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Notes from the board farm

Engineering write-ups on hardware-in-the-loop testing, embedded Rust, and running CI on real silicon.

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Jul 14, 2026 · Embedded Rust· 12 min read

On-target unit tests with defmt-test: from cargo test to real silicon

How defmt-test, semihosting, and OnMCU turn a Rust test suite running on a real microcontroller into an ordinary exit status that Cargo and CI already understand.

Nov 5, 2025 · Testing

Why do we even test?

Tests can show the presence of bugs, never their absence. What testing is actually for, what counts as an error, and when embedded code should panic.

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