https://github.com/mattvenn/xor_vga_fpga

playing with XOR video patterns on an FPGA
https://github.com/mattvenn/xor_vga_fpga

Last synced: about 2 months ago
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playing with XOR video patterns on an FPGA

• Host: GitHub
• URL: https://github.com/mattvenn/xor_vga_fpga
• Owner: mattvenn
• Created: 2021-04-19T14:44:29.000Z (about 4 years ago)
• Default Branch: main
• Last Pushed: 2021-04-19T14:46:06.000Z (about 4 years ago)
• Last Synced: 2025-04-01T18:09:57.948Z (about 2 months ago)
• Language: Verilog
• Size: 2.54 MB
• Stars: 13
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE-2.0.txt

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README

        
# XOR video fun on an FPGA

Saw this: https://hackaday.com/2021/04/13/alien-art-drawn-with-surprisingly-simple-math/

The magic line is:

    assign rrggbb = ((x_px ^ y_px) % 10'd9) == 1 ? 6'b111111 : 6'b000000;

And made an [FPGA implementation](rtl/xor.v).

![xor demo](docs/xor.jpg)

## Simulation instructions

Ensure that you have libsdl2-dev and verilator installed.

    sudo apt-get install libsdl2-dev libsdl2-image-dev verilator

To run the simulation use the following commands:

    cd rtl

    make verilator && ./obj_dir/Vxor

![fb_verilator](docs/fb_verilator.png)

## FPGA Build instructions

It's setup to run on [1 Bit Squared icebreaker](https://1bitsquared.com/products/icebreaker) with my [VGA pmod](https://github.com/mattvenn/6bit-pmod-vga) plugged into pmod1a.

type

    make prog

to build & upload to the icebreaker

## License

This software and hardware is licensed under the [Apache License version 2](LICENSE-2.0.txt)