Re: Serial IR receiver problem

[andrew@xxxxxxxxxxxxxxxxxxxx (Andrew Gabriel)]

In article <1180473056.654760.271510@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
	Erk <mrman_man@xxxxxxx> writes:
>> That makes it much worse -- there's no FIFO on the modem signals.
>> If the application monitors DCD by spinning, then it's not likely
>> to work with anything else running on the system.
>> What sort of bit rate is the IR signal?
>
> The speed is normally set to 115200 in Winlirc, but I have tried
> different settings with no luck.

That's the UART's data rate, but this interface isn't using the
data part of the UART so that's irrelevant. I was wondering what
the IR data rate is. If it's picking up the IR clock, which is
commonly ~38kHz, it's going to need to sample at 76kHz, which
is a sample every 13µs. If it's just being fed a presence or
absence of IR clock (i.e. the IR data rate), then it's going to
need to sample something like every 200µs. However, whichever one
it uses, this just isn't going to work on a non-realtime system
which is running other applications -- such use of a serial port
just isn't what they are designed for and a more appropriate
hardware interface would be required. Feeding it into a sound
card might work better but would require significant changes to
the associated software to retrieve the data pattern from the
sound card.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]