led.py 文件源码

def turn_on(gpio_num, freq, dc):
    global g_led_pwm

#    print('turn_on: %d, %d, %d' % (gpio_num, freq, dc))

    if not g_led_pwm.has_key(gpio_num):
        g_led_pwm[gpio_num] = {}
        GPIO.setup(gpio_num, GPIO.OUT)
        g_led_pwm[gpio_num]['obj'] = GPIO.PWM(gpio_num, freq)

    g_led_pwm[gpio_num]['obj'].start(0)
    g_led_pwm[gpio_num]['obj'].ChangeFrequency(freq)
    g_led_pwm[gpio_num]['obj'].ChangeDutyCycle(dc)
    g_led_pwm[gpio_num]['freq'] = freq
    g_led_pwm[gpio_num]['dc'] = dc
    g_led_pwm[gpio_num]['status'] = 'on'
    status_notify()