usbd_get_ep_by_addr
ep = usbd_get_ep_by_addr(udev, ep_index | ep_dir);
ep = usbd_get_ep_by_addr(f->udev, u.popen->ep_no);
ep = usbd_get_ep_by_addr(udev, req->wIndex[0]);
usbd_get_ep_by_addr(udev, ep), do_stall);
ep = usbd_get_ep_by_addr(udev, ea_val);
struct usb_endpoint *usbd_get_ep_by_addr(struct usb_device *udev, uint8_t ea_val);