Diff: main.cpp

Revision:

0:dfdf46225b14

Child:

1:09a5e83ea18f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Mar 27 21:46:25 2016 +0000
@@ -0,0 +1,53 @@
+// Reading internal temperature sensor of STM32F103RB chip
+
+#include "mbed.h"
+
+// See STM32F103x datasheet, chapter 5.3.19 "Temperature sensor characteristics", Table 50. "TS characteristics"
+const float         AVG_SLOPE   = 4.3E-03;
+const float         V25         = 1.43;
+const float         ACD_TO_VOLT = 3.3 / 4096;
+
+Serial              pc(USBTX, USBRX);
+DigitalOut          myled(LED1);
+ADC_HandleTypeDef   hadc1;
+float               temp;
+uint16_t            adcValue;
+
+/* ADC1 init function */
+extern "C"
+void MX_ADC1_Init(void) {
+    ADC_ChannelConfTypeDef  sConfig;
+
+    /**Common config
+        */
+    hadc1.Instance = ADC1;
+    hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
+    hadc1.Init.ContinuousConvMode = DISABLE;
+    hadc1.Init.DiscontinuousConvMode = DISABLE;
+    hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
+    hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
+    hadc1.Init.NbrOfConversion = 1;
+    HAL_ADC_Init(&hadc1);
+
+    /**Configure Regular Channel
+        */
+    sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
+    sConfig.Rank = 1;
+    sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
+    HAL_ADC_ConfigChannel(&hadc1, &sConfig);
+}
+
+int main() {
+    MX_ADC1_Init();
+    while(HAL_ADCEx_Calibration_Start(&hadc1) != HAL_OK);
+
+    while(1) {        
+        myled = !myled;
+        HAL_ADC_Start(&hadc1);
+        while(HAL_ADC_PollForConversion(&hadc1, 0) != HAL_OK);
+        adcValue = HAL_ADC_GetValue(&hadc1);
+        temp = (V25 - adcValue * ACD_TO_VOLT) / AVG_SLOPE + 25.0f;
+        pc.printf("temp = %3.1f%cC\n", temp, 176);
+        wait_ms(1000);
+   }
+}