Possibility not to align the choice of one-shot vs. circular mode in ADC and DMA?

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STM32G474
In RM0440 Rev 8, page 641, I learned the "DMACFG bit" in ADC configuration register (ADC_CFGR) set the ADC in either one-shot mode or circular mode. But there is a separate mode setting in DMA which is also one shot vs circular mode. If we use DMA to ransfer ADC result to memory, I am wondering whether this is a legitimate use case that we set the ADC and DMA in different mode?

STM32CubeMX

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Imen.DBest answer

ST Technical Moderator

Hello @pxia.1 ,

We can put them in different modes: ADC one-shot and DMA circular. In this case it will be one-shot.

So, if you need circular, you need both to be circular. Otherwise, it will be one-shot.

If only one is circular, it will not be circular.

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