55 lines
1.0 KiB
C
55 lines
1.0 KiB
C
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/*
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* thermometer.c
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*
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* Created on: Jun 13, 2017
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* Author: wn
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*/
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#include "stm32f1xx_hal.h"
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#include "thermometer.h"
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#include <PontCoopScheduler.h>
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extern ADC_HandleTypeDef hadc1;
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#define NUM_OF_CONV 10
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uint16_t adcBuf[NUM_OF_CONV];
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volatile uint32_t value;
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const float R_REF = 1000.0;
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const uint16_t N_MAX = 4095;
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const float PT1000_R0 = 1000.0;
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const float PT1000_Coeff = 3.85e-3;
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void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc) {
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HAL_ADC_Stop_DMA(hadc);
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uint32_t sum = 0;
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for (uint8_t i = 0; i < NUM_OF_CONV; i++) {
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sum += adcBuf[i];
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}
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uint32_t avg = sum / NUM_OF_CONV;
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value = avg;
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}
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void thermometerStartCycle(void *handle) {
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HAL_ADC_Start_DMA(&hadc1, ((uint32_t*)adcBuf), NUM_OF_CONV);
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}
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void thermometerInit() {
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HAL_ADCEx_Calibration_Start(&hadc1);
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schAdd(thermometerStartCycle, NULL, 0, 100);
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}
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uint32_t thermometerGetValue() {
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float r = R_REF / ((((float)N_MAX) / ((float)value)) - 1.0);
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float t = ((r / PT1000_R0) - 1) / PT1000_Coeff;
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uint32_t tn = (t < 0) ? 0 : (uint16_t)t;
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return tn;
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}
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