REQ_SIZE
urb->setup_packet, REQ_SIZE);
usbd_xfer_set_frame_len(xfer, 0, REQ_SIZE);
urb->setup_packet, REQ_SIZE);
parm->bufsize += REQ_SIZE; /* SETUP message */
if (parm->bufsize <= REQ_SIZE) {
if (xfer->max_data_length < REQ_SIZE) {
xfer->max_data_length -= REQ_SIZE;
usbd_xfer_set_frame_offset(xfer, REQ_SIZE, 1);
usbd_xfer_set_frame_offset(xfer, REQ_SIZE, 1);