L07: DMA channel request change

[LCE]

Heyho,

I just found that the STM32L07 has too few DMA channels for my application, so I probably might need to use a DMA channel for two peripherals - surely not at the same time.

So when switching the DMA request to another peripheral via DMA1->CSELR, is it enough to disable the DMA channel (DMA1_Channeln->CCR &= ~DMA_CCR_EN (no transfer active)), then set CSELR new?

 

Thanks in advance!

[waclawek.jan]

Yes, but I’d also disable/enable the DMA at its source, e.g. TIMx_DIER.xxDE, USART_CR3.DMAT/DMAR, etc.

JW

[mƎALLEm]

+ Need also to clear flags in IFCR of the previous transfer.