Fix ADC Watchdog handling

stm-firmware/Makefile

@@ -30,7 +30,7 @@ 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
@@ -53,6 +53,8 @@ CFILES += stack-check.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
+
 DEFINES += -DDEBUGBUILD
 
 ###################################################################################

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;
@@ -334,6 +335,8 @@ void ADC_IRQHandler(void)
 
 	if (adc1_sr & ADC_SR_AWD) {
 		ADC1->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/include/reflow-controller/adc-meas.h

@@ -59,6 +59,12 @@
  */
 #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 +113,7 @@ 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

stm-firmware/include/reflow-controller/oven-driver.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 __OVEN_DRIVER_H__
+#define __OVEN_DRIVER_H__
+
+#endif /* __OVEN_DRIVER_H__ */

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

@@ -0,0 +1,44 @@
+/* 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 output_sat_max;
+	float output_sat_min;
+	float integral_max;
+	volatile float control_output;
+	volatile float last_in;
+	volatile float integral;
+};
+
+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);
+
+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);
+
+#endif /* __PID_CONTROLLER_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/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/main.c

@@ -32,7 +32,9 @@
 #include <reflow-controller/systick.h>
 #include <reflow-controller/adc-meas.h>
 #include <reflow-controller/shell.h>
+#include <reflow-controller/pid-controller.h>
 #include <reflow-controller/digio.h>
+#include <reflow-controller/temp-converter.h>
 #include <reflow-controller/rotary-encoder.h>
 #include <stm-periph/stm32-gpio-macros.h>
 #include <stm-periph/clock-enable-manager.h>
@@ -55,8 +57,8 @@ static void setup_nvic_priorities()
 static float pt1000_value;
 static volatile int pt1000_value_status;
 static uint32_t rot;
-
-
+static volatile float pid_out;
+static volatile float current_temperature;
 
 static inline void uart_gpio_config()
 {
@@ -113,6 +115,9 @@ int main()
 	shellmatta_handle_t shell_handle;
 	int uart_receive_status;
 
+	static struct pid_controller pid;
+	uint64_t pid_timestamp = 0;
+
 	setup_nvic_priorities();
 	systick_setup();
 
@@ -134,9 +139,20 @@ int main()
 		f_close(&test_file);
 	}
 
+	pid_init(&pid, 0.1, 0.1, 4.0, 0.0, 100.0, 40.0);
+	pid_zero(&pid);
 
 	while (1) {
 		pt1000_value_status = adc_pt1000_get_current_resistance(&pt1000_value);
+
+		if (pt1000_value_status >= 0) {
+			(void)temp_converter_convert_resistance_to_temp(pt1000_value, (float *)&current_temperature);
+			if ((systick_get_global_tick() - pid_timestamp) >= 250) {
+				pid_out = pid_sample(&pid, 100.0 - current_temperature);
+				pid_timestamp = systick_get_global_tick();
+			}
+		}
+
 		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)

stm-firmware/oven-driver.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/oven-driver.h>

stm-firmware/pid-controller.c

@@ -0,0 +1,90 @@
+/* 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>
+
+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)
+{
+	if (!pid)
+		return;
+
+	pid->k_p = k_p;
+	pid->k_int = k_int;
+	pid->k_deriv = k_deriv;
+	pid->output_sat_max = output_sat_max;
+	pid->output_sat_min = output_sat_min;
+	pid->control_output = 0;
+	pid->integral_max = integral_max;
+}
+
+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 += deviation * pid->k_int;
+
+	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);
+	}
+
+	output += pid->integral;
+	output -= (deviation - pid->last_in) * pid->k_deriv;
+
+	pid->last_in = deviation;
+
+	if (output > pid->output_sat_max)
+		output = pid->output_sat_max;
+	if (output < pid->output_sat_min)
+		output = pid->output_sat_min;
+
+	pid->control_output = output;
+
+	return output;
+}
+
+float pid_get_control_output(const struct pid_controller *pid)
+{
+	if (!pid)
+		return 0.0f;
+
+	return pid->control_output;
+}

stm-firmware/shell.c

@@ -274,8 +274,11 @@ static shellmatta_retCode_t shell_cmd_pt1000_res_loop(const shellmatta_handle_t
 			shellmatta_printf(handle, "\x1b[1A\x1b[150D\x1b[K");
 		shell_cmd_pt1000_res(handle, "", 0UL);
 
-		led_set(0, led_status);
-		led_set(1, !led_status);
+		led_set(1, led_status);
+		if (adc_pt1000_check_error() & ADC_PT1000_WATCHDOG_ERROR) {
+			led_set(0, 1);
+		}
+
 		led_status ^= 0x1;
 
 		systick_wait_ms(150);

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;
 }