pyRPiRTC.py 文件源码

def __init__(self, clk_pin=11, data_pin=13, ce_pin=15):
        # init GPIO
        # no warnings
        GPIO.setwarnings(False)
        # use safer pin number (avoid GPIO renumber on each Pi release)
        GPIO.setmode(GPIO.BOARD)
        # set GPIO pins
        self._clk_pin = clk_pin
        self._data_pin = data_pin
        self._ce_pin = ce_pin
        # CLK and CE (sometime call RST) pin are always output
        GPIO.setup(self._clk_pin, GPIO.OUT, initial=GPIO.LOW)
        GPIO.setup(self._ce_pin, GPIO.OUT, initial=GPIO.LOW)
        # turn off WP (write protect)
        self._start_tx()
        self._w_byte(0x8e)
        self._w_byte(0x00)
        self._end_tx()
        # charge mode is disabled
        self._start_tx()
        self._w_byte(0x90)
        self._w_byte(0x00)
        self._end_tx()