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sima2
sima2
Associate III
April 23, 2018
Question

Move data into GPIOx_BSRR by DMA?

  • April 23, 2018
  • 1 reply
  • 652 views
Posted on April 23, 2018 at 20:33

I'm using SMT32F429.

I want to move 32 bit data from memory into GPIOx_BSRR by DMA and use a timer as trigger.

I tried to setup DMA1 Stream 4 channel 1 (TIM7_UP). And I setup Timer7. But I end upp getting Stream 4 transfer error interrupt flag set. DMA_SxNDTR only counts down one time.

And now I read that it is only DMA2 that can write to GPIO registers. Can this be why I fail?  Where can I confirm that informaton?

#stm32 #dma
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1 reply

Tesla DeLorean
Tesla DeLorean
Guru
April 23, 2018
Posted on April 23, 2018 at 22:33

You need to use DMA2 based on the memories you expect to be touching, it is covered in the Reference Manual if you pay attention to the details and notes.

It is a function of how the assorted buses connect, and inter-connect, with each other, basically a plumbing issue.

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