reflow-oven-control-sw/stm-firmware/main.c

/*
 * main.c
 *
 *  Created on: Apr 25, 2015
 *      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))

struct adc_conversions {
	uint16_t pa2_raw;
	uint16_t ref_raw;
	uint16_t temp_raw;
	uint16_t vbat_raw;
};

static volatile struct adc_conversions adc_results;

volatile uint64_t sample_count = 0;
volatile uint8_t new_data = 0;


void DMA2_Stream0_IRQHandler()
{
	uint32_t lisr;

	lisr = DMA2->LISR;
	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)
{
	RCC->AHB1ENR |= RCC_AHB1ENR_DMA2EN;

	DMA2_Stream0->M0AR = (uint32_t)dest;
	DMA2_Stream0->PAR = (uint32_t)&ADC1->DR;
	DMA2_Stream0->CR = DMA_SxCR_PL_1 | DMA_SxCR_MSIZE_0 | DMA_SxCR_PSIZE_0 | DMA_SxCR_MINC |
			DMA_SxCR_CIRC | DMA_SxCR_TCIE;
	DMA2_Stream0->NDTR = size;
	NVIC_EnableIRQ(DMA2_Stream0_IRQn);

	DMA2_Stream0->CR |= DMA_SxCR_EN;
	new_data = 0;
}

float ext_lf_corr;

float temp_lf_corr;

float ref_lf;
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;
	__DSB();
	GPIOB->MODER = OUTPUT(2) | OUTPUT(3);
	GPIOA->MODER |= ANALOG(2);
	GPIOB->ODR |= (1<<2);

	ADC1->SMPR2 = (7U<<(3*2));
	ADC1->SMPR1 = (7U<<18) | (7U<<21) | (7U<<24);
	ADC1->SQR1 = (2<<20);
	ADC1->SQR3 = (2<<0) | (16<<(5*2)) | (17<<(5*1));

	ADC->CCR |= (0x2<<16) | ADC_CCR_TSVREFE;
	ADC1->CR1 = ADC_CR1_SCAN;
	ADC1->CR2 = ADC_CR2_ADON | ADC_CR2_CONT | ADC_CR2_DMA | ADC_CR2_DDS;
	
	//while(1);

	systick_setup();

	setup_dma(&adc_results, 3);

	ADC1->CR2 |= ADC_CR2_SWSTART;

	while(1) {
		if (!new_data) {
			continue;
		}

		
		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);

		//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;
	}

}