FatFs with SPI Flash porting on STM32 MCU

[voyvoda .]

I would like to implement FatFs on my STM32 MCU with SPI Flash, W25Q16JV.

Is there a sample code for this? How can I port it ?

[Tesla DeLorean]

So take your code you have for read/write/erase of the SPI FLASH, and integrate that with the DISKIO layer of FatFs

[voyvoda .]

Hello Clive,

I generated a sample code by CubeMX and selected fatfs as "User-Defined". There is file, "user_diskio.c" file which is generated bu CubeMX.

Will I put my code into the below function. In addition, there is read and write function available. However there is no erase function.

Diskio_drvTypeDef USER_Driver =

{

 USER_initialize,

 USER_status,

 USER_read, 

#if _USE_WRITE

 USER_write,

#endif /* _USE_WRITE == 1 */  

#if _USE_IOCTL == 1

 USER_ioctl,

#endif /* _USE_IOCTL == 1 */

};

[Tesla DeLorean]

You have to manage the access to the flash so that FatFs can read/write 512 byte sector(s). You'd need to deal with the erase operation, and read-erase-write where a sector spanned a block on the underlying device.

[voyvoda .]

I can only erase as little as 4K sector on the flash memory, but you say 512 byte.

I will do it something like below. Do you think that it is OK.

DRESULT disk_read(

BYTE drv, /* Physical drive nmuber(0..) */

BYTE *buff, /* Data buffer to store read data */

DWORD sector, /* Sector address(LBA) */

BYTE count /* Number of sectors to read(1..255) */

)

{

int i;

for(i=0;i<count;i++)

{

W25X_Read_Sector(sector,buff);

sector ++;

buff += FLASH_SECTOR_SIZE;

}

return RES_OK;

}

DRESULT disk_write(

BYTE drv, /* Physical drive nmuber(0..) */

const BYTE *buff, /* Data to be written */

DWORD sector, /* Sector address(LBA) */

BYTE count /* Number of sectors to write(1..255) */

)

{

int i;

for(i=0;i<count;i++)

{ W25X_Erase_Sector(sector);

W25X_Write_Sector(sector,(u8*)buff);

sector ++;

buff += FLASH_SECTOR_SIZE;

}

return RES_OK;

}

[voyvoda .]

FLASH_SECTOR_SIZE = 4096

[Ogulcan Ariyurek]

Hi voyvoda,

I'm dealing with the same problem right now.

Did you able to achive porting the FatFS to the SPI flash through your way?

Thanks,

Ogulcan

[voyvoda .]

Oğulcan Hocam Selamlar,

Ekli dosyadan faydalanabilirsin. İşini görecektir. iyi çalışmalar.

[Ogulcan Ariyurek]

Teşekkürler :)

[ACice]

Açıkçası ilgili vermiş olduğunuz dosya sistemi üzerinde çalışıyorum ancak ilk initialize mkfs ve mount ile ilgili kısımları geçiyorum. hatta disk size ve free space verilerini de alıyorum. Ancak restart sonrası bu durum bozuluyor. disk büyüklüklerini okumuyor. nedenini bir türlü bulamadım. başınıza geldiyse dönebilirseniz memnun olurum. Daha önce daha eski sürümünü microsd kart sürmek için başarı ile kullanmıştım. şimdi nedense bir türlü olmadı. Teşekkürler

[doganayserhatt]

Merhaba ilgili çalışmanızı tamamladınız mı?

[embedded4ever]

Merhabalar , @ACice​  , @Ogulcan Ariyurek​  , @voyvoda .​ , FatFs'i , Serial Flash ile kullanırken , yaşadığınız dezavantaj olarak nitelendirebileceğiniz bir durum oldu mu ? @ACice​bahsettiğiniz soruna karşı bir çözüm oluşturabildiniz mi?

Teşekkürler ,

Volkan

[PDChauhan]

Hello @voyvoda . (Community Member)​ , I have implemented diskio.c file for my QPSI flash of 4MBytes with 4096 sector size. f_mkfs returns OK, but f_mount returns FR_NO_FILESYSTEM.

I could not open your given attachment "stm32_spi_flash_fatfs".

May you again share your attachment ?

Also, I have doubt for

     case GET_BLOCK_SIZE :

in IOCTL.

Should the return value be "BLOCK_SIZE" (which will be in bytes) or should it be value of how many sectors erased in which case value would be '1' ? I asked this as the comment for this case is

" /* Get erase block size in unit of sector (DWORD) */"

I have read the raw data from flash for the sector #63 where f_mkfs writes and data seems to be OK (FAT header)

Thanks and Regards.