Add ADC code to measure temperature. Supervisor not yet implemented

firmware/Makefile

@@ -12,6 +12,7 @@ endif
 
 #Add Files and Folders below#########################################################
 CFILES 	= main.c syscalls/syscalls.c setup/system_init.c startup/startup_stm32f0xx.c
+CFILES += temp-adc.c
 ASFILES = sk6812.S
 INCLUDEPATH = -Iinclude -Iinclude/cmsis
 
@@ -39,7 +40,7 @@ LFLAGS += -mfloat-abi=soft --disable-newlib-supplied-syscalls -nostartfiles
 LFLAGS += -Tstartup/stm32f030.ld -Wl,-Map=$(mapfile).map -Wl,--gc-sections -g
 
 CFLAGS = -c -fmessage-length=0 -mlittle-endian -mthumb -mcpu=cortex-m0 -mthumb-interwork
-CFLAGS += -mfloat-abi=soft -nostartfiles -Wall -g -O3
+CFLAGS += -mfloat-abi=soft -nostartfiles -Wall -g3 -O0
 
 ####################################################################################
 

firmware/include/cmsis/core_cm0.h

@@ -145,8 +145,8 @@
 #endif
 
 #include <stdint.h>                      /* standard types definitions                      */
-#include <core_cmInstr.h>                /* Core Instruction Access                         */
+#include <cmsis/core_cmInstr.h>                /* Core Instruction Access                         */
-#include <core_cmFunc.h>                 /* Core Function Access                            */
+#include <cmsis/core_cmFunc.h>                 /* Core Function Access                            */
 
 #ifdef __cplusplus
 }

firmware/include/ring-light/temp-adc.h

@@ -0,0 +1,10 @@
+#ifndef _TEMP_ADC_H_
+#define _TEMP_ADC_H_
+
+#include <stdint.h>
+
+void temperature_adc_init(void);
+
+int32_t temperature_adc_get_temp(void);
+
+#endif /* _TEMP_ADC_H_ */

firmware/include/stm32f030x6.h

@@ -9,7 +9,7 @@
   *          This file contains:
   *           - Data structures and the address mapping for all peripherals
   *           - Peripheral's registers declarations and bits definition
-  *           - Macros to access peripheral<61>s registers hardware
+  *           - Macros to access peripheral<61>s registers hardware
   *
   ******************************************************************************
   * @attention
@@ -114,8 +114,8 @@ typedef enum
   * @}
   */
 
-#include "core_cm0.h"            /* Cortex-M0 processor and core peripherals */
+#include <cmsis/core_cm0.h>            /* Cortex-M0 processor and core peripherals */
-#include "system_stm32f0xx.h"    /* STM32F0xx System Header */
+#include <system_stm32f0xx.h>    /* STM32F0xx System Header */
 #include <stdint.h>
 
 /** @addtogroup Peripheral_registers_structures

firmware/main.c

@@ -1,6 +1,7 @@
 #include <stm32f0xx.h>
 #include <cmsis/core_cm0.h>
 #include <stdbool.h>
+#include <ring-light/temp-adc.h>
 
 #define RING_MAX_LED	30u
 
@@ -16,8 +17,7 @@ enum ring_modes {
 	RING_MODE_MAX
 };
 
-unsigned int i = 0x12345678;
+volatile int32_t temperature;
-unsigned char c = 2;
 
 extern void sk6812_send_led(uint32_t rgbw);
 
@@ -33,6 +33,7 @@ int main(void)
 {
 	uint32_t led_val = 0x00UL;
 	uint32_t led_calc_val[RING_MAX_LED] = {0x00UL};
+
 	bool button_pressed = false;
 	enum ring_modes mode = RING_MODE_ALL;
 
@@ -55,9 +56,11 @@ int main(void)
 	TIM3->PSC = 0;
 	TIM3->CR1 = TIM_CR1_CEN;
 
+	temperature_adc_init();
+
 	SysTick_Config(800000);
 	while(1) {
-
+		temperature = temperature_adc_get_temp();
 		switch (mode)
 		{
 		case RING_MODE_ALL:

firmware/temp-adc.c

@@ -0,0 +1,102 @@
+#include <ring-light/temp-adc.h>
+#include <stm32f0xx.h>
+
+#define FLOAT_TO_S23_8(x) (int32_t)((x) * 1024.0f)
+
+static volatile uint16_t adc_results[16];
+static volatile int32_t vdd_lf_s23_8 = FLOAT_TO_S23_8(0);
+static volatile int32_t temp_lf_s23_8 = FLOAT_TO_S23_8(0);
+
+void temperature_adc_init(void)
+{
+	RCC->AHBENR |= RCC_AHBENR_DMAEN;
+	RCC->APB2ENR |= RCC_APB2ENR_ADCEN;
+
+	/* ADC is mapped to DMA Channel 1 */
+	SYSCFG->CFGR1 &= ~SYSCFG_CFGR1_DMA_RMP;
+
+	DMA1_Channel1->CNDTR = 16;
+	DMA1_Channel1->CPAR = (uint32_t)&ADC1->DR;
+	DMA1_Channel1->CMAR = (uint32_t)&adc_results[0];
+	DMA1_Channel1->CCR = DMA_CCR_PL_1 | DMA_CCR_MSIZE_0 | DMA_CCR_PSIZE_0 | DMA_CCR_MINC | DMA_CCR_CIRC | DMA_CCR_TCIE | DMA_CCR_EN;
+
+	NVIC_EnableIRQ(DMA1_Channel1_IRQn);
+
+	/* Calibrate the ADC */
+	ADC1->CR = ADC_CR_ADCAL;
+	while (ADC1->CR & ADC_CR_ADCAL);
+
+	/* Dummy read the offset calibration value */
+	ADC1->DR;
+	ADC1->CR = 0;
+	ADC1->CFGR1 = ADC_CFGR1_DMAEN | ADC_CFGR1_DMACFG | ADC_CFGR1_CONT;
+	ADC1->CFGR2 = ADC_CFGR2_CKMODE_1;
+	ADC1->SMPR = 7u;
+	ADC->CCR |= ADC_CCR_TSEN | ADC_CCR_VREFEN;
+	ADC1->CHSELR = (1<<17) | (1<<16);
+	ADC1->CR = ADC_CR_ADEN | ADC_CR_ADSTART;
+}
+
+static uint32_t get_temp_sensor_cal(void)
+{
+	const volatile uint16_t *cal;
+
+	cal = (const volatile uint16_t *)0x1FFFF7B8UL;
+	return (uint32_t)*cal;
+}
+
+int32_t temperature_adc_get_temp(void)
+{
+	int32_t temp;
+	const int32_t slope = FLOAT_TO_S23_8(5.336f);
+
+
+	temp = ((temp_lf_s23_8 / 16) * vdd_lf_s23_8 / FLOAT_TO_S23_8(3.3)) * 16;
+	temp = (get_temp_sensor_cal() << 10) - temp;
+	temp = (temp * 10 / slope) + 300;
+}
+
+static uint32_t get_vrefint_cal(void)
+{
+	const volatile uint16_t *cal;
+
+	cal = (const volatile uint16_t *)0x1FFFF7BAUL;
+	return (uint32_t)*cal;
+}
+
+static void process_adc_samples(void)
+{
+	int i;
+	uint32_t temp_val = 0;
+	uint32_t vref_val = 0;
+	int32_t vdd_s23_8;
+	int32_t temp_s23_8;
+	const uint32_t ref_cal = get_vrefint_cal();
+
+	for (i = 0; i < 8; i++) {
+		temp_val += adc_results[2 * i];
+		vref_val += adc_results[(2 * i) + 1];
+	}
+
+	vref_val >>= 3;
+	temp_val >>= 3;
+
+	vdd_s23_8 =  (FLOAT_TO_S23_8(3.3f) * ref_cal) / vref_val;
+	temp_s23_8 = temp_val << 10;
+
+	/* Moving average filter */
+	vdd_lf_s23_8 = (vdd_lf_s23_8 * FLOAT_TO_S23_8(0.78125f) + vdd_s23_8 * FLOAT_TO_S23_8(0.21875f)) >> 10;
+	temp_lf_s23_8 = (int32_t)((((int64_t)temp_lf_s23_8 * (int64_t)FLOAT_TO_S23_8(0.78125f)) + temp_s23_8 * FLOAT_TO_S23_8(0.21875f)) / 1024);
+}
+
+void DMA_CH1_IRQHandler(void)
+{
+	uint32_t isr;
+	
+	isr = DMA1->ISR;
+	DMA1->IFCR = isr;
+
+	if (isr & DMA_ISR_TCIF1) {
+		process_adc_samples();
+	}
+}