nxp-upstream/zephyr
Jan 2026 – Jan 2026
1 Month active
Languages Used
C
Technical Skills
C programmingdriver developmentembedded systems
Marco Widmer
PROFILE
Marco Widmer
Worked across Zephyr-based repositories to deliver robust embedded systems features and reliability improvements. Developed flexible GPIO pull-up and pull-down support for PCA953x devices in renesas/zephyr, enhancing hardware configurability through C and device-tree integration. In AmbiqMicro/ambiqzephyr, addressed Bluetooth subsystem teardown and hardened test automation using Python scripting, improving CI coverage reliability. Contributed concurrency fixes to nrfconnect/sdk-zephyr’s networking stack, resolving race conditions in net_context management with careful mutex handling. Enhanced UART driver stability in nxp-upstream/zephyr by refining interrupt processing and synchronizing register access. Demonstrated depth in C programming, driver development, and test automation, focusing on maintainable, production-ready solutions.
Overall Statistics
Feature vs Bugs
25%Features
Repository Contributions
8Total
Bugs
6
Commits
8
Features
2
Lines of code
136
Activity Months4
Your Network
1194 peopleSame Organization
@bytesatwork.ch1
Work History
January 2026
3 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for nxp-upstream/zephyr focusing on CMSDK APB UART driver improvements, including RX interrupt priming, reliability fixes, and concurrency stability.
3 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for nxp-upstream/zephyr focusing on CMSDK APB UART driver improvements, including RX interrupt priming, reliability fixes, and concurrency stability.
January 2026
December 2025
1 Commits
Dec 1, 2025December 2025: Stabilized the Zephyr networking stack in the nrfconnect/sdk-zephyr repository by delivering a critical concurrency fix that improves runtime reliability and prevents production-time assertion failures. The work focused on net_context handling, addressing a race condition in multi-threaded scenarios and ensuring robust mutex lifecycle management.
December 2025
1 Commits
Dec 1, 2025December 2025: Stabilized the Zephyr networking stack in the nrfconnect/sdk-zephyr repository by delivering a critical concurrency fix that improves runtime reliability and prevents production-time assertion failures. The work focused on net_context handling, addressing a race condition in multi-threaded scenarios and ensuring robust mutex lifecycle management.
August 2025
2 Commits • 1 Features
Aug 1, 20252025-08 monthly summary for renesas/zephyr: Delivered new GPIO flexibility via PCA953x pull-up/pull-down support and resolved parallel coverage conflicts in CI, improving hardware configurability and test reliability.
2 Commits • 1 Features
Aug 1, 20252025-08 monthly summary for renesas/zephyr: Delivered new GPIO flexibility via PCA953x pull-up/pull-down support and resolved parallel coverage conflicts in CI, improving hardware configurability and test reliability.
August 2025
June 2025
2 Commits
Jun 1, 2025June 2025: Delivered two high-impact bug fixes in AmbiqMicro/ambiqzephyr that enhance test coverage reliability and Bluetooth subsystem correctness. These changes reduce flaky test results on slower machines, ensure proper teardown of the Pytest Twister harness, and fix ticker state management during Bluetooth deinitialization, contributing to overall product reliability and maintainability.
June 2025
2 Commits
Jun 1, 2025June 2025: Delivered two high-impact bug fixes in AmbiqMicro/ambiqzephyr that enhance test coverage reliability and Bluetooth subsystem correctness. These changes reduce flaky test results on slower machines, ensure proper teardown of the Pytest Twister harness, and fix ticker state management during Bluetooth deinitialization, contributing to overall product reliability and maintainability.
Activity
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Quality Metrics
Correctness93.8%
Maintainability87.4%
Architecture87.4%
Performance85.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
CPython
Technical Skills
BluetoothBuild SystemsC programmingCI/CDDevice DriversDriver DevelopmentEmbedded SystemsGPIOI2CPython ScriptingTest AutomationTestingconcurrent programmingdriver developmentembedded systems
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline
AmbiqMicro/ambiqzephyr
Jun 2025 – Jun 2025
1 Month active
Languages Used
CPython
Technical Skills
BluetoothCI/CDDriver DevelopmentEmbedded SystemsPython ScriptingTest Automation
renesas/zephyr
Aug 2025 – Aug 2025
1 Month active
Languages Used
CPython
Technical Skills
Build SystemsCI/CDDevice DriversEmbedded SystemsGPIOI2C
nrfconnect/sdk-zephyr
Dec 2025 – Dec 2025
1 Month active
Languages Used
C
Technical Skills
C programmingconcurrent programmingembedded systems