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STM32F4 : Usb flash drive and fatfs

Question asked by bund.mikael on Mar 3, 2016

My 4GB usb flash drive works perfectly fine with FATFS and STM32Cube. However, my program is not able to make a read/write operation on the other usb keys.

Actually, f_mount function returns "FR_OK" and I can create a directory on my drive. The problem occurs when my program tries a write operation. The error code is "FR_NOT_READY" and it comes from disk_initialize which returns "STA_NOINIT".

I have tested my program with 6 different pen drives of 2, 4, 8 and 16 GB but the only ones which work are the 4GB ones. I can't say there is a link but I have currently no idea to solve this issue.

Any help would be appreciated.