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kim_dy
Associate II
July 6, 2023
Question

How to use 'HAL_SPI_TransmitReceive_DMA' & 'HAL_SPI_Transmit_DMA' for spi, but error in 'devID'

  • July 6, 2023
  • 3 replies
  • 8488 views

i'm using 'HAL_SPI_TransmitReceive_DMA' , but error in 'devid'

'HAL_SPI_TransmitReceive_DMA'  -> The path to use this function is

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If I use the commented 'HAL_SPI_TransmitReceive' function, the 'devID' value is 0xdeca0310 (normal value)
If you use the 'HAL_SPI_TransmitReceive_DMA' function, the 'devID' value comes out as 0x0(error).

DMA settings are as follows.

kim_dy_6-1688605424895.png

I must solve this problem/
Let me know if there is any information you need to solve the problem.

This topic has been closed for replies.

3 replies

TDK
TDK
July 6, 2023

HAL_SPI_TransmitReceive_DMA starts a transmission which runs in the background. You need to wait for it to complete before you can pull up the CS pin and read the data.

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    K
    kim_dyAuthor
    Associate II
    July 10, 2023

    I'm sorry, but what CS pin are you talking about?

    Andrew Neil
    Andrew Neil
    Super User
    February 21, 2024
    @kim_dy wrote:

    I'm sorry, but what CS pin are you talking about?

    "CS" = "Chip Select"

    AndrewNeil_1-1708510800361.png

     

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    L
    Lachezar
    Associate
    February 21, 2024

    Lachezar_0-1708507458430.png

    Wait DMA to finish before you set NSS(CS) pin. 

      Andrew Neil
      Andrew Neil
      Super User
      February 21, 2024

      Please use this button to properly post source code - not as images:

      AndrewNeil_0-1708510610942.png

       

       

      A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
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