pi_pwm.py 文件源码

def changeDutyCycle(self, duty):
        """ Set the PWM duty cycle in percent.

            @param float duty: PWM duty cycle 0 < duty < 100
        """
        self.dutycycle = 0
        if duty >= 0:
            GPIO.output(self.inapin, True)
            GPIO.output(self.inbpin, False)
        else:
            GPIO.output(self.inapin, False)
            GPIO.output(self.inbpin, True)
        self.p.ChangeDutyCycle(abs(duty))