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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 4 Apr 2019
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      <@whitequark> does anyone want to debug a horrible USB issue? <@whitequark> <...> BULK IN URBs not finishing <me> is this a ZLP issue? *pulls out OpenVizsla* It was a ZLP issue. #USBNotEvenOncepic.twitter.com/ymXVirIXsG

      4 replies 4 retweets 61 likes
    2. Felix Domke‏ @tmbinc 4 Apr 2019
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      Replying to @marcan42 @whitequark

      Whenever I see OpenVizsla being used for real USB work I have creeping flashbacks to when I - like uh, 20 years ago - evangelized Desktop Linux; some projects may better be kept in a proof-of-concept stage. But maybe it wasn't _that_ bad? (OpenVizsla, I mean. KDE 1 surely was.)

      1 reply 0 retweets 4 likes
    3. Hector Martin‏ @marcan42 4 Apr 2019
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      Replying to @tmbinc @whitequark

      Both OV1 and KDE1 were disasters, and both became usable by version 3 :-)

      1 reply 0 retweets 3 likes
    4. Felix Domke‏ @tmbinc 4 Apr 2019
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      Replying to @marcan42 @whitequark

      Did you realize an XMOS would be perfect for Glasgow as well? You get deterministic, event-driven IO, and you can program it in a C-like language, so no need to mess with RTL. XMOS has excellent USB support as well. You really should use that. It's great!

      1 reply 0 retweets 0 likes
    5. whitequark‏ @whitequark 4 Apr 2019
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      Replying to @tmbinc @marcan42

      I don't think "programming in a C-like language" is inherently an advantage (quite the opposite!), but more importantly, while XMOS can probably match HX8K on many tasks, I don't think it can match ECP5

      1 reply 0 retweets 3 likes
    6. Felix Domke‏ @tmbinc 4 Apr 2019
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      Replying to @whitequark @marcan42

      Sorry, that was meant to be ironic: OV1 used XMOS and was quite the disaster. OV3 switched to an FT2232H+FPGA, using migen and python, and was a wonderful universal development platform. XMOS performs great on paper but projects eventually fail for stupid (but valid) reasons.

      1 reply 0 retweets 3 likes
    7. whitequark‏ @whitequark 4 Apr 2019
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      Replying to @tmbinc @marcan42

      oh. yeah I've never given XMOS more than a passing look, so I haven't even suspected it was supposed to be sarcastic.

      1 reply 0 retweets 1 like
    8. Hector Martin‏ @marcan42 4 Apr 2019
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      Replying to @whitequark @tmbinc

      As far as I can tell the sole decent use case for XMOS is USB audio (or maybe other audio). I have a DIY DSP thing running my speakers using an XMOS and it has better latency (0.25ms analog-to-analog, ish) than ~every high-end DSP box you can buy.

      1 reply 0 retweets 5 likes
    9. Hector Martin‏ @marcan42 4 Apr 2019
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      Replying to @marcan42 @whitequark @tmbinc

      That's running 15 biquad EQ filters × 6 channels at 96kHz 32bit internal resolution (24bit codec), on two XMOS chips. Good luck getting that latency on a traditional DSP. But for anything else? Stay far, far, FAR away from XMOS.

      1 reply 0 retweets 7 likes
    10. Kevin Mehall‏ @kevinmehall 4 Apr 2019
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      Replying to @marcan42 @whitequark @tmbinc

      In 2013 @0x111a and I designed a board that was essentially Glasgow (even the same 74LVC1T45 level translation), except with XMOS for lack of an open FPGA toolchain, and quickly came to the same assessment of the XMOS ecosystem.pic.twitter.com/eIiwtR8FBE

      1 reply 0 retweets 5 likes
      Hector Martin‏ @marcan42 4 Apr 2019
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      Replying to @kevinmehall @whitequark @tmbinc

      At least you weren't crazy enough to try to use that cursed dual-row QFN package.

      9:43 PM - 4 Apr 2019
      • 2 Likes
      • hell writes memory initialization code for fun whitequark
      1 reply 0 retweets 2 likes
        1. New conversation
        1. Kevin Mehall‏ @kevinmehall 4 Apr 2019
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          Replying to @marcan42 @whitequark @tmbinc

          Yeah, well the XS1-U8 we designed in wasn't actually purchasable in quantity at the time, and its integrated USB transceiver required a new version of the binary blob USB stack that clearly hadn't been tested with anything besides their audio class example.

          2 replies 0 retweets 3 likes
        2. Kevin Mehall‏ @kevinmehall 4 Apr 2019
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          Replying to @kevinmehall @marcan42 and

          Anyway, the software side of that project turned into https://github.com/signalspec/signalspec …, which is still very much vaporware, but I really want to get it into a state where it can be useful with Glasgow.

          0 replies 1 retweet 6 likes
          3. End of conversation

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