STM32H743 BDMA channel for SAI4 not described in Manual

[A Maq]

I am trying to program BDMA of STM32H743 using Nucleo board to perform DMA Peripheral to Memory operation .

What I have found a bit difficult is that I could not see any information on Reference Manual , Datasheet or on forum for the mapping information of basic DMA (BDMA) channels for SAI4 block A peripheral of STM32H7 MCU.

What I can see is the only Request ID mapping for DMAMUX2 which is 15 in this case.

Can anyone please help me to identify which channel should I use if I am trying to use SAI4_a BDMA?

[A Maq · Accepted solution]

I have found channel for SAI-4_a of STM32H743 as channel_1 from an example provided by ST but still could not find the information for mapping in any of the document I have so far seen.

[waclawek.jan]

And then it's you who says to which DMA channel will this request be directed, by setting the number of these requests to DMAMUX2_CxCR.DMAREQ_ID for the selected channel x.

Read the DMAMUX chapter in the RM.

JW

[A Maq]

Hi Jan,

Thanks for your response . Looking at the image you provided it only tells DMAMux2 input as 15 for Sai4_a but no mapping showed for input 15 to channel. It says DMAMux2 , channel 0 to 7 connected to BDMA channel 0 to 7​.

Where is input 15 mapped to channel that bit is confusing as putting in on channel 1 seems to be working. ​

[waclawek.jan]

As I've said above, you map it in by setting a chosen DMAMUX2_CxCR.DMAREQ_ID to 15.

JW