Revision as of 19:10, 5 September 2012

IGEP COM MODULE Tutorial Guides

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Overview

This is the 2/3 chapter of IGEP COM MODULE Tutorial Guide.

We will learn some basic tasks.

What can I do

Handle the gpio-LED's

Basic

Log into IGEP COM MODULE (for example via SSH, as shown in the previous chapter), and run the following commands to turn LED's on:

echo 1 > /sys/devices/platform/leds-gpio/leds/d210\:green/brightness
echo 1 > /sys/devices/platform/leds-gpio/leds/d210\:red/brightness
echo 1 > /sys/devices/platform/leds-gpio/leds/d440\:green/brightness
echo 1 > /sys/devices/platform/leds-gpio/leds/d440\:red/brightness

You can turn them down using the same command and write '0' instead of '1'.

Know more

IGEP COM MODULE LED's are controlled with it's platform device at /sys/devices/platform/leds-gpio/leds/

If you want to trigger the leds you can enable this mode and select the trigger source (none by default) to: mmc0, mmc1, timer, heartbeat and default-on.

To enable any of this modes you just have to change a parameter in the directory of the led you want to control. You can see all the possibilities using the instruction 'cat':

$   cat /sys/devices/platform/leds-gpio/leds/d210\:green/trigger

[none] mmc0 mmc1 timer heartbeat default-on

In the example above, we have checked the status of the trigger in led D210:green. Mode 'none' is selected.

To change it, for example, to the timer mode you can use 'echo':

echo timer > /sys/devices/platform/leds-gpio/leds/d210\:green/trigger

In this case, we have set the trigger to the 'timer' mode. Now you can set the time for what the led is ON and the time it is OFF using:

echo 250 > /sys/devices/platform/leds-gpio/leds/d210\:green/delay_on
echo 750 > /sys/devices/platform/leds-gpio/leds/d210\:green/delay_off

Now the selected led is configured with a timer consisting of 250 miliseconds ON and 750 miliseconds OFF.

From How to handle the gpio-LED

IGEP COM MODULE Tutorial Guides

1/3 - Getting started with IGEP COM MODULE 2/3 - What can I do with IGEP COM MODULE 3/3 - Start developing with IGEP COM MODULE IGEP COM MODULE Product Page IGEP COM MODULE Hardware manual