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

[kim_dy]

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

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

 

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.

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

[TDK]

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.

[kim_dy]

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

[Andrew Neil]

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@kim_dy wrote:

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

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"CS" = "Chip Select"

 

[Lachezar]

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

[Andrew Neil]

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