start firmware: Function definitions for ADC

stm-firmware/.gitignore

@@ -1,2 +1,10 @@
 *.jdebug
 *.jdebug.user
+
+reflow-controller.cflags
+reflow-controller.config
+reflow-controller.creator
+reflow-controller.cxxflags
+reflow-controller.files
+reflow-controller.includes
+*.creator.user

stm-firmware/Makefile

@@ -3,16 +3,16 @@
 #Compiler:	arm-none-eabi
 #####################################################################################
 #Add Files and Folders below#########################################################
-CFILES 	= main.c syscalls.c UART/uart.c cmsis_boot/system_stm32f4xx.c
+CFILES 	= main.c syscalls.c uart/uart.c cmsis_boot/system_stm32f4xx.c systick.c
 ASFILES = boot/startup_stm32f4xx.S
-INCLUDEPATH = -Iboot -Imathlib -Icmsis -Icmsis_boot -IUART
+INCLUDEPATH = -Icmsis -Iinclude
 
 OBJDIR = obj
 target	= reflow-controller
 LIBRARYPATH = -L. -Lmathlib
 LIBRARIES = # -larm_cortexM4lf_math
 
-DEFINES = -DSTM32F407xx -DSTM32F4XX -DARM_MATH_CM4
+DEFINES = -DSTM32F407xx -DSTM32F4XX -DARM_MATH_CM4 -DHSE_VALUE=8000000UL
 mapfile = memory-mapping
 
 ifneq ($(VERBOSE),true)

stm-firmware/adc-meas.c

@@ -0,0 +1,2 @@
+#include <adc-meas.h>
+

stm-firmware/include/adc-meas.h

@@ -0,0 +1,97 @@
+#ifndef __ADCMEAS_H__
+#define __ADCMEAS_H__
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#define ADC_PT1000_FILTER_WEIGHT 0.005f
+
+#define ADC_PT1000_LOWER_WATCHDOG 100
+#define ADC_PT1000_HIGHER_WATCHDOG 4000
+
+enum adc_p1000_error {ADC_PT1000_NO_ERR= 0, ADC_PT1000_WATCHDOG_ERROR=-1, ADC_PT1000_OVERFLOW=2};
+
+/**
+ * @brief This function sets up the ADC measurement fo the external PT1000 temperature sensor
+ *
+ * Used peripherals:
+ * - Timer 2 for sampling control
+ * - ADC1
+ *
+ * The filter weight \f$\alpha\f$ is configured for @ref ADC_PT1000_FILTER_WEIGHT
+ *
+ */
+void adc_pt1000_setup_meas();
+
+/**
+ * @brief Set moving average filter parameters
+ *
+ * The sampled resistance value is filtered with an exponential average filter
+ * specified by following difference equation:
+ *
+ * \f$ y[n] = (1-\alpha)y[n-1] + \alpha x[n] \f$
+ *
+ * @param alpha
+ */
+void adc_pt1000_set_moving_average_filter_param(float alpha);
+
+/**
+ * @brief Set the calibration data for the PT1000 measurement
+ *
+ * The resulting resistance reading is
+ * \f$R_{corrected} = \sigma R_{raw} + O\f$
+ *
+ * @param offset Offset \f$O\f$
+ * @param sensitivity_deviation Sensitivity Deviation \f$\sigma\f$ after offset correction
+ */
+void adc_pt1000_set_resistance_calibration(float offset, float sensitivity_deviation, bool active);
+
+/**
+ * @brief Get the state and values of the resistance calibration
+ * @param offset Offset
+ * @param sensitivity_deviation Sensitivity deviation
+ * @param active Active state of the correction
+ */
+void adc_pt1000_get_resistance_calibration(float *offset, float *sensitivity_deviation, bool *active);
+
+/**
+ * @brief Get the current reistance value
+ *
+ * If the reistance calibration is enabled, this function applies the calculations of the raw reistance reading and
+ * returns the corrected value.
+ *
+ * If an ADC error is set, the status is negative. If the ADC is in streaming mode, the reistance reading is disabled and
+ * the status is 1. The status is 2 during the first measurements with a given filter setting. Technically, the resistance value is
+ * correct but the filter is not stable yet.
+ * Use adc_pt1000_check_error to check the error and reinitialize the ADC.
+ *
+ *
+ * @param[out] resistance Resistance output in Ohms
+ * @return Status
+ */
+int adc_pt1000_get_current_resistance(float *resistance);
+
+/**
+ * @brief Stream the raw ADC data to an array in memory.
+ *
+ * Streaming is done using DMA2 Stream0.
+ * This function is used for gathering fullspeed sampling data for external interfaces or calibration
+ * During streaming, the adc_pt1000_get_current_resistance() function will return an error
+ *
+ * @param adc_array Array to stream data to
+ * @param length Amount of data points to be measured
+ * @param flag_to_set This flag is set to 1 once the data has been measured and is transferred. A negative value indicates an error
+ * @return 0 if measurement could be started
+ */
+int adc_pt1000_stream_raw_value_to_memory(uint16_t *adc_array, uint32_t length, volatile uint8_t *flag_to_set);
+
+void adc_pt1000_convert_raw_value_array_to_resistance(float *resistance_dest, uint16_t *raw_source, uint32_t count);
+
+/**
+ * @brief Check if the ADC measurement experienced any kind of error (DMA, Analog Watchdog, etc...)
+ *
+ * In case of an error, it may be necessary to call adc_pt1000_setup_meas() again in order to recover from the error
+ */
+enum adc_p1000_error adc_pt1000_check_error();
+
+#endif // __ADCMEAS_H__

stm-firmware/include/systick.h

@@ -0,0 +1,43 @@
+#ifndef __SYSTICK_H__
+#define __SYSTICK_H__
+
+#include <stdint.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
+ */
+#define SYSTICK_RELOAD (168000UL)
+
+/**
+ * @brief Variable used by the systick_wait_ms function
+ */
+extern volatile uint32_t wait_tick_ms;
+
+/**
+ * @brief Systemclock in milliseconds.
+ *
+ * This value must not be reset during the whole runtime.
+ *
+ */
+extern volatile uint64_t global_tick_ms;
+
+/**
+ * @brief Setup the Systick timer to generate a 1 ms tick
+ */
+void systick_setup(void);
+
+/**
+ * @brief Wait for x milliseconds
+ *
+ * This function is not reentrant and must not be called from an interrupt
+ *
+ * @warning Do not use in interrupt context
+ * @param ms wait time in ms
+ */
+void systick_wait_ms(uint32_t ms);
+
+
+#endif /* __SYSTICK_H__ */

stm-firmware/main.c

@@ -5,10 +5,11 @@
  *      Author: mari
  */
 #include <stm32f4xx.h>
+#include <systick.h>
 //#include <arm_math.h>
 #include <system_stm32f4xx.h>
 #include <stdlib.h>
-
+#include <string.h>
 
 #define OUTPUT(pin)  (0b01 << (pin * 2))
 #define ANALOG(pin)  (0x03 << (pin * 2))
@@ -34,9 +35,14 @@ void DMA2_Stream0_IRQHandler()
 	DMA2->LIFCR = lisr;
 
 	if (lisr & DMA_LISR_TCIF0) {
+		if (new_data)
+			new_data = 2;
 		new_data = 1;
 		sample_count++;
+
+		GPIOB->ODR ^= (1<<3);
 	}
+
 }
 
 void setup_dma(void *dest, size_t size)
@@ -63,11 +69,16 @@ float vdd_calculated = 3.3f;
 
 float vbat_lf_corr;
 
+
+
+static void setup_timers(void)
+{
+}
+
+
 int main() {
-
 	struct adc_conversions working;
 
-
 	RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
 	RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;
 	RCC->AHB1ENR |= RCC_AHB1ENR_GPIOBEN;
@@ -75,7 +86,6 @@ int main() {
 	GPIOB->MODER = OUTPUT(2) | OUTPUT(3);
 	GPIOA->MODER |= ANALOG(2);
 	GPIOB->ODR |= (1<<2);
-	SysTick_Config(8*1680000);
 
 	ADC1->SMPR2 = (7U<<(3*2));
 	ADC1->SMPR1 = (7U<<18) | (7U<<21) | (7U<<24);
@@ -88,21 +98,24 @@ int main() {
 	
 	//while(1);
 
+	systick_setup();
+
 	setup_dma(&adc_results, 3);
 
 	ADC1->CR2 |= ADC_CR2_SWSTART;
 
 	while(1) {
-		if (!new_data)
+		if (!new_data) {
 			continue;
+		}
 
-		new_data = 0;
+		
 		memcpy(&working, &adc_results, sizeof(adc_results));
+		new_data = 0;
+		//ref_lf = 0.995f * ref_lf + 0.005f * (float)working.ref_raw;
+		//vdd_calculated = ((1.21f * 4096)/ ref_lf);
 
-		ref_lf = 0.995f * ref_lf + 0.005f * (float)working.ref_raw;
-		vdd_calculated = ((1.21f * 4096)/ ref_lf);
-
-		temp_lf_corr = 0.99f * temp_lf_corr + 0.01 * (float)working.temp_raw * vdd_calculated / 2.495f;
+		//temp_lf_corr = 0.99f * temp_lf_corr + 0.01 * (float)working.temp_raw * vdd_calculated / 2.495f;
 		ext_lf_corr = 0.995f * ext_lf_corr + 0.005f * (float)working.pa2_raw / 4096 * 2500.0f; // * vdd_calculated / 2.495f;
 
 		//vbat_lf_corr = 0.99 * vbat_lf_corr + 0.01 * (float)working.vbat_raw / 4096 * vdd_calculated * 2.0f;
@@ -110,7 +123,4 @@ int main() {
 
 }
 
-void SysTick_Handler()
-{
-	GPIOB->ODR ^= (1<<2) | (1<<3);
-}
+

stm-firmware/syscalls.c

@@ -1,11 +1,4 @@
-/*
- * syscalls.c
- *
- *  Created on: Dec 14, 2014
- *      Author: shino-chan
- */
-
-#include "uart.h"
+#include <uart/uart.h>
 
 char* _sbrk(int incr) {
             extern char heap_low;    // Defined by the linker

stm-firmware/systick.c

@@ -0,0 +1,40 @@
+#include <systick.h>
+#include <stm32f4xx.h>
+#include <core_cm4.h>
+
+volatile uint32_t wait_tick_ms;
+volatile uint64_t global_tick_ms;
+
+void systick_setup(void)
+{
+	/* Setup Systick for 1ms tick @ 168 MHz Clock Speed */
+	SysTick_Config(SYSTICK_RELOAD);
+}
+
+/**
+ * @brief Wait for x milliseconds
+ *
+ * This function is not reentrant and must not be called from an interrupt
+ *
+ * @warning Do not use in interrupt context
+ * @param ms wait time in ms
+ */
+void systick_wait_ms(uint32_t ms)
+{
+	wait_tick_ms = 0UL;
+	while (wait_tick_ms < ms);
+}
+
+/**
+ * @brief Interrupt Handler for SysTick
+ *
+ * This handler is called every millisecond
+ *
+ * @warning For calling cyclic functions use separate timers/flags and don't spoil this function
+ */
+void SysTick_Handler()
+{
+	/* Increase tick counters */
+	wait_tick_ms++;
+	global_tick_ms++;
+}

stm-firmware/uart/uart.c

@@ -8,7 +8,7 @@
 //PA2 => TX
 //PA3 => RX
 //Alternate Function 7
-#include "uart.h"
+#include <uart/uart.h>
 #include <stm32f4xx.h>
 
 void initUART() {