pyRPiRTC.py 文件源码

def _w_byte(self, byte):
        """
        Write byte to the chip.

        :param byte: byte value
        :type byte: int
        """
        # data pin is now output
        GPIO.setup(self._data_pin, GPIO.OUT)
        # clock the byte to chip
        for _ in range(8):
            GPIO.output(self._clk_pin, GPIO.LOW)
            time.sleep(self.CLK_DELAY)
            # chip read data on clk rising edge
            GPIO.output(self._data_pin, byte & 0x01)
            byte >>= 1
            GPIO.output(self._clk_pin, GPIO.HIGH)
            time.sleep(self.CLK_DELAY)