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Eric Ratliff 61f4659462 Arduino CLI build system with HAL-based test architecture
Build and upload tool (arduino-build.sh):
- Compile, upload, and monitor via arduino-cli
- Device discovery with USB ID identification (--devices)
- Persistent reconnecting serial monitor (--watch)
- Split compile/upload workflow (--verify, --upload-only)
- First-time setup wizard (--setup)
- Comprehensive --help with troubleshooting and RedBoard specs

Testable application architecture:
- Hardware abstraction layer (lib/hal/) decouples logic from Arduino API
- Google Mock HAL for unit tests (exact call verification)
- Simulated HAL for system tests (GPIO state, virtual clock, I2C devices)
- Example I2C temperature sensor simulator (TMP102)
- Host-side test suite via CMake + Google Test (21 tests)

Example sketch:
- blink/ -- LED blink with button-controlled speed, wired through HAL
2026-02-14 09:50:13 -06:00

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# Build artifacts (arduino-cli output)
/tmp/arduino-build/
*.elf
*.hex
*.bin
*.map
*.eep
# Compiled object files
*.o
*.d
# Arduino IDE (if someone opens it there)
build/
*.ino.cpp
# Editor files
.vscode/c_cpp_properties.json
.vscode/ipch/
*.swp
*.swo
*~
.idea/
*.sublime-workspace
# OS junk
.DS_Store
Thumbs.db