transport.py 文件源码

def write(self, frame, timeout=0):
        if self.usb_out is not None:
            log.log(logging.DEBUG-1, ">>> %s", hexlify(frame))
            try:
                ep_addr = self.usb_out.getAddress()
                self.usb_dev.bulkWrite(ep_addr, bytes(frame), timeout)
                if len(frame) % self.usb_out.getMaxPacketSize() == 0:
                    self.usb_dev.bulkWrite(ep_addr, b'', timeout)
            except libusb.USBErrorTimeout:
                raise IOError(errno.ETIMEDOUT, os.strerror(errno.ETIMEDOUT))
            except libusb.USBErrorNoDevice:
                raise IOError(errno.ENODEV, os.strerror(errno.ENODEV))
            except libusb.USBError as error:
                log.error("%r", error)
                raise IOError(errno.EIO, os.strerror(errno.EIO))