LED: Difference between revisions

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(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...)
 
(Redirecting to GPIO LEDS)
 
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== The linux LED driver class ==
#REDIRECT [[GPIO_LEDS]]
 
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 :
 
<pre class="apf">
# cd /sys/class/leds/apfdev:green:user
</pre>
 
=== Blinking ===
 
The blinking style can be selected with ''trigger'' file. By defaut on APF28Dev, Heartbeat is selected :
 
<pre class="apf">
# cat /sys/class/leds/apfdev:green:user/trigger
none nand-disk mmc0 timer [heartbeat] backlight gpio default-on
</pre>
 
Blinking style can be changed with ''echo'' command :
 
<pre class="apf">
# echo "nand-disk" > /sys/class/leds/apfdev:green:user/trigger
</pre>
 
With this "nand-disk" option selected, the led will blink each time nand access occur (try with ''sync'' command to see it blinking).

Latest revision as of 14:35, 10 July 2012

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