I2C.py 文件源码

def ReadNack(self):
        GPIO.setup(self.SDA, GPIO.IN)
        readbuffer =0
        for i in range(8):
            GPIO.output(self.SCL, GPIO.HIGH)
            self.tick(2)
            readbuffer |= (GPIO.input(self.SDA)<< 7) >> i
            GPIO.output(self.SCL, GPIO.LOW)
            self.tick(2)

        GPIO.setup(self.SDA, GPIO.OUT)
        GPIO.output(self.SDA, GPIO.HIGH)
        GPIO.output(self.SCL, GPIO.HIGH)
        self.tick(2)
        GPIO.output(self.SCL, GPIO.LOW)
        GPIO.output(self.SDA, GPIO.LOW)
        self.tick(2)
        return readbuffer