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

kim_dy
Associate II

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.

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

6 REPLIES 6
TDK
Guru

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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kim_dy
Associate II

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

kim_dy
Associate II

In addition, do I need to use HAL_DMA_Start as well?

Lachezar
Associate II

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

Andrew Neil
Evangelist

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

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@kim_dy wrote:

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


"CS" = "Chip Select"

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