[Qt-embedded-interest] Double Buffer Graphics Driver

[Bryce Salmi]

Qt List,

     I am at a point where I am trying to get the Double Buffer Graphics
Driver working.  I have been able to implement the driver and get it to
at least be recognized by the program trying to be run.  However there
is no display on the LCD from the program.  I know the programs run when
I use the VNC display.  Here is what I did:

Built the plug-in (all four files located either at
QTDIR/examples/qws/dbscreen or on the link above) by invoking qmake
without the -project option since there is already a .pro file, I then
simply ran make resulting in the output file which was named
"libdbscreen.so".  One way to use the plug-in was to create a directory
in the application directory, so in my case I created
analogclock/gfxdrivers and placed libdbscreen.so into it (make sure
permissions are set).  At this point I could simply run the command in
the application root directory:

 

./analogclock -qws -display dbscreen

 

The resulting output was "blit_16(): Image format 0 not supported!"
continuously being printed on the command line (once per second... maybe
from the clock actually trying to update the area that changed?).  There
were no LCD changes but at least the driver was recognized and could be
run.

 

I would like to figure this out and think that the blit could be
manually set?  I simply need to copy over the buffer in memory to the
/dev/fbo which I have accessed before in C.  There is no mmap support on
my board (ARM) so the frame buffer test doesn't work... I was hoping
that this would be a way to work around mmap problem.

 

 

 

Sincerely,

 

Bryce

I

 

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