There is a driver in the CVS code called hw_dsp.c.
Basically you hookup a IR diode to your sound card
Kudos to whoever though of doing this! Just hooking
up the thing to the sound card enables you to hear
the IR signal. And you can record and view signals
with sound tools like audacity.
It does not have good range(about 1M max), but it
does have some advantages for receive work.
It is not tuned to a particular modulation, so can
pick them all up. A good tool to have in your tool
box. I'm still not sure how reliable it will be for
recieve work - I hope to test it more soon. Maybe
you can too.
I have written some of my own code that hopefully
adds some ideas(improvements?) to the current hw_dsp.c offering.
Please take a look if you can:
Another IR sniffing tool I'm working on is to try
and measure modulation rates. By hooking up a
IR transistor or diode signal directly to the DCD input,
(buffered with a FET transistor) you can get a reading.
I'd like to devise some hardware and software specifically
for this purpose. My current circuit is not easy to get
a good reading with, I need to butt the remote control
right up next to the IR receiver. For software I just
scan the IO as fast as the bus runs in some user-mode
code, then display the results(like mode2).
I am also interested in measuring latencies in more of
the IR receiver modules, try to find out which ones
are best. The Panasonic modules seem to stretch the
pulses from 100us to 200us. I tested one out of some
surplus equipment that gave me no latency(stretching,
is skew the proper term?). Unfortunately,
I can't identify this part. I'm thinking of buying
a few shown on the LIRC web page. I found some
suppliers in the states here, let me know if you have
Well, enough of my ramblings, have a great day!