[Solved] Where can you find the h7 DMA request map?

[angus schmaloer]

I want to use DMA on my stm32h7 board, but i can find which channel is used for what protocol ect.

[Tesla DeLorean]

Doesn't the Reference Manual have a huge list?

https://www.st.com/content/ccc/resource/technical/document/reference_manual/group0/c9/a3/76/fa/55/46/45/fa/DM00314099/files/DM00314099.pdf/jcr:content/translations/en.DM00314099.pdf

[Tesla DeLorean]

[angus schmaloer]

it has this;

I want to use the SAI controller to read data from the AD7768 adc, so im looking at the sai1a_dma, and i can see its on the 87th mux input.

and also another list, but i cant make much practical sence of it.

On the f4 you have a clear table with each channel and stream, but i cant find anything like that of the h7.

[angus schmaloer]

Yes, i saw this list, and i saw that the sai1a_dma is on signal 87 of the dma mux, but to which channel does that translate?

[waclawek.jan]

To which you assign it in DMAMUX. That's what DMAMUX is for.

If you don't want any of the fancy stuff, simply write 87 into say DMAMUX1_C0CR.DMAREQ_ID, and then your SAI_A DMA triggers stream 0 of DMA1.

Disclaimer, I don't use 'H7.

JW

[Tesla DeLorean · Accepted solution]

You get to make that association, there is less of the channel/stream rigor as there was with earlier STM32 designs.

The DMA unit to use mainly depending on the busing and peripheral bank you're using.

[angus schmaloer]

aaah thnx, at first i thought there were preassigned dma channels for peripherals (like, i thought, the f4).

[angus schmaloer]

thanks