Posted on October 29, 2015 at 08:47Hi,
I am using STM32F051R8 eval board I am trying to read temperature sensor and internal voltage values but some times I am getting wrong ADC conversion values
void MX_ADC_Init(void)
{
ADC_ChannelConfTypeDef sConfig;
ADC_AnalogWDGConfTypeDef AnalogWDGConfig;
/**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc.Instance = ADC1;
hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC;
hadc.Init.Resolution = ADC_RESOLUTION12b;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
hadc.Init.EOCSelection = EOC_SINGLE_CONV;
hadc.Init.LowPowerAutoWait = DISABLE;
hadc.Init.LowPowerAutoPowerOff = DISABLE;
hadc.Init.ContinuousConvMode = ENABLE;
hadc.Init.DiscontinuousConvMode = DISABLE;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.DMAContinuousRequests = DISABLE;
hadc.Init.Overrun = OVR_DATA_PRESERVED;
HAL_ADC_Init(&hadc);
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
HAL_ADC_ConfigChannel(&hadc, &sConfig);
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_VREFINT;
HAL_ADC_ConfigChannel(&hadc, &sConfig);
}
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
value++;
if(value == 1)
{
buf[0] = HAL_ADC_GetValue(hadc);
}
else if(value == 2)
{
buf[1] = HAL_ADC_GetValue(hadc);
value =0;
}
int32_t calTemperatureVal(void)
{
int32_t temperature;
temperature = buf[0];
temperature = ((temperature* VDD_APPLI /VDD_CALIB) - (int32_t)*TEMP30_CAL_ADDR);
temperature = temperature * (int32_t)(110 -30);
temperature = temperature / ((int32_t)*TEMP110_CAL_ADDR - (int32_t)*TEMP30_CAL_ADDR);
temperature = temperature +30;
return temperature;
}
#stm32-stm32f0-adc
