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USB MSC write problem

Question asked by guler.umit on Dec 29, 2015
Latest reply on Dec 30, 2015 by Clive One
Hi everyone,
I have some problem with my STM32F105RC board.for USB MSC application.
I can write usb stick perfectly but some usb is problem and I can not write. That's why 
USB always busy with something and I take a communication error from my modbus designed. I think, it is always here;
static void BSP_Delay(uint32_t nTime, uint8_t unit)
  BSP_delay = nTime;
  while(BSP_delay != 0);
so can you give me some advice??