From: Andreas Grosche <ten@ru...> - 2009-04-13 21:59:17
Christoph Bartelmus wrote 2009-04-12 21:50:
> any interrupt that comes in during transmission will destroy the timing completely
> and you will end up sending something you did not intend to send.
> It's not just waiting for the pulse or space time, as we have to generate the carrier as well.
> If the simple serial port transmitter design is giving you problems
> there is only one solution: don't use it.
If there is another one you propose, it is neither in
http://www.lirc.org/transmitters.html (unless you count the special
version http://iguanaworks.net/product2.psp shown in the bottom
photograph and advertised "for controlling some devices from Windows"
only) nor does there seem to be an abundance of documented working
configuration files online. There is no shortage of NE555s etc. (as
may be depicted in the link above) if one knows what LIRC can be made
aware of, and how - so it is worth building in the first place.
Requests for serial/USB hardware carrier solutions seem to have come
to nothing e.g. in
(including another very interesting solution also documented by
http://gathering.tweakers.net/forum/list_messages/1077675/0 - i.e. the
merging of IR and RF transceivers) and countless threads in
http://vdr-portal.de/board/board.php?boardid=13 or similar HTPC
What is known to work with LIRC as a transceiver without causing
excessive system load (preferably using a variable,
software-controlled hardware/firmware carrier oscillator)?
From: Jarod Wilson <jarod@wi...> - 2009-04-13 22:13:32
On Apr 13, 2009, at 5:59 PM, Andreas Grosche wrote:
> Christoph Bartelmus wrote 2009-04-12 21:50:
>> any interrupt that comes in during transmission will destroy the
>> timing completely
>> and you will end up sending something you did not intend to send.
>> It's not just waiting for the pulse or space time, as we have to
>> generate the carrier as well.
>> If the simple serial port transmitter design is giving you problems
>> there is only one solution: don't use it.
> If there is another one you propose, it is neither in
Hrm. MCE USB devices really ought to be listed there. They work quite
nicely w/the lirc_mceusb2 driver (or so I understand -- I talk to my
own cable box via FireWire). The commandir devices also work pretty
well, albeit with a smaller subset of IR signals compared to the
mceusb2 devices (and a higher price tag, but they do many other things