DaisyOnline: Write Daisy DSP on the Web!

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DaisyOnline is a browser-based integrated development environment (IDE) for writing digital signal processing (DSP) programs for the Daisy hardware platform.

It enables real-time audio synthesis and effects development directly in your web browser, and browser-based deployment to Daisy hardware.

Features

• Browser-based C++ DSP development - Write audio processing code using familiar C++ syntax
• Real-time audio preview - Audition your DSP algorithms instantly using Web Audio API
• Client-side compilation - Powered by wasm-clang and wamrc — no server-side build required
• One-click hardware deployment - Flash compiled DSP modules directly to Daisy devices via WebUSB
• Monaco Editor - Professional code editing with syntax highlighting, IntelliSense-like features, and bracket matching
• LocalStorage persistence - Your code is saved in your browser and persists between sessions
• WebAssembly Micro Runtime (WAMR) - Runs your DSP code efficiently on Daisy's ARM Cortex-M7 processor

How It Works

1. Write C++ DSP Code - Implement init() and processSample() functions in the browser editor
2. Preview in Browser - Compile to WebAssembly and preview audio using Web Audio API
3. Deploy to Hardware - Compile to AOT binary and flash to Daisy via USB for standalone operation

Getting Started

🌐 Try Online (Recommended)

Visit https://jaffco.github.io/DaisyOnline - No setup required! Just open your browser and start coding C++ DSP.

🛠️ Run Locally

1. Clone this repository
2. Start the development server: npm start
3. Navigate to http://localhost:3000/ in your browser

Note: All compilation happens entirely in the browser. The first build may take a moment to download the compiler toolchain (~50 MB).

Project Structure

• src/ - Default DSP code template and user.h header
• fw/ - Daisy firmware build system (WAMR loader)
• test-module/ - Example DSP module with build/flash scripts
• firmware/ - Pre-built firmware binaries for flashing
• dfu/ - WebDFU libraries for USB flashing to Daisy
• wasm-micro-runtime/ - WAMR submodule for AOT compilation

Building Firmware

The Daisy firmware uses a custom WAMR (WebAssembly Micro Runtime) engine to execute your compiled DSP code. The static site provides pre-built firmware binaries in the firmware/ directory, but you can also build from source:

cd fw
make clean && make
make program-dfu  # Flash loader firmware to Daisy
# The firmware runs from SRAM, 
# so must be flashed to a Daisy with a bootloader installed.

Flashing DSP Modules

After writing your DSP code in the browser:

1. Click "Build & Run" to compile and preview
2. Click "Flash to Daisy" to compile to AOT and deploy to hardware

Requirements

• Modern web browser with WebAssembly and WebUSB support
• Daisy hardware with bootloader installed
• USB connection for flashing

Contributing

DaisyOnline is open source! Contributions are welcome:

• Report bugs or request features via GitHub Issues
• Submit pull requests for improvements
• Help improve documentation

License

MIT License - see LICENSE file for details.

Acknowledgments

• Built on wasm-clang for client-side C++ compilation
• Uses WebAssembly Micro Runtime (WAMR) for hardware execution
• Powered by Monaco Editor for the coding experience
• DFU flashing via WebDFU