USBVC_OPEN
ASSERT((usbvcp->usbvc_drv_state & USBVC_OPEN) == 0);
if ((usbvcp->usbvc_drv_state & USBVC_OPEN) != 0) {
usbvcp->usbvc_drv_state |= USBVC_OPEN;
usbvcp->usbvc_drv_state &= ~USBVC_OPEN;
usbvcp->usbvc_drv_state &= ~USBVC_OPEN;