STM32F411 Blackpill + eMMC (Raspikey) + FatFS

[chasej]

Hi,

I have a STM32F411CEU6 Blackpill that I'm wanting to interface to an eMMC (Raspikey to be exact via SD/MMC reader) with FATFS. I have confirmed that the connections with the SD/MMC reader are fine with a read/write test to an SD card in a different STM Project. I have a duplicated project but orietated for eMMC where I've changed the FATFS configuration to be User-defined and understand that I need to implement

- USER_initialise, USER_status, USER_Read, USER_Write and USER_ioctl

Can someone shed light or provide examples of the user_diskio.c functions for MMC/eMMC?

Thanks,

J

[KDJEM.1]

Hello @chasej and welcome to the community;

May Watermark demonstration can help you to start with e-mmc.  In this example, the e-mmc is used to mount a fatfs filesystem.

This example has been tested with STMicroelectronics STM32L4P5G-DISCO evaluation board (MB1535) and can be easily tailored to any other supported device and development board.

I hope this help you.

Thank you.

Kaouthar

[chasej · Accepted solution]

Hi Kaouthar,

Yes, thank you for this.

I did find a similar example as well that helped me out considerably and have gotten the eMMC working with the STM32F4 BlackPill. The USER_diskio source and header are attached.

Thanks,

J