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Re: Gpio ports
There are three gpio ports, Port A, Port B, and Port G. A and B are multiplexed
with the parrallel and serial ports, and port G allows you to access any unused
digital I/O pin on the board. You should be able to use the parport pins with
the gpio driver.
Look at ETRAX100LX Design Reference
(http://developer.axis.com/doc/hardware/etrax100lx/des_ref.html) for the
details. Chapter 17 describes use of the port and Chapter 20.10 describes how
the pins are multiplexed on the chip to the different I/O interfaces. The MCM
chip on the Axis82 has almost the same pin out as the 100LX. Then look at the
schematic for the Axis82 board
determine which pins you need and which you can use for gpio.
Robert Hibberdine wrote:
> 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
- Gpio ports
- From: Robert Hibberdine <email@example.com>