When getting the value from the internal temperature sensor, the value is not stable.
I am testing it inside the office, and the chip surface temperature is 25 degrees Celsius.
The code outputs the internal temperature sensor value every second, and it is output as follows.
temp 334
temp 333
temp 334
temp 334
temp 334
temp 68
temp 333
temp 68
temp 68
temp 333
temp 333
temp 334
temp 68
temp 68
temp 68
temp 334
temp 334
temp 68
temp 334
I'm not sure if the init code or import code is wrong.
```C
// ADc Init Code
static void MX_ADC_Init(void)
{
/* USER CODE BEGIN ADC_Init 0 */
ADC1->CHSELR = ADC_CHSELR_CHSEL16; /* (1) */
ADC1->SMPR |= ADC_SMPR_SMP_0 | ADC_SMPR_SMP_1 | ADC_SMPR_SMP_2; /* (2) */
ADC->CCR |= ADC_CCR_TSEN; /* (3) */
/* USER CODE END ADC_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC_Init 1 */
/* USER CODE END ADC_Init 1 */
/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc.Instance = ADC1;
hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc.Init.Resolution = ADC_RESOLUTION_12B;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc.Init.LowPowerAutoWait = DISABLE;
hadc.Init.LowPowerAutoPowerOff = DISABLE;
hadc.Init.ContinuousConvMode = ENABLE;
hadc.Init.DiscontinuousConvMode = DISABLE;
hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.DMAContinuousRequests = DISABLE;
hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
if (HAL_ADC_Init(&hadc) != HAL_OK)
{
Error_Handler();
}
/** Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_2;
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
/** Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC_Init 2 */
/* USER CODE END ADC_Init 2 */
}
```
```C
// print ADC Temp Code
void printTemp(void)
{
// ADC1->CR |= ADC_CR_ADSTART;
// while ((ADC1->ISR & ADC_ISR_EOC) == 0)
// {
// };
int32_t temperature; /* will contain the temperature in degrees Celsius */
temperature = (((int32_t)ADC1->DR * VDD_APPLI / VDD_CALIB) - (int32_t)*TEMP30_CAL_ADDR);
temperature = temperature * (int32_t)(110 - 30);
temperature = temperature / (int32_t)(*TEMP110_CAL_ADDR - *TEMP30_CAL_ADDR);
temperature = temperature + 30;
DEBUG_PRINT_RN("temp %d\r\n", (int32_t)temperature);
}
```
Reference link
