STM32F4 DMA vs F1 DMA

[zexx86]

Posted on May 14, 2015 at 15:51

Hello,

I am migrating code from F103RBT6 to F415RGT6.The problem is only in DMA part that it seems as a dead code so obviously something is bad there.Here you can see source code for both F1 and F4:http://pastebin.com/QcJBc9NXBasically USART is working, but just DMA for sending the data does not work.So the problem is most probably in dma_send() function.There are different versions of STD Libraries for both F1 and F4 so here is the biggest problem. For F1 DMA works very well.Can somebody tell me what I am missing there? Thank you!

[Tesla DeLorean]

Posted on May 14, 2015 at 16:43

USART2 TX is DMA1 Stream6 Channel4, other random selections won't work. See RM0090 ''DMA1 request mappings''

[zexx86]

Posted on May 14, 2015 at 18:18

Thank you very much!

It works very well now.