STM32L4 Series: Using DMA to copy from Flash to SRAM

[raz3l]

Hi there,

Looking into the TRM for the STM32L412xx board, I was wondering if I could use a DMA to copy constant data from the Flash to SRAM. The system architecture block diagram connects the DMAs to Flash through the DCode path:

However, while reading the document it is explicit mentioned this for the DMA bus:

This bus connects the AHB master interface of the DMA to the BusMatrix.The targets of this bus are the SRAM1 and SRAM2, the AHB1 peripherals including the APB1 and APB2 peripherals, the AHB2 peripherals and the external memories through the QUADSPI.

This got me confused. Can someone explain these details? Is it possible or not to read from Flash using the DMAs, and if not, why is the DMA seems to be connected to the embedded Flash through the DCode path?

[TDK]

Yes, you can use the DMA to transfer from FLASH to SRAM.

https://github.com/STMicroelectronics/STM32CubeL4/blob/master/Projects/NUCLEO-L452RE/Examples/DMA/DMA_FLASHToRAM/readme.txt

[raz3l]

Thanks for the clarification!

[Issamos]

Hello @raz3l 

DMA can be use to send data to the SRAM to the flash. You can find here an exemple for the STM32L412kb-Nucleo.

Best regards.

II