transport.py 文件源码

def _PYUSB0_read(self, timeout):
        if self.usb_inp is not None:
            try:
                frame = self.usb_dev.bulkRead(self.usb_inp, 300, timeout)
            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))
            else:
                frame = bytearray(frame)
                log.debug("<<< " + str(frame).encode("hex"))
                return frame