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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 23 Dec 2020
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      Replying to @gsuberland

      Hey, uh, @esden? @whitequark? Uh... can I... can I redesign revC?

      4 replies 0 retweets 22 likes
    2. whitequark‏ @whitequark 23 Dec 2020
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      Replying to @marcan42 @gsuberland @esden

      (I've yet to watch the video) so like uh... is there an actual serious problem with revC or are you like memeing?

      1 reply 0 retweets 6 likes
    3. Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @whitequark @gsuberland @esden

      I'm, um, half memeing. I hope our board stackup is F-In1-In2-B (In1=GND plane under top side). That part is important @esden. It's actually not too bad, but given what I've learned from that video, I'd replace certain areas of the 3V3 In2 plane with more GND plane and add vias.

      2 replies 0 retweets 10 likes
    4. whitequark‏ @whitequark 23 Dec 2020
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      Replying to @marcan42 @gsuberland @esden

      yep, In1 is GND plane

      1 reply 0 retweets 2 likes
    5. Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @whitequark @gsuberland @esden

      I mean, I hope it's being fabbed in that order.

      1 reply 0 retweets 2 likes
    6. whitequark‏ @whitequark 23 Dec 2020
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      Replying to @marcan42 @gsuberland @esden

      uh, if my board house would randomly swap layers, I would simply fire them

      1 reply 0 retweets 7 likes
    7. Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @whitequark @gsuberland @esden

      Well, uh, it's all based on shitty gerber filenames and stuff so... there's a reason people usually specify this explicitly when sending boards off to fab.

      1 reply 0 retweets 2 likes
    8. Piotr Esden-Tempski @esden@chaos.social‏ @esden 23 Dec 2020
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      Replying to @marcan42 @whitequark @gsuberland

      I always do that

      1 reply 0 retweets 4 likes
    9. Piotr Esden-Tempski @esden@chaos.social‏ @esden 23 Dec 2020
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      Replying to @esden @marcan42 and

      Plus way more including thickness and and and

      1 reply 0 retweets 3 likes
    10. Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @esden @whitequark @gsuberland

      *Fiddles with an LED along the edge of your revC1* yeah I think we're safe :) So my recommendation for those trying to build a radio transmitter out of a Glasgow is to modulate the FPGA user LED pins. *cough* Also the port B OE lines are.... not great.

      2 replies 0 retweets 5 likes
      Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @marcan42 @esden and

      I think what will save use here is just how tiny the thing is, tbh. Did the iCE40 have configurable slew rates? Might want to poke around that with an SDR next to it some day, as a ghetto EMI experiment.

      8:40 PM - 23 Dec 2020
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      • Iris Johnson sww1235
      1 reply 0 retweets 2 likes
        1. whitequark‏ @whitequark 23 Dec 2020
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          Replying to @marcan42 @esden @gsuberland

          does not AFAIK

          0 replies 0 retweets 2 likes
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