Re: [Gumstix-users] Monitoring a GPIO

[Dan T. <log...@gm...>]

Hi James,

You need to look at Dave's fantastic example button driver on the
wikki.  It wouldn't take a huge amount of work to get that to a point
where you could use it.

a) Install driver
b) Wire up your pulse input with some kind of voltage dropping circuit
(someone else will help you with that)
c) do something like this...

#insmod sample.ko
#./sample-test > myfile.txt

Without any extra work that'd store the jiffy count at the time of
each pulse in the text file.  Some minor code changes and it'd store
the date/time.

I can't see it being impossible to adapt the driver further to output
the frequency of pulses, rather than events for the pulses themselves.

I hope that made sense.  Have a look at the example code and it should
mean more to you.  I was a complete driver newbie a couple of weeks
ago and now I'm an addict.  Mostly due to Dave's work on that example!

All the very best and good luck for the flight!

Dan

On 20 Feb 2006 15:03:29 +0000, James Coxon <ja...@ca...> wrote:
> Hey Everyone, As the launch for Pegasus II
> (http://www.srcf.ucam.org/~jac208/pegasus/) draws closer (4th March i hop=
e)
> I have been offered a mounted GM-tube to measure radiation. It gives a 5V
> pulse everytime a "count" is detected. Is it possible for me to monitor
> this through a GPIO on my waysmall? How would i go about achieving this (=
I
> only have 11 days though!) Thanks in advance James
>
>
>
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--
Dan Taylor BSc MIEE

Software Development Engineer, JTL Systems Ltd
PhD Student, Heriot Watt University, UK

http://www.logicalgenetics.com