https://github.com/plusk01/img2vhdl

Takes an image and creates a VHDL file that will display that image using 8-bit VGA
https://github.com/plusk01/img2vhdl

Last synced: over 1 year ago
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Takes an image and creates a VHDL file that will display that image using 8-bit VGA

• Host: GitHub
• URL: https://github.com/plusk01/img2vhdl
• Owner: plusk01
• Created: 2015-02-15T20:59:23.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2015-02-16T17:56:50.000Z (over 11 years ago)
• Last Synced: 2025-01-21T14:14:09.302Z (over 1 year ago)
• Language: CSS
• Homepage: http://pclusk.com/img2vhdl
• Size: 879 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# img2vhdl

[This JavaScript web app](http://pclusk.com/img2vhdl) utilized HTML5 File and Image APIs with the canvas element to process images and create VHDL-83 synthesizable code.

The app takes an image, and stretches it to fit inside a 640x480 window. Then, you can press the `8-bit Colorize!` button and the JavaScript algorithm will loop through each pixel and turn it into 8-bit RGB using the following color maps:

    colorMapR and colorMapG

    {  

        0   : "000",

        37  : "001",

        74  : "010",

        111 : "011",

        148 : "100",

        185 : "101",

        222 : "110",

        255 : "111"

    }

    colorMapB

    {

        0: "00",

        85: "01",

        170: "10",

        255: "11"

    }

Once 8-bit colorized, press `Get VHDL` to download the generated VHDL file that implements your image in code. This is done in a module that uses a process and a case statement to choose which values of RGB to display given a concatenated xy coordinate.

All you have to do to use this code is implement it in your top-level design as follows:

    img: entity work.img2vhdl

        port map(

            pixel_x=>pixel_x, pixel_y=>pixel_y,

            red=>myRed,green=>myGreen,blue=>myBlue

        );

This code was tested to run on a Digilent Nexys2 with Spartan-3E FPGA. To understand more fully how 640x480 8-bit VGA works on this dev board, consult the reference manual below.

----------------------------------

### Resources ###

- [Demo Website](http://pclusk.com/img2vhdl)

- [Digilent Nexys2 (Spartan3E) Reference Manual](http://www.digilentinc.com/data/products/nexys2/nexys2_rm.pdf)