https://github.com/xtreme8000/picoave

Wii HDMI mod using a rp2040 mcu
https://github.com/xtreme8000/picoave

ave gamecube hdmi mod modding pico raspberry-pi-pico rp2040 wii

Last synced: about 2 months ago
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Wii HDMI mod using a rp2040 mcu

• Host: GitHub
• URL: https://github.com/xtreme8000/picoave
• Owner: xtreme8000
• License: gpl-3.0
• Created: 2024-05-22T22:49:56.000Z (7 months ago)
• Default Branch: master
• Last Pushed: 2024-09-16T10:00:01.000Z (3 months ago)
• Last Synced: 2024-09-16T15:14:57.212Z (3 months ago)
• Topics: ave, gamecube, hdmi, mod, modding, pico, raspberry-pi-pico, rp2040, wii
• Language: C
• Homepage:
• Size: 1.62 MB
• Stars: 4
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# picoAVE

A hardware/software HDMI mod designed for the Nintendo Wii based on the rp2040 microcontroller found on a Raspberry Pi Pico. Due to the readily available parts, this mod should be a lot cheaper to build compared to FPGA based solutions. It cost me less than 50€ to have two made, so only 25€ a piece. Sadly custom PCBs are necessary, as a stock pico board does not bring out the required clock input pin and is also too large to install inplace.

The CPU runs a parallel video processing pipeline across both cores to achieve full 720x480p 60Hz throughput without any color/information loss or other compromises. There is vsync by design, so tearing is impossible. A separate background task sends out audio packets in spare time.

> **[Look here](docs/impl_details.md) for in-depth implementation details.**

> [!NOTE]

> In theory this mod should also work on a Gamecube, however I have not tested it.

> [!WARNING]

> Currently the only supported mode is "EDTV / HDTV (480p)" as found in Wii settings.

> Any other mode results in no signal output!

## Building (software)

This is the same as any other pico project. You should probably edit the pico sdk path, too. It is absolutely crucial to build in release mode. Firmware flashing is covered [here](docs/building_hardware.md#flashing-firmware).

```bash

mkdir build

cd build

cmake -DCMAKE_BUILD_TYPE=Release -DPICO_SDK_PATH=/opt/pico-sdk/ ..

make

```

## Building (hardware)

> **[Look here](docs/building_hardware.md) for instructions.**

## Pictures

![Wii menu frame](docs/images/frame.png)

> Example raw frame captured from the Wii home menu with a cheap HDMI capture card. There is a small overlay with information about the current input signal, which disappears after a few seconds. Note, that the native aspect ratio is not 16:9.

![picoAVE rev01](docs/images/finished_install.webp)

> The first hardware revision, designed to solder directly onto a prototype flex pcb. The main pcb contains a rp2040, voltage level shifter, flash memory and LDO regulator. There is a second pcb for the HDMI mini output, connected by a 16 pin FFC. Wires are needed for GND, 5V, 1.8V and CLK connections. Firmware is flashed over a SWD header on the bottom left.

![Original prototype](docs/images/prototype.webp)

> The original prototype, still based on an actual pico board. Because the CPU clock ran unsynchronized to the video input, the HDMI signal dropped every few seconds (pipeline ran out of data). There are two TXS0108E voltage shifters to adapt the 1.8V signal levels of the GPU to 3.3V of a pico. Below is a custom flex pcb soldered directly to the board's vias. The Wii2HDMI is only used to force the Wii into 480p output mode. Original [Reddit post](https://www.reddit.com/r/wii/comments/1d0bm9p/picoave_a_new_wii_hdmi_mod_i_am_working_on/).