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[Lcdproc] Crystalfontz 635 usb lcd noise

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  • From: fnacino AT (Frederick Nacino)
  • Subject: [Lcdproc] Crystalfontz 635 usb lcd noise
  • Date: Sat Mar 25 01:03:01 2006

I was thinking maybe it isn't serial noise but it's seems almost as if
the data being transmitted from the LCDd to the display is happening
too fast and certain things just don't get recognized by the display.
I'd like to lower the baud rate but I was told this wouldn't work for
USB devices. I did realize that the USB=yes option wasn't set so I set
it and it seems my problem got a little worse in that I will sometimes
get a bunch of hearts now along with my original problem when I use
BigClock. I'm running linux 2.4.26 btw and yes 635 is 20x4.


Andrew Foss wrote:

> hmmm, it's highly unlikely to be serial noise, that's the good news.
> Have you tried creating a test widget and sending text to a specific
> location, like row 1 column 1 and row2 column 16 or such and
> confirming that the driver's putting your text in the right location?
> Also, for diagnosis I might suggest seeing if you set the screen to
> 16x2 do you get at least 2 rows of 16 that behave normally, the 635 is
> 20x4 isn't it?
> andrew
> Frederick Nacino wrote:
>> I've scoured the archives for some help with no luck. I have a
>> Crystalfontz 635 USB and it's running on linux. Running lcdproc the
>> display generally works however although I am not getting garbage, I
>> seem to be getting residual data from previous screens littering my
>> current screen. Trying to clear bad data out by sending blank lines
>> to the display does not work. Other problems include menu widgets
>> not appearing in the correct position or data not appearing when it
>> should. Things that generally have to do with graphics and screen
>> cursor positioning seem to fair worse than trying to display normal
>> text, for example displaying the BigClock lcdproc client seems to be
>> my worst offender as it is halfway unreadable and always leaves
>> residue that cannot be cleaned up by subsequent screens.. I'm running
>> current lcdproc code as of 3/14/2006. Screen size settings look good
>> as well as does my conf. I am not sure what to make of what I am
>> seeing or how to correct it. Any help would be great.
>> Thanks!
>> Fred
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Frederick Nacino
Software Engineer, FCP Engineering
Internap Network Services
(408) 501-3971

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