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Problem with USBHS and FATFS - STM32F407

Question asked by Ahmed Emad el-deen on Apr 26, 2017

I'm using STM32f407 with USB 3300 ULPI module, and try to copy file from SD card using SDIO to flash memory using fatfs. 

The drive mounted and file opened successfully, but while reading or writing data on flash memory f_read or f_write fails and returns disk_err although first calls of f_read/write work properly. ?