max6675.py 文件源码

def read(self):
        '''Reads 16 bits of the SPI bus & stores as an integer in self.data.'''
        bytesin = 0
        # Select the chip
        GPIO.output(self.cs_pin, GPIO.LOW)
        # Read in 16 bits
        for i in range(16):
            GPIO.output(self.clock_pin, GPIO.LOW)
            time.sleep(0.001)
            bytesin = bytesin << 1
            if (GPIO.input(self.data_pin)):
                bytesin = bytesin | 1
            GPIO.output(self.clock_pin, GPIO.HIGH)
        time.sleep(0.001)
        # Unselect the chip
        GPIO.output(self.cs_pin, GPIO.HIGH)
        # Save data
        self.data = bytesin