Zoltan Hudak / Mbed 2 deprecated Internal_Temperature_F103RB

Reading temperature sensor built into STM32F103RB chips

Dependencies:   mbed

main.cpp@1:09a5e83ea18f, 2016-03-28 (annotated)

Committer:
hudakz
Date:
Mon Mar 28 07:02:30 2016 +0000
Revision:
1:09a5e83ea18f
Parent:
0:dfdf46225b14
Child:
2:bd6594739176
Updated

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 1:09a5e83ea18f 5 // STM32F103x datasheet:
hudakz 1:09a5e83ea18f 6 // 5.3.19 "Temperature sensor characteristics"
hudakz 1:09a5e83ea18f 7 // Table 50. "TS characteristics", Page 80
hudakz 0:dfdf46225b14 8 const float AVG_SLOPE = 4.3E-03;
hudakz 0:dfdf46225b14 9 const float V25 = 1.43;
hudakz 0:dfdf46225b14 10 const float ACD_TO_VOLT = 3.3 / 4096;
hudakz 0:dfdf46225b14 11
hudakz 0:dfdf46225b14 12 Serial pc(USBTX, USBRX);
hudakz 0:dfdf46225b14 13 DigitalOut myled(LED1);
hudakz 0:dfdf46225b14 14 ADC_HandleTypeDef hadc1;
hudakz 0:dfdf46225b14 15 float temp;
hudakz 0:dfdf46225b14 16 uint16_t adcValue;
hudakz 0:dfdf46225b14 17
hudakz 0:dfdf46225b14 18 /* ADC1 init function */
hudakz 0:dfdf46225b14 19 extern "C"
hudakz 0:dfdf46225b14 20 void MX_ADC1_Init(void) {
hudakz 0:dfdf46225b14 21 ADC_ChannelConfTypeDef sConfig;
hudakz 0:dfdf46225b14 22
hudakz 0:dfdf46225b14 23 /**Common config
hudakz 0:dfdf46225b14 24 */
hudakz 0:dfdf46225b14 25 hadc1.Instance = ADC1;
hudakz 0:dfdf46225b14 26 hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
hudakz 0:dfdf46225b14 27 hadc1.Init.ContinuousConvMode = DISABLE;
hudakz 0:dfdf46225b14 28 hadc1.Init.DiscontinuousConvMode = DISABLE;
hudakz 0:dfdf46225b14 29 hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hudakz 0:dfdf46225b14 30 hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hudakz 0:dfdf46225b14 31 hadc1.Init.NbrOfConversion = 1;
hudakz 0:dfdf46225b14 32 HAL_ADC_Init(&hadc1);
hudakz 0:dfdf46225b14 33
hudakz 0:dfdf46225b14 34 /**Configure Regular Channel
hudakz 0:dfdf46225b14 35 */
hudakz 0:dfdf46225b14 36 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
hudakz 0:dfdf46225b14 37 sConfig.Rank = 1;
hudakz 0:dfdf46225b14 38 sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
hudakz 0:dfdf46225b14 39 HAL_ADC_ConfigChannel(&hadc1, &sConfig);
hudakz 0:dfdf46225b14 40 }
hudakz 0:dfdf46225b14 41
hudakz 0:dfdf46225b14 42 int main() {
hudakz 0:dfdf46225b14 43 MX_ADC1_Init();
hudakz 0:dfdf46225b14 44 while(HAL_ADCEx_Calibration_Start(&hadc1) != HAL_OK);
hudakz 0:dfdf46225b14 45
hudakz 0:dfdf46225b14 46 while(1) {
hudakz 0:dfdf46225b14 47 myled = !myled;
hudakz 1:09a5e83ea18f 48 // STM32F103xx Reference Manual:
hudakz 1:09a5e83ea18f 49 // 11.10 Temperature sensor
hudakz 1:09a5e83ea18f 50 // Reading the temperature, Page 235
hudakz 0:dfdf46225b14 51 HAL_ADC_Start(&hadc1);
hudakz 1:09a5e83ea18f 52 while(HAL_ADC_PollForConversion(&hadc1, 1000000) != HAL_OK);
hudakz 0:dfdf46225b14 53 adcValue = HAL_ADC_GetValue(&hadc1);
hudakz 0:dfdf46225b14 54 temp = (V25 - adcValue * ACD_TO_VOLT) / AVG_SLOPE + 25.0f;
hudakz 0:dfdf46225b14 55 pc.printf("temp = %3.1f%cC\n", temp, 176);
hudakz 0:dfdf46225b14 56 wait_ms(1000);
hudakz 0:dfdf46225b14 57 }
hudakz 0:dfdf46225b14 58 }