tsalvo / varvara-fpga

implementation of Varvara / Uxn in FPGA

uxn-fpga

Very early work in progress implementation of Varvara / UXN by hundredrabbits in FPGA using PipelineC. Intended for importing into the 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