hello, i am using the STM32L073 for adc reading.
And want to use the async clocks for the dc voltage reading. so i dont need a high speed clock.
The problem is when i tested the async clocks on adc , the measurement time was sometimes(30~40%) different from the sampling rate time. but if i used the pclk ,the measurement time is same as the sampling rate time. is it because i used the async clocks?
I am using the HAL library for measuring the adc polling.
HAL_ADCEx_Calibration_Start
HAL_ADC_ConfigChannel
HAL_ADC_PollForConversion
HAL_ADC_GetValue
this is my adc parameter.
// Configure ADC
AdcHandle.Init.OversamplingMode = DISABLE;
AdcHandle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV256;
AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
AdcHandle.Init.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
AdcHandle.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
AdcHandle.Init.ContinuousConvMode = ENABLE;
AdcHandle.Init.DiscontinuousConvMode = DISABLE;
AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T6_TRGO;
AdcHandle.Init.DMAContinuousRequests = DISABLE;
AdcHandle.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
AdcHandle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
AdcHandle.Init.LowPowerAutoWait = DISABLE;
AdcHandle.Init.LowPowerFrequencyMode = ENABLE;
AdcHandle.Init.LowPowerAutoPowerOff = DISABLE;
