T-DSP Software

Firmware and software for the T-DSP audio hardware ecosystem.

T-DSP is open-source audio hardware built around the Teensy Audio Library — Teensy 4.1 + ESP32 + the TAC5212 codec, with swappable I/O modules. This repository hosts the firmware that runs on each T-DSP product, plus shared libraries and applications built on top.

Looking for the hardware? See t-dsp.com and the KiCad repos linked below.

Projects

Project	Description
hello-world	First-time setup guide and a minimal Teensy 4.1 sketch to verify your dev environment, board, and toolchain. Start here.
t-dsp_tac5212_audio_shield_adaptor	Firmware for the TAC5212 Audio Shield Adaptor — Teensy 4.1 carrier for the T-DSP TAC5212 Pro Audio Module. USB Audio class device with stereo DAC playback, PDM mic + line-in capture, host volume tracking, and live monitoring.

Repository Structure

t-dsp_software/
├── projects/                 ← individual PlatformIO projects per board/product
│   ├── hello-world/          ← setup guide + sanity check
│   └── t-dsp_tac5212_audio_shield_adaptor/
│       ├── src/
│       └── platformio.ini
├── lib/                      ← shared libraries (used across projects)
├── LICENSE                   ← MIT
└── README.md

Each project under projects/ is a self-contained PlatformIO project with its own platformio.ini, src/, and README.md. Shared code lives at the repo root in lib/ and is referenced via lib_extra_dirs in each project's platformio.ini.

Getting Started

If this is your first time, head to hello-world for a complete setup walkthrough — installing PlatformIO, configuring VS Code, and flashing your first Teensy.

For experienced PlatformIO users, the workflow is:

cd projects/<project-name>
python -m platformio run                    # build
python -m platformio run --target upload    # upload to Teensy
python -m platformio device monitor         # serial monitor

T-DSP Hardware Repositories

Hardware schematics, PCBs, and BOMs are in their own KiCad repos under the T-DSP organization. The active hardware projects:

Repository	Description
t-dsp_core	4-layer audio backplane — Teensy 4.1 + ESP32 + TAC5212 codec module
t-dsp_desktop_pro	8-layer desktop backplane with USB Audio, MIDI, and S/PDIF
t-dsp_tac5212_pro_audio_module	TAC5212 stereo codec module — ADC/DAC, mic preamp, headphone amp
t-dsp_tac5212_audio_shield_adaptor	Teensy Audio Shield-style adaptor for the TAC5212 module
t-dsp_io_2x2_combo	Balanced 2-in/2-out interface — XLR outputs, combo XLR/TRS inputs
t-dsp_mic_array_module	Microphone array module

The current dev target for this repository is the Teensy 4.1 paired with the TAC5212 Pro Audio Module, on the TAC5212 Audio Shield Adaptor carrier.

License

MIT — © 2026 Jay Shoemaker / T-DSP

The hardware designs in the sibling KiCad repositories are licensed under CC BY-NC-SA 4.0; the software in this repository is MIT.