LED

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Revision as of 09:34, 10 July 2012 by FabienM (Talk | contribs) (New page: == The linux LED driver class == On recent kernel, linux have a led driver. This led can be driven from /sys/class/leds/ directory. For APF28Dev, the led is configurable under the direc...)

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The linux LED driver class

On recent kernel, linux have a led driver. This led can be driven from /sys/class/leds/ directory.

For APF28Dev, the led is configurable under the directory : 

 # cd /sys/class/leds/apfdev:green:user

Blinking

The blinking style can be selected with trigger file. By defaut on APF28Dev, Heartbeat is selected : 

# cat /sys/class/leds/apfdev:green:user/trigger 
none nand-disk mmc0 timer [heartbeat] backlight gpio default-on

Blinking style can be changed with echo command : 

# echo "nand-disk" > /sys/class/leds/apfdev:green:user/trigger

With this "nand-disk" option selected, the led will blink each time nand access occur (try with sync command to see it blinking).

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