This repository contains a proof-of-concept project that demonstrates how to use a WIZnet W55RP20 (ioNIC) chip as a webserver to handle firmware upgrades for a target MCU (like the Raspberry Pi Pico).
- Webserver: Serves a simple HTML page to upload new firmware images.
- SWD Programming: Uses a ported version of the SWDLoader tool (from the Circle project) to program the target MCU over SWD.
- Target Firmware: Example tested with a simple blink firmware.
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Buffer: Statically assigned
30*1024bytes (enough for small tests). -
SWDLoader Integration: Interface file bridges C++ (SWDLoader) and C (webserver) code.
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Firmware Preprocessing: Custom Python script for firmware conversion (since Circle’s tool wasn’t available).
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Target MCU Configuration:
Add this line in theCMakeLists.txtof your target firmware project:pico_set_binary_type(PROJECT no_flash)
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Flash Reset: Use a special UF2 file (link) to erase flash before flashing to RAM.
- Build the firmware and webserver code for your W55RP20-based board.
- Connect the target MCU via SWD.
- Power up and connect the board to Ethernet.
- Open the web interface in a browser and upload the firmware binary.
- The board writes the firmware to the target MCU’s RAM and runs it.
Check out the project in action here: [YouTube video link]
This project is not production-ready. In real-world applications, you’d want to integrate cloud-based storage, MQTT brokers, or secure authentication to make firmware upgrades reliable and secure.