Re: [Gumstix-users] reading From serial port (ttyS2) and setting a GPIO

[Dave H. <dhy...@gm...>]

Hi,

On Thu, Jan 12, 2012 at 12:56 AM, sac <sch...@ya...> wrote:
>
> Hi all,
>
> Background
> I m working on a gumstix-connex 400xm alongwith a tweener. I've connected the
> connex to my laptop on via ethernet port and having access via ssh.
> Now, through its serial port (ttyS2), the gumstix is communicating to a device
> successfully. the device is to send an "M" signal on the serial port at some
> occurence.
> Problem
> I want connex to constantly look for that signal on serial port and consequently
> set a GPIO, which i shall use to blink any LED.
> Please help!

The serial port is pretty much the same as for all linux serial ports.
You can read about serial port programming
http://tldp.org/HOWTO/Serial-Programming-HOWTO/

I wrote a sample program which you can find here:
http://svn.hylands.org/host/sertest/

It read from the serial port and writes to stdout, and whatever it
reads from stdin it send out the serial port, in effect acting like a
super-simple terminal emulator.

You can readup about GPIOs over here:
http://wiki.gumstix.org/index.php?title=GPIO

-- 
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com