stm32F10x MSC with SPI Flash (W25Q256) problem

[thonsha]

Hello,

I am trying make a USB device MSC.

It works fine with SD card, but I want both SD card and flash.( I set max_lun to 1.)

I have wrote the SPI_Flash_Write and  SPI_Flash_Read that can be called by MAL_Write and MAL_Read.

It seems work fine cause I can format the flash disk on my computer and put files into the disk.

However, everytime I turn off my board and turn on it, it ask me to format the disk again and again.

I have searched many solutions. Someone said that I should use FATFS f_mkfs to format first.

I tried but not worked , is that true or any other problem I missed ? 

Regards,

thonsha

[FBL]

Hi @thonsha 

Would you provide some code snippets for these functions " SPI_Flash_Write and  SPI_Flash_Read that can be called by MAL_Write and MAL_Read" .

I suggest you as a first step to isolate the problem and start with an example FATFS with micro SD card. Then we can move and use it as MSC Device.

[Tesla DeLorean]

>>It seems work fine cause I can format the flash disk on my computer and put files into the disk.

Seems a bit subjective, given it's not actually retaining content. The caching on the host will hide a lot of ills.

Perhaps use 4KB sectors on the FLASH, and test the read returns the same data that was written. Have a big enough sector buffer, and MAX_SS is adequate.

You should only need to format the content once, either from the Host or via f_mkfs()