Multiple DMA Requests for the same DMA Stream

Ahmed Elzoughby · ‎2019-06-19

The STM32H7 series has come with the concept of DMAMUX which is different from the older series. it looks awesome and better than the dma request mapping table.

But I wonder if it can route multiple dma requests to the same dma stream or not?

To be more clear, I'm using STM32H743, and I want to configure TIM1 to trigger DMA1_Stream0 on both TIM1_CH1 and TIM1_UP requests. Is it possible?

Ahmed Elzoughby · ‎2019-06-20

Another question out of curiosity, Is it possible trigger multiple dma streams using the same request?

waclawek.jan · ‎2019-06-21

And also the mux selection is exclusive (i.e. only one request line can be selected at a time for one DMAMUX channel), so you can't triger one stream from multiple requests (unless they are merged before DMAMUX in internal fabric, which as far as I can see they are not).

Disclaimer: I don't use H7.

JW

Ahmed Elzoughby · ‎2019-06-21

Yes I've read this note before, but was not clear to me.

Any way, It seems that you are right and what I want to do is not possible.

I have to try some work around solutions.

Thanks for your reply.