STM32H750 Type V - reading the Internal temperature sensor (ADC3)
Hello,
I am trying to read the internal temperature sensor - but the value I get does not change at all (when I change the ambient temperature).
I have the same raw value from ADC - 0xe41 -- >, which convert to -142.19 C (?!)
I assume that something is wrong here.
the question is:
1 . Does this sensor work correctly on the H750 type V ? if so -
what am I doing wrong in the code ?
here the code :
main function --> read_internal_temperature_sensor
void MX_ADC3_Init(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
/** Common config
*/
hadc3.Instance = ADC3;
hadc3.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV128;
hadc3.Init.Resolution = ADC_RESOLUTION_12B;
hadc3.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc3.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc3.Init.LowPowerAutoWait = DISABLE;
hadc3.Init.ContinuousConvMode = DISABLE;
hadc3.Init.NbrOfConversion = 2;
hadc3.Init.DiscontinuousConvMode = DISABLE;
hadc3.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc3.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DR;
hadc3.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc3.Init.LeftBitShift = ADC_LEFTBITSHIFT_NONE;
hadc3.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc3) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
sConfig.OffsetSignedSaturation = DISABLE;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
sConfig.Rank = ADC_REGULAR_RANK_2;
sConfig.SamplingTime = ADC_SAMPLETIME_387CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
{
Error_Handler();
|
}
MSD_status_t read_internal_temperature_sensor (uint16_t* adc_converted)
{
MSD_status_t status = MSD_ST_OK;
uint16_t adc_value;
float adc_value_converted_f;
adc_set_channel(&hadc3, &adc3_sConfig_RunTime, ADC_CHANNEL_TEMPSENSOR);
adc_value = adc_read(&hadc3);
adc_value_converted_f = adjust_to_celcius(adc_value);
*adc_converted = (uint16_t)(adc_value_converted_f);
return status;
}
MSD_status_t adc_set_channel(ADC_HandleTypeDef* in_p_adc, ADC_ChannelConfTypeDef* in_p_adc_conf, uint32_t in_ul_channel)
{
MSD_status_t status = MSD_ST_OK;
in_p_adc_conf->Channel = in_ul_channel;
if (HAL_ADC_ConfigChannel(in_p_adc, in_p_adc_conf) != HAL_OK)
{
status = MSD_ST_NOT_READY;
}
return status;
}
#define ADC_WAIT_END_OF_GROUP_CONVER_MSEC ((uint32_t) (1500UL / portTICK_RATE_MS))
uint16_t adc_read(ADC_HandleTypeDef* in_p_adc)
{
uint32_t val;
HAL_ADC_Start(in_p_adc);
if (HAL_ADC_PollForConversion(in_p_adc, ADC_WAIT_END_OF_GROUP_CONVER_MSEC) == HAL_OK)
{
val = HAL_ADC_GetValue(in_p_adc);
}
else
{
return -1;
}
return (uint16_t)val;
}
// 0.0198f = (110-30)/4033 <-- TS_CAL2 = 0x4013 TS_CAL1 =0X3052 ,TS_CAL2_TEMP =110, //TS_CAL1_TEMP =30
//
// TS_CAL2_TEMP - TS_CAL1_TEMP
//Temperature in °C ( ) = ------------------------------ × ( READ DATA - TS_CAL1) + TS_CAL1_TEMP
// TS_CAL2 - TS_CAL1
float adjust_to_celcius(uint16_t in_us_value)
{
float temp = (float)(0.0198f*(in_us_value - 0x3052)) + 30.0f;
return (temp*100);
}
