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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. Hector Martin‏ @marcan42 17 Aug 2018
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      I swear everything about this makes perfect sense and serves a purpose.pic.twitter.com/GWAhaoeSig

      5 replies 12 retweets 70 likes
      Show this thread
    2. Hector Martin‏ @marcan42 17 Aug 2018
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      So Behringer makes this nifty set of digital wireless mics with a USB dongle form factor receiver. Sadly, the Switch does not like it (probably because it only supports 48kHz 24bit stereo mode).

      1 reply 0 retweets 6 likes
      Show this thread
    3. Hector Martin‏ @marcan42 17 Aug 2018
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      However, it has an undocumented analog mode, which uses the SuperSpeed pins on a USB 3.0 Type A connector (even though this isn't 3.0) for analog audio and status, to work with some Behringer mixers. So I broke it out to minijack stereo (two mics, two channels).

      4 replies 1 retweet 10 likes
      Show this thread
    4. SEGFAULT (Lauren)‏ @altsegcat 18 Aug 2018
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      Replying to @marcan42

      How does it behave if you plug it into a female USB 3.0 jack, where those pins actually connect?

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 18 Aug 2018
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      Replying to @altsegcat

      It works as USB 2.0. USB 3.0 isn't going to exactly think that some analog audio is a proper SuperSpeed negotiation, and as soon as USB 2.0 negotiation starts it shuts down the audio/status output anyway.

      1 reply 0 retweets 0 likes
    6. SEGFAULT (Lauren)‏ @altsegcat 18 Aug 2018
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      Replying to @marcan42

      Interesting. I find the idea of using spare USB 3 pins on the host side for a side channel an interesting idea for adding a debug channel etc.

      1 reply 0 retweets 0 likes
    7. SEGFAULT (Lauren)‏ @altsegcat 18 Aug 2018
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      Replying to @altsegcat @marcan42

      The host initiates 3.0 negotiation, right? So if a device is plugged in it would ignore garbage coming out of the 3 lines until it was told to negotiate?

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 18 Aug 2018
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      Replying to @altsegcat

      I actually don't know how SuperSpeed negotiation works, looking it up now.

      1 reply 0 retweets 0 likes
    9. Hector Martin‏ @marcan42 18 Aug 2018
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      Replying to @marcan42 @altsegcat

      Ugh, this is worse than USB 2.0. I don't know what I expected. So there's some low-frequency signaling they use to negotiate, but it's completely silly (and they didn't even future-proof it so they had to tack on another modulation scheme to advertise SuperSpeedPlus).

      3 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 18 Aug 2018
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      Replying to @marcan42 @altsegcat

      You'd think after *three* different signaling speeds with tacked on "hey I'm actually a newer standard" backdoor signals (HS chirp last time) they'd have learned to stick a freaking capability byte in there somewhere, but no.pic.twitter.com/VcM12pyG4d

      4:30 AM - 18 Aug 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Hector Martin‏ @marcan42 18 Aug 2018
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          Replying to @marcan42 @altsegcat

          Seriously, what the hell is this shit. Running RS485 with smaller signal levels for low-power initial negotiation would've made 20 times more sense than this mess.pic.twitter.com/9oMrJegueY

          1 reply 0 retweets 0 likes
        2. SEGFAULT (Lauren)‏ @altsegcat 18 Aug 2018
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          Replying to @marcan42

          Well the U is for unintelligible, clearly.

          1 reply 0 retweets 0 likes
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