Hello friends ;
We have a datalogger based on stm32f4 discovery ; we log the data in external flash disck 8GB ( scan disck ) ; we noticed that about 20% of the usb discs we used don't work .
STM32f4 detect the usb ; but file system cant read data or open file or write data ., but the same usb work good when we put to PC .
Maybe some of you had this issue before so I would be thankful if you could help; I was debugging for few days but could not find the solution ; I am not sure if it it a usb timing problem or the fat32 library problem .
Could you guide me to solve it please ?
Thank you in advanced .