https://me.tech-harry.top/blog/index.en.html Engineering notes on automotive embedded software, AutoSAR toolchains, and putting AI agents into real engineering workflows. en Fri, 06 Nov 2026 11:00:00 +0800 https://me.tech-harry.top/blog/cdd-arxml-consistency.en.html https://me.tech-harry.top/blog/cdd-arxml-consistency.en.html Fri, 06 Nov 2026 11:00:00 +0800 Harry Zhao AUTOSAR UDS CDD Diagnostics Building a CDD x ARXML diagnostic consistency checker: eight checks skipped themselves in silence while the report still read like a complete review, because "the report never mentioned CAN ids" and "the CAN ids are fine" are the same string on a terminal. Plus how the hardware acceptance filter decides which of the two files is wrong, and why a template default must never be treated as configuration. https://me.tech-harry.top/blog/com-send-receive-chain.en.html https://me.tech-harry.top/blog/com-send-receive-chain.en.html Thu, 05 Nov 2026 19:00:00 +0800 Harry Zhao AUTOSAR Com CAN Reading a PuHua AutoSAR CP build: sending, transmit confirmation and reception are three independent paths driven by three different main functions. Confirmation is not nested inside the send call. Includes the one PduR boolean that decides whether the loop closes. https://me.tech-harry.top/blog/geo-audit.en.html https://me.tech-harry.top/blog/geo-audit.en.html Thu, 05 Nov 2026 18:00:00 +0800 Harry Zhao GEO Structured Data AI Search A GEO audit of my own blog and GitHub repository: the English half did not exist as far as a crawler was concerned, structured data scored 12, s-maxage did nothing on Workers, and a real bug fix moved the score by zero. The last 17 points cannot be reached by writing code. https://me.tech-harry.top/blog/arxml-dbc-consistency.en.html https://me.tech-harry.top/blog/arxml-dbc-consistency.en.html Thu, 05 Nov 2026 00:00:00 +0800 Harry Zhao AUTOSAR CAN FD Static analysis Building an AUTOSAR ARXML × DBC consistency checker for an AI agent. The first version reported 105 errors on a real project; checking them one by one, 99 were false — the matrix described a whole 11-node network and most frames had nothing to do with this ECU. False positives are worse than misses: nobody reads past line one hundred. https://me.tech-harry.top/blog/dbc-matrix-audit-skill.en.html https://me.tech-harry.top/blog/dbc-matrix-audit-skill.en.html Wed, 04 Nov 2026 00:00:00 +0800 Harry Zhao AI Agent Skill engineering AUTOSAR Requirement boundaries, architecture, skill shape and quality system: the complete design process behind an AUTOSAR DBC audit skill, with a reusable five-step method.