[Lcdproc] Crystalfontz 633/635 Packet Driver Endianness Issue

[Technical Support]

I don't know if it is related, but I'm experiencing similar problems with
LCDd on an Intel (dual Xeon), with Matrix Orbital 212 display.  The display
backlight goes on and off, and sometimes turns off and stays off.

MD 

-----Original Message-----
From: lcdproc-admin@lists.omnipotent.net
[mailto:lcdproc-admin@lists.omnipotent.net] On Behalf Of Russell Krayer
Sent: Sunday, September 10, 2006 4:58 PM
To: lcdproc@lists.omnipotent.net
Subject: Re: [Lcdproc] Crystalfontz 633/635 Packet Driver Endianness Issue

Here is an update ...

** LCDd on ppc with lcdproc on ppc
The backlight turns on and off randomly
Remnants of different screens remain after switching to new screens

** LCDd on AMD64 with lcdproc on ppc
The backlight "flickers" rapidly
Screens seem to work fine otherwise

** LCDd on ppc with lcdproc on AMD64
Initailly the backlight was off but turned on at one point and remained on
Screens all seem to work fine

** LCDd on AMD64 with lcdproc on AMD64
Everything works fine


Any suggestions?  Testing to this point seem to suggest problems with 
lcdproc on ppc.


Thanks!
Russ


>From: "Russell Krayer" <rkrayer@msn.com>
>To: lcdproc@lists.omnipotent.net
>Subject: Re: [Lcdproc] Crystalfontz 633/635 Packet Driver Endianness Issue
>Date: Sun, 10 Sep 2006 13:39:08 -0400
>
>Hi Peter,
>
>Your fix in the nightly build seems to work - thanks for the quick 
>response!
>
>But now I think I am noticing other problems --- I will post again when I 
>can characterize it better.
>
>Regards,
>Russ
>
>
>>From: Peter Marschall <peter@adpm.de>
>>To: lcdproc@lists.omnipotent.net
>>CC: "Russell Krayer" <rkrayer@msn.com>
>>Subject: Re: [Lcdproc] Crystalfontz 633/635 Packet Driver Endianness Issue
>>Date: Sat, 9 Sep 2006 22:18:55 +0200
>>
>>Hi Russell,
>>
>>On Saturday, 9. September 2006 17:10, Russell Krayer wrote:
>> > I stumbled onto an issue with endianness running LCDproc 0.5.0 on a ppc

>>box
>> > (a big endian machine).  The problem is in CFontz633io.c when working 
>>with
>> > the CRC.  I have a fix that is working for me and should still work 
>>with
>> > little endian machines.  Should I send a patch somewhere?  Note, the 
>>bug is
>> > also in the Crystalfontz example program from Crystalfontz vendor.
>>
>>Thanks for the patch you sent in your other post.
>>
>>I looked at it and the existing code and finally found that the idea of
>>using a union for this conversion was a flawed concept.
>>
>>So I changed the code in CVS to convert manually between the
>>CRC and the 2 bytes comprising it.
>>This should fix the endiannes issue as the code now always expects / sends
>>the LCB before the MSB.
>>
>>As a side note: unfortunately CF uses little-endian word order here.
>>With big-endian, a simple htons() had been sufficient.
>>
>>The changes should be in tonight's nightly tar balls at
>>http://lcdproc.sourceforge.net/nightly/lcdproc-CVS-current.tar.gz
>>
>>Please test if the changes work for you
>>
>>Peter
>>
>>--
>>Peter Marschall
>>peter@adpm.de
>>_______________________________________________
>>LCDproc mailing list
>>LCDproc@lists.omnipotent.net
>>http://lists.omnipotent.net/mailman/listinfo/lcdproc
>
>
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