WhyCan Forum(哇酷开发者社区)

leds {
		compatible = "gpio-leds";

		blue_led {
			label = "licheepi:blue:usr";
			gpios = <&pio 6 1 GPIO_ACTIVE_LOW>; /* PG1 */
		};

		green_led {
			label = "licheepi:green:usr";
			gpios = <&pio 6 0 GPIO_ACTIVE_LOW>; /* PG0 */
			default-state = "on";
		};

		red_led {
			label = "licheepi:red:usr";
			gpios = <&pio 6 2 GPIO_ACTIVE_LOW>; /* PG2 */
		};
	};

gpios = <&pio 6 1 GPIO_ACTIVE_LOW>; /* PG1 */

# ls /sys/class/leds/
licheepi:blue:usr   licheepi:green:usr  licheepi:red:usr

echo 1 > /sys/class/leds/licheepi\:green\:usr/brightness 

echo 0 > /sys/class/leds/licheepi\:green\:usr/brightness 

# ls /sys/class/leds/licheepi\:blue\:usr/
brightness      max_brightness  subsystem       uevent
device          power           trigger
# cat /sys/class/leds/licheepi\:blue\:usr/trigger 
[none] kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock mmc0 heartbeat default-on
这里可以看到当前的值为none，表示没有trigger，将其值改成heartbeat就可以看到闪烁了
# echo heartbeat > /sys/class/leds/licheepi\:blue\:usr/trigger