Make: Online : Atmel AVR ATmega8 video overlay project

Atmel AVR ATmega8 video overlay project

Avroverlay
Gary Dion's AVR based video overlay titler, source and schematics included... Nice work, thanks Goose! Link.

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Posted by: tramm_hudson on June 26, 2007 at 4:21 PM

It wasn't immediately clear to me how he is doing the overlay via the SPI hardware since there is no SPI device on the bus, but I think he is just using it to over-write the video signal as it passes by on each scanline. His "font" is in the ltrs[] array, sliced by lines rather than by characters.

The SPI driver shifts the voltage high or low to create the output. That's pretty cool -- I'd like to build a custom bitmap graphics overlay for another project and may try to use the idea.

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