Comment by ionut on March 15, 2010 at 6:07am

wow this is quite nice

Comment by Francesco Ferrara on March 15, 2010 at 6:20am

8Mhz pixel clock, over 400pixel in X, 300 in Y

Comment by fibrewire on March 15, 2010 at 6:22am

How would i do this with NTSC video? Is it possible to cover the entire screen with the video overlay? I would really like to explore this further!

Comment by Francesco Ferrara on March 15, 2010 at 6:31am

If doesn't work with NTSC it is simple to adapt it, change le lenght of the VSYNC in the source code.
With 8Mhz pixel clock ATmega 328p is not fast enough, in fact, I must prepare in the 8 lines before the data for the 8 lines displayed.
But with 4Mhz it is possible, with large characters. Try it.

Comment by mook on March 15, 2010 at 12:14pm

@Robert
here's the same thing but for NTSC:
http://www.viennawireless.org/balloon/hardware/overlay/index.php
another no sync chip AVR OSD from the 2004 design contest:
http://www.circuitcellar.com/avr2004/DA3754.html

Comment by fibrewire on March 15, 2010 at 12:45pm

Fantastic! That's exactly what i'm looking for - Thanks!

Comment by Francesco Ferrara on March 16, 2010 at 12:48am

There is one BIG difference.
I have used the USART on ATmega to reach a 8mhz pixel clock, with a superb stability of the text, thanks to it perfect timing.
Check it on NTSC signal! :)

Comment by Rana on March 16, 2010 at 1:43am

Nice work ! where is the code ?
Pl. provide link to that so that we can also test.

Comment by Francesco Ferrara on March 16, 2010 at 1:53am

Follow the URL, that is in the article.

Comment by Rana on March 16, 2010 at 3:28am

This one http://www.elenafrancesco.org/arduino/palgenerator/tvpal3.pde
or
This one http://www.elenafrancesco.org/arduino/baroneosd/BaroneOSD5.pde
???

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