[Voyage-linux] About GPIO support

[Stéphane Acounis]

Le Thu, 10 Feb 2011 08:21:21 -0500
Jon Meek <meekjt at gmail.com> a écrit:

> Stéphane - When you implement the power off button please post the
> details!
> 

Ohhhh very simple, it works quite well. I have an Alix 3D2 board and
the switch is located near the USB connector (S1 written on the PCB).
Just solder two wires and connect them to a normally opened push button.

I have wrote a simple bash script (power-button):

------------------------------------------------------------------------------

#!/bin/bash

while true; do
        button=`od -x  /dev/cs5535_gpio24 | cut -c 11-12 | head -1` 
        if [ $button == "30" ]; then
                sleep 3
                button=`od -x  /dev/cs5535_gpio24 | cut -c 11-12 | head -1`
		if [ $button == "30" ]; then
                        beep -f 1000 -r 2 -n -r 5 -l 10 --new 
                        /sbin/poweroff
                else
                        exit
                fi
        fi
                sleep 1
done

------------------------------------------------------------------------------

and installed a line in the root's crontab:

@reboot /data/Scripts/power-button

Then pressing more than 3 seconds on the switch will do a clean halt of
the board.

If someone has a better and more efficient way to monitor the switch, please share.

-- 
Stéphane ACOUNIS
SUBATECH Nantes - Service d'Électronique
Tél: 02-51-85-84-28  06-64-62-99-20

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