onewire.py 文件源码

def __init__(self, slave=None, family=0, extra=None):
        Bus.__init__(self, "ONEWIRE", "/sys/bus/w1/devices/w1_bus_master1/w1_master_slaves", os.O_RDONLY)
        if self.fd > 0:
            os.close(self.fd)
            self.fd = 0

        self.family = family
        if  slave != None:
            addr = slave.split("-")
            if len(addr) == 1:
                self.slave = "%02x-%s" % (family, slave)
            elif len(addr) == 2:
                prefix = int(addr[0], 16)
                if family > 0 and family != prefix:
                    raise Exception("1-Wire slave address %s does not match family %02x" % (slave, family))
                self.slave = slave
        else:
            devices = self.deviceList()
            if len(devices) == 0:
                raise Exception("No device match family %02x" % family)
            self.slave = devices[0]

        loadExtraModule(extra)