https://github.com/WonderfulToolchain/ws-extfriend

WonderSwan EXT port <-> USB adapter for homebrew development.
https://github.com/WonderfulToolchain/ws-extfriend

raspberry-pi-pico wonderswan

Last synced: about 2 months ago
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WonderSwan EXT port <-> USB adapter for homebrew development.

• Host: GitHub
• URL: https://github.com/WonderfulToolchain/ws-extfriend
• Owner: WonderfulToolchain
• License: gpl-3.0
• Created: 2022-11-26T12:53:56.000Z (about 2 years ago)
• Default Branch: main
• Last Pushed: 2024-03-29T14:10:46.000Z (9 months ago)
• Last Synced: 2024-08-03T17:12:44.792Z (5 months ago)
• Topics: raspberry-pi-pico, wonderswan
• Language: C
• Homepage:
• Size: 34.2 KB
• Stars: 20
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: COPYING

Awesome Lists containing this project

• awesome-wsdev - ExtFriend - 3.0) - WonderSwan EXT<->USB adapter with digital audio capture. (Hardware development / Other hardware development)

README

        
# ExtFriend

ExtFriend is a USB adapter for the WonderSwan's EXT port based on the RP2040 chip and the Raspberry Pi Pico board, providing the following features at a low cost:

* A USB serial port communicating with the WonderSwan at 9600 and 38400 baud,

* A USB audio device allowing digital stereo audio capture from the WonderSwan.

Both features can be active simultaneously - for example, this could allow one to control a WonderSwan as an audio synthesizer.

Special thanks to [BluRaf](https://mastodon.sdf.org/@BluRaf) for providing support and advice through my first journey into TinyUSB lands.

## Tips

* If you mute the USB audio device, the WonderSwan will consider the headphones as disconnected, re-enabling the internal speaker.

## Build Instructions

* Copy `pico_sdk_import.cmake` from your Pico-SDK installation to the repository's root.

* Run `mkdir build`, `cd build`, `cmake ..`, `make`.

## Installation Instructions (Raspberry Pi Pico)

![ExtFriend plugged into a SwanCrystal using a soldered header.](https://img.asie.pl/PTC3.jpg)

* Flash the program to the Pico: for example, `picotool load -v -x extfriend.uf2`

* Connect the Raspberry Pi Pico to [the WonderSwan's EXT port](http://daifukkat.su/docs/wsman/#pinout_extport). The default build of ExtFriend uses seven consecutive Pi Pico pins, as follows:

  * EXT GND - Pico GND (for example pin 3)

  * EXT SER_MOSI - Pico pin 2 (GP1)

  * EXT SER_MISO - Pico pin 1 (GP0)

  * If you want to use digital audio capture:

    * EXT HDPN_BCLK - Pico pin 7 (GP5)

    * EXT HDPN_LRCK - Pico pin 6 (GP4)

    * EXT HDPN_SDAT - Pico pin 5 (GP3)

    * EXT /HDPN_DETECT - Pico pin 4 (GP2)

If you don't have an EXT port plug or cable handy, you can use an HDMI breakout board. An example instruction guide is provided [here](https://twitter.com/peca_port0/status/1631569109912817667) (in Japanese), for a $2 AliExpress board.

## License

GPLv3+.