Hello, I am uing STM32F103 MCU and I am having a small problem with the ADC. There is a 250 mV difference between the real voltage value on a pin and the value ADC gives me. When I measure the voltage on a pin it is 900 mV. But when I print out the ADC value it gives me a value 1150.
Here is how I configure and measure ADC:
int readVoltageValue (uint32_t channel){
/**Configure Regular Channel
*/
ADC_ChannelConfTypeDef sConfig;
sConfig.Channel = channel;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
//_Error_Handler(__FILE__, __LINE__);
}
HAL_ADC_Start(&hadc1);
HAL_ADC_PollForConversion(&hadc1,1000);
int adcValue = (int) HAL_ADC_GetValue(&hadc1);
return adcValue;
}
And this is when I call the ADC function:
Vout=(readVoltageValue(ADC_CHANNEL_3));
Everything looks fine. Actually ADC is also working but like I said there is 250 mV difference. What might be the reason behind that?
