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Gpio ports


I need 8 input ports on the Axis 82 board to monitor pulses from relays. 
The gpio driver seems to do the sort of thing I want but I am not sure 
where the gpio pins are. Forgive me if I've missed something obvious.

I understand that some of the gpio pins are used for the serial control 
lines etc. Are there any gpio pins that are just for gpio? I don't want 
to give up any of the serial ports.... Could I use the parport pins with 
   a gpio-like driver?

One final question. What is the time between each timer interrupt in the 
gpio driver?

Many thanks

Bob Hibberdine