On Fri, 13 Apr 2007 00:34:30 +0200, Philippe Teuwen <[EMAIL PROTECTED]>
wrote:
Or as I have plans to change that to be a kind of universal
receiver/emitter, the thing to do is sample the received code at a
higher frequency and send the raw data to the computer. That should
give us an idea of the signal your tux receives.
I remember of a quite efficient way a program on my HP48 worked to act
as universal remote:
It encodes the stream as a succession of counter values, each of them
being the duration of a receiving/non-receiving state. If a duration
exceeds 256 then special value is used to code duration on more than one
byte (thinks of UTF-8 coding style).
The result still takes some bytes, could take quite a lot of time to
transmit with the small packets of the radio :-/
I once found an application note of cypress that did just that, that's
pretty neat imo. I'll try to find the link again.
We could also have a look at the way lirc encodes learned codes and use
directly that coding on the tux.
That's what I'd like to know before changing the IR emiter/receiver
functions. We certainly want to benefit from lirc and there are already
some simple homemade IR receivers for lirc. It's maybe better to do
something compatible with that instead of having a custom coding and
writing a specific lirc driver.
BTW what is the IR receiver hardware? Does it demodulates already the
36kHz and outputs in TTL?
In other words, do we have to sample the modulation or just the
bits/Manchester-bits?
It uses a common IR receiver module which demodulates the 37.9kHz and
outputs the logical signal bits directly. Actually it's the 940nm IR light
wave which is modulated at 37.9kHz and pulsed with the logical signal for
the coding and protocol which is RC5 here (manchester coding.)
david
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