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STM32 F303RE USB DMA conflict

Question asked by Laurikainen.Jaakko on Jun 11, 2016
Latest reply on Jun 14, 2016 by ForumSTM32.ForumSTM3

I started using USB CDC device in my project which uses F303RE controller. I struggled to get it working until I realized that it is most likely using same DMA channel that I'm using for SPI3 access. I'm using DMA2 channels 1 and 2 for that.

Where can I find information of which DMA channel the USB CDC device is using, and is it possible to disable it? Most likely I don't want to disable it as it would eat up the processor cycles. I tried searching from ST documentation and the CDC device source code but couldn't find the used DMA channel. Only reference that I found from ST documentation is that it uses some internal DMA in HS mode.