[mythtv-users] lirc output reliability

[jgmtfia Mr]

http://www.mytvstore.com/product_id_004.html

They have USB as serial versions.

On 10/20/05, Robert Denier <denier at umr.edu> wrote:
>
> I thought I saw a device that connected via a serial port that would
> send remote codes awhile back, but I can't remember its name. Basically
> you would send a "2" or whatever via serial, and not the complex
> modulation pattern. The devices hardware would handle the rest.
>
> Now, I've no idea if such a thing would work with multiple dish 301
> receivers or not, but perhaps someone can at least think of the name of
> it.
>
> -Robert
>
> On Thu, 2005-10-20 at 11:33 -0400, Dan Wilga wrote:
> > At 10:08 AM -0500 10/19/05, Robert Denier wrote:
> > >For some reason my lirc output has been very unreliable lately. I keep
> > >getting wrong channels, particularly sense I went to dish 301 receivers
> > >from the newer model version.
> >
> > I have the same problem. I believe it has to do with the fact that
> > lirc relies on the RTC timer. If something happens to interrupt it
> > while it's pausing, the frequency of the output will be off and the
> > receiver will balk. I think what makes the 301 more sensitive to this
> > than other IR devices is the fact that it operates at a higher
> > frequency (56000 Hz) than most.
> >
> > I'm using an opto-coupler to interface my serial port to the Dish 301
> > receivers, so I know it's not an LED-related problem. I have tried
> > niceing the lirc process so it won't be as likely to get interrupted,
> > but that doesn't seem to help.
> >
> > My next step is to build a device that will send the IR pulses
> > independently of the PC, but I don't know how long that will take.
> > For now I just put up with the occasional missed program.
> >
> > By the way, I analyzed the signal received by the Dish receiver with
> > an oscilloscope and compared it to what was being generated by my
> > device. After tweaking, I came to this lirc config, modified from the
> > stock "3100" remote:
> >
> > begin remote
> >
> > name 3100
> > bits 16
> > flags SPACE_ENC
> > eps 30
> > aeps 100
> > header 550 5830
> > one 550 1550
> > zero 550 2570
> > ptrail 550
> > gap 5530
> > min_repeat 8
> > toggle_bit 0
> > frequency 56000
> >
>
>
>
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>
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