MU3D_EP0_STATE_TX
case MU3D_EP0_STATE_TX:
mtu->ep0_state = MU3D_EP0_STATE_TX;
case MU3D_EP0_STATE_TX:
case MU3D_EP0_STATE_TX: /* control-IN data */
if (mtu->ep0_state == MU3D_EP0_STATE_TX)
case MU3D_EP0_STATE_TX: