HELP! Need info on how to use a IrDA infrared port as TV remote!
Angelman of Actual Reality
the infrared COM port on my notebook computer to record and playback
tv remote signals?
PBerry1234
transmits the same type of serial data that a hard wired serial port does.
This is not the same as TV remote pusles, so you'll probably have to look into
assembly language routines to directly manipulate the port. One thing you
might want to consider is that the range on IrDA ports is not very far.
Paul
in...@embednet.com
communication protocol standards that don't include TV remote control,
therefore there is no way a PC and any device that uses IrDA would
beable to decifer such information.
Good luck.
EMBEDnet: Developers of IrDA protocol software.
http://www.embednet.com
Rudolf Ladyzhenskii
>
>>Is there any software , source code and technical info on how to use
>>the infrared COM port on my notebook computer to record and playback
>>tv remote signals?
>
No
Why? Because IR port on your notebook works for IrDA only. TV remote is a
different standard altogether. IrDA is a digital communication standard and
TV remote use different modulation/coding scheme.
You will need some additional hardware connected to your parallel/serial
port that will record TV remote signal, code it and send to PC. One of
Circuit Cellar Inc. magazines had an article on such a system based on 8051
micro.
Rudolf
Amish...@aol.com
There is probably a way to do this, but the port would have to be manipulated
directly, like pberr...@aol.com wrote. There is probably a remote control
emulator out there that will send the correct codes to operate the TV. I don;t
think that the Infrared light emitted from the IrDa port is the wrong "color"
for use with TV or some other glaring incompatibility. People said "No" to
digitized voice through the PC speaker in 1988, but by 1993 there was the
Windows SPEAKER.DRV that allowed you to play .wav files and, yes, synthesized
speech out of the PC speaker. It is amazing what people can do when they are
bored. It will only be a matter of time before someone writes a remote control
program for the Infared Port.
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Rudolf Ladyzhenskii
The reason is that IrDA port uses a UART to drive it or special IrDA
controller (that is a UART anyway at SIR speeds).
TV remote uses different modulation scheme.
Rudolf
Amish...@aol.com wrote in message <7fe2i0$5pc$1...@nnrp1.dejanews.com>...
Tim Simpson
>
>The reason is that IrDA port uses a UART to drive it or special IrDA
>controller (that is a UART anyway at SIR speeds).
>TV remote uses different modulation scheme.
>
>Rudolf
Ok but what if your motherboard produces both IrDA and ASKIR
signals, configurable via the CMOS?
I'm running a TMC TI6NB motherboard with a homemade transciever,
based on the HP HSDL-1100-018. And this appears to work fine for
IrDA, but I have no information on using it for ASKIR (the m/b that
is). So is this a valid setting to do anything?
Rudolf Ladyzhenskii
>
>Ok but what if your motherboard produces both IrDA and ASKIR
>signals, configurable via the CMOS?
>I'm running a TMC TI6NB motherboard with a homemade transciever,
>based on the HP HSDL-1100-018. And this appears to work fine for
>IrDA, but I have no information on using it for ASKIR (the m/b that
>is). So is this a valid setting to do anything?
>
>
I am not sure what ASKIR mode is. There are 3 modes IrDA can work in SIR,
MIR and FIR. Usually you can only select SIR or FIR. SIR is speeds up to
155.2kbps and in this mode Ir controller IC behaves like half-duplex UART.
FIR is up to 4Mbps. In this case Ir controller has some hardware support for
data framing and it uses different modulation technique (PPM -- puls
position modulation). In any case this is not what your are after.
I guess you have to find a manual for your m/b and see what ASKIR mode is.
Keep us posted if you find what this is.
Rudolf
Adam Davis
that the IrDA could be put in to allow direct or semi-diret control of
the ir LED.
-Adam
Rudolf Ladyzhenskii wrote:
>
> You can not. Full stop.
>
> The reason is that IrDA port uses a UART to drive it or special IrDA
> controller (that is a UART anyway at SIR speeds).
> TV remote uses different modulation scheme.
>
> Rudolf
>
Allan Tonkin
>MIR and FIR. Usually you can only select SIR or FIR. SIR is speeds up to
>155.2kbps and in this mode Ir controller IC behaves like half-duplex UART.
>FIR is up to 4Mbps. In this case Ir controller has some hardware support
for
>data framing and it uses different modulation technique (PPM -- puls
>position modulation). In any case this is not what your are after.
I already have the motherboard manual, it is less help than you possibly
imagine in this respect. ASKIR == Asynchronous Shift Keying InfraRed
It is what the remote control use to transmit data (This is my understanding
anyway.) They use a 56 kHz carrier, and modulate the binary data onto this.
Somebody may correct me if I'm wrong, but this is according to what I was
reading.
Rudolf Ladyzhenskii
"amplitude", not for "asynchronous". This is according to my book.
The way to use it for TV remote then will be either:
1. Find a software that will do it (or at least a driver).
2. Find out what chip they useon the main board, get its data sheet and
program it yourself.
Rudolf
Allan Tonkin wrote in message <92455917...@Chaos.es.co.nz>...
Randy Barrow
<SNIP>
> anyway.) They use a 56 kHz carrier, and modulate the binary data onto this.
> Somebody may correct me if I'm wrong, but this is according to what I was
> reading.
Well, if it's at 56KHz then that's beyond what most TV remotes use. Most
consumer electronics use 35-40KHz unless things have changed drastically
in the last few years...my 2 cents worth on the topic.
Later,
Randy Barrow
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