LED - Revision history

FabienM: Redirecting to GPIO LEDS

2012-07-10T13:35:19Z

Redirecting to GPIO LEDS

← Older revision		Revision as of 15:35, 10 July 2012
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	~~see~~ [[GPIO_LEDS]]		#REDIRECT [[GPIO_LEDS]]

Jorasse: Replacing page with 'see GPIO_LEDS'

2012-07-10T09:17:10Z

Replacing page with 'see GPIO_LEDS'

← Older revision		Revision as of 11:17, 10 July 2012
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	~~== The linux LED driver class ==~~		see [[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~~
	~~# cat /sys/class/leds/apfdev:green:user/trigger~~
	~~none [nand-disk] mmc0 timer heartbeat backlight gpio default-on~~
	~~</pre>~~

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

	~~=== Switch led with user button ===~~

	~~It is possible to switch led state using the APF28Dev user button. This button is seen as gpio17 (as seen under APF28Dev~~ [[~~datasheet~~]]~~) under Linux, then configure the led trigger as gpio :~~

	~~<pre class="apf">~~
	~~# echo "gpio" > /sys/class/leds/apfdev:green:user/trigger~~
	~~</pre>~~

	~~New config files are available :~~
	~~<pre class="apf">~~
	~~# ls /sys/class/leds/apfdev:green:user/~~
	~~brightness gpio power uevent~~
	~~desired_brightness inverted subsystem~~
	~~device max_brightness trigger~~
	~~</pre>~~

	~~Then the trigger gpio can be configured with ''gpio'' file :~~

	~~<pre class="apf">~~
	~~# echo 17 > gpio~~
	~~</pre>~~

	~~Then pushing the user switch will now commute the LED state.~~

	~~=== Links ===~~

	~~See the kernel documentation [http://www.mjmwired.net/kernel/Documentation/leds-class.txt Documentation/leds-class.txt] for more information about this driver.~~

FabienM: /* Switch led with user button */

2012-07-10T07:48:52Z

Switch led with user button

← Older revision		Revision as of 09:48, 10 July 2012
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	=== Switch led with user button ===		=== Switch led with user button ===

	It is possible to switch led state using the APF28Dev user button. This button is seen as gpio17 under Linux, then configure the led trigger as gpio :		It is possible to switch led state using the APF28Dev user button. This button is seen as gpio17 (as seen under APF28Dev [[datasheet]]) under Linux, then configure the led trigger as gpio :

	<pre class="apf">		<pre class="apf">

FabienM: /* Blinking */

2012-07-10T07:47:46Z

Blinking

@@ Line 27: / Line 27: @@
 With this "nand-disk" option selected, the led will blink each time nand access occur (try with ''sync'' command to see it blinking).
 === Links ===
 See the kernel documentation [http://www.mjmwired.net/kernel/Documentation/leds-class.txt Documentation/leds-class.txt] for more information about this driver.

FabienM at 07:37, 10 July 2012

2012-07-10T07:37:23Z

← Older revision		Revision as of 09:37, 10 July 2012
Line 27:		Line 27:

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

			=== Links ===

			See the kernel documentation [http://www.mjmwired.net/kernel/Documentation/leds-class.txt Documentation/leds-class.txt] for more information about this driver.

FabienM at 07:35, 10 July 2012

2012-07-10T07:35:52Z

← Older revision		Revision as of 09:35, 10 July 2012
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	<pre class="apf">		<pre class="apf">
	# echo "nand-disk" > /sys/class/leds/apfdev:green:user/trigger		# echo "nand-disk" > /sys/class/leds/apfdev:green:user/trigger
			# cat /sys/class/leds/apfdev:green:user/trigger
			none [nand-disk] mmc0 timer heartbeat backlight gpio default-on
	</pre>		</pre>

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

FabienM: 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...

2012-07-10T07:34:59Z

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...

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 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).