
Piotr Krzyżanowski developed and enhanced embedded benchmarking and driver validation frameworks across NordicBuilder/sdk-nrf, AmbiqMicro/ambiqzephyr, and zephyrproject-rtos/zephyr repositories. He engineered multicore power measurement, dynamic frequency switching, and robust test automation for peripherals such as SPI, PWM, and GPIO, leveraging C, Device Tree, and Zephyr RTOS. His work included implementing LED-based activity visualization, YAML-driven test harnesses, and overlay-based hardware configuration to improve observability and reliability. By expanding edge-case test coverage and automating validation for new hardware platforms, Piotr delivered maintainable, data-driven solutions that accelerated performance analysis, reduced regressions, and strengthened production readiness in embedded systems.

October 2025: Delivered GPIO testing support for the NRF54H20 CPUPPR board by adding overlay files and configuring LED and GPIO hog settings to enable comprehensive GPIO driver tests and extend test coverage on new hardware, ensuring compatibility with existing test infrastructure.
October 2025: Delivered GPIO testing support for the NRF54H20 CPUPPR board by adding overlay files and configuring LED and GPIO hog settings to enable comprehensive GPIO driver tests and extend test coverage on new hardware, ensuring compatibility with existing test infrastructure.
July 2025 monthly summary for AmbiqMicro/ambiqzephyr focusing on test automation and validation. Delivered extended API test coverage for clock control and enhanced PWM loopback tests across NRF platforms. These efforts strengthen reliability, early defect detection, and platform confidence ahead of production releases.
July 2025 monthly summary for AmbiqMicro/ambiqzephyr focusing on test automation and validation. Delivered extended API test coverage for clock control and enhanced PWM loopback tests across NRF platforms. These efforts strengthen reliability, early defect detection, and platform confidence ahead of production releases.
May 2025 monthly wrap-up: Expanded SPI loopback test coverage in AmbiqMicro/ambiqzephyr by adding a NULL buffer test, strengthening driver reliability and edge-case handling with minimal maintenance. Validates spi_loopback_transceive behavior when both TX and RX buffers are NULL, reducing risk of regressions in SPI paths and improving production confidence.
May 2025 monthly wrap-up: Expanded SPI loopback test coverage in AmbiqMicro/ambiqzephyr by adding a NULL buffer test, strengthening driver reliability and edge-case handling with minimal maintenance. Validates spi_loopback_transceive behavior when both TX and RX buffers are NULL, reducing risk of regressions in SPI paths and improving production confidence.
April 2025 performance summary for NordicBuilder/sdk-nrf: Delivered expanded low-power measurement capabilities and robust test coverage for LFRC clock sources and SPI wakeup, with targeted bug fixes that improve measurement accuracy, benchmarking reliability, and data-driven optimization of Nordic SoCs.
April 2025 performance summary for NordicBuilder/sdk-nrf: Delivered expanded low-power measurement capabilities and robust test coverage for LFRC clock sources and SPI wakeup, with targeted bug fixes that improve measurement accuracy, benchmarking reliability, and data-driven optimization of Nordic SoCs.
February 2025 performance-focused iteration in NordicBuilder/sdk-nrf, driving cross-peripheral testing of dynamic Global Domain frequency switching and stabilizing multicore benchmarks.
February 2025 performance-focused iteration in NordicBuilder/sdk-nrf, driving cross-peripheral testing of dynamic Global Domain frequency switching and stabilizing multicore benchmarks.
January 2025 monthly summary for NordicBuilder/sdk-nrf: Delivered Benchmarking Instrumentation and Test Suite Enhancements to improve visibility, measurement accuracy, and validation in multicore Nordic builds. Implemented visual LED indicators in multicore benchmarks for core/activity visualization and introduced a fast TIMER validation test suite to measure elapsed time across clock frequencies. The work is tracked by commits 750ddf47271c8169f1a4d01f7204db72a6db474c and 50601fe5dd4ff3a0e0b1c13edd35c989510ecfaf. Impact: faster performance analysis, quicker debugging, and more reliable multicore benchmarking; enables data-driven optimization and improved release readiness.
January 2025 monthly summary for NordicBuilder/sdk-nrf: Delivered Benchmarking Instrumentation and Test Suite Enhancements to improve visibility, measurement accuracy, and validation in multicore Nordic builds. Implemented visual LED indicators in multicore benchmarks for core/activity visualization and introduced a fast TIMER validation test suite to measure elapsed time across clock frequencies. The work is tracked by commits 750ddf47271c8169f1a4d01f7204db72a6db474c and 50601fe5dd4ff3a0e0b1c13edd35c989510ecfaf. Impact: faster performance analysis, quicker debugging, and more reliable multicore benchmarking; enables data-driven optimization and improved release readiness.
December 2024 monthly summary for NordicBuilder/sdk-nrf focusing on power measurement observability improvements in multicore benchmarks.
December 2024 monthly summary for NordicBuilder/sdk-nrf focusing on power measurement observability improvements in multicore benchmarks.
2024-11 Monthly Summary for NordicBuilder/sdk-nrf: Expanded benchmarking capabilities and improved stability, delivering clock control-enabled peripheral_load tests and a new power-consumption benchmark suite, while removing an obsolete Global Power Domains workaround to streamline CI. These efforts enhanced measurement accuracy, reduced flaky test behavior, and provided actionable data for hardware performance optimization.
2024-11 Monthly Summary for NordicBuilder/sdk-nrf: Expanded benchmarking capabilities and improved stability, delivering clock control-enabled peripheral_load tests and a new power-consumption benchmark suite, while removing an obsolete Global Power Domains workaround to streamline CI. These efforts enhanced measurement accuracy, reduced flaky test behavior, and provided actionable data for hardware performance optimization.
Concise monthly summary for 2024-10 highlighting delivered features, testability improvements, and cross-repo collaboration in embedded power/perf benchmarks. Focused on business value from power benchmarking and testability improvements across two repositories.
Concise monthly summary for 2024-10 highlighting delivered features, testability improvements, and cross-repo collaboration in embedded power/perf benchmarks. Focused on business value from power benchmarking and testability improvements across two repositories.
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