https://github.com/tsalvo/varvara-fpga

implementation of Varvara / Uxn in FPGA
https://github.com/tsalvo/varvara-fpga

Last synced: 3 months ago
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implementation of Varvara / Uxn in FPGA

• Host: GitHub
• URL: https://github.com/tsalvo/varvara-fpga
• Owner: tsalvo
• License: mit
• Created: 2023-07-03T00:57:23.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2024-04-13T16:04:57.000Z (7 months ago)
• Last Synced: 2024-04-13T16:50:39.749Z (7 months ago)
• Language: C
• Homepage:
• Size: 282 KB
• Stars: 14
• Watchers: 5
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-uxn - FPGA - Nearly Complete. (Emulators)

README

        
# uxn-fpga

Very early work in progress implementation of [Varvara / UXN](https://100r.co/site/uxn.html) by [hundredrabbits](https://100r.co/site/home.html) in FPGA using [PipelineC](https://github.com/JulianKemmerer/PipelineC). Intended for importing into the [openfpga-varvara](https://github.com/tsalvo/openfpga-varvara) core for Analogue Pocket.

### Change test ROM (for GHDL simulation):

Currently several ROMs are available as C arrays within `.h` files in the `roms/` directory:

- `amiga.h` bouncing rotating ball

- `bounce.h` uses screen vectors to move a bouncing ball once per frame

- `controller.h` controller input test ROM

- `cube3d.h` draws a 3D spinning cube (partially working)

- `fill_test.h` draws a series of rectangles using the fill command

- `mandelbrot_fast.h` (draws a mandelbrot set image, one pixel at a time)

- `screen_blending.h` draws a series of sprites using different blending techniques

- `star.h` draws 3 rotating stars, with UXN character sprites in the center

To use a different ROM for GHDL simulation, just change the import statement in `uxn.c` to import the correct ROM, and set `DEBUG` = `1` in `uxn_constants.h`.

### build into VHDL files (for later importing into openfpga-uxn project for Analogue Pocket):

```

pipelinec uxn.c

```

### build for GHDL simulation (requires additional plugins)

```

pipelinec uxn.c --sim --comb --ghdl

```

### run GHDL simulation:

```

ghdl -i --std=08 --work=work [sequence of vhd files appended by top_test.vhd]

ghdl -m --std=08 --work=work top_test

ghdl -r --std=08 --work=work top_test --ieee-asserts=disable --stop-time=1ms

```