SWD Debug Probe for RP2350 RISC-V Cores Using Raspberry Pi Pico 2
By
jackdoe
The bagel they save for the regulars. Don't skim, savour.
Summary
This article describes a SWD (Serial Wire Debug) debug probe implementation for RP2350 RISC-V (Hazard3) cores using Raspberry Pi Pico 2 hardware. The project enables one Pico 2 microcontroller to debug another via just two GPIO wires. The author notes that about 80% of the code was 'vibe coded' (likely AI-assisted), with the readme mostly generated, but emphasizes that the core functionality was developed through hands-on work with oscilloscopes and documentation. The project includes a comprehensive test suite and is used in the author's own projects, though it comes with warnings about potential issues.
Key quotes
· 4 pulledSWD debug probe for RP2350 RISC-V (Hazard3) cores. One Pico2 debugs another via two GPIO wires.
About 80% of the code is vibe coded; The readme is almost completely generated (except the whole vibe-code-warning section).
I spent many nights with the oscilloscope and the docs and made a working prototype that was able to do sba/read/write regs and do abstract commands and progbuf, the rest was done with claude code.
The tests are quite comprehensive test suite and I use the core of the library in my own projects, but, as they say, 'hic sunt dracones'.
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