Zoltan Hudak / Mbed 2 deprecated Internal_Temperature_F103RB

Reading temperature sensor built into STM32F103RB chips

Dependencies:   mbed

main.cpp@0:dfdf46225b14, 2016-03-27 (annotated)

Committer:
hudakz
Date:
Sun Mar 27 21:46:25 2016 +0000
Revision:
0:dfdf46225b14
Child:
1:09a5e83ea18f
Initial revision

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hudakz 0:dfdf46225b14 1 // Reading internal temperature sensor of STM32F103RB chip
hudakz 0:dfdf46225b14 2
hudakz 0:dfdf46225b14 3 #include "mbed.h"
hudakz 0:dfdf46225b14 4
hudakz 0:dfdf46225b14 5 // See STM32F103x datasheet, chapter 5.3.19 "Temperature sensor characteristics", Table 50. "TS characteristics"
hudakz 0:dfdf46225b14 6 const float AVG_SLOPE = 4.3E-03;
hudakz 0:dfdf46225b14 7 const float V25 = 1.43;
hudakz 0:dfdf46225b14 8 const float ACD_TO_VOLT = 3.3 / 4096;
hudakz 0:dfdf46225b14 9
hudakz 0:dfdf46225b14 10 Serial pc(USBTX, USBRX);
hudakz 0:dfdf46225b14 11 DigitalOut myled(LED1);
hudakz 0:dfdf46225b14 12 ADC_HandleTypeDef hadc1;
hudakz 0:dfdf46225b14 13 float temp;
hudakz 0:dfdf46225b14 14 uint16_t adcValue;
hudakz 0:dfdf46225b14 15
hudakz 0:dfdf46225b14 16 /* ADC1 init function */
hudakz 0:dfdf46225b14 17 extern "C"
hudakz 0:dfdf46225b14 18 void MX_ADC1_Init(void) {
hudakz 0:dfdf46225b14 19 ADC_ChannelConfTypeDef sConfig;
hudakz 0:dfdf46225b14 20
hudakz 0:dfdf46225b14 21 /**Common config
hudakz 0:dfdf46225b14 22 */
hudakz 0:dfdf46225b14 23 hadc1.Instance = ADC1;
hudakz 0:dfdf46225b14 24 hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
hudakz 0:dfdf46225b14 25 hadc1.Init.ContinuousConvMode = DISABLE;
hudakz 0:dfdf46225b14 26 hadc1.Init.DiscontinuousConvMode = DISABLE;
hudakz 0:dfdf46225b14 27 hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hudakz 0:dfdf46225b14 28 hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hudakz 0:dfdf46225b14 29 hadc1.Init.NbrOfConversion = 1;
hudakz 0:dfdf46225b14 30 HAL_ADC_Init(&hadc1);
hudakz 0:dfdf46225b14 31
hudakz 0:dfdf46225b14 32 /**Configure Regular Channel
hudakz 0:dfdf46225b14 33 */
hudakz 0:dfdf46225b14 34 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
hudakz 0:dfdf46225b14 35 sConfig.Rank = 1;
hudakz 0:dfdf46225b14 36 sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
hudakz 0:dfdf46225b14 37 HAL_ADC_ConfigChannel(&hadc1, &sConfig);
hudakz 0:dfdf46225b14 38 }
hudakz 0:dfdf46225b14 39
hudakz 0:dfdf46225b14 40 int main() {
hudakz 0:dfdf46225b14 41 MX_ADC1_Init();
hudakz 0:dfdf46225b14 42 while(HAL_ADCEx_Calibration_Start(&hadc1) != HAL_OK);
hudakz 0:dfdf46225b14 43
hudakz 0:dfdf46225b14 44 while(1) {
hudakz 0:dfdf46225b14 45 myled = !myled;
hudakz 0:dfdf46225b14 46 HAL_ADC_Start(&hadc1);
hudakz 0:dfdf46225b14 47 while(HAL_ADC_PollForConversion(&hadc1, 0) != HAL_OK);
hudakz 0:dfdf46225b14 48 adcValue = HAL_ADC_GetValue(&hadc1);
hudakz 0:dfdf46225b14 49 temp = (V25 - adcValue * ACD_TO_VOLT) / AVG_SLOPE + 25.0f;
hudakz 0:dfdf46225b14 50 pc.printf("temp = %3.1f%cC\n", temp, 176);
hudakz 0:dfdf46225b14 51 wait_ms(1000);
hudakz 0:dfdf46225b14 52 }
hudakz 0:dfdf46225b14 53 }