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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. whitequark‏ @whitequark 13 Apr 2018
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      whitequark Retweeted whitequark

      Glasgow is a 50 MHz 1V8/2V5/3V3/3V6/5V0 bus multitool, think Bus Pirate + Bus Blaster + Logic Sniffer all in one reconfigurable package you have 16 pins. put any of {JTAG,SWD,SPI,I2C,USART,…} on any of them, or even use your own protocol core on the FPGA!https://twitter.com/whitequark/status/985037591568199686 …

      whitequark added,

      whitequark @whitequark
      it's getting together pic.twitter.com/5k1BwGQhuR
      Show this thread
      14 replies 70 retweets 260 likes
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    4. whitequark‏ @whitequark 13 Apr 2018
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      Replying to @scanlime

      not without migrating to the 0.8mm pitch 256-ball BGA, which I don't want to deal with right now because I haven't ever really designed a board of this complexity or with this amount of QFNs

      1 reply 0 retweets 1 like
    5. whitequark‏ @whitequark 13 Apr 2018
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      Replying to @whitequark @scanlime

      if you want a Glasgow I'd totally send one to you

      1 reply 0 retweets 2 likes
    6. whitequark‏ @whitequark 14 Apr 2018
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      Replying to @whitequark @scanlime

      ... you gave me an idea I think I can use that one spare pin I don't know what to use for to let you synchronize two Glasgow boards and capture twice as much data

      3 replies 1 retweet 21 likes
    7. Boltzmann Brain Think Tank‏ @PLT_cheater 14 Apr 2018
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      Replying to @whitequark @scanlime

      Could this be chained?

      0 replies 0 retweets 0 likes
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    9. whitequark‏ @whitequark 15 Apr 2018
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      Replying to @scanlime @PLT_cheater

      that is exactly what I want to do, yes

      1 reply 0 retweets 3 likes
      Hector Martin‏ @marcan42 15 Apr 2018
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      Replying to @whitequark @scanlime @PLT_cheater

      That should be interesting. Can you actually fine trim the frequency finely enough for that to work? (without just resampling the output data host side). I thought you were actually going to send a ref clock, which would be more robust.

      6:44 AM - 15 Apr 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. whitequark‏ @whitequark 15 Apr 2018
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          Replying to @marcan42 @scanlime @PLT_cheater

          good question. I wouldn't know until I try--and that's why sending a reference clock is a fallback. I like synchronization because it's much simpler, all boards have the same role, as opposed to leader/follower with clock distribution

          1 reply 0 retweets 0 likes
        3. whitequark‏ @whitequark 15 Apr 2018
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          Replying to @whitequark @marcan42 and

          the SYNC pin is open-drain only (I ran out of push-pull pins), but the driver is pretty strong, so distributing a 10 MHz clock (fmin of the PLL) is a fallback option in case what I want doesn't work out

          1 reply 0 retweets 1 like
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