stm32 HAL SPI with DMA

[sortovaritu]

Is it possible to use HAL_SPI_Transmit together with HAL_SPI_Transmit_DMA??
For example:
HAL_SPI_Transmit(SPI2, arr_1, 0x04, 1);
HAL_SPI_Transmit_DMA(SPI2, arr_2 , 0x04);

My issue that the second command(HAL_SPI_Transmit_DMA(SPI2, arr_2 , 0x04) does not send any data to SPI

[SiliconWizard]

You may want to check the error codes returned by those two functions, that may help.

[newbrain]

It's definitely possible.

Of course, the transmission from one call must be completed before the other one (or the same!) can be invoked.
If not, the HAL will return an error (HAL_BUSY).

The DMA setup might be wrong, can you show us your code?

[Berni]

You often need to set up the DMA separately for things to work, could need certain interrupts set up and there might be other limitations with what memory areas the DMA can access. If any of it goes wrong you might get a hard fault, nothing happening or the driver becoming confused.

You most definitely have to watch out when using both that the DMA is done with its work before you try to do anything else. There are functions you can call to find out or check the contents of the SPI driver struct.

And sometimes the HAL just doesn't do exactly what you want, in that case you can sometimes copy paste an existing HAL function and modify it so that it works in the way you want.

[sortovaritu]

I found a Solution:
DMA should be initiated before SPI initiation.