Month: 2025-07 — AmbiqMicro/ambiqzephyr monthly summary. Key features delivered: SPI Non-Standard Frequency Support and Testing. Updated the NRFX SPIM driver to honor requested frequencies directly when hardware prescalers are available and added testing overlays and test cases to validate behavior across non-standard SPI rates. Commits included: d2393de9d9dec5b720e8c6fcb565e88935b0a959 (tests: drivers: spi: Add test cases for non standard frequencies) and 1b014bab64994bce109e7665ac4987108080abff (drivers: spi: nrfx_spim: Add support for non standard frequencies). Major bugs fixed: Addressed SPI frequency negotiation gaps; improved reliability by ensuring frequency requests are honored where hardware supports it; introduced testing overlays to enable deterministic validation and reduce test flakiness. Overall impact and accomplishments: Broadened SPI device interoperability across supported hardware, increased test coverage, and reduced manual customization needs for integrating SPI peripherals, enabling faster onboarding of new devices and drivers. Technologies/skills demonstrated: Embedded C, Zephyr RTOS, NRFX SPIM, SPI protocol, test automation with overlays, debugging and code quality improvements.

April 2025: For NordicBuilder/sdk-nrf, delivered MSPI driver stability improvements and updated HPF documentation. The work focused on reliability and data integrity in high-speed MSPI transfers, plus developer onboarding enhancements for HPF on the nRF54L15.

March 2025: NordicBuilder/sdk-nrf delivered a cohesive MSPI/SDP feature set to boost throughput, reliability, and capacity, enabling larger feature code/assets (e.g., Flipper). This included higher operation frequencies, stronger drive settings, no-copy RX paths, RX alignment refinements, a 32-bit RX mode refactor, and expanded memory partitions. Supporting fixes covered RX flow and code-size optimizations, enhancing stability and future scalability.

February 2025 — NordicBuilder/sdk-nrf: Delivered MSPI/SPI driver IPC refactor with multi-target support and introduced a no-copy IPC data transfer mode across MSPI components, plus targeted bug fixes to data integrity and timing. These updates reduce IPC overhead, enable multi-target deployments, and improve reliability for high-speed SPI transfers across SDP/NRFE.

January 2025 monthly summary for NordicBuilder/sdk-nrf. Delivered a high-impact MSPI feature set and resolved a critical build dependency issue, strengthening the MSPI data path, IPC capabilities, and overall build reliability. The work tightens the MSPI workflow, accelerates throughput, and sets up asynchronous messaging readiness across the MSPI stack.