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* chore(deps): update rpi-rgb-led-matrix to latest upstream for Pi 5 support Configure submodule to track upstream master branch (branch = master in .gitmodules) so future updates are a single 'git submodule update --remote' rather than manual SHA management. Update first_time_install.sh to use --remote flag so fresh installs always pull the current upstream master, not the commit recorded at clone time. Current upstream HEAD (8907235) brings: - PR #1886: Raspberry Pi 5 support — new RP1 PIO and RIO backends. The library auto-detects Pi 5 hardware at runtime; no config change required for basic operation. adafruit-hat-pwm is confirmed supported on Pi 5. - PR #1833: setup.py migrated from distutils → setuptools, fixing Python 3.12+ build failure (Pi runs Python 3.13). Previous version could not build the bindings at all on current Pi OS. Expose new rp1_rio option in display_manager.py and config.template.json: 0 (default) = PIO mode — uses Pi 5 RP1 coprocessor, minimal CPU usage 1 = RIO mode — Registered IO, faster throughput, higher CPU; note that gpio_slowdown has inverted effect in this mode No API changes to RGBMatrix, RGBMatrixOptions, or FrameCanvas. Pi 4 and earlier hardware is unaffected — rp1_rio is silently ignored on non-Pi-5. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * chore(deps): update rpi-rgb-led-matrix install for new scikit-build-core system The library migrated from 'make build-python' + 'pip install bindings/python' to a scikit-build-core + cmake build where the entire repo root is pip- installable via 'pip install .'. Update first_time_install.sh accordingly: - Remove the 'make build-python' step (target no longer exists) - Install directly from the repo root instead of bindings/python - Replace build deps: remove cython3/scons/python3-dev, add python-dev-is-python3 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix: deterministic submodule install + guard rp1_rio for older rgbmatrix first_time_install.sh: remove --remote from both git submodule update calls so first-time installs check out the pinned commit recorded in the repo rather than whatever upstream master happens to be at install time. The branch = master config in .gitmodules reserves --remote for an explicit maintainer upgrade (git submodule update --remote). display_manager.py: guard rp1_rio assignment with hasattr() so setting the option in config does not cause an AttributeError and silently fall through to emulator mode when running against RGBMatrixEmulator or an older rgbmatrix build that predates the Pi 5 property. Emit a warning instead so the operator knows the value was ignored. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> --------- Co-authored-by: Chuck <chuck@example.com> Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>