acr122.py 文件源码

def __init__(self, transport):
        self.transport = transport

        # read ACR122U firmware version string
        reader_version = self.ccid_xfr_block(bytearray.fromhex("FF00480000"))
        if not reader_version.startswith("ACR122U"):
            log.error("failed to retrieve ACR122U version string")
            raise IOError(errno.ENODEV, os.strerror(errno.ENODEV))

        if int(chr(reader_version[7])) < 2:
            log.error("{0} not supported, need 2.x".format(reader_version[7:]))
            raise IOError(errno.ENODEV, os.strerror(errno.ENODEV))

        log.debug("initialize " + str(reader_version))

        # set icc power on
        log.debug("CCID ICC-POWER-ON")
        frame = bytearray.fromhex("62000000000000000000")
        transport.write(frame)
        transport.read(100)

        # disable autodetection
        log.debug("Set PICC Operating Parameters")
        self.ccid_xfr_block(bytearray.fromhex("FF00517F00"))

        # switch red/green led off/on
        log.debug("Configure Buzzer and LED")
        self.set_buzzer_and_led_to_default()

        super(Chipset, self).__init__(transport, logger=log)