How to use DMA for fatfs(SPI:SPI0)

[y001]

Hello!

As the title suggests, I want to know how to use DMA with fatfs.

// <e> SPI0_ENABLED-Enable SPI0 instance
// ================================================ ==========
#ifndef SPI0_ENABLED
#define SPI0_ENABLED 1
#endif
// <q> SPI0_USE_EASY_DMA-Use EasyDMA
 

#ifndef SPI0_USE_EASY_DMA
#define SPI0_USE_EASY_DMA 1
#endif

It is defined like this, but now is fatfs using DMA?

It takes 18ms to write 512 bytes with f_write when writing to the SD card.

Thank you!

[Jørgen Holmefjord]

Hi,

Yes, these configurations should be sufficient for the SPI master driver to use EasyDMA SPIM peripheral for SPI master instance 0. If you also have set APP_SDCARD_SPI_INSTANCE to 0, this instance should be used by FatFS.

Best regards,
Jørgen

[y001]

Thank you for your reply.

“APP_SDCARD_SPI_INSTANCE” is set to “0”.
Also, app_sdcard.c uses that instance, so you can probably use DMA.
Thank you very much.