philips ARM7 lpc2103 的AD口接光敏电阻，来探测LCD背光是否打开，并通过UART0，打印出AD转换后光米电阻测试的电压值，并输出LCD给光的开关状态-philips ARM7 lpc2103 I received the photo resistors AD to detect LCD backlight is turned on, and UART0, print optical AD conversion of the voltage meter to test the