All,
The screen with noise issue is caused by bandwidth configuration
problems with the DDR memory, there is an application note from TI
(DM350_HD_Display.pdf) from June 2007 that explains in detail how to
setup this value for the optimal based on your system requirements. I
don't have a pointer for it on TI website, but you could ask for it to
your FAE.
Diego Dompe
RidgeRun Engineering
On Jun 30, 2008, at 6:57 AM, serkan erdogan wrote:
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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