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Update, so long as I only call the USBD_BULK_Receive( hInst, NULL, 0, -1 ) once in the loop (till I later receive something) then USBD_BULK_GetNumBytesInBuffer() will actually return the number of bytes in the OUT buffer that are waiting to be read, then I call USBD_BULK_Read() to get them and reset a flag to allow the process to restart..

Thank you Rainer for the info. I have tried the following an none give me an indication that there is a byte or more available to read: USBD_BULK_Receive( hInst, NULL, 0, -1 ); USBD_BULK_Receive( hInst, NULL, 1, -1 ); USBD_BULK_Receive( hInst, &c, 0, -1 ); My workaround has been using a 1mS timeout so not to waste too much time with USB_BULK_Read(), but from what I can understand from the manual is that this can cause loss of data if a timeout expires before a transaction has completed.. Still n…

My project periodically will have the target checking for potential data coming from the host without making a blocking call, though USBD_BULK_ReadAsync() or USBD_BULK_ReadOverlapped() could be used I first tested the API by using the function USBD_BULK_GetNumBytesInBuffer(). This was made by a simple modification to the USB_BULK_Test.c code provided for the NXP 1060 EVK. Is there some kind of initialization missing or should this function return 1 (one) after the corresponding eval code for the…