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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. whitequark‏ @whitequark May 1

      wtf y'all don't have too much faith in me -____-

      3 replies 0 retweets 6 likes
      Show this thread
    2. whitequark‏ @whitequark May 1

      well. it lights up the power LED, which means that the 3V3 power rail is ok. it does not enumerate. :/

      1 reply 0 retweets 7 likes
      Show this thread
    3. whitequark‏ @whitequark May 1

      AAAAAAAA i assumed ONE THING in this design. i assumed that the industry would get its shit together for one single component, crystal, and actually have a consistent pinout i assumed wrong. screw you too, industry.pic.twitter.com/ToVaD7EMju

      4 replies 0 retweets 40 likes
      Show this thread
    4. whitequark‏ @whitequark May 1

      well I rotated the crystal and it kind of works now. the FPGA doesn't configure, and I think I can't figure that out without a scope enjoy this multi-colored super-bright retina-burning glory I spent a *lot* of time carefully matching LEDs to be equally bright...pic.twitter.com/3WsOyna35s

      3 replies 0 retweets 31 likes
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    5. whitequark‏ @whitequark May 1

      I've configured the FPGA and talked to it via I2C! The issue was that a certain pin would tristate instead of going high because of an unknown issue. on the prototype I had a pullup, and on the board I have a pulldown, so I haven't discovered this before.

      1 reply 0 retweets 18 likes
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    6. whitequark‏ @whitequark May 1

      so... pretty much everything that I'm geared up to test right now works. the only thing that needed fixing was rotating the crystal. I'm calling this a massive success

      7 replies 0 retweets 34 likes
      Show this thread
    7. whitequark‏ @whitequark May 1

      found the cause of the issue with FPGA configuration: solder bridge so tiny I would have never found it by visual analysis; had to look at layout, identify potential shorts and clean them

      2 replies 1 retweet 17 likes
      Show this thread
    8. whitequark‏ @whitequark May 1

      yes I do in fact have "this was a triumph" playing in my head right now thank you very much everyone

      3 replies 0 retweets 35 likes
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    9. whitequark‏ @whitequark May 1

      assembled: 1 to assemble: ??? (yes my SMD hand soldering skills are horrible deal with it)pic.twitter.com/7eLJHcPvjC

      8 replies 2 retweets 43 likes
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    10. whitequark‏ @whitequark May 1

      I still can't believe that I got the power, digital, *and* mechanical all right on the first try*. all the connectors fit! the case actually assembles! I didn't forget any clearance anywhere! * the USB connector is off by like 1mm and the crystal got rotated but it's minor

      4 replies 1 retweet 30 likes
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      Rich Felker‏ @RichFelker May 1
      Replying to @whitequark

      Congratulations!

      3:55 PM - 1 May 2018
      1 reply 0 retweets 0 likes
        1. whitequark‏ @whitequark May 1
          Replying to @RichFelker

          thanks!

          0 replies 0 retweets 0 likes
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