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Gary Dion’s AVR based video overlay titler, source and schematics included… Nice work, thanks Goose! Link.
2 thoughts on “Atmel AVR ATmega8 video overlay project”
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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.