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  Late last night, I found out one of the issues with my DisplayPort source. It turns out that the 300 µs timeout in the spec is a bit of a... guideline. The display I'm connected to responded in 307 µs for native writes. My AUX link layer was retrying repeatedly after 300 µs timeouts, and then failing after 7 retries. The real discovery was that if your firmware writes 0 to the timeout control register, then your AUX link will just retry immediately! Such unexpected behavior 😝

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  Ummm… I think I made a knob with too _little_ friction. This is at least an easier starting point than too much friction. I really don’t feel like mucking around with the greases and gels that professional encoders use though. Hmmm.

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  Fun mail arrived today!

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  I built a riser for the corner of my desk, and I think it really opens things up. The 6 GHz LeCroy SDA760Zi-A is perched above everything else surveying its domain. I probably need to move the microscope clamp mount a bit, but I think this is going to work!

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  I should always just search aliexpress before I start designing a board. $8 and shipped next week. Now I skip to working on my SpinalHDL DisplayPort IP.