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Engineering Notes

Turning every pitfall
into something that runs

Field notes from automotive embedded work: AutoSAR BSW, communication matrices, build toolchains, and the process of putting AI agents into a real engineering loop. Every post ships runnable code and the actual failure record.

◆ Zero-dependency static site ◆ Bilingual ◆ Code is tested, not sketched

Not configured looks exactly like no problem at all

Building a CDD x ARXML diagnostic consistency checker: eight checks skipped themselves in silence while the report still read like a complete review, how the hardware acceptance filter decides which of the two files is wrong, and why a template default must never be treated as configuration.

AutoSAR UDS CDD Diagnostics Post-mortem

Three paths for one CAN frame

Reading a PuHua AutoSAR CP build from Com_SendSignal down to FlexCAN_Ip_Send: why SendSignal does not send the frame, why transmit confirmation is not part of the send call chain, and how one PduR boolean decides whether the loop closes.

AutoSAR Com CAN PduR Code reading

AI search engines could not see me

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 because there was none, s-maxage is only advice on Workers, and fixing a real bug moved the score by zero. Plus why the last 17 points cannot be coded.

GEO Structured data AI search Cloudflare Workers Measured data

105 errors. 99 of them were not real.

Building an ARXML x DBC consistency checker for an AI agent: a bit-geometry formula pointed the wrong way, a whole-network matrix produced 99 false errors, an empty DBC reported zero errors, and a fresh session found the doc bugs.

AutoSAR ARXML DBC Python Post-mortem

Designing an engineering-grade skill for an AI agent

A full design walkthrough of an AUTOSAR DBC audit skill: where the model/code boundary sits, what shape a skill takes, and how to make every claim verifiable. Includes a five-step method you can reuse.

AutoSAR DBC Python AI Agent Open source
Hand-written HTML / CSS · Cloudflare Workers me.tech-harry.top