Re: How is the au1000_gpio char driver used?

["s c" <steve.carren@gmail.com>]

On 9/26/06, Freddy Spierenburg <freddy@dusktilldawn.nl> wrote:
> Hi Steve,
>
> On Tue, Sep 26, 2006 at 11:39:41AM -0400, s c wrote:
> > I would like to use the au1000_gpio char driver to blink some status
> > lights. Specifically, I would like to control the hex leds on the
> > dbau1500 development board. Preferably via shell script.
>
> http://free-electrons.com/pub/mirror/devmem2.c is your friend.
>
> On a DBAu1100 for instance I have a nice example:
>
>         $ while true; do
>         >       for i in 7 B D E D B; do
>         >                       ./devmem2 0x0E000018 w 0x00000${i}03
>         >                       sleep 0.01
>         >               done
>         > done > /dev/null
>         $
>
> Remember the days of the Night Rider? You will see LED D5, D6, D7
> and D8 flash in a nice manner.
>
> In the same way you must be able to alter the hex leds.
>
> Freddy Spierenburg <freddy@dusktilldawn.nl>  http://freddy.snarl.nl/
Thanks. Works as advertised.

A couples notes to anyone else interested
- devmem2 does not use the au1000_gpio char driver so it could
potentially be used with other processors.
-busybox (if you are using it) doesn't support sub-second sleep like
in the example given by Freddy.