SPI DMA Correct Implementation

[Linkpad]

Hi, I am trying to use DMA in my project for SPI and noticed there are 2 type definitions as below:-

 

 

SPI_HandleTypeDef hspi1;
DMA_HandleTypeDef hdma_spi1_tx;

 

 

Which one do I need to use for SPI transmission as I am having problems using 'hspi1' as below:-

 

 

HAL_SPI_Transmit_DMA(&hspi1, "Test",sizeof"Test");

HAL_SPI_Transmit_DMA(&hdma_spi1_tx, "Test",sizeof"Test");

 

 

 I just wasn't sure which handle was the correct to use...

[STTwo-32]

Hello @Linkpad 

I suggest you to take a look at the following example to understand how the spi dma configuration works exactly. 

Best Regards.

STTwo-32 

[AScha.3]

afaik you need it to do this way:

HAL_DMA_Init(&hdma_spi1_tx);
HAL_SPI_Transmit_DMA(&hspi1, "Test",sizeof"Test");

 

[Linkpad]

Hi,

Thanks for the explanation I now understand!