EP0_IN_DATA_PHASE
dev->ep0state = EP0_IN_DATA_PHASE;
if (likely(dev->ep0state == EP0_IN_DATA_PHASE
case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR etc */
case EP0_IN_DATA_PHASE:
udc->ep0state = EP0_IN_DATA_PHASE;
case EP0_IN_DATA_PHASE: