1、c有2组LED：D3和D4，每组LED都有蓝，绿，红三种颜色。LED位置如下图所示：
2、JN-mini5728 LED位置与操作方式
3、点亮LEDroot@am57xx-evm:~# echo 1 > /sys/class/leds/status_usr0/brightnessroot@am57xx-evm:~# echo 1 > /sys/class/leds/status_usr1/brightnessroot@am57xx-evm:~# echo 1 > /sys/class/leds/status_usr2/brightnessroot@am57xx-evm:~# echo 1 > /sys/class/leds/status_usr3/brightnessroot@am57xx-evm:~# echo 1 > /sys/class/leds/status_usr4/brightnessroot@am57xx-evm:~# echo 1 > /sys/class/leds/status_usr5/brightness
4、关闭LEDroot@am57xx-evm:~# echo 0 > /sys/class/leds/status_usr0/brightnessroot@am57xx-evm:~# echo 0 > /sys/class/leds/status_usr1/brightnessroot@am57xx-evm:~# echo 0 > /sys/class/leds/status_usr2/brightnessroot@am57xx-evm:~# echo 0 > /sys/class/leds/status_usr3/brightnessroot@am57xx-evm:~# echo 0 > /sys/class/leds/status_usr4/brightnessroot@am57xx-evm:~# echo 0 > /sys/class/leds/status_usr5/brightness