2009/1/25 Duncan Webb <dun...@freevo.org>

> Pirlouwi wrote:
> > 2009/1/24 Duncan Webb <dun...@freevo.org <mailto:dun...@freevo.org>>
> >
> >     Pirlouwi wrote:
> >     > Hello all,
> >     > long time ago that I read this list, good news... it means that my
> >     > freevo 1.7.3 is so rock solid, that I did'nt need support ;-)
> >     >
> >     > Ok. Here is my problem:
> >     > i would like, when Freevo updates the LCD screen, that the
> backlight
> >     > lights up for a specified number of seconds (let us set it to 10
> >     > seconds), and then switches the backlight down back.
> >     >
> >     > It is very annoying to have this flashy backlight leds always on.
> >     > Here is a link to the cw12832 documentation
> >     > <http://www.cwlinux.com/images/Manual/CW12832/cw12832-manual.pdf>.
> >     >
> >     > If someone could give me some help to modify the Freevo LCD module,
> to
> >     > support that feature, should be great!
> >
> >     You have sort of lost me with the question. If I understand you the
> >     problem is the the backlight has always illuminates when commands are
> >     sent to the LCD.
> >
> >     The problem here is that Freevo does not control LCD displays
> directly
> >     but through the LCDproc daemon. You can try adding -backlight off to
> the
> >     commands that set the heartbeat. If this fails maybe you should ask
> this
> >     question on the LCDproc lists.
> >
> >     Duncan
> >
> >
> > I understand your reply, but I don't know how LCDproc could compute how
> > much time has elapsed during the last LCDproc command.
> > What should be great is that the backlight is ON during 10 seconds after
> > a remotecontrol action for example, and then backlight could go back
> > OFF.  It is more a task for the LCDproc client to handle such timeout
> > for the backlight.
> >
> > In the cw12832 manual, I see:
> >
> >     * Backlight On (254 66 253): This command turns on the LED backlight
> >       of the LCD with maximum brightness. Default is ON.
> >     * Backlight Off (254 70 253): This command turns off the LED
> >       backlight of the LCD. Default is OFF.
> >
> >
> > I don't know if it should be possible to send such command from within
> > Freevo.
> > What is your advice?
>
> From what I understand there are two versions of the LCD board, USB and
> serial. It depends on which board you have, if it is a USB board,
> possibly the better choice as most motherboards have USB headers but
> fewer have serial headers.
>
> I first thing I would do is to write some simple test code to see if
> LCDproc actually supports the backlight for the cwlinux driver. If it
> does then I would modify the lcd.py code to dim the backlight when
> playing something.
>
> If the LCDproc driver does not support the backlight then take the
> vfd.py code, assuming that it is a USB device, and modify it as you like
> the display. Or modify the LCDproc driver to allow the control of the
> backlight.
>
> Duncan
>
>
Thx for advise Ducan!
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