XUSB_TESTMODE_OFFSET
udc->write_fn(udc->addr, XUSB_TESTMODE_OFFSET, 0);
XUSB_TESTMODE_OFFSET,
udc->write_fn(udc->addr, XUSB_TESTMODE_OFFSET, USB_TEST_J);
if ((udc->read_fn(udc->addr + XUSB_TESTMODE_OFFSET))
udc->write_fn(udc->addr, XUSB_TESTMODE_OFFSET, 0);