enum safety_adc_meas_channel {SAFETY_ADC_MEAS_VREF, SAFETY_ADC_MEAS_TEMP};
+enum safety_adc_check_result {
+				SAFETY_ADC_CHECK_OK = 0UL,
+				SAFETY_ADC_CHECK_VREF_LOW = (1U<<0),
+				SAFETY_ADC_CHECK_VREF_HIGH = (1U<<1),
+				SAFETY_ADC_CHECK_TEMP_LOW = (1U<<2),
+				SAFETY_ADC_CHECK_TEMP_HIGH = (1U<<3),
+				SAFETY_ADC_INTERNAL_ERROR = (1U<<4),
+				};
+
+extern enum safety_adc_check_result global_safety_adc_status;
+
+enum safety_adc_check_result safety_adc_get_errors();
+
+void safety_adc_clear_errors(void);
+
+void safety_adc_init();
+
+void safety_adc_deinit();
+
+void safety_adc_trigger_meas(enum safety_adc_meas_channel measurement);
+
+/**
+ * @brief Poll ADC result.
+ * @param results adc results
+ * @return 1 if measurement successful, 0 if not ready, -1 if ADC aborted or not started
+ */
+int safety_adc_poll_result(uint16_t *adc_result);
+
+enum safety_adc_check_result safety_adc_check_results(uint16_t vref_result, uint16_t temp_result,
+						      float *vref_calculated, float *temp_calculated);
+
+enum safety_adc_check_result handle_safety_adc();
+
+float safety_adc_get_temp();
+
+float safety_adc_get_vref();
+
+#endif /* __SAFETY_ADC_H__ */

stm-firmware/include/reflow-controller/settings/settings-sd-card.h

@@ -0,0 +1,24 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __SETTINGS_SETTINGS_SD_CARD_H__
+#define __SETTINGS_SETTINGS_SD_CARD_H__
+
+#endif /* __SETTINGS_SETTINGS_SD_CARD_H__ */

stm-firmware/include/reflow-controller/settings/settings.h

@@ -0,0 +1,27 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#ifndef __SETTINGS_SETTINGS_H__
+#define __SETTINGS_SETTINGS_H__
+
+int settings_save_calibration();
+
+#endif /* __SETTINGS_SETTINGS_H__ */

stm-firmware/include/reflow-controller/shell.h

@@ -30,4 +30,6 @@ void shell_handle_input(shellmatta_handle_t shell, const char *data, size_t len)
 
 void shell_print_string(shellmatta_handle_t shell, const char *string);
 
+void shell_print_motd(shellmatta_handle_t shell);
+
 #endif /* __SHELL_H__ */

stm-firmware/include/reflow-controller/stack-check.h

@@ -29,6 +29,18 @@ int32_t stack_check_get_usage();
 
 int32_t stack_check_get_free();
 
+static inline int stack_check_collision()
+{
+	int ret = 0;
+	int32_t free_space = stack_check_get_free();
+
+	if ((unsigned int)free_space < STACK_CHECK_MIN_HEAP_GAP) {
+			ret = -1;
+	}
+
+	return ret;
+}
+
 static inline uint32_t read_stack_pointer()
 {
 	uint32_t stack_pointer;

stm-firmware/include/reflow-controller/systick.h

@@ -26,14 +26,15 @@
 #define __SYSTICK_H__
 
 #include <stdint.h>
+#include <stdbool.h>
 
 /**
  * @brief Reload value for the systick timer.
  *
  * This value has to be configured to set the systick to a one milliscond tick interval
- * The default value is 168000, which results in a 1ms tick for 168 MHz CPU speed
+ * The default value is 16800, which results in a 100us tick for 168 MHz CPU speed
  */
-#define SYSTICK_RELOAD (168000UL)
+#define SYSTICK_RELOAD (16800UL)
 
 /**
  * @brief Variable used by the systick_wait_ms function
@@ -44,10 +45,15 @@ extern volatile uint32_t wait_tick_ms;
  * @brief Systemclock in milliseconds.
  *
  * This value must not be reset during the whole runtime.
- *
+ * @warning In order to use this, you must assure that the read access is atomic.
  */
 extern volatile uint64_t global_tick_ms;
 
+/**
+ * @brief Wait counter for the display. This must not be used anywhere else
+ */
+extern volatile uint32_t lcd_tick_100us;
+
 /**
  * @brief Setup the Systick timer to generate a 1 ms tick
  */
@@ -65,4 +71,8 @@ void systick_wait_ms(uint32_t ms);
 
 uint64_t systick_get_global_tick();
 
+void systick_get_uptime_from_tick(uint32_t *days, uint32_t *hours, uint32_t *minutes, uint32_t *seconds);
+
+bool systick_ticks_have_passed(uint64_t start_timestamp, uint64_t ticks);
+
 #endif /* __SYSTICK_H__ */

stm-firmware/include/reflow-controller/temp-converter-data.h

@@ -8,7 +8,7 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
- * GDSII-Converter is distributed in the hope that it will be useful,
+ * The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.

stm-firmware/include/reflow-controller/ui/lcd.h

@@ -0,0 +1,53 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __LCD_H__
+#define __LCD_H__
+
+#define LCD_DPORT		(GPIOD)
+#define LCD_RCC_MASK		RCC_AHB1ENR_GPIODEN
+#define LCD_DATA_BIT_OFFSET	(8)
+#define LCD_RS			(6)
+#define LCD_E			(7)
+
+#define LCD_DATA_MASK		(0xFU << LCD_DATA_BIT_OFFSET)
+#define	LCD_RS_MASK		(1U << LCD_RS)
+#define	LCD_E_MASK		(1U << LCD_E)
+
+
+
+#define LCD_CHAR_WIDTH 16
+#define LCD_ROW_COUNT 4
+
+#define LCD_SHIMATTA_STRING "\xBC\xCF\xAF\xC0"
+#define LCD_DEGREE_SYMBOL_STRING "\xDF"
+#define LCD_DEGREE_SYMBOL_CHAR '\xDF'
+
+enum lcd_fsm_ret {LCD_FSM_NOP, LCD_FSM_CALL_AGAIN, LCD_FSM_WAIT_CALL};
+
+void lcd_init(void);
+
+void lcd_string(const char *data);
+
+void lcd_home(void);
+
+enum lcd_fsm_ret lcd_fsm_write_buffer(const char (*display_buffer)[21]);
+
+#endif /* __LCD_H__ */

stm-firmware/include/reflow-controller/ui/menu.h

@@ -0,0 +1,87 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __MENU_H__
+#define __MENU_H__
+
+#include <stdint.h>
+#include <reflow-controller/button.h>
+#include <stdbool.h>
+
+struct lcd_menu;
+
+enum menu_entry_func_entry {MENU_ENTRY_FIRST_ENTER, MENU_ENTRY_CONTINUE, MENU_ENTRY_DROPBACK};
+
+typedef void (*menu_func_t)(struct lcd_menu *menu, enum menu_entry_func_entry entry_type,
+					    void *parent);
+
+struct menu_inputs {
+	int16_t rotary_encoder_delta;
+	enum button_state push_button;
+};
+
+struct lcd_menu {
+	menu_func_t active_entry;
+	menu_func_t root_entry;
+	enum menu_entry_func_entry active_entry_type;
+	menu_func_t init_parent;
+	struct menu_inputs inputs;
+	void (*update_display)(uint8_t row, const char *data);
+};
+
+struct menu_list {
+	void (*update_display)(uint8_t row, const char *data);
+	const char * const * entry_names;
+	uint32_t entry_count;
+	uint32_t currently_selected;
+	const menu_func_t *submenu_list;
+};
+
+void menu_handle(struct lcd_menu *menu, int16_t rotary_encoder_delta, enum button_state push_button);
+
+void menu_init(struct lcd_menu *menu, menu_func_t root_node, void (*display_update)(uint8_t row, const char *data));
+
+void menu_ack_rotary_delta(struct lcd_menu *menu);
+
+void menu_display_clear(struct lcd_menu *menu);
+
+void menu_entry_dropback(struct lcd_menu *menu, menu_func_t parent_func);
+
+void menu_entry_enter(struct lcd_menu *menu, menu_func_t entry, bool handle_immediately);
+
+void menu_lcd_output(struct lcd_menu *menu, uint8_t row_num, const char *text);
+
+void menu_lcd_outputf(struct lcd_menu *menu, uint8_t row_num, const char *format, ...);
+
+void menu_list_display(struct menu_list *list, uint32_t top_row, uint32_t bottom_row);
+
+int16_t menu_get_rotary_delta(const struct lcd_menu *menu);
+
+enum button_state menu_get_button_state(const struct lcd_menu *menu);
+
+void menu_list_compute_count(struct menu_list *list);
+
+void menu_list_scroll_down(struct menu_list *list);
+
+void menu_list_scroll_up(struct menu_list *list);
+
+void menu_list_enter_selected_entry(struct menu_list *list, struct lcd_menu *menu);
+
+#endif /* __MENU_H__ */

stm-firmware/include/stm-periph/stm32-gpio-macros.h

@@ -21,13 +21,15 @@
 #ifndef __STM32GPIOMACROS_H__
 #define __STM32GPIOMACROS_H__
 
-#define MODER_DELETE(pin) ~(0x3U << (pin * 2))
-#define OUTPUT(pin)  (0x01U << (pin * 2))
-#define PULLUP(pin) (0x1U << (pin* 2))
-#define ALTFUNC(pin) ((0x2) << (pin * 2))
-#define PINMASK(pin) ((0x3) << (pin * 2))
-#define SETAF(PORT,PIN,AF)  PORT->AFR[(PIN < 8 ? 0 : 1)] |= AF << ((PIN < 8 ? PIN : (PIN - 8)) * 4)
-#define ANALOG(pin)  (0x03 << (pin * 2))
+#define MODER_DELETE(pin) ~(0x3U << ((pin) * 2))
+#define PUPDR_DELETE(pin) ~(0x3U << ((pin) * 2))
+#define OUTPUT(pin)  (0x01U << ((pin) * 2))
+#define PULLUP(pin) (0x1U << ((pin)* 2))
+#define PULLDOWN(pin) (0x2U << ((pin)* 2))
+#define ALTFUNC(pin) ((0x2) << ((pin) * 2))
+#define PINMASK(pin) ((0x3) << ((pin) * 2))
+#define SETAF(PORT,PIN,AF)  PORT->AFR[((PIN) < 8 ? 0 : 1)] |= (AF) << (((PIN) < 8 ? (PIN) : ((PIN) - 8)) * 4)
+#define ANALOG(pin)  (0x03 << ((pin) * 2))
 #define OTYP_OPENDRAIN(pin) (0x1U << (pin))
 
 #define BITMASK_TO_BITNO(x) (x&0x1?0:x&0x2?1:x&0x4?2:x&0x8?3: \

stm-firmware/main.c

@@ -24,7 +24,9 @@
  */
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
+#include <inttypes.h>
 /* #include <arm_math.h> */
 #include <stm32/stm32f4xx.h>
 #include <cmsis/core_cm4.h>
@@ -33,15 +35,19 @@
 #include <reflow-controller/adc-meas.h>
 #include <reflow-controller/shell.h>
 #include <reflow-controller/digio.h>
-#include <reflow-controller/rotary-encoder.h>
+#include "fatfs/shimatta_sdio_driver/shimatta_sdio.h"
 #include <stm-periph/stm32-gpio-macros.h>
 #include <stm-periph/clock-enable-manager.h>
 #include <stm-periph/uart.h>
 #include <reflow-controller/shell-uart-config.h>
-#include <helper-macros/helper-macros.h>
+#include <reflow-controller/oven-driver.h>
+#include <reflow-controller/safety-adc.h>
 #include <fatfs/ff.h>
+#include <reflow-controller/reflow-menu.h>
 
-static void setup_nvic_priorities()
+bool global_error_state;
+
+static void setup_nvic_priorities(void)
 {
 	/* No sub priorities */
 	NVIC_SetPriorityGrouping(2);
@@ -52,14 +58,16 @@ static void setup_nvic_priorities()
 	NVIC_SetPriority(DMA2_Stream7_IRQn, 3);
 }
 
-static float pt1000_value;
-static volatile int pt1000_value_status;
-static uint32_t rot;
+FATFS fs;
+FATFS * const fs_ptr = &fs;
 
-
-
-static inline void uart_gpio_config()
+static inline void uart_gpio_config(void)
 {
+	/*
+	 * In case the application is build in debug mode, use the TX/RX Pins on the debug header
+	 * else the Pins on the DIGIO header are configured in the digio module
+	 */
+
 #ifdef DEBUGBUILD
 	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(SHELL_UART_PORT_RCC_MASK));
 	SHELL_UART_PORT->MODER &=  MODER_DELETE(SHELL_UART_TX_PIN) & MODER_DELETE(SHELL_UART_RX_PIN);
@@ -71,7 +79,7 @@ static inline void uart_gpio_config()
 
 
 static char shell_uart_tx_buff[128];
-static char shell_uart_rx_buff[32];
+static char shell_uart_rx_buff[48];
 struct stm_uart shell_uart;
 
 static shellmatta_retCode_t write_shell_callback(const char *data, uint32_t len)
@@ -80,7 +88,7 @@ static shellmatta_retCode_t write_shell_callback(const char *data, uint32_t len)
 	return SHELLMATTA_OK;
 }
 
-static inline void setup_sell_uart(struct stm_uart *uart)
+static inline void setup_shell_uart(struct stm_uart *uart)
 {
 	uart->rx = 1;
 	uart->tx = 1;
@@ -102,47 +110,156 @@ static inline void setup_sell_uart(struct stm_uart *uart)
 	NVIC_EnableIRQ(DMA2_Stream7_IRQn);
 }
 
-const char *oven_controller_hello_world = "Hello world :)\n";
-
-int main()
+static bool mount_sd_card_if_avail(bool mounted)
 {
-	FATFS fs;
-	FIL test_file;
-	const char *uart_input;
-	size_t uart_input_len;
-	shellmatta_handle_t shell_handle;
-	int uart_receive_status;
+	FRESULT res;
 
+	if (sdio_check_inserted() && mounted) {
+		memset(fs_ptr, 0, sizeof(FATFS));
+		return false;
+	}
+
+	if (!sdio_check_inserted() && !mounted) {
+		res = f_mount(fs_ptr, "0:/", 1);
+		if (res == FR_OK)
+			return true;
+		else
+			return false;
+	}
+
+	return mounted;
+}
+
+static void setup_unused_pins(void)
+{
+	int i;
+
+	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(RCC_AHB1ENR_GPIOEEN));
+	GPIOE->MODER = 0UL;
+	for (i = 0; i < 16; i++)
+		GPIOE->PUPDR |= PULLDOWN(i);
+}
+
+static inline void setup_system(void)
+{
 	setup_nvic_priorities();
 	systick_setup();
 
 	adc_pt1000_setup_meas();
-
+	oven_driver_init();
 	digio_setup_default_all();
 	led_setup();
 	loudspeaker_setup();
-	rotary_encoder_setup();
+	reflow_menu_init();
+	safety_adc_init();
 
 	uart_gpio_config();
-	setup_sell_uart(&shell_uart);
+	setup_shell_uart(&shell_uart);
+
+	setup_unused_pins();
+}
+
+static void handle_shell_uart_input(shellmatta_handle_t shell_handle)
+{
+	int uart_receive_status;
+	const char *uart_input;
+	size_t uart_input_len;
+
+	/* Handle UART input for shell */
+	uart_receive_status = uart_receive_data_with_dma(&shell_uart, &uart_input, &uart_input_len);
+	if (uart_receive_status >= 0)
+		shell_handle_input(shell_handle, uart_input, uart_input_len);
+}
+
+static void zero_ccm_ram(void)
+{
+	/* These extern variables are placed in the linker script */
+	extern char _sccmram;
+	extern char _eccmram;
+	uint32_t len;
+	uint32_t i;
+	uint32_t *ptr = (uint32_t *)&_sccmram;
+
+	len = (uint32_t)&_eccmram - (uint32_t)&_sccmram;
+	for (i = 0; i < len; i++)
+		ptr[i] = 0UL;
+}
+
+/**
+ * @brief This function sets the appropriate error flags in the oven PID controller
+ * depending on the Safety ADC measurements.
+ * The PID controller's error flags have to be cleared via the GUI by either starting a new RUN or explicitly
+ * ack'ing these errors.
+ */
+static void propagate_safety_adc_error_to_oven_pid(void)
+{
+	enum safety_adc_check_result safety_adc_result;
+
+	safety_adc_result = safety_adc_get_errors();
+
+	if (safety_adc_result & SAFETY_ADC_CHECK_TEMP_LOW ||
+	    safety_adc_result & SAFETY_ADC_CHECK_TEMP_HIGH)
+		oven_pid_report_error(OVEN_PID_ERR_OVERTEMP);
+
+	if (safety_adc_result & SAFETY_ADC_CHECK_VREF_LOW ||
+	    safety_adc_result & SAFETY_ADC_CHECK_VREF_HIGH)
+		oven_pid_report_error(OVEN_PID_ERR_VREF_TOL);
+
+	if (safety_adc_result & SAFETY_ADC_INTERNAL_ERROR)
+		oven_pid_report_error(0);
+}
+
+int main(void)
+{
+	bool sd_card_mounted = false;
+	shellmatta_handle_t shell_handle;
+	int menu_wait_request;
+	uint64_t quarter_sec_timestamp = 0ULL;
+	const struct oven_pid_status *pid_status;
+	enum adc_pt1000_error pt1000_status;
+
+	zero_ccm_ram();
+	setup_system();
+
+	global_error_state = false;
 
 	shell_handle = shell_init(write_shell_callback);
-
-	if (f_mount(&fs, "0:/", 1) == FR_OK) {
-		f_open(&test_file, "hello-world.txt", FA_OPEN_APPEND | FA_WRITE);
-		f_write(&test_file, oven_controller_hello_world, strlen(oven_controller_hello_world), NULL);
-		f_close(&test_file);
-	}
-
+	shell_print_motd(shell_handle);
 
 	while (1) {
-		pt1000_value_status = adc_pt1000_get_current_resistance(&pt1000_value);
-		rot = rotary_encoder_get_abs_val();
-		uart_receive_status = uart_receive_data_with_dma(&shell_uart, &uart_input, &uart_input_len);
-		if (uart_receive_status >= 1)
-			shell_handle_input(shell_handle, uart_input, uart_input_len);
+		sd_card_mounted = mount_sd_card_if_avail(sd_card_mounted);
+
+		pid_status = oven_pid_get_status();
+
+		if (systick_ticks_have_passed(quarter_sec_timestamp, 250)) {
+			quarter_sec_timestamp = systick_get_global_tick();
+
+			(void)handle_safety_adc();
+			propagate_safety_adc_error_to_oven_pid();
+
+			if (global_error_state)
+				led_set(0, !led_get(0));
+			else
+				led_set(0, 0);
+		}
+
+		pt1000_status = adc_pt1000_check_error();
+		global_error_state = pid_status->error_set || !!safety_adc_get_errors() || !!pt1000_status;
+
+		menu_wait_request = reflow_menu_handle();
+
+		/* Deactivate oven output in case of error! */
+		if (!pid_status->active || global_error_state)
+			oven_driver_set_power(0U);
+
+		handle_shell_uart_input(shell_handle);
+
+		if (menu_wait_request)
+			__WFI();
+
 	}
 
+	return 0;
 }
 
 void sdio_wait_ms(uint32_t ms)
@@ -150,12 +267,12 @@ void sdio_wait_ms(uint32_t ms)
 	systick_wait_ms(ms);
 }
 
-void DMA2_Stream7_IRQHandler()
+void DMA2_Stream7_IRQHandler(void)
 {
 	uint32_t hisr = DMA2->HISR;
+
 	DMA2->HIFCR = hisr;
 
-	if (hisr & DMA_HISR_TCIF7) {
+	if (hisr & DMA_HISR_TCIF7)
 		uart_tx_dma_complete_int_callback(&shell_uart);
-	}
 }

stm-firmware/oven-driver.c

@@ -0,0 +1,163 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <reflow-controller/oven-driver.h>
+#include <reflow-controller/periph-config/oven-driver-hwcfg.h>
+#include <stm-periph/clock-enable-manager.h>
+#include <reflow-controller/systick.h>
+#include <reflow-controller/adc-meas.h>
+#include <reflow-controller/temp-converter.h>
+
+static struct pid_controller oven_pid;
+
+static struct oven_pid_status oven_pid_current_status = {
+	.active = false,
+	.error_set = false,
+	.target_temp = 0.0f,
+	.current_temp = 0.0f,
+	.timestamp_last_run = 0ULL
+};
+
+void oven_driver_init()
+{
+	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(OVEN_CONTROLLER_PORT_RCC_MASK));
+	rcc_manager_enable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(OVEN_CONTROLLER_TIM_RCC_MASK));
+
+	OVEN_CONTROLLER_PORT->MODER &= MODER_DELETE(OVEN_CONTROLLER_PIN);
+	OVEN_CONTROLLER_PORT->MODER |= ALTFUNC(OVEN_CONTROLLER_PIN);
+	SETAF(OVEN_CONTROLLER_PORT, OVEN_CONTROLLER_PIN, OVEN_CONTROLLER_PIN_ALTFUNC);
+
+	OVEN_CONTROLLER_PWM_TIMER->CR2 = 0UL;
+
+	OVEN_CONTROLLER_PWM_TIMER->CCMR2 = TIM_CCMR2_OC3M;
+	OVEN_CONTROLLER_PWM_TIMER->CCER = TIM_CCER_CC3E | TIM_CCER_CC3P;
+
+	OVEN_CONTROLLER_PWM_TIMER->ARR = 1000U;
+	OVEN_CONTROLLER_PWM_TIMER->PSC = 42000U - 1U;
+
+	OVEN_CONTROLLER_PWM_TIMER->CR1 = TIM_CR1_CMS | TIM_CR1_CEN;
+}
+
+void oven_driver_set_power(uint8_t power)
+{
+	if (power > 100U)
+		power = 100U;
+
+	OVEN_CONTROLLER_PWM_TIMER->CCR3 = power * 10;
+}
+
+void oven_driver_disable()
+{
+	OVEN_CONTROLLER_PWM_TIMER->CR1 = 0UL;
+	OVEN_CONTROLLER_PWM_TIMER->CR2 = 0UL;
+	rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(OVEN_CONTROLLER_PORT_RCC_MASK));
+	rcc_manager_disable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(OVEN_CONTROLLER_TIM_RCC_MASK));
+}
+
+void oven_pid_ack_errors(void)
+{
+	oven_pid_current_status.error_set = false;
+	oven_pid_current_status.error_flags.vref_tol = false;
+	oven_pid_current_status.error_flags.pt1000_other = false;
+	oven_pid_current_status.error_flags.generic_error = false;
+	oven_pid_current_status.error_flags.pt1000_adc_off = false;
+	oven_pid_current_status.error_flags.controller_overtemp = false;
+	oven_pid_current_status.error_flags.pt1000_adc_watchdog = false;
+}
+
+void oven_pid_init(struct pid_controller *controller_to_copy)
+{
+	pid_copy(&oven_pid, controller_to_copy);
+	oven_pid.output_sat_min = 0.0f;
+	oven_pid.output_sat_max = 100.0f;
+	oven_pid_current_status.timestamp_last_run = 0ULL;
+	oven_pid_current_status.active = true;
+	oven_pid_ack_errors();
+}
+
+void oven_pid_handle(float target_temp)
+{
+	float pid_out;
+	float current_temp;
+	int resistance_status;
+	enum adc_pt1000_error pt1000_error;
+
+	if (oven_pid_current_status.active && !oven_pid_current_status.error_set) {
+		if (systick_ticks_have_passed(oven_pid_current_status.timestamp_last_run,
+					      (uint64_t)(oven_pid.sample_period * 1000))) {
+
+			resistance_status = adc_pt1000_get_current_resistance(&current_temp);
+			if (resistance_status < 0) {
+				oven_driver_set_power(0);
+				pt1000_error = adc_pt1000_check_error();
+				if (pt1000_error & ADC_PT1000_WATCHDOG_ERROR)
+					oven_pid_report_error(OVEN_PID_ERR_PT1000_ADC_WATCHDOG);
+				if (pt1000_error & ADC_PT1000_INACTIVE)
+					oven_pid_report_error(OVEN_PID_ERR_PT1000_ADC_OFF);
+				if (pt1000_error & ADC_PT1000_OVERFLOW)
+					oven_pid_report_error(OVEN_PID_ERR_PT1000_OTHER);
+
+				return;
+			}
+
+			(void)temp_converter_convert_resistance_to_temp(current_temp, &current_temp);
+
+			pid_out = pid_sample(&oven_pid, target_temp - current_temp);
+			oven_driver_set_power((uint8_t)pid_out);
+			oven_pid_current_status.timestamp_last_run = systick_get_global_tick();
+			oven_pid_current_status.target_temp = target_temp;
+			oven_pid_current_status.current_temp = current_temp;
+		}
+	}
+}
+
+void oven_pid_report_error(enum oven_pid_error_report report)
+{
+	struct oven_pid_errors *e = &oven_pid_current_status.error_flags;
+
+	oven_pid_current_status.active = false;
+	oven_pid_current_status.error_set = true;
+
+	if (report == 0) {
+		e->generic_error = true;
+	}
+	if (report & OVEN_PID_ERR_OVERTEMP)
+		e->controller_overtemp = true;
+	if (report & OVEN_PID_ERR_VREF_TOL)
+		e->controller_overtemp = true;
+	if (report & OVEN_PID_ERR_PT1000_OTHER)
+		e->pt1000_other = true;
+	if (report & OVEN_PID_ERR_PT1000_ADC_OFF)
+		e->pt1000_adc_off = true;
+	if (report & OVEN_PID_ERR_PT1000_ADC_WATCHDOG)
+		e->pt1000_adc_watchdog = true;
+}
+
+const struct oven_pid_status *oven_pid_get_status()
+{
+	return &oven_pid_current_status;
+}
+
+void oven_pid_stop()
+{
+	oven_pid_current_status.active = false;
+	oven_pid_current_status.target_temp = 0.0f;
+	oven_pid_current_status.current_temp = 0.0f;
+}

stm-firmware/pid-controller.c

@@ -0,0 +1,109 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <reflow-controller/pid-controller.h>
+#include <string.h>
+
+void pid_init(struct pid_controller *pid, float k_deriv, float k_int, float k_p, float output_sat_min, float output_sat_max, float integral_max, float sample_period)
+{
+	if (!pid)
+		return;
+
+	pid->sample_period = sample_period;
+	pid->k_p = k_p;
+	pid->k_int = k_int;
+	pid->k_deriv = k_deriv;
+	pid->k_int_t = pid->k_int * pid->sample_period * 0.5f;
+	pid->k_deriv_t = pid->k_deriv * 2.0f / pid->sample_period;
+	pid->output_sat_max = output_sat_max;
+	pid->output_sat_min = output_sat_min;
+	pid->integral_max = integral_max;
+
+	pid_zero(pid);
+}
+
+int pid_copy(struct pid_controller *dest, const struct pid_controller *src)
+{
+	if (!dest || !src)
+		return -1;
+
+	memcpy(dest, src, sizeof(struct pid_controller));
+
+	return 0;
+}
+
+void pid_zero(struct pid_controller *pid)
+{
+	pid->control_output = 0.0f;
+	pid->last_in = 0.0f;
+	pid->integral = 0.0f;
+}
+
+static void calculate_integral(struct pid_controller *pid, float deviation)
+{
+	pid->integral = pid->integral + pid->k_int_t * (deviation + pid->last_in);
+
+	/* Saturate integral term to spoecified maximum */
+	if (pid->integral > pid->integral_max) {
+		pid->integral = pid->integral_max;
+	} else if (pid->integral < -pid->integral_max){
+		pid->integral = - pid->integral_max;
+	}
+}
+
+float pid_sample(struct pid_controller *pid, float deviation)
+{
+	float output;
+
+	if (!pid)
+		return 0.0;
+
+	output = deviation * pid->k_p;
+
+	if (!(deviation > 0.0f && pid->control_output > pid->output_sat_max - 0.5) &&
+	    !(deviation < 0.0f && pid->control_output < pid->output_sat_min + 0.5)) {
+		calculate_integral(pid, deviation);
+	}
+
+	/* Calculate derivative part */
+	pid->derivate = pid->k_deriv_t * (deviation - pid->last_in) - pid->derivate;
+
+	output += pid->derivate;
+	output += pid->integral;
+
+	/* Saturate output */
+	if (output < pid->output_sat_min)
+		output = pid->output_sat_min;
+	else if (output > pid->output_sat_max)
+		output = pid->output_sat_max;
+
+	pid->control_output = output;
+	pid->last_in = deviation;
+
+	return output;
+}
+
+float pid_get_control_output(const struct pid_controller *pid)
+{
+	if (!pid)
+		return 0.0f;
+
+	return pid->control_output;
+}

stm-firmware/program-device.sh

@@ -1,5 +1,10 @@
 #!/bin/bash
 
+if [[ -z $1 ]]; then
+	echo "Usage: $0 <ELF-file>"
+	exit -1
+fi
+
 JLinkGDBServer -if SWD -device STM32F407VE &
 sleep 2
 
@@ -12,7 +17,7 @@ if [[ $gdbpid == "" ]]; then
 	exit
 fi
 
-arm-none-eabi-gdb -x program-device.gdb reflow-controller.elf
+arm-none-eabi-gdb -x program-device.gdb $1
 sleep 2
 
 kill $gdbpid

stm-firmware/reflow-menu.c

@@ -0,0 +1,281 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <reflow-controller/reflow-menu.h>
+#include <reflow-controller/ui/menu.h>
+#include <reflow-controller/ui/lcd.h>
+#include <reflow-controller/rotary-encoder.h>
+#include <reflow-controller/systick.h>
+#include <reflow-controller/adc-meas.h>
+#include <reflow-controller/safety-adc.h>
+#include <reflow-controller/temp-converter.h>
+#include <helper-macros/helper-macros.h>
+#include <stm-periph/unique-id.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+
+static char __attribute__((section(".ccmram"))) display_buffer[4][21] = {0};
+static struct lcd_menu reflow_menu;
+static struct lcd_menu * const reflow_menu_ptr = &reflow_menu;
+
+static void update_display_buffer(uint8_t row, const char *data)
+{
+	int i;
+
+	if (row > 4)
+		return;
+	if (!data)
+		return;
+
+	for (i = 0; data[i] && i < LCD_CHAR_WIDTH; i++) {
+		display_buffer[row][i] = data[i];
+	}
+
+	display_buffer[row][i] = 0;
+}
+
+static void reflow_menu_monitor(struct lcd_menu *menu, enum menu_entry_func_entry entry_type, void *parent)
+{
+	static void *my_parent;
+	static uint64_t my_timestamp = 0;
+	char line[17];
+	float tmp;
+	int res;
+	const char *prefix;
+
+	if (entry_type == MENU_ENTRY_FIRST_ENTER) {
+		my_parent = parent;
+		menu_display_clear(menu);
+	}
+
+	if (systick_ticks_have_passed(my_timestamp, 250)) {
+		my_timestamp = systick_get_global_tick();
+		adc_pt1000_get_current_resistance(&tmp);
+		snprintf(line, sizeof(line), "Res: %.1f", tmp);
+		menu->update_display(0, line);
+
+		res = temp_converter_convert_resistance_to_temp(tmp, &tmp);
+		switch (res) {
+		case -1:
+			prefix = "<";
+			break;
+		case 1:
+			prefix = ">";
+			break;
+		default:
+			prefix = "";
+			break;
+		}
+
+		snprintf(line, sizeof(line), "Temp: %s%.1f " LCD_DEGREE_SYMBOL_STRING "C", prefix, tmp);
+		menu->update_display(1, line);
+
+		tmp = safety_adc_get_temp();
+		snprintf(line, sizeof(line), "Tj: %.1f " LCD_DEGREE_SYMBOL_STRING "C", tmp);
+		menu->update_display(2, line);
+
+		tmp = safety_adc_get_vref();
+		snprintf(line, sizeof(line), "Vref: %.1f mV", tmp);
+		menu->update_display(3, line);
+	}
+
+	if (menu->inputs.push_button == BUTTON_SHORT_RELEASED || menu->inputs.push_button == BUTTON_LONG) {
+		menu_entry_dropback(menu, my_parent);
+	}
+}
+
+static void reflow_menu_about(struct lcd_menu *menu, enum menu_entry_func_entry entry_type, void *parent)
+{
+	static void *my_parent;
+	static bool button_ready;
+	static int page = 0;
+	static uint32_t uptime_secs;
+	uint32_t new_uptime_secs;
+	uint32_t uptime_mins;
+	uint32_t uptime_hours;
+	uint32_t uptime_days;
+	int16_t rot_delta;
+	uint32_t ser1, ser2, ser3;
+	enum button_state push_button;
+
+	if (entry_type == MENU_ENTRY_FIRST_ENTER) {
+		uptime_secs = 0ULL;
+		page = 0;
+		my_parent = parent;
+		button_ready = false;
+		menu_display_clear(menu);
+		menu_ack_rotary_delta(menu);
+	}
+
+	rot_delta = menu_get_rotary_delta(menu);
+	if (rot_delta >= 4) {
+		menu_ack_rotary_delta(menu);
+		if (page < 4) {
+			page++;
+			menu_display_clear(menu);
+		}
+	} else if (rot_delta <= -4) {
+		menu_ack_rotary_delta(menu);
+		if (page > 0) {
+			page--;
+			menu_display_clear(menu);
+		}
+	}
+
+	switch (page) {
+	case 0:
+		menu_lcd_output(menu, 0, LCD_SHIMATTA_STRING "    Shimatta");
+		menu_lcd_output(menu, 1, "Oven Controller");
+		menu_lcd_output(menu, 2, "(c) Mario H\xF5ttel");
+		menu_lcd_output(menu, 3, "Page 1/5");
+		break;
+	case 1:
+		menu_lcd_output(menu, 0, "Version Number:");
+		menu_lcd_outputf(menu, 1, "%.*s", LCD_CHAR_WIDTH, xstr(GIT_VER));
+		if (strlen(xstr(GIT_VER)) > LCD_CHAR_WIDTH) {
+			menu_lcd_outputf(menu, 2, "%s", &xstr(GIT_VER)[LCD_CHAR_WIDTH]);
+		}
+		menu_lcd_output(menu, 3, "Page 2/5");
+		break;
+	case 2:
+		menu_lcd_output(menu, 0, "Compile Info");
+		menu_lcd_output(menu, 1, __DATE__);
+		menu_lcd_output(menu, 2, __TIME__);
+		menu_lcd_output(menu, 3, "Page 3/5");
+		break;
+	case 3:
+		unique_id_get(&ser1, &ser2, &ser3);
+
+		menu_lcd_outputf(menu, 0, "Serial: %08X", ser1);
+		menu_lcd_outputf(menu, 1, "        %08X", ser2);
+		menu_lcd_outputf(menu, 2, "        %08X", ser3);
+		menu_lcd_output(menu, 3, "Page 4/5");
+		break;
+	case 4:
+		systick_get_uptime_from_tick(&uptime_days, &uptime_hours, &uptime_mins, &new_uptime_secs);
+		if (new_uptime_secs != uptime_secs) {
+			uptime_secs = new_uptime_secs;
+			menu_lcd_output(menu, 0, "Uptime:");
+			menu_lcd_outputf(menu, 1, "%lu day%s %02lu:%02lu:%02lu",
+				 uptime_days, (uptime_days == 1 ? "" : "s"), uptime_hours, uptime_mins, uptime_secs);
+			menu_lcd_output(menu, 3, "Page 5/5");
+		}
+		break;
+	default:
+		page = 0;
+		break;
+	}
+
+	push_button = menu_get_button_state(menu);
+
+	if (push_button == BUTTON_IDLE)
+		button_ready = true;
+
+	if (button_ready &&
+		(push_button == BUTTON_SHORT_RELEASED || push_button == BUTTON_LONG)) {
+		menu_entry_dropback(menu, my_parent);
+	}
+}
+
+static void reflow_menu_root_entry(struct lcd_menu *menu, enum menu_entry_func_entry entry_type, void *parent)
+{
+	(void)parent;
+	static struct menu_list list;
+	static bool button_valid;
+	static const char * const root_entry_names[] = {
+		"About",
+		"Monitoring",
+		NULL
+	};
+	static const menu_func_t root_entry_funcs[] = {
+		reflow_menu_about,
+		reflow_menu_monitor
+	};
+	enum button_state push_button;
+	int16_t rot_delta;
+
+	if (entry_type != MENU_ENTRY_CONTINUE) {
+		menu_display_clear(menu);
+		update_display_buffer(0, "Main Menu");
+		menu_ack_rotary_delta(menu);
+		if (entry_type == MENU_ENTRY_FIRST_ENTER) {
+			button_valid = false;
+			list.entry_names = root_entry_names;
+			list.submenu_list = root_entry_funcs;
+			list.update_display = menu->update_display;
+			list.currently_selected = 0;
+			menu_list_compute_count(&list);
+		}
+	}
+
+	push_button = menu_get_button_state(menu);
+	rot_delta = menu_get_rotary_delta(menu);
+
+	if (push_button == BUTTON_IDLE) {
+		button_valid = true;
+	} else if (button_valid && push_button == BUTTON_SHORT_RELEASED) {
+		/* Enter currently selected menu_entry */
+		menu_list_enter_selected_entry(&list, menu);
+	}
+
+	if (rot_delta >= 4) {
+		menu_list_scroll_down(&list);
+		menu_ack_rotary_delta(menu);
+	} else if (rot_delta <= -4) {
+		menu_list_scroll_up(&list);
+		menu_ack_rotary_delta(menu);
+	}
+
+	menu_list_display(&list, 1, 3);
+}
+
+int reflow_menu_handle()
+{
+	int32_t rot_delta;
+	enum button_state button;
+	static enum lcd_fsm_ret lcd_ret = LCD_FSM_NOP;
+
+	rot_delta = rotary_encoder_get_change_val();
+	button = button_read_event();
+
+	menu_handle(reflow_menu_ptr, (int16_t)rot_delta, button);
+
+	if (lcd_ret == LCD_FSM_CALL_AGAIN || lcd_tick_100us >= 5) {
+		lcd_ret = lcd_fsm_write_buffer(display_buffer);
+		lcd_tick_100us = 0UL;
+	}
+
+	if (lcd_ret == LCD_FSM_CALL_AGAIN)
+		return 0;
+	else
+		return 1;
+}
+
+void reflow_menu_init()
+{
+	rotary_encoder_setup();
+	button_init();
+	lcd_init();
+
+	menu_init(reflow_menu_ptr, reflow_menu_root_entry, update_display_buffer);
+}

stm-firmware/rotary-encoder.c

@@ -83,3 +83,8 @@ void rotary_encoder_stop(void)
 	rcc_manager_disable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(ROTARY_ENCODER_TIMER_RCC_MASK));
 	rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(ROTARY_ENCODER_RCC_MASK));
 }
+
+void rotary_encoder_zero(void)
+{
+	ROTARY_ENCODER_TIMER->CNT = 0UL;
+}

stm-firmware/safety-adc.c

@@ -0,0 +1,188 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <reflow-controller/safety-adc.h>
+#include <reflow-controller/periph-config/safety-adc-hwcfg.h>
+#include <helper-macros/helper-macros.h>
+#include <stm-periph/clock-enable-manager.h>
+
+enum safety_adc_check_result global_safety_adc_status;
+
+enum safety_adc_check_result safety_adc_get_errors()
+{
+	return global_safety_adc_status;
+}
+
+void safety_adc_clear_errors(void)
+{
+	global_safety_adc_status = SAFETY_ADC_CHECK_OK;
+}
+
+void safety_adc_init()
+{
+	rcc_manager_enable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(SAFETY_ADC_ADC_RCC_MASK));
+
+	safety_adc_clear_errors();
+
+	/* Enable temperature and VREFINT measurement */
+	ADC->CCR |= ADC_CCR_TSVREFE;
+
+	/* Set sample time for channels 16 and 17 */
+	SAFETY_ADC_ADC_PERIPHERAL->SMPR1 |= ADC_SMPR1_SMP17 | ADC_SMPR1_SMP16;
+
+	/* Standard sequence. One measurement */
+	SAFETY_ADC_ADC_PERIPHERAL->SQR1 = 0UL;
+}
+
+
+void safety_adc_deinit()
+{
+	SAFETY_ADC_ADC_PERIPHERAL->CR1 = 0UL;
+	SAFETY_ADC_ADC_PERIPHERAL->CR2 = 0UL;
+	SAFETY_ADC_ADC_PERIPHERAL->SMPR1  = 0UL;
+	rcc_manager_enable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(RCC_APB2ENR_ADC2EN));
+}
+
+enum safety_adc_check_result safety_adc_check_results(uint16_t vref_result, uint16_t temp_result,
+						      float *vref_calculated, float *temp_calculated)
+{
+	enum safety_adc_check_result res = SAFETY_ADC_CHECK_OK;
+	float vref;
+	float temp;
+
+
+	vref = (SAFETY_ADC_INT_REF_MV * 4095.0f) / (float)vref_result;
+	if (vref_calculated) {
+		*vref_calculated = vref;
+	}
+
+	temp = (((float)temp_result / 4095.0f * 2500.0f -
+			     SAFETY_ADC_TEMP_NOM_MV) / SAFETY_ADC_TEMP_MV_SLOPE) + SAFETY_ADC_TEMP_NOM;
+	if (temp_calculated) {
+		*temp_calculated = temp;
+	}
+
+	if (ABS(vref - SAFETY_ADC_VREF_MVOLT) > SAFETY_ADC_VREF_TOL_MVOLT) {
+		if (vref > SAFETY_ADC_VREF_MVOLT)
+			res |= SAFETY_ADC_CHECK_VREF_HIGH;
+		else
+			res |= SAFETY_ADC_CHECK_VREF_LOW;
+	}
+
+	if (temp < SAFETY_ADC_TEMP_LOW_LIM)
+		res |= SAFETY_ADC_CHECK_TEMP_LOW;
+	else if (temp < SAFETY_ADC_CHECK_TEMP_HIGH)
+		res |= SAFETY_ADC_CHECK_TEMP_HIGH;
+
+	return res;
+}
+
+int safety_adc_poll_result(uint16_t *adc_result)
+{
+	int ret = 0;
+
+	if (!adc_result)
+		return -1000;
+
+	if (!(SAFETY_ADC_ADC_PERIPHERAL->CR2 & ADC_CR2_ADON)) {
+		return -1;
+	}
+
+	if (SAFETY_ADC_ADC_PERIPHERAL->SR & ADC_SR_EOC) {
+		*adc_result = (uint16_t)SAFETY_ADC_ADC_PERIPHERAL->DR;
+		SAFETY_ADC_ADC_PERIPHERAL->CR2 &= ~ADC_CR2_ADON;
+		ret = 1;
+	}
+
+	return ret;
+}
+
+void safety_adc_trigger_meas(enum safety_adc_meas_channel measurement)
+{
+	switch (measurement) {
+	case SAFETY_ADC_MEAS_TEMP:
+		SAFETY_ADC_ADC_PERIPHERAL->SQR3 = TEMP_CHANNEL_NUM;
+		break;
+	case SAFETY_ADC_MEAS_VREF:
+		SAFETY_ADC_ADC_PERIPHERAL->SQR3 = INT_REF_CHANNEL_NUM;
+		break;
+	default:
+		return;
+	}
+
+	SAFETY_ADC_ADC_PERIPHERAL->CR2 |= ADC_CR2_ADON;
+	SAFETY_ADC_ADC_PERIPHERAL->CR2 |= ADC_CR2_SWSTART;
+}
+
+static uint16_t safety_vref_meas_raw;
+static bool safety_vref_valid = false;
+static uint16_t safety_temp_meas_raw;
+static bool safety_temp_valid = false;
+static float safety_vref;
+static float safety_temp;
+
+enum safety_adc_check_result handle_safety_adc()
+{
+	static enum safety_adc_meas_channel safety_meas_channel = SAFETY_ADC_MEAS_VREF;
+	enum safety_adc_check_result check_result;
+	uint16_t result;
+	int poll_status;
+
+	poll_status = safety_adc_poll_result(&result);
+
+	if (poll_status < 0) {
+		safety_adc_trigger_meas(safety_meas_channel);
+	} else if (poll_status > 0) {
+		switch (safety_meas_channel) {
+		case SAFETY_ADC_MEAS_TEMP:
+			safety_temp_meas_raw = result;
+			safety_temp_valid = true;
+			safety_meas_channel = SAFETY_ADC_MEAS_VREF;
+			break;
+		case SAFETY_ADC_MEAS_VREF:
+			safety_vref_meas_raw = result;
+			safety_vref_valid = true;
+			safety_meas_channel = SAFETY_ADC_MEAS_TEMP;
+			break;
+		default:
+			safety_meas_channel = SAFETY_ADC_MEAS_VREF;
+			return SAFETY_ADC_INTERNAL_ERROR;
+		}
+	}
+
+	if (safety_temp_valid && safety_vref_valid) {
+		check_result = safety_adc_check_results(safety_vref_meas_raw, safety_temp_meas_raw, &safety_vref, &safety_temp);
+		global_safety_adc_status |= check_result;
+	} else {
+		check_result = SAFETY_ADC_CHECK_OK;
+	}
+
+	return check_result;
+}
+
+float safety_adc_get_temp()
+{
+	return safety_temp;
+}
+
+float safety_adc_get_vref()
+{
+	return safety_vref;
+}

stm-firmware/settings/settings-sd-card.c

@@ -0,0 +1,21 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <reflow-controller/settings/settings-sd-card.h>

stm-firmware/settings/settings.c

@@ -0,0 +1,26 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <reflow-controller/settings/settings.h>
+
+int settings_save_calibration()
+{
+	return 0;
+}

stm-firmware/shell.c

@@ -18,28 +18,33 @@
  * If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <stm32/stm32f4xx.h>
+#include <cmsis/core_cm4.h>
 #include <reflow-controller/shell.h>
 #include <stm-periph/uart.h>
 #include <string.h>
 #include <reflow-controller/adc-meas.h>
 #include <reflow-controller/digio.h>
 #include <stdlib.h>
+#include <malloc.h>
 #include <helper-macros/helper-macros.h>
 #include <reflow-controller/systick.h>
 #include <stm-periph/unique-id.h>
 #include <reflow-controller/calibration.h>
 #include <reflow-controller/temp-converter.h>
-
+#include <fatfs/ff.h>
 #include <reflow-controller/stack-check.h>
 #include <reflow-controller/rotary-encoder.h>
+#include <reflow-controller/safety-adc.h>
 
 #ifndef GIT_VER
 #define GIT_VER "VERSION NOT SET"
 #endif
 
+extern struct stm_uart shell_uart;
 static shellmatta_instance_t shell;
 static char shell_buffer[512];
-static char history_buffer[1024];
+static char history_buffer[600];
 
 static shellmatta_retCode_t shell_cmd_ver(const shellmatta_handle_t   handle,
 					  const char                  *arguments,
@@ -87,7 +92,8 @@ static shellmatta_retCode_t shell_cmd_digio_set(const shellmatta_handle_t   hand
 	char buff[64];
 	char *curr_token;
 
-	strncpy(buff, arguments, sizeof(buff));
+	strncpy(buff, arguments, sizeof(buff)-1);
+	buff[63] = '\0';
 
 	curr_token = strtok(buff, " ");
 	curr_token = strtok(NULL, " ");
@@ -183,8 +189,18 @@ static shellmatta_retCode_t shell_cmd_uptime(const shellmatta_handle_t   handle,
 {
 	(void)arguments;
 	(void)length;
+	uint32_t days;
+	uint32_t hours;
+	uint32_t mins;
+	uint32_t secs;
 
-	shellmatta_printf(handle, "Uptime: %llu secs", global_tick_ms/1000);
+	systick_get_uptime_from_tick(&days, &hours, &mins, &secs);
+
+	shellmatta_printf(handle, "Uptime: %u day%s %02u:%02u:%02u",
+					days, (days == 1 ? "" : "s"),
+					hours,
+					mins,
+					secs);
 	return SHELLMATTA_OK;
 }
 
@@ -195,16 +211,16 @@ static shellmatta_retCode_t shell_cmd_cal(const shellmatta_handle_t   handle,
 	(void)arguments;
 	(void)length;
 
-	calibration_sequence_shell_cmd(handle);
-	return SHELLMATTA_OK;
+	return calibration_sequence_shell_cmd(handle, arguments, length);
 }
 
-static shellmatta_retCode_t shell_get_sp(const shellmatta_handle_t   handle,
-					 const char                  *arguments,
-					 uint32_t length)
+static shellmatta_retCode_t shell_meminfo(const shellmatta_handle_t   handle,
+					  const char                  *arguments,
+					  uint32_t length)
 {
 	(void)arguments;
 	(void)length;
+	struct mallinfo mi;
 
 	shellmatta_printf(handle,
 			  "Stack pointer: %p\r\n"
@@ -213,6 +229,15 @@ static shellmatta_retCode_t shell_get_sp(const shellmatta_handle_t   handle,
 			  read_stack_pointer(),
 			  stack_check_get_usage(),
 			  stack_check_get_free());
+
+	mi = mallinfo();
+	shellmatta_printf(handle, "\r\nDynamic Memory Management\r\n");
+	shellmatta_printf(handle, "Allocated bytes: %d\r\n", mi.arena, mi.arena);
+	shellmatta_printf(handle, "Number of free chunks: %d\r\n", mi.ordblks);
+	shellmatta_printf(handle, "Top-most, releasable space: %d\r\n", mi.keepcost);
+	shellmatta_printf(handle, "Total free space: %d\r\n", mi.fordblks);
+	shellmatta_printf(handle, "Total allocated space: %d\r\n", mi.uordblks);
+
 	return SHELLMATTA_OK;
 }
 
@@ -224,11 +249,131 @@ static shellmatta_retCode_t shell_cmd_rot(const shellmatta_handle_t   handle,
 	(void)length;
 
 	uint32_t rot_val;
-	int32_t delta;
 
 	rot_val = rotary_encoder_get_abs_val();
-	delta = rotary_encoder_get_change_val();
-	shellmatta_printf(handle, "Rotary encoder value: %u, delta: %d\r\n", rot_val, delta);
+	//delta = rotary_encoder_get_change_val();
+	shellmatta_printf(handle, "Rotary encoder value: %u\r\n", rot_val);
+
+	return SHELLMATTA_OK;
+}
+
+static shellmatta_retCode_t shell_cmd_pt1000_res_loop(const shellmatta_handle_t handle, const char *arguments,
+						      uint32_t length)
+{
+	(void)arguments;
+	(void)length;
+	static uint64_t timestamp = 0ULL;
+
+	if (systick_ticks_have_passed(timestamp, 150)) {
+		shell_cmd_pt1000_res(handle, "", 0UL);
+		timestamp = systick_get_global_tick();
+	}
+
+	return SHELLMATTA_CONTINUE;
+}
+
+static shellmatta_retCode_t shell_cmd_ls(const shellmatta_handle_t handle, const char *arguments,
+					 uint32_t length)
+{
+	(void)length;
+	(void)arguments;
+	DIR dir;
+	FRESULT res;
+	FILINFO fno;
+
+	res = f_opendir(&dir, "/");
+	if (res != FR_OK) {
+		shellmatta_printf(handle, "Filesystem inaccessible. Is an SD Card inserted?\r\n");
+		return SHELLMATTA_OK;
+	}
+
+	while (f_readdir(&dir, &fno) == FR_OK) {
+		if (fno.fname[0] == 0)
+			break;
+		shellmatta_printf(handle, "%c\t%s\r\n", (fno.fattrib & AM_DIR ? 'd' : 'f'), fno.fname);
+	}
+
+	f_closedir(&dir);
+
+	return SHELLMATTA_OK;
+}
+
+static shellmatta_retCode_t shell_cmd_reset(const shellmatta_handle_t handle, const char *arguments,
+					    uint32_t length)
+{
+	(void)handle;
+	(void)length;
+	(void)arguments;
+
+	NVIC_SystemReset();
+
+	return SHELLMATTA_BUSY;
+}
+
+static shellmatta_retCode_t shell_cmd_cat(const shellmatta_handle_t handle, const char *arguments,
+					  uint32_t length)
+{
+	FIL file;
+	char path_buff[256];
+	const char *path;
+	UINT bytes_read;
+	FRESULT res;
+
+	strncpy(path_buff, arguments, MIN(sizeof(path_buff), length));
+	path_buff[MIN(length, sizeof(path_buff)-1)] = 0;
+	path = strtok(path_buff, " ");
+	path = strtok(NULL, " ");
+
+	if (strlen(path) == 0) {
+		shellmatta_printf(handle, "Specify path!\r\n");
+		return SHELLMATTA_OK;
+	}
+
+	res = f_open(&file, path, FA_READ);
+	if (res == FR_OK) {
+		shellmatta_write(handle, "\r\n", 2U);
+		do {
+			res = f_read(&file, path_buff, sizeof(path_buff), &bytes_read);
+			if (bytes_read > 0)
+				shellmatta_write(handle, path_buff, bytes_read);
+			else
+				break;
+		} while (res == FR_OK);
+
+		shellmatta_write(handle, "\r\n", 2U);
+	}
+
+	if (res != FR_OK) {
+		shellmatta_printf(handle, "Error reading file\r\n");
+	}
+
+	f_close(&file);
+
+	return SHELLMATTA_OK;
+}
+
+static shellmatta_retCode_t shell_cmd_safety_adc(const shellmatta_handle_t handle, const char *arguments,
+					  uint32_t length)
+{
+	(void)length;
+	(void)arguments;
+
+	shellmatta_printf(handle, "VREF:\t%8.2f\tmV\r\n", safety_adc_get_vref());
+	shellmatta_printf(handle, "TEMP:\t%8.2f\tdeg. Celsius\r\n", safety_adc_get_temp());
+
+	shellmatta_printf(handle, "Errors:\t%X", safety_adc_get_errors());
+
+	return SHELLMATTA_OK;
+}
+
+static shellmatta_retCode_t shell_cmd_safety_adc_clear_error(const shellmatta_handle_t handle, const char *arguments,
+					  uint32_t length)
+{
+	(void)length;
+	(void)arguments;
+	(void)handle;
+
+	safety_adc_clear_errors();
 
 	return SHELLMATTA_OK;
 }
@@ -243,7 +388,7 @@ static shellmatta_retCode_t shell_cmd_rot(const shellmatta_handle_t   handle,
 //    struct shellmatta_cmd   *next;      /**< pointer to next command or NULL        */
 //} shellmatta_cmd_t;
 
-static shellmatta_cmd_t cmd[9] = {
+static shellmatta_cmd_t cmd[15] = {
 	{
 		.cmd = "version",
 		.cmdAlias = "ver",
@@ -260,13 +405,21 @@ static shellmatta_cmd_t cmd[9] = {
 		.cmdFct = shell_cmd_pt1000_res,
 		.next = &cmd[2],
 	},
+	{
+		.cmd = "pt1000-dump",
+		.cmdAlias = "ptdump",
+		.helpText = "Get current filtered and calibrated PT1000 resistance in a loop",
+		.usageText = "pt1000-dump",
+		.cmdFct = shell_cmd_pt1000_res_loop,
+		.next = &cmd[3],
+	},
 	{
 		.cmd = "pt1000-clear-error",
 		.cmdAlias = "pt-clear",
 		.helpText = "Clear error status of PT1000 reading",
 		.usageText = NULL,
 		.cmdFct = shell_cmd_clear_error_status,
-		.next = &cmd[3],
+		.next = &cmd[4],
 	},
 	{
 		.cmd = "digio-get",
@@ -274,7 +427,7 @@ static shellmatta_cmd_t cmd[9] = {
 		.helpText = "Read all digital input/output ports",
 		.usageText = NULL,
 		.cmdFct = shell_cmd_digio_get,
-		.next = &cmd[4],
+		.next = &cmd[5],
 	},
 	{
 		.cmd = "digio-set",
@@ -282,7 +435,7 @@ static shellmatta_cmd_t cmd[9] = {
 		.helpText = "Set DIGIO Port",
 		.usageText = "digio-set <num> <state>",
 		.cmdFct = shell_cmd_digio_set,
-		.next = &cmd[5],
+		.next = &cmd[6],
 	},
 	{
 		.cmd = "uptime",
@@ -290,7 +443,7 @@ static shellmatta_cmd_t cmd[9] = {
 		.helpText = "Get uptime in seconds",
 		.usageText = "",
 		.cmdFct = shell_cmd_uptime,
-		.next = &cmd[6],
+		.next = &cmd[7],
 	},
 	{
 		.cmd = "calibrate",
@@ -298,15 +451,15 @@ static shellmatta_cmd_t cmd[9] = {
 		.helpText = "Calibrate resistance measurement",
 		.usageText = "",
 		.cmdFct = shell_cmd_cal,
-		.next = &cmd[7],
+		.next = &cmd[8],
 	},
 	{
-		.cmd = "get-stack-pointer",
-		.cmdAlias = "sp",
-		.helpText = "Get the stack pointer",
+		.cmd = "meminfo",
+		.cmdAlias = NULL,
+		.helpText = "Get information about memory usage",
 		.usageText = "",
-		.cmdFct = shell_get_sp,
-		.next = &cmd[8],
+		.cmdFct = shell_meminfo,
+		.next = &cmd[9],
 	},
 	{
 		.cmd = "rotary-encoder",
@@ -314,8 +467,49 @@ static shellmatta_cmd_t cmd[9] = {
 		.helpText = "Get current rotary encoder value",
 		.usageText = "",
 		.cmdFct = shell_cmd_rot,
+		.next = &cmd[10],
+	},
+	{
+		.cmd = "ls",
+		.cmdAlias = NULL,
+		.helpText = "List filesystem contents",
+		.usageText = "",
+		.cmdFct = shell_cmd_ls,
+		.next = &cmd[11],
+	},
+	{
+		.cmd = "reset",
+		.cmdAlias = NULL,
+		.helpText = "Reset controller",
+		.usageText = "reset",
+		.cmdFct = shell_cmd_reset,
+		.next = &cmd[12],
+	},
+	{
+		.cmd = "cat",
+		.cmdAlias = NULL,
+		.helpText = "Print file contents",
+		.usageText = "cat <path>",
+		.cmdFct = shell_cmd_cat,
+		.next = &cmd[13],
+	},
+	{
+		.cmd = "safety-adc",
+		.cmdAlias = NULL,
+		.helpText = "",
+		.usageText = "",
+		.cmdFct = shell_cmd_safety_adc,
+		.next = &cmd[14],
+	},
+	{
+		.cmd = "safety-adc-clear-error",
+		.cmdAlias = NULL,
+		.helpText = "",
+		.usageText = "",
+		.cmdFct = shell_cmd_safety_adc_clear_error,
 		.next = NULL,
-	}
+	},
+
 };
 
 shellmatta_handle_t shell_init(shellmatta_write_t write_func)
@@ -324,13 +518,21 @@ shellmatta_handle_t shell_init(shellmatta_write_t write_func)
 	shellmatta_retCode_t ret;
 
 	ret = shellmatta_doInit(&shell, &handle, shell_buffer, sizeof(shell_buffer), history_buffer, sizeof(history_buffer),
-				"\e[1;32mEnter command:\e[m\r\n", cmd, write_func);
+				"\e[1;32mReflow Controller>\e[m ", cmd, write_func);
 	if (ret != SHELLMATTA_OK)
 		handle = NULL;
 
 	return handle;
 }
 
+void shell_print_motd(shellmatta_handle_t shell)
+{
+	/* Clear display and set cursor to home position */
+	shellmatta_printf(shell, "\e[2J\e[H");
+	shellmatta_printf(shell, "Shimatta 仕舞った Reflow Controller ready\r\n\r\n");
+	shell_cmd_ver(shell, NULL, 0UL);
+	shell_handle_input(shell, "\r\n", 2UL);
+}
 
 void shell_handle_input(shellmatta_handle_t shell, const char *data, size_t len)
 {

stm-firmware/shellmatta

@@ -1 +1 @@
-Subproject commit 6c76dfc7aed2594579f09d0b797d6a51cffff343
+Subproject commit 73e8f0af036e6e35cfa696cebf35726bed8ed299

stm-firmware/stm32f407vet6_flash.ld

@@ -112,13 +112,8 @@ SECTIONS
 
   _siccmram = LOADADDR(.ccmram);
 
-  /* CCM-RAM section 
-  * 
-  * IMPORTANT NOTE! 
-  * If initialized variables will be placed in this section, 
-  * the startup code needs to be modified to copy the init-values.  
-  */
-  .ccmram :
+  /* CCM-RAM section  */
+  .ccmram (NOLOAD):
   {
     . = ALIGN(4);
     _sccmram = .;       /* create a global symbol at ccmram start */
@@ -126,12 +121,12 @@ SECTIONS
     *(.ccmram*)
     . = ALIGN(4);
     _eccmram = .;       /* create a global symbol at ccmram end */
-  } >CCM AT> FLASH
+  } >CCM
 
  _sidata = LOADADDR(.data);
 
   /* Initialized data sections goes into RAM, load LMA copy after code */
-  .data : 
+ .data : 
   {
     . = ALIGN(4);
     _sdata = .;        /* create a global symbol at data start */

stm-firmware/syscalls.c

@@ -89,6 +89,12 @@ int _write(int fd, const void *buf, int count)
 {
 	if (fd == 1)
 		uart_send_array_with_dma(&shell_uart, (char *)buf, count);
+	else if (fd == 2) {
+		uart_send_string_with_dma(&shell_uart, "\e[31m");
+		uart_send_array_with_dma(&shell_uart, (char *)buf, count);
+		uart_send_string_with_dma(&shell_uart, "\e[m");
+	}
+
 	return count;
 }
 

stm-firmware/systick.c

@@ -26,12 +26,13 @@
 #include <stm32/stm32f4xx.h>
 #include <cmsis/core_cm4.h>
 
-volatile uint32_t wait_tick_ms;
-volatile uint64_t global_tick_ms;
+volatile uint32_t wait_tick_ms = 0UL;
+volatile uint64_t global_tick_ms = 0ULL;
+volatile uint32_t lcd_tick_100us = 0UL;
 
 void systick_setup(void)
 {
-	/* Setup Systick for 1ms tick @ 168 MHz Clock Speed */
+	/* Setup Systick for 100us tick @ 168 MHz Clock Speed */
 	SysTick_Config(SYSTICK_RELOAD);
 }
 
@@ -43,7 +44,62 @@ void systick_wait_ms(uint32_t ms)
 
 uint64_t systick_get_global_tick()
 {
-	return global_tick_ms;
+	uint64_t temp;
+
+	__disable_irq();
+	temp = global_tick_ms;
+	__enable_irq();
+
+	return temp;
+}
+
+void systick_get_uptime_from_tick(uint32_t *days, uint32_t *hours, uint32_t *minutes, uint32_t *seconds)
+{
+	uint64_t tick_secs;
+	uint32_t secs;
+	uint32_t mins;
+	uint32_t hs;
+	uint32_t ds;
+
+
+	tick_secs = systick_get_global_tick() / 1000;
+	secs = tick_secs % 60;
+	tick_secs /= 60;
+	mins = tick_secs % 60;
+	tick_secs /= 60;
+	hs = tick_secs % 60;
+	tick_secs /= 24;
+	ds = tick_secs;
+
+	if (days)
+		*days = ds;
+	if (hours)
+		*hours = hs;
+	if (minutes)
+		*minutes = mins;
+	if (seconds)
+		*seconds = secs;
+
+}
+
+bool __attribute__((optimize("O3"))) systick_ticks_have_passed(uint64_t start_timestamp, uint64_t ticks)
+{
+	uint64_t end_timestamp = start_timestamp + ticks;
+	uint64_t current_timestamp = systick_get_global_tick();
+
+	/* wrap around expected */
+	if (end_timestamp < start_timestamp) {
+		/* Wrap around occured */
+		if (current_timestamp < start_timestamp) {
+			if (current_timestamp >= end_timestamp)
+				return true;
+		}
+	} else {
+		if (current_timestamp >= end_timestamp)
+			return true;
+	}
+
+	return false;
 }
 
 /**
@@ -53,9 +109,16 @@ uint64_t systick_get_global_tick()
  *
  * @warning For calling cyclic functions use separate timers/flags and don't spoil this function
  */
-void SysTick_Handler()
+void __attribute__((optimize("O3"))) SysTick_Handler()
 {
-	/* Increase tick counters */
-	wait_tick_ms++;
-	global_tick_ms++;
+	static uint32_t pre_tick = 0UL;
+
+	pre_tick++;
+	if (pre_tick == 10) {
+		pre_tick = 0;
+		/* Increase tick counters */
+		wait_tick_ms++;
+		global_tick_ms++;
+	}
+	lcd_tick_100us++;
 }

stm-firmware/ui/lcd.c

@@ -0,0 +1,464 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* Thanks to
+ * https://www.mikrocontroller.net/articles/AVR-GCC-Tutorial/LCD-Ansteuerung
+ * for the basic code construct
+ */
+
+#include <stm32/stm32f4xx.h>
+#include <reflow-controller/ui/lcd.h>
+#include <reflow-controller/systick.h>
+#include <stm-periph/clock-enable-manager.h>
+#include <stm-periph/stm32-gpio-macros.h>
+#include <stdbool.h>
+#include <string.h>
+
+static void lcd_port_clear(void)
+{
+	LCD_DPORT->ODR &= ~(LCD_E_MASK);
+	LCD_DPORT->ODR &= ~(LCD_DATA_MASK | LCD_RS_MASK | LCD_E_MASK);
+}
+
+static void lcd_enable(void)
+{
+	LCD_DPORT->ODR |= LCD_E_MASK;
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	//systick_wait_ms(10);
+	LCD_DPORT->ODR &= ~LCD_E_MASK;
+	//systick_wait_ms(10);
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+}
+
+static void lcd_out(uint8_t data)
+{
+	LCD_DPORT->ODR &= ~(LCD_DATA_MASK);
+	LCD_DPORT->ODR |= (data << LCD_DATA_BIT_OFFSET) & LCD_DATA_MASK;
+}
+
+static void lcd_data(uint8_t data)
+{
+	lcd_port_clear();
+	LCD_DPORT->ODR |= LCD_RS_MASK;
+	lcd_out((data>>4) & 0xFU);
+	lcd_enable();
+	lcd_out(data & 0xFU);
+	lcd_enable();
+	systick_wait_ms(1);
+}
+
+static void lcd_command(uint8_t data)
+{
+	lcd_port_clear();
+	lcd_out((data>>4) & 0xFU);
+	lcd_enable();
+	lcd_out(data & 0xFU);
+	lcd_enable();
+	systick_wait_ms(1);
+}
+
+#define LCD_DDADR_LINE1         0x00
+#define LCD_DDADR_LINE2         0x40
+#define LCD_DDADR_LINE3         0x10
+#define LCD_DDADR_LINE4         0x50
+
+// Clear Display -------------- 0b00000001
+#define LCD_CLEAR_DISPLAY       0x01
+
+// Cursor Home ---------------- 0b0000001x
+#define LCD_CURSOR_HOME         0x02
+
+// Set Entry Mode ------------- 0b000001xx
+#define LCD_SET_ENTRY           0x04
+
+#define LCD_ENTRY_DECREASE      0x00
+#define LCD_ENTRY_INCREASE      0x02
+#define LCD_ENTRY_NOSHIFT       0x00
+#define LCD_ENTRY_SHIFT         0x01
+
+// Set Display ---------------- 0b00001xxx
+#define LCD_SET_DISPLAY         0x08
+
+#define LCD_DISPLAY_OFF         0x00
+#define LCD_DISPLAY_ON          0x04
+#define LCD_CURSOR_OFF          0x00
+#define LCD_CURSOR_ON           0x02
+#define LCD_BLINKING_OFF        0x00
+#define LCD_BLINKING_ON         0x01
+
+// Set Shift ------------------ 0b0001xxxx
+#define LCD_SET_SHIFT           0x10
+
+#define LCD_CURSOR_MOVE         0x00
+#define LCD_DISPLAY_SHIFT       0x08
+#define LCD_SHIFT_LEFT          0x00
+#define LCD_SHIFT_RIGHT         0x04
+
+// Set Function --------------- 0b001xxxxx
+#define LCD_SET_FUNCTION        0x20
+
+#define LCD_FUNCTION_4BIT       0x00
+#define LCD_FUNCTION_8BIT       0x10
+#define LCD_FUNCTION_1LINE      0x00
+#define LCD_FUNCTION_2LINE      0x08
+#define LCD_FUNCTION_5X7        0x00
+#define LCD_FUNCTION_5X10       0x04
+
+#define LCD_SOFT_RESET          0x30
+
+// Set CG RAM Address --------- 0b01xxxxxx  (Character Generator RAM)
+#define LCD_SET_CGADR           0x40
+
+#define LCD_GC_CHAR0            0
+#define LCD_GC_CHAR1            1
+#define LCD_GC_CHAR2            2
+#define LCD_GC_CHAR3            3
+#define LCD_GC_CHAR4            4
+#define LCD_GC_CHAR5            5
+#define LCD_GC_CHAR6            6
+#define LCD_GC_CHAR7            7
+
+// Set DD RAM Address --------- 0b1xxxxxxx  (Display Data RAM)
+#define LCD_SET_DDADR           0x80
+
+static char __attribute__((section(".ccmram"))) shadow_display[4][21];
+
+void lcd_clear(void)
+{
+	lcd_command(LCD_CLEAR_DISPLAY);
+	systick_wait_ms(3);
+}
+
+void lcd_home(void)
+{
+	lcd_command(LCD_CURSOR_HOME);
+	systick_wait_ms(3);
+}
+
+static uint8_t lcd_get_set_cursor_cmd(uint8_t x, uint8_t y)
+{
+	uint8_t data;
+
+	switch (y) {
+	case 0:
+		/* First line */
+		data = LCD_SET_DDADR + LCD_DDADR_LINE1 + x;
+		break;
+
+	case 1:
+		/* Second Line */
+		data = LCD_SET_DDADR + LCD_DDADR_LINE2 + x;
+		break;
+
+	case 2:
+		/* Third line */
+		data = LCD_SET_DDADR + LCD_DDADR_LINE3 + x;
+		break;
+
+	case 3:
+		/* Fourth line */
+		data = LCD_SET_DDADR + LCD_DDADR_LINE4 + x;
+		break;
+
+	default:
+		/* In case of wrong line, assume first line */
+		data = LCD_SET_DDADR + LCD_DDADR_LINE1;
+		break;
+	}
+
+	return data;
+}
+
+void lcd_setcursor(uint8_t x, uint8_t y)
+{
+	uint8_t data;
+
+	data = lcd_get_set_cursor_cmd(x, y);
+	lcd_command(data);
+}
+
+void lcd_string(const char *data)
+{
+	while (*data != '\0')
+		lcd_data((uint8_t)*data++);
+}
+
+static void lcd_port_init()
+{
+	LCD_DPORT->MODER &= MODER_DELETE(LCD_E) & MODER_DELETE(LCD_RS) & MODER_DELETE(LCD_DATA_BIT_OFFSET) &
+			MODER_DELETE(LCD_DATA_BIT_OFFSET + 1) & MODER_DELETE(LCD_DATA_BIT_OFFSET + 2) &
+			MODER_DELETE(LCD_DATA_BIT_OFFSET + 3);
+
+	LCD_DPORT->MODER |= OUTPUT(LCD_E) | OUTPUT(LCD_RS) | OUTPUT(LCD_DATA_BIT_OFFSET) |
+			OUTPUT(LCD_DATA_BIT_OFFSET + 1) | OUTPUT(LCD_DATA_BIT_OFFSET + 2) |
+			OUTPUT(LCD_DATA_BIT_OFFSET + 3);
+}
+
+static void lcd_clear_shadow_buff()
+{
+	int i, j;
+
+	for (i = 0; i < 4; i++) {
+		for (j = 0; j < 21; j++) {
+			shadow_display[i][j] = 0x0;
+		}
+	}
+}
+
+void lcd_init(void)
+{
+	int i;
+
+	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(LCD_RCC_MASK));
+	lcd_port_init();
+	lcd_port_clear();
+
+	lcd_clear_shadow_buff();
+
+	systick_wait_ms(100);
+	LCD_DPORT->ODR |= (0x3 << LCD_DATA_BIT_OFFSET);
+
+	for (i = 0; i < 3; i++) {
+		lcd_enable();
+		systick_wait_ms(5);
+	}
+
+	// Set 4 Bit mode
+	lcd_port_clear();
+	LCD_DPORT->ODR |= (0x2<<LCD_DATA_BIT_OFFSET);
+	lcd_enable();
+	systick_wait_ms(2);
+
+	/* 4 Bit mode 2 lines */
+	lcd_command( LCD_SET_FUNCTION |
+		     LCD_FUNCTION_4BIT |
+		     LCD_FUNCTION_2LINE |
+		     LCD_FUNCTION_5X7 );
+
+	/* Display on without cursor */
+	lcd_command( LCD_SET_DISPLAY |
+		     LCD_DISPLAY_ON |
+		     LCD_CURSOR_OFF |
+		     LCD_BLINKING_OFF);
+
+	/* Cursor increment, no scroll */
+	lcd_command( LCD_SET_ENTRY |
+		     LCD_ENTRY_INCREASE |
+		     LCD_ENTRY_NOSHIFT );
+
+	lcd_clear();
+}
+
+void lcd_deinit()
+{
+	lcd_port_clear();
+	rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(LCD_RCC_MASK));
+}
+
+static uint8_t compare_input_to_shadow(const char (*display_buffer)[21])
+{
+	uint8_t ret = 0;
+	int i, row;
+
+	for (row = 0; row < 4; row++) {
+		for (i = 0; i < 20; i++) {
+			if (display_buffer[row][i] != shadow_display[row][i]) {
+				ret |= (1U<<row);
+				break;
+			}
+		}
+	}
+
+	return ret;
+}
+
+static void lcd_fsm_enable(bool en)
+{
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	if (en)
+		LCD_DPORT->ODR |= LCD_E_MASK;
+	else
+		LCD_DPORT->ODR &= ~LCD_E_MASK;
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+	__ASM("nop");
+}
+
+static void lcd_fsm_write_command(bool high, uint8_t cmd)
+{
+	lcd_port_clear();
+
+	if (high)
+		lcd_out((cmd >> 4) & 0x0F);
+	else
+		lcd_out((cmd) & 0x0F);
+}
+
+static void lcd_fsm_write_data(bool high, uint8_t data)
+{
+	LCD_DPORT->ODR |= (1<<LCD_RS);
+	if (high)
+		lcd_out((data >> 4) & 0x0F);
+	else
+		lcd_out((data) & 0x0F);
+}
+
+enum lcd_fsm_ret lcd_fsm_write_buffer(const char (*display_buffer)[21])
+{
+	static bool idle = true;
+	static uint8_t rows_to_handle = 0;
+	static uint32_t state_cnt;
+	static uint8_t row_cnt = 0;
+	static uint32_t char_cnt;
+	static uint32_t line_len;
+	static uint64_t timestamp = 0ULL;
+	enum lcd_fsm_ret ret;
+
+	ret = LCD_FSM_NOP;
+
+	if (idle) {
+		rows_to_handle = compare_input_to_shadow(display_buffer);
+		memcpy(shadow_display, display_buffer, sizeof(shadow_display));
+		shadow_display[0][20] = 0;
+		shadow_display[1][20] = 0;
+		shadow_display[2][20] = 0;
+		shadow_display[3][20] = 0;
+		state_cnt = 0;
+		row_cnt = 0;
+		idle = false;
+	}
+
+	if (rows_to_handle == 0) {
+		idle = true;
+		return ret;
+	}
+
+	if ((rows_to_handle & (1<<row_cnt))) {
+		switch (state_cnt) {
+		case 0:
+			lcd_fsm_write_command(true, lcd_get_set_cursor_cmd(0, row_cnt));
+			line_len = strlen(&shadow_display[row_cnt][0]);
+			char_cnt = 0;
+			lcd_fsm_enable(true);
+			ret = LCD_FSM_WAIT_CALL;
+			state_cnt++;
+			break;
+		case 1:
+			lcd_fsm_enable(false);
+			ret = LCD_FSM_WAIT_CALL;
+			state_cnt++;
+			break;
+		case 2:
+			lcd_fsm_write_command(false, lcd_get_set_cursor_cmd(0, row_cnt));
+			lcd_fsm_enable(true);
+			ret = LCD_FSM_WAIT_CALL;
+			state_cnt++;
+			break;
+		case 3:
+			lcd_fsm_enable(false);
+			ret = LCD_FSM_WAIT_CALL;
+			timestamp = systick_get_global_tick();
+			state_cnt++;
+			break;
+		case 4:
+			if (!systick_ticks_have_passed(timestamp, 4)) {
+				ret = LCD_FSM_WAIT_CALL;
+			} else {
+				ret = LCD_FSM_CALL_AGAIN;
+				state_cnt++;
+			}
+			break;
+		case 5:
+			lcd_fsm_write_data(true, (char_cnt >= line_len) ? ' ' : shadow_display[row_cnt][char_cnt]);
+			lcd_fsm_enable(true);
+			ret = LCD_FSM_CALL_AGAIN;
+			state_cnt++;
+			break;
+		case 6:
+			lcd_fsm_enable(false);
+			ret = LCD_FSM_WAIT_CALL;
+			state_cnt++;
+			break;
+		case 7:
+			lcd_fsm_write_data(false, (char_cnt >= line_len) ? ' ' : shadow_display[row_cnt][char_cnt]);
+			lcd_fsm_enable(true);
+			ret = LCD_FSM_CALL_AGAIN;
+			state_cnt++;
+			break;
+		case 8:
+			lcd_fsm_enable(false);
+			ret = LCD_FSM_WAIT_CALL;
+			char_cnt++;
+			if (char_cnt < LCD_CHAR_WIDTH) {
+				state_cnt = 5;
+			} else {
+				state_cnt = 0;
+				rows_to_handle &= (uint8_t)~(1U<<row_cnt);
+				if (row_cnt < 3) {
+					row_cnt++;
+				} else {
+					idle = true;
+					row_cnt = 0;
+				}
+			}
+			break;
+		default:
+			ret = LCD_FSM_NOP;
+			idle = true;
+			rows_to_handle = 0U;
+			break;
+		}
+	} else {
+		if (row_cnt < 3) {
+			row_cnt++;
+			ret = LCD_FSM_CALL_AGAIN;
+		} else {
+			row_cnt = 0;
+			ret = LCD_FSM_NOP;
+		}
+	}
+
+	return ret;
+}

stm-firmware/ui/menu.c

@@ -0,0 +1,255 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <reflow-controller/ui/menu.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+void menu_handle(struct lcd_menu *menu, int16_t rotary_encoder_delta, enum button_state push_button)
+{
+	menu_func_t tmp;
+
+	if (!menu)
+		return;
+
+	menu->inputs.push_button = push_button;
+	menu->inputs.rotary_encoder_delta += rotary_encoder_delta;
+
+	if (menu->active_entry == NULL)
+		menu->active_entry = menu->root_entry;
+
+	tmp = menu->active_entry;
+
+
+	if (menu->active_entry_type == MENU_ENTRY_FIRST_ENTER) {
+		menu->active_entry(menu, menu->active_entry_type, menu->init_parent);
+	} else {
+		menu->active_entry(menu, menu->active_entry_type, NULL);
+	}
+
+	if (menu->active_entry_type != MENU_ENTRY_CONTINUE && tmp == menu->active_entry) {
+		menu->active_entry_type = MENU_ENTRY_CONTINUE;
+	}
+}
+
+void menu_init(struct lcd_menu *menu, menu_func_t root_node, void (*display_update)(uint8_t row, const char *data))
+{
+	if (!menu)
+		return;
+
+	menu->root_entry = root_node;
+	menu->active_entry = root_node;
+	menu->init_parent = NULL;
+	menu->inputs.push_button = BUTTON_IDLE;
+	menu->inputs.rotary_encoder_delta = 0;
+	menu->active_entry_type = MENU_ENTRY_FIRST_ENTER;
+	menu->update_display = display_update;
+}
+
+void menu_entry_dropback(struct lcd_menu *menu, menu_func_t parent_func)
+{
+	if (!menu)
+		return;
+	if (parent_func)
+		menu->active_entry = parent_func;
+	else
+		menu->active_entry = menu->root_entry;
+
+	menu->active_entry_type = MENU_ENTRY_DROPBACK;
+}
+
+void menu_entry_enter(struct lcd_menu *menu, menu_func_t entry, bool handle_immediately)
+{
+	if (!menu)
+		return;
+
+	menu->init_parent = menu->active_entry;
+	menu->active_entry_type = MENU_ENTRY_FIRST_ENTER;
+	menu->active_entry = entry;
+
+	if (handle_immediately)
+		menu_handle(menu, menu->inputs.rotary_encoder_delta, menu->inputs.push_button);
+}
+
+void menu_lcd_output(struct lcd_menu *menu, uint8_t row_num, const char *text)
+{
+	if (!menu || !menu->update_display)
+		return;
+
+	menu->update_display(row_num, text);
+}
+
+void menu_lcd_outputf(struct lcd_menu *menu, uint8_t row_num, const char *format, ...)
+{
+	char buff[64];
+	va_list valist;
+
+	va_start(valist, format);
+	vsnprintf(buff, sizeof(buff), format, valist);
+	buff[sizeof(buff) - 1] = '\0';
+	menu_lcd_output(menu, row_num, buff);
+	va_end(valist);
+}
+
+void menu_list_display(struct menu_list *list, uint32_t top_row, uint32_t bottom_row)
+{
+	uint8_t row_count;
+	uint32_t mid_row;
+	uint32_t count_above_mid;
+	uint32_t count_below_mid;
+	uint32_t start_index;
+	uint32_t current_row;
+	uint32_t current_idx;
+	char workbuff[64];
+
+	if (!list || !list->update_display)
+		return;
+
+	if (bottom_row < top_row)
+		return;
+
+	if (list->entry_count == 0) {
+		for (current_row = top_row; current_row <= bottom_row; current_row++) {
+			list->update_display((uint8_t)current_row, "");
+		}
+		return;
+	}
+
+	/* Calculate list parameters */
+	row_count = bottom_row - top_row + 1;
+	mid_row = (top_row + bottom_row) / 2;
+	count_above_mid = mid_row - top_row;
+	count_below_mid = bottom_row - mid_row;
+
+	/* Check if there are more elements above the and below the currently selected one that can be displayed. in this case position
+	 * active entry in center
+	 */
+	if (list->currently_selected > count_above_mid && (list->entry_count - list->currently_selected - 1) > count_below_mid) {
+		start_index = list->currently_selected - count_above_mid;
+	} else if (list->currently_selected < count_above_mid) {
+		start_index = 0;
+	} else if ((list->entry_count - list->currently_selected - 1) <= count_below_mid) {
+		if (list->entry_count < row_count)
+			start_index = 0;
+		else
+			start_index = list->entry_count - row_count;
+	} else {
+		start_index = 0;
+	}
+
+	for (current_row = top_row, current_idx = start_index; current_row <= bottom_row; current_row++, current_idx++) {
+		if (current_idx >= list->entry_count)
+			break;
+
+		snprintf(workbuff, sizeof(workbuff), "%c%s", (current_idx == list->currently_selected ? '>' : ' '),
+			 list->entry_names[current_idx]);
+		workbuff[sizeof(workbuff)-1] = 0;
+		list->update_display((uint8_t)current_row, workbuff);
+	}
+
+}
+
+void menu_list_compute_count(struct menu_list *list)
+{
+	uint32_t count = 0;
+
+	if (!list)
+		return;
+
+	for (count = 0; list->entry_names[count] != NULL; count++);
+	list->entry_count = count;
+}
+
+void menu_list_scroll_down(struct menu_list *list)
+{
+	if (!list)
+		return;
+
+	if (list->currently_selected < list->entry_count - 1) {
+		list->currently_selected++;
+	}
+}
+
+void menu_list_enter_selected_entry(struct menu_list *list, struct lcd_menu *menu)
+{
+	menu_func_t entry;
+
+	if (!list)
+		return;
+
+	if (!list->submenu_list)
+		return;
+
+	entry = list->submenu_list[list->currently_selected];
+
+	if (!entry)
+		return;
+
+	menu_entry_enter(menu, entry, false);
+}
+
+void menu_list_scroll_up(struct menu_list *list)
+{
+	if (!list)
+		return;
+
+	if (list->currently_selected > 0)
+		list->currently_selected--;
+}
+
+void menu_ack_rotary_delta(struct lcd_menu *menu)
+{
+	if (!menu)
+		return;
+
+	menu->inputs.rotary_encoder_delta = 0;
+}
+
+int16_t menu_get_rotary_delta(const struct lcd_menu *menu)
+{
+	int16_t ret = 0;
+
+	if (menu)
+		ret = menu->inputs.rotary_encoder_delta;
+
+	return ret;
+}
+
+enum button_state menu_get_button_state(const struct lcd_menu *menu)
+{
+	enum button_state ret = BUTTON_IDLE;
+
+	if (menu)
+		ret = menu->inputs.push_button;
+
+	return ret;
+}
+
+void menu_display_clear(struct lcd_menu *menu)
+{
+	uint8_t i;
+
+	if (!menu || !menu->update_display)
+		return;
+
+	for (i = 0; i < 4; i++)
+		menu->update_display(i, "");
+}