Hello @RMarz.1
In order to create a driver for your eMMC device, you will need to write your own low-level hardware interface functions to communicate with the device. These functions will typically include things like sending commands to the device, reading and writing data blocks, and managing the device's hardware interface (e.g. configuring the clock speed and I/O pins).
Once you have written these hardware interface functions, you can create a driver structure that contains function pointers to these low-level functions. This driver structure can then be passed to the FATFS middleware using the FATFS_LinkDriver() function.
Here's an example of what the driver structure might look like:
#include "ffconf.h"
#include "diskio.h"
/* eMMC hardware interface functions */
DSTATUS eMMC_disk_initialize(BYTE pdrv);
DSTATUS eMMC_disk_status(BYTE pdrv);
DRESULT eMMC_disk_read(BYTE pdrv, BYTE *buff, LBA_t sector, UINT count);
DRESULT eMMC_disk_write(BYTE pdrv, const BYTE *buff, LBA_t sector, UINT count);
DRESULT eMMC_disk_ioctl(BYTE pdrv, BYTE cmd, void *buff);
/* eMMC driver structure */
const Diskio_drvTypeDef eMMC_Driver = {
eMMC_disk_initialize,
eMMC_disk_status,
eMMC_disk_read,
eMMC_disk_write,
eMMC_disk_ioctl
};
In this example, the eMMC_disk_initialize(), eMMC_disk_status(), eMMC_disk_read(), eMMC_disk_write(), and eMMC_disk_ioctl() functions are the low-level hardware interface functions for the eMMC device. These functions should be implemented to communicate with your specific eMMC device.
The eMMC_Driver structure contains function pointers to these low-level functions, and is defined using the Diskio_drvTypeDef structure provided by the FatFs middleware.
Once you have defined this driver structure, you can pass it to the FATFS_LinkDriver() function as follows:
FATFS fs;
if (FATFS_LinkDriver(&eMMC_Driver, "0") == 0) {
if (f_mount(&fs, "0:", 1) == FR_OK) {
// File system is mounted on the eMMC device
}
}
In this example, the eMMC_Driver structure is passed to the FATFS_LinkDriver() function, along with a drive number ("0" in this case). If the function returns 0, the driver is successfully linked with the FATFS middleware.
After linking the driver, you can use the f_mount() function to mount the file system on the eMMC device, as shown in the example above.
