March 2026 Monthly Summary for renesas/zephyr focusing on the cellular modem driver: Key features delivered: - Bug fix: Corrected the CSQ_RSSI_TO_DB macro in the cellular modem driver to use the proper input parameter (v) instead of the rssi variable, eliminating reliance on an undefined local variable and improving signal strength accuracy. Commit: 90029d359f3144080960137d854f92983b1fd71f. Major bugs fixed: - Resolved inaccurate signal strength calculations in the cellular modem driver by fixing the CSQ_RSSI_TO_DB macro, leading to more reliable RSSI reporting and better connectivity metrics. Overall impact and accomplishments: - Improved cellular subsystem reliability and performance metrics, reducing potential customer-facing issues related to incorrect signal strength readings. - Demonstrated robust debugging, code quality, and collaboration through a focused, single-issue fix in a critical driver. - Strengthened maintainability of the Zephyr-based cellular driver with a clear, signed-off commit and documentation in the patch. Technologies/skills demonstrated: - Embedded C, macro-level debugging, and driver development in Zephyr RTOS. - Git-based version control, commit hygiene, and patch signing off. - Troubleshooting reliability in wireless connectivity subsystems and translating findings into a precise fix.

January 2026: Implemented build-time test for MAX2253x SPI ADCs in the nxp-upstream/zephyr repository, strengthening ADC driver regression coverage and build reliability. This work focused on testing framework enhancements and prepares the project for more robust SPI ADC support. No major bugs fixed this month; the impact was improved quality, earlier defect detection, and smoother integration for downstream deployments.

December 2025 focused on delivering the initial MAX2253x ADC driver integration with Zephyr, covering configuration options, register handling, and streaming data support. The work results in a robust driver enabling 4-channel, 12-bit isolated ADC data streaming within Zephyr, improving hardware onboarding and platform coverage. No major bugs fixed this month; the primary emphasis was on feature delivery, code quality, and documentation. Commit reference provided for traceability: 96f6dc50ac97ed7d5a3c5787ea25c810e33bdba3.