Prescaler and Samplingtime setting of Analogue to Digiter Convertor with DMA

[MYu.1]

I am currently using the STM32-G070RB.

The current problem is that ADC_DMA sometimes works and sometimes doesn't, depending on the Clock Prescaler setting and the SamplingTime setting.

I would like to know why ADC_DMA is affected by the Clock Prescaler setting and the SamplingTime setting.

And I'm curious how to do it when calculating the settings to work.

[waclawek.jan]

> sometimes works and sometimes doesn't

What do you mean by "doesn't work"?

JW

[MYu.1]

Clock Prescaler - Asynchronous clock mode divided by 6 , Sampling Time - 39.5 -> I can get adc value.

Clock Prescaler - Asynchronous clock mode divided by 4 , Sampling Time - 39.5 -> I can't get adc value.

Clock Prescaler - Asynchronous clock mode divided by 6 , Sampling Time - 19.5 -> I can't get adc value.( HAL_ADC_Start_DMA() is not working )