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Atmel AVR ATmega8 video overlay project

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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

  1. 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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