[Lcdproc] Crystalfontz 633/635 Packet Driver Endianness Issue

[Russell Krayer]

Hmm... I can't reproduce the problems anymore ... interesting.

I'll keep an eye on it ... otherwise I am happy.

Regards,
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 16:58:08 -0400
>
>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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