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Logann123321
Logann123321
Associate II
November 13, 2019
Question

SPI dma example receiving only 0

  • November 13, 2019
  • 3 replies
  • 868 views

Hi I am using stmh7 nucleo board and trying the spi dma example in NUCLEO-H743ZI folder, but thr transfer only gives me 0 in the aRxBuffer, anyone has had this problem before? I am not sure how to solve this

Thanks!

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3 replies

waclawek.jan
waclawek.jan
Super User
November 13, 2019

Did you follow exactly the readme, how the hardware connections ought to be done?

Or do it yourself. do one step at a time. First set up SPI and try a polled implementation first, loop back MOSI into MISO and observe data and clock using an oscilloscope. Then gradually mix in DMA.

JW

Logann123321
Logann123321Author
Associate II
November 16, 2019

Hi thanks for the reply I finally am getting things back from mosi, but I am still not getting the right values, it looks like the data is shifted to the right by 1 bit, when I am sending 50 it is receiving only 25, and I believe I have cpha and cpol correct, any idea why that might be?

Thanks

DRabi
DRabi
Associate
November 20, 2019

Hi @Logann123321​  !

Recently tried SPI1 on same board. Without DMA.

After some time having strange problems with MOSI, decided to try SPI3 on the same board, again without DMA.

Worked without any kind of problem.

Could it be used for you as walk around?

Dan

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