kalipi.py 文件源码

def screen_on(retPage, backlightControl):

    if os.environ["KPPIN"] != "1":
        launch_bg=os.environ["MENUDIR"] + "launch-bg.sh"
        process = subprocess.call(launch_bg, shell=True)

    pygame.quit()
    if backlightControl == "3.5r":
        process = subprocess.call("echo '1' > /sys/class/backlight/soc\:backlight/brightness", shell=True)
    elif backlightControl == "4dpi-24":
        process = subprocess.call("echo '80' > /sys/class/backlight/24-hat-pwm/brightness", shell=True)
    else:
        backlight = GPIO.PWM(18, 1023)
        backlight.start(100)
        GPIO.cleanup()
    if os.environ["KPPIN"] == "1":
        page=os.environ["MENUDIR"] + "menu-pin.py"
        args = [page, retPage]
    else:
        page=os.environ["MENUDIR"] + retPage
        args = [page]

    os.execvp("python", ["python"] + args)

# Turn screen off