Re: [Gumstix-users] I want to light an LED!

[<cod...@gm...>]

I've been struggling with turning LEDs on and off myself the past few days.
I have LEDs connected to GPIOs 170, 127, and 128.  I have all 3 LEDs enabled
in the pin mux configuration of u-boot in the overo.h header.  If I remember
correctly, 2 of the GPIOs are pull type up (PTU) and the other one is pull
type down (PTD).  I have all 3 pins exported in /sys/class/gpio, and can
echo a 1 or a 0 to each of the pins, and 'cat gpioX/value' returns the
appropriate number.  However, the LEDs do not change at all.  One of the
LEDs, I believe GPIO128, is constantly on no matter what I set the gpio to
in the filesystem.

What is the appropriate setting for LED pins in the pin mux configuration?
Should they be a certain mode, pull type up/down?

On Sat, Feb 6, 2010 at 6:24 AM, Victhor <vic...@gm...> wrote:

> It's rather easy, I didn't even know that it would be like that :)
> X is the GPIO port number. Just type in those commands and your led
> should light up :)
> echo X > /sys/class/gpio/export
> echo out > /sys/class/gpio/gpioX/direction # This should make the LED
> light up. At least it does on my Palo43
> echo 1 > /sys/class/gpio/gpioX/value # On my Palo43, it turns the LED
> connected to that port turn off
> echo 0 > /sys/class/gpio/gpioX/value # Turns it on again
> If you don't want to use that GPIO port again, use the first command,
> replacing export with unexport.
> > Hello all.
> >
> > I feel rather stupid. Let me explain: I have an Overo Air, and a Tobi.
> > I figured that I'd be able to get some document that says "LED 3 is
> > tied to port X" or something similar, which would then allow me to
> > light those LEDs (I have experience writing RTOS's, so I'm used to a
> > little lower level than Linux). Of course, I could find no such
> > document, nor could I find anything on Google to help me with this.
> > The LEDs are pretty teeny, but it does look like I have a few that are
> > not being used. Can someone please explain how I light them? I'm very
> > sorry, I feel like this should be easy, but I can't figure it out.
> > Thank you very much!
> >
> >      Kyle Fazzari
> >
> >
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