max31855.py 文件源码

def read(self):
        '''Reads 32 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 32 bits
        for i in range(32):
            GPIO.output(self.clock_pin, GPIO.LOW)
            bytesin = bytesin << 1
            if (GPIO.input(self.data_pin)):
                bytesin = bytesin | 1
            GPIO.output(self.clock_pin, GPIO.HIGH)
        # Unselect the chip
        GPIO.output(self.cs_pin, GPIO.HIGH)
        # Save data
        self.data = bytesin