Posted on October 03, 2016 at 11:36Hi,
I want to read the internal temperature of STM32F429II. I am using stm32F4 peripheral library V1.4.4. Below is my code,
// Init
static HAL_StatusTypeDef ADCx_Init(void)
{
hAdc.Instance = ADC1;
if (HAL_ADC_DeInit(&hAdc) != HAL_OK)
{
return HAL_ERROR;
}
if (HAL_ADC_GetState(&hAdc) == HAL_ADC_STATE_RESET)
{
hAdc.Init.ClockPrescaler = ADC_Prescaler_Div2;
hAdc.Init.Resolution = ADC_RESOLUTION_12B;
hAdc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hAdc.Init.ScanConvMode = DISABLE;
hAdc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hAdc.Init.ContinuousConvMode = ENABLE;
hAdc.Init.NbrOfConversion = 1;
hAdc.Init.DiscontinuousConvMode = DISABLE;
hAdc.Init.NbrOfDiscConversion = 1;
hAdc.Init.ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
hAdc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hAdc.Init.DMAContinuousRequests = DISABLE;
if (HAL_ADC_Init(&hAdc) != HAL_OK)
{
return HAL_ERROR;
}
hAdc_AdcChannelConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
hAdc_AdcChannelConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
hAdc_AdcChannelConfig.Rank = 1;
hAdc_AdcChannelConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hAdc, &hAdc_AdcChannelConfig) != HAL_OK)
{
return HAL_ERROR;
}
}
return HAL_OK;
}
//Clock
// in stm32f4xx_hal_msp.c
void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{
__HAL_RCC_ADC_CLK_ENABLE();
}
// Call this function at some interval from main to read temperature
uint16_t sampleInput(void)
{
float TemperatureValue = 0;
uint16_t value = 0;
if (HAL_ADC_Start(&hAdc) != HAL_OK)
{
printf(''HAL_ADC_Start fail\r\n'');
return HAL_ERROR;
}
if (HAL_ADC_PollForConversion(&hAdc, HAL_MAX_DELAY) != HAL_OK)
{
printf(''HAL_ADC_PollForConversion fail\r\n'');
return HAL_ERROR;
}
if((HAL_ADC_GetState(&hAdc) & HAL_ADC_STATE_REG_EOC) != HAL_ADC_STATE_REG_EOC)
{
printf(''HAL_ADC_GetState fail\r\n'');
return HAL_ERROR;
}
value = HAL_ADC_GetValue(&hAdc);
printf(''HAL_ADC_GetValue [%x] [%d]\r\n'', value, value);
TemperatureValue = value&0x0fff;// 12 bit result
TemperatureValue *= 3300;
TemperatureValue /= 0xfff; //Reading in mV
TemperatureValue /= 1000.0; //Reading in Volts
TemperatureValue -= 0.760; // Subtract the reference voltage at 25�C
TemperatureValue /= .0025; // Divide by slope 2.5mV
TemperatureValue += 25.0; // Add the 25�C
printf(''Temp = [%f]\r\n'', TemperatureValue);
}
I am stuck here in ''HAL_ADC_PollForConversion'' function. Please help me out of this.
#adc #!stm32 #internal-temperature-sensor
