Thank you very much Phil Quiney, i have included these routines into
initialization part of our software and there is no more noise. Thank
you Jon Povey for very usefull explanation too. It was so nice to get
the solution very qucikly with undestanding the reason of this problem.
Best Regards
Serkan Erdogan
Phil Quiney wrote:
Hi,
Yes it does that ;-)
Use the attached program to fix it....
Put a 'writeb 20000020 0 10' into the system start up & the flicker will stop.
Regards
Phil Q
Phil Quiney, Senior Software Engineer
Trinity Convergence
Cambridge Business Park
Cowley Road
Cambridge CB4 0WZ, UK
T: +44(0)1223-435536
F: +44(0)1223-435560
www.trinityconvergence.com
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of serkan erdogan
Sent: 30 June 2008 08:14
To: [email protected]
Subject: Noise on DM355 LCD interface!
Hii All,
i am a member of dm355 software developer team in my company. we have a problem with the noise appearing when we starting a software on dm355.
we are using paralel lcd interface (but the problem is same for SVIDEO and COMPOSITE outputs with analog lcds) and when our software doing a lot of memory copy and move the screen is getting very noisy. I have tested this by different king of software and gui and math libraries.
All time during the first startup of software and the memory activity is getting higher the noise is reaching the top level. All time when ddr ram activity is high (linux memory copy and move actions) the noise coming high. Otherwise noise is still standing on the screen but sometimes it becomes intolerable.
How can we solve this problem ??? Is there anybody have this problem too?? The
noise is appearing as some block of pixels beginning to zigzag horizontally and
some thin group of pixel lines are sliding on screen horizontally again. After
the succesfull starting of the software the noise is getting very very lower.
But when another high memory activity happens the noise is getting higher again.
My kernel is default montavista linux kernel 4.0 i have done the software
updates but the problem is still exists.
Thank you very much for help ad reading. I need all advices and ideas to
consider on.
Serkan Erdogan
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