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TL;DR: these compliance tests only look for the presence of an expected packet, not the ABSENCE of an unexpected one. I had to waste a few days refuting bad data because someone said "the box said green". Then had to spend two days explaining how broken the test was. :/
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I've posted the second article in a series on
@Medium . Case Studies in USB-C™ Debugging Analog and digital compliance of a PD-enabled monitor Let me know if you have any comments, or anything needing correction. WARNING: It's quite long and detailed.https://medium.com/@kolluru.nathan/case-studies-in-usb-c-debugging-bc919ee9034d?source=friends_link&sk=8ad5a66d9c6ea029bfde9679d5ee78e9 …Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
This... is disturbing. Perhaps there are two other books the school district admins should read: Nineteen Eighty-Four Fahrenheit 451 https://www.nytimes.com/interactive/2020/01/12/us/texas-vs-california-history-textbooks.html … Why not say 14th Amendment is "often debated"? Always refer to primary, peer-reviewed sources. https://qz.com/328913/martin-luther-king-jr-s-1963-letter-from-birmingham-jail-remains-relevant-today/ …
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Just saying, engineering this stuff (at least for USB-PD) is NOT trivial. Requires attention to detail, and working knowledge. Trust, but Verify. Perfectly safe if you know what you are doing. But companies cut corners for dumb reasons. Old as sin.https://www.androidpolice.com/2020/01/31/eu-to-consider-mandatory-common-charger-for-smartphones-paving-the-way-for-usb-c-domination/ …
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If anyone needs a Type-C debug specialist, let me know. I'm always looking for new opportunities and roles that offer growth, sustainability, and focus on product excellence.
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Fair warning,
@IKEA /@IKEAUSA , the LILLHULT cable you sell is not#USBC compliant. Type-A SHELL is unconnected. Plus excessive DCR resistance GND-GND. Can you please USB-IF Certify? And fix it? A good friend bought this, and is unhappy; so am I. Sent email to your helpline.pic.twitter.com/EYV5I3lmXQ
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Looks like the actual root cause was a bit worse. I still don't know if they fixed this. At least they provided patch notes. "Fix Thunderbolt SPI ROM Wear out issue." That's an "oops". Previous warnings still apply, but instead about "FWUPD"-atability.https://www.notebookcheck.net/Lenovo-statement-Thunderbolt-firmware-responsible-for-ThinkPad-USB-C-failures.451307.0.html …
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This, my friends, is a perfect lesson in supply and demand.https://www.motortrend.com/news/2020-chevrolet-corvette-c8-wheels-stolen-blocks/ …
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Guess what? Found another one. There's a charger, from a big company, that blows eFuse (crowbars the AC mains line) when it is run at international voltages/frequencies at a specific voltage PDO. Even if NOT run at max load, 50-70% of capacity. Validate your circuits, people!https://twitter.com/USBCGuy/status/1099942819643285504 …
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For clarity: the USB-IF discovered this AGES ago. Been a part of spec forever. Just a PSA to warn people to use the NEWEST spec PDF and CHECK if your silicon is compliant with the LATEST ECNs!! Some compliance DUT need "add-on" boards b/c of this. (3/2) http://e2e.ti.com/support/interface/f/138/t/538861?TPS25810-Source-VCONN-Discharge …
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I reported it ages ago. Hopefully fixed? Controller gets confused and sends VBUS down an unconnected cable. Not good. USB-IF changed spec because this. Added whole new FSM state in UnattachedWait.SRC in that ECN. Already-baked silicon chips CAN'T have it. Hence problem. (2/2)pic.twitter.com/Ov64wGv7UW
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Guess what system the pinned image of a
#TypeC receptacle in my profile came from? I suspect this fw update has to do with UnattachWait.SRC state and false detection. See "USB Type-C ECN for Source VCONN Discharge.pdf". TI has a EE page on it. (1/2)https://www.notebookcheck.net/Recent-Lenovo-ThinkPad-laptops-have-a-problem-with-defective-Thunderbolt-Controllers.451061.0.html …Prikaži ovu nitHvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
Shout out to the 2nd year Surgical Residents (and attendings) at
@UCDavisMedCntr and@60MDG_DGMC at@Travis60AMW . Without whom I would have never learned sleep is a somatic bodily function. Jokes aside, it's great experience for tech. Especially the M&M conferences...Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
I've posted the first article in a series on
@Medium . Case Studies in USB-C™ Debugging Patient 0: Analog and digital compliance of a PD-enabled product Let me know if you have any comments on the subject, or proposed corrections. Long-form there.https://medium.com/@kolluru.nathan/case-studies-in-usb-c-debugging-93cc3e8bbc0c?source=friends_link&sk=64517ae1f8ca1477b0a337c995042409 …Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
There's an RTOS microcontroller that is running out of space. I think it is because of an abundance of debug strings. Need to find way to compress the strings using SMASH and decode to RAM at boot. Problem is A | B fw copies need to be separate. :( I don't know what I'm doing.pic.twitter.com/tACmPPGcHZ
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I'm thinking of writing a
@medium technical article due to some "hiccups" coworkers & I have seen. Two options: (1) Applied issues of analog CC signal and TCPCI spec compliance (2) "Proper" state machine behavior for Power Reserve mgmt Public may be wrong audience... but hey.Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
Nathan K. proslijedio/la je Tweet
PSA: Avoid USB-C "Y-Split" cables or adapters. Evil ones can destroy 5V-only devices. https://www.reddit.com/r/UsbCHardware/comments/emf9yk/psa_avoid_usbc_ysplit_cables_or_adapters_evil/?utm_source=share&utm_medium=web2x …pic.twitter.com/Qgym2qUYzl
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For clarity and honesty:
@Microsoft has a document about this. But bugs are specifically "bugs" because they are unintended and unanticipated. https://docs.microsoft.com/en-us/windows/security/information-protection/kernel-dma-protection-for-thunderbolt … My opinion only, but a good question when approaching any technology is "what is the worst that could happen".Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
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