pi_pwm.py 文件源码

def startPWM(self):
        """ Start the PWM output.
        """
        GPIO.output(self.fanpin, True)
        GPIO.output(self.enapin, True)
        GPIO.output(self.enbpin, True)
        GPIO.output(self.inapin, True)
        GPIO.output(self.inbpin, False)

        # Setup PWM and DMA channel 0
        self.p.start(0)
        self.dutycycle = 0