thermometer stuff started

my_src/thermometer.c

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

my_src/thermometer.h

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+/*
+ * thermometer.h
+ *
+ *  Created on: Jun 13, 2017
+ *      Author: wn
+ */
+
+#ifndef THERMOMETER_H_
+#define THERMOMETER_H_
+
+void thermometerInit();
+uint32_t thermometerGetValue();
+
+#endif /* THERMOMETER_H_ */