I have a Gertboard rev1 and I was wondering if there was an easy way to make the pushbuttons serve as a restart button and/or a halt button.
I have managed to open up buttons.c (from the gertboard_sw package) which loops and checks the button GPIO status ... and I can determine which pushbutton is pressed but then I'm not sure how to reboot/halt the system in C. I'd like to do 'shutdown -r now' if one button is pressed, and 'shutdown -h now' if another is pressed.
This would be extremely useful as I am running a headless RasPi.
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Gert van Loo
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Re: Restart/Shutdown with Gertboard Pushbuttons
The simplest is to execute the command using 'system'.
system("This command is executed");
In your case:
system("sudo shutdown -r now");
But you need a program always running in a loop to detect the buttons.
(You had better put a 'sleep' in the loop else it uses 100% CPU time)
There is interrupt code for the GPIO pins which is a more elegant solution.
I don't know where that is.
system("This command is executed");
In your case:
system("sudo shutdown -r now");
But you need a program always running in a loop to detect the buttons.
(You had better put a 'sleep' in the loop else it uses 100% CPU time)
There is interrupt code for the GPIO pins which is a more elegant solution.
I don't know where that is.
Re: Restart/Shutdown with Gertboard Pushbuttons
great thank you!!!!