stm32f7 SAI1B DMA2 stream 5 and 0 conflict with SDMMC2 stream 0 and 5 ????

[benyBoy]

Hi,

stm32f7 

SAI1B DMA2 stream 5 and 0 conflict with SDMMC2 stream 0 and 5 ????

I need to record data to and playback from SDMMC2 with DMA to and from SAI1B.

SDMMC2 uses both stream 0 and stream 5.

DMA2_Stream5_IRQHandler

DMA2_Stream0_IRQHandler

The peripherals are on different channels.

can write my own IRQHandlers to resolve the conflict or can there only be one peripheral per stream on DMA1 and DMA2 ?

I have managed to move some USART and SPI to DMA1 to free up some streams but this conflict leaves me stuck!

Would much appreciate any guidance.

[Tesla DeLorean]

One channel selectable per stream. Single device active at a time.

You could perhaps use a mutex to arbitrate ownership of the stream, but it is not a task I would envy, nor one I would be sure the outcome would work satisfactorily. ie I think it could be demonstrated to be able to be shared, but the sharing may not be sufficiently cooperative to be deemed successful in the final application.

[benyBoy]

maybe I can assign the same DMA stream to different devices and init / deInit them

when actually using them. for instance I guess I don't need to write to the SD card while I'm reading from it.

maybe just use an if statement in the IRQhandler ?

DMA2_Stream5_IRQHandler

{

if ( A == 1) {do one task}

else { do something other task}

}