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Simply call USBD_BULK_Receive( hInst, &c, 1, -1 ); It returns 1, if you got a byte, It returns 0 if there is no data.
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The function USBD_BULK_GetNumBytesInBuffer() never triggers a read, it only check for bytes in the buffer. If you never call any read function, then the buffer will be always empty. Please use USBD_BULK_Receive(..., Timeout = -1) instead.