transport.py 文件源码

def _PYUSB0_write(self, frame):
        if self.usb_out is not None:
            log.debug(">>> " + str(frame).encode("hex"))
            try:
                self.usb_dev.bulkWrite(self.usb_out, frame)
                if len(frame) % 64 == 0: # must end bulk transfer
                    self.usb_dev.bulkWrite(self.usb_out, '')
            except self.usb.USBError as error:
                if error.message == "Connection timed out":
                    ETIMEDOUT = errno.ETIMEDOUT
                    raise IOError(ETIMEDOUT, os.strerror(ETIMEDOUT))
                else:
                    log.error("{0!r}".format(error))
                    raise IOError(errno.EIO, os.strerror(errno.EIO))