Re: [Gumstix-users] using gpio's to read a quadrature signal

[Joseph R L. <lif...@gm...>]

I have spent the last several weeks getting this to work, but using C++ is
was very round about for my visual GUI. The easiest way is to use the
gpio-event driver on the gumstix wiki and listen for events. Then run an if
statement in that infinite while loop to kick off your decoder function
every time you sense an event. This way you can constantly monitor for
quadrature signals (pins 68-75 on the Breakout GS, the row starting with the
LDD0 label) and have another to do what ever action you want when a signal
is detected, such as decode the Gray code. Hope this helps.

Sincerely,

Joe

On 4/1/07, Ian Smith <it...@cs...> wrote:
>
> it seems possible to read a quadrature signal using the gpio lines, has
> anyone done this?  how difficult would it be?  any advice would be
> great, im looking to read 3 rotary encoders, unless anyone knows of a
> chip that can read quadrature and output an I2C signal.  also i know its
> been asked many times before, but where do i need to look to figure out
> which gpio lines i can use with out tampering with any other functions i
> am using?  thanks for any help
> -Ian
>
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-- 
Sincerely,


Joseph

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Joseph R Lust
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