pn53x.py 文件源码

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

        # perform a communication line test
        if self.chipset.diagnose("line", "nfcpy") is not True:
            raise IOError(errno.EIO, os.strerror(errno.EIO))

        self._vendor_name = "NXP"
        self._device_name = self.chipset.ic

        RWT_WTX = {'PN531': (14, 7), "PN532": (14, 7), "PN533": (8, 1)}
        rwt, wtx = RWT_WTX[self.chipset.ic]

        # set ATR_RES timeout: 102.4 ms, non-DEP: 51.2 ms)
        atr_res_to = 11 # T = 100 * 2^(x-1) s
        non_dep_to = 10 # T = 100 * 2^(x-1) s
        log.debug("ATR_RES timeout: {0:7.1f} ms".format(0.1*2**(atr_res_to-1)))
        log.debug("non-DEP timeout: {0:7.1f} ms".format(0.1*2**(non_dep_to-1)))
        atr_res_to = chr(atr_res_to); non_dep_to = chr(non_dep_to)
        self.chipset.rf_configuration(0x02, chr(11) + atr_res_to + non_dep_to)

        # retries for ATR_REQ, PSL_REQ, target activation
        log.debug("set retries: ATR_REQ=2 PSL_REQ=1 PassiveTarget=3")
        self.chipset.rf_configuration(0x05, "\x02\x01\x03")