Cambridge pico Chippy

A VGM player using a Raspberry Pi Pico, a YM2151 (OPM) sound chip and an I2S DAC.

Re-uses the same hardware as the sister project picoX21H

Block Diagram

Status

WIP … just started!!!

Working…

• VGM decode (but only for supported chips)
• YM2151 hardware driver and YMDAC to I2S translator
• Following emulations mixed into the main I2S stream…
• SegaPCM
• SN76489
• OKIM5295

Hardware

Schematic for the above.

See README for more information.

Software

Checkout

This repo uses git sub-modules, so checkout using –recurse to clone all the dependent source…

git clone --recurse-submodules https://github.com/SloeComputers/picoChippy.git

or

git clone --recurse-submodules ssh://git@github.com/SloeComputers/picoChippy.git

Software dependencies

• https://github.com/SloeComputers/Platform
• arm-none-eabi-gcc
• cmake via UNIX make or auto detection of ninja if installed
• Python3
• SDL2 (only for native test target)

Build

Being developed on MacOS but should build on Linux too.

Indirect build for supported target rpipico2 with cmake and make (or ninja)…

make

Build a single hardware target e.g. rpipico2 using cmake…

mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release -DPLT_TARGET=rp2350 -DCMAKE_TOOLCHAIN_FILE=Platform/MTL/rp2350/target/toolchain.cmake ..
make

flashable images will be found under the build sub-directory here…

build/rpipico2/picoChippy_RPIPICO_I2S_DAC.uf2

License

This project is licensed under the MIT License - see the LICENSE file for details

Acknowledgements

The VGM rippers