Dear Phil,
First of all, the reason I did get nothing with was that the colorbar masked
the image below.
After having disabled the colorbar the linux pinguin appeared on the top-left
corner of the blue screen.
Then, I sent again the command
/# cp image /dev/fb/0
and something very confusing was displayed, like an incomplete version of the
true image, compressed in the upper half of the panel.
Then, following your suggestion I get
/# fbset -fb /dev/fb/0
mode "720x480-29"
# D: 5.556 MHz, H: 7.234 kHz, V: 29.406 Hz
geometry 720 480 720 960 16
timings 180000 40 4 8 2 4 2
laced true
rgba 5/11,6/5,5/0,0/0
endmode
Instead, what I really need is something like this
D: 6.75 MHz
H: 16.544 kHz
V: 63.145 Hz
geometry: 320 240
bits per pixel: 16
progressive
rgb656
So, I tryed to configure the video format in this way:
/# fbset -fb /dev/fb/0 -xres 320 -vxres 320
/# fbset -fb /dev/fb/0 -yres 240 -vyres 240
/# fbset -fb /dev/fb/0 -depth 16
/# fbset -fb /dev/fb/0 -pixclock 148148
/# fbset -fb /dev/fb/0 -left 68
/# fbset -fb /dev/fb/0 -right 20
/# fbset -fb /dev/fb/0 -upper 18
/# fbset -fb /dev/fb/0 -lower 4
/# fbset -fb /dev/fb/0 -hslen 0
/# fbset -fb /dev/fb/0 -vslen 0
/# fbset -fb /dev/fb/0 -laced false
And write out the image
/# cp image /dev/fb/0
After that I get info again:
/# fbset -fb /dev/fb/0 -i
mode "320x240-63"
# D: 6.750 MHz, H: 16.544 kHz, V: 63.146 Hz
geometry 320 240 320 240 16
timings 148148 68 20 18 4 0 0
nonstd 1
rgba 5/11,6/5,5/0,0/0
endmode
Frame buffer device information:
Name : dm_osd0_fb
Address : 0x87600000
Size : 1658880
Type : PACKED PIXELS
Visual : TRUECOLOR
XPanStep : 0
YPanStep : 1
YWrapStep : 0
LineLength : 640
MMIO Address: 0xfec72600
MMIO Size : 384
Accelerator : No
Now the image is more readable, but still compressed in the top half of the
screen, and with innatural colours (yellow instead of blue)
Any idea?
Regards
Gabriele
Da: Phil Quiney [mailto:[EMAIL PROTECTED]
Inviato: giovedì 23 ottobre 2008 14.00
A: Gabriele Filosofi; [email protected]
Oggetto: RE: dm644x - fbdev in kernel 2.6.25-davinci1
Hi Gabriele,
Can you check with 'fbset' what size the frame buffer is set to..
Something like 'fbset -fb /dev/fb/0'
If it is not 320x480 then you may find it will work if you use fbset to set the
x & y resolution to match your LCD - I can't remember what the parameters are,
possibly -xres/-yres (and also there is a -vxres/-vyres for a virtual size). I
would set both xres and vxres to 320 and yres and vyres to 240 to start with.
You should be able to cat any old file to /dev/fb/0 and something appear on the
display, /bin/busybox is what I use - it is quite colourful ;-)
Regards
Phil Q
Phil Quiney, Principal 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<http://www.trinityconvergence.com/>
________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gabriele Filosofi
Sent: 23 October 2008 11:02
To: [email protected]
Subject: dm644x - fbdev in kernel 2.6.25-davinci1
Hi,
By modifying some VPBE registers I was able to display the colorbar on my QVGA
LCD, so the hardware setup is ok.
Now I have an RGB656 image that is 320x240. What would be the best way to get
it statically onto the screen?
By copying (cp image /dev/fb/0) or cutting (cat image > /dev/fb/0) I get
nothing coming out of the display.
Is it not the fb stuff ready to be used in git kernel 2.6.25-davinci1? Is there
anything I need to do?
Should I write a program that opens up the OSD0 and then set the OSD dimensions
to 320x240 and then write the image file directly to /dev/fb/0?
kindly help me to come out from this problem.
Thanks and regards,
Gabriele
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