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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. OSS FPGA & ASIC EDA tools‏ @ico_TC 2 Sep 2020
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      The question remains, what is the bigger crap: USB or Bluetooth?

      13 replies 3 retweets 30 likes
    2. This Tweet is unavailable.
    3. OSS FPGA & ASIC EDA tools‏ @ico_TC 2 Sep 2020
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      Replying to @tnt

      I am complaining about real world implementation of those standards by products I can buy.

      2 replies 0 retweets 1 like
    4. Felix Domke‏ @tmbinc 2 Sep 2020
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      Replying to @ico_TC @tnt

      USB's biggest crap-factor is that it's cheap. BOM cost correlates to profit, and profit correlates with the ability to R&D. The low cost of USB devices leads to under-engineered, under-tested crappy implementations of (relatively) complex USB protocols/products.

      1 reply 0 retweets 2 likes
    5. Felix Domke‏ @tmbinc 2 Sep 2020
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      Replying to @tmbinc @ico_TC @tnt

      I.e. for every good {USB hub, video capture, UART, mass storage, ...} chipset, a cheaper&more crappy version will eventually take over the market. It's a race to the bottom. The good stuff still exists, but not in a meaningful quantity anymore.

      1 reply 0 retweets 3 likes
    6. Hector Martin‏ @marcan42 2 Sep 2020
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      Replying to @tmbinc @ico_TC @tnt

      USB (1/2) is designed to be as hostile as possible to any audio system, being impossible to galvanically isolate without massive expense, and introducing common mode ground currents at precisely the most sensitive part of the human audible spectrum. Fuck USB.

      1 reply 2 retweets 16 likes
    7. Hector Martin‏ @marcan42 2 Sep 2020
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      Replying to @marcan42 @tmbinc and

      No joke USB is single-handedly responsible for a massive fraction of horrible interference and background noise in amateur and professional audio productions alike. Any time you hear a 1kHz whine in the background, that's USB.

      1 reply 3 retweets 14 likes
    8. Hector Martin‏ @marcan42 2 Sep 2020
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      Replying to @marcan42 @tmbinc and

      USB3 fixed this problem, but neglected to specify USB2 to USB3 transaction translation, which is a massive lost opportunity to fix the galvanic isolation problem for USB2 cheaply, and nobody puts USB3 on low channel count audio interfaces, so we're still fucked.

      2 replies 3 retweets 11 likes
    9. Hector Martin‏ @marcan42 2 Sep 2020
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      Replying to @marcan42 @tmbinc and

      So yeah, no, sorry, the USB design isn't "quite good", it's complete shit. It's not differential (not fully), it's not extensible/virtualizable/tunnelable (not properly), utilization sucks, rate control sucks, speed is data-dependent, it's overcomplicated, etc etc etc.

      1 reply 3 retweets 12 likes
      Hector Martin‏ @marcan42 2 Sep 2020
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      Replying to @marcan42 @tmbinc and

      Try building or debugging a few (low level) USB devices or doing anything interesting with USB and you'll realize how complete crap it is. I've written a virtual USB controller, I've worked with maybe a dozen deviceside impls, worked on a USB sniffer... I've had enough of it.

      9:38 PM - 2 Sep 2020
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      • 5 Likes
      • серафими многоꙮчитїи solid cilia 黒田 東彦 stan whitequark Mubarak AlQahtani
      1 reply 2 retweets 5 likes
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        1. Andrew Zonenberg‏ @azonenberg 2 Sep 2020
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          Replying to @marcan42 @tmbinc and

          I've worked enough with USB to know that I'm very glad to be living in the land of Ethernet and TCP/IP where things run over fiber or twisted pair, are always galvanically isolated and fully differential, can run over anything from point to point to a complex routed VPN...

          1 reply 0 retweets 8 likes
        2. Hector Martin‏ @marcan42 2 Sep 2020
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          Replying to @azonenberg @tmbinc and

          Honestly, if you need to tunnel USB through somewhere/isolate it, probably the only standards-compliant (hardware) mechanism is to just put an xHCI USB controller on the device end, then tunnel *PCIe* via whatever you want.

          1 reply 2 retweets 12 likes
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