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STM32F0xx ADC oversampling with DMA

Question asked by Gerhard on Jun 22, 2016
It is recommended to use DMA for multiple ADC channels, and I spent too much time trying to switch between channels manually.
So I used STM32CubeMX to get DMA working for ADC1_Channel_0 and Channe_1

I want to take x16 samples on each Channel_0/1, and then get the average.
Is there some flag / interrupt that I can check. does the EOC still work under DMA?

How do I know which channel the sample belongs to?
3) Is there a way to tell the DMA mechanism to take 16 samples, (alternating between CH_0 / CH_1, while storing it to the ADC_Buffer [] array?\

Any help appreciated