Dave,

Thanks for the quick reply, I probably need to get some general embedded design/newbie books before I get banned from the lists :-) As far as checking the status, would I be able to receive HEX data over the GPIO lines? The device I'd like to receive data from has a "Serial Out. TTL-level interface, 2400bps, 8 data bits, no parity, 1 stop bit"

On 10/7/07, Dave Hylands <dhylands@gmail.com> wrote:
Hi Shelby,

> I was wondering if it were possible or if any drivers had been wrote that
> would allow me to use some of the GPIO lines on the breakout-vx as a TTL
> input/output. Thanks

Using lines as ouput can be done several ways:
modprobe proc_gpio
echo "GPIO out set" > /proc/gpio/GPIO99

(replace 99 with the pin number you're tryng to set. Replace set with
clear to make it go low.

For input, you can check the status using:

cat /proc/gpio/GPIO99

I also wrote a driver for monitoring changes on a GPIO line:
<http://docswiki.gumstix.com/GPIO_event>

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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