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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 20 Mar 2020
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      I was just now made aware that Propeller 2 is apparently a thing and, just, wow. This chip is *insane*. It's got a CORDIC solver. It's got DVI. It's got up to 32 USB ports, or 64 UARTs, 64 anything because why have pin muxing when EVERY PIN DOES EVERYTHING.pic.twitter.com/FlFt64gt36

      6 replies 60 retweets 256 likes
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    2. Hector Martin‏ @marcan42 20 Mar 2020
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      Docs: https://docs.google.com/document/d/1gn6oaT5Ib7CytvlZHacmrSbVBJsD9t_-kmvjd7nUR6o/edit# … Apparently current sample silicon runs at up to 390MHz, because that's where the PLL craps out before the logic does. Oh yeah and the Verilog is open source.

      1 reply 2 retweets 28 likes
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    3. Hector Martin‏ @marcan42 20 Mar 2020
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      "but it can also be used as a general-purpose RF modulator"pic.twitter.com/zyWz2yQGrV

      1 reply 2 retweets 16 likes
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    4. Hector Martin‏ @marcan42 20 Mar 2020
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      "This mode calculates an 8-bit ADC sample and checks for hysteretic triggering on every clock, providing the basis of oscilloscope functionality."pic.twitter.com/dgZY45UGUL

      1 reply 0 retweets 16 likes
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    5. Hector Martin‏ @marcan42 20 Mar 2020
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      People did fake single-ended USB on Propeller 1? Yeah, this one does it properly. At the bit level, of course.pic.twitter.com/AOtMaif7sa

      1 reply 1 retweet 13 likes
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    6. Hector Martin‏ @marcan42 20 Mar 2020
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      You thought that Thumb-2 IT instruction stuff was cute? Try this version. It even handles subroutines atomically.pic.twitter.com/rEt4NSjBEp

      1 reply 1 retweet 10 likes
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    7. Hector Martin‏ @marcan42 20 Mar 2020
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      Look, you need to learn to stop calling this a "pixel mixer" and start calling it 4x8b SIMD.pic.twitter.com/eE4rc5e3dR

      1 reply 1 retweet 16 likes
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    8. Hector Martin‏ @marcan42 20 Mar 2020
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      Like I/O DMA, but with crazy modes. Goer-what?pic.twitter.com/bMGgwVxIbV

      2 replies 1 retweet 10 likes
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    9. Hector Martin‏ @marcan42 20 Mar 2020
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      Native DVI/HDMI. Yes, really. Don't worry, it does NTSC/PAL modulation too, you retro folks.pic.twitter.com/vOl4ORSzXQ

      1 reply 2 retweets 21 likes
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      Hector Martin‏ @marcan42 20 Mar 2020
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      These are the things that EVERY SINGLE PIN CAN DO. "PWM switch-mode power supply with voltage and current feedback"pic.twitter.com/Oy962jVDdm

      11:26 AM - 20 Mar 2020
      • 2 Retweets
      • 23 Likes
      • whitequark hell writes memory initialization code for fun Farewell_ / Kit Ahmad NullMind Ryan Hamel 2ftg sam Cyrs the unsinkable sea serpent
      4 replies 2 retweets 23 likes
        1. New conversation
        1. Hector Martin‏ @marcan42 20 Mar 2020
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          It has Forth in the boot ROM. https://docs.google.com/document/d/e/2PACX-1vQKKl_A9gQ8VooCfrLOqw6a_rp9ddyAqiFeo1RopL2AtnHTaWIfvojYq-yfNlqoPD81a2EU1EJsQpRG/pub …

          2 replies 1 retweet 26 likes
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        2. Hector Martin‏ @marcan42 20 Mar 2020
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          Correction: I don't think the Verilog is open source (though they have bitstreams up for running it on some FPGA boards, misnomered as "verilog"). The Propeller 1 verilog is GPL'ed; I'm not sure if they plan on opening Propeller 2, but I'm guessing they eventually will?

          1 reply 0 retweets 16 likes
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          3. End of conversation
        1. sww1235‏ @sww1235 20 Mar 2020
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          Replying to @marcan42

          Holy shit

          0 replies 0 retweets 0 likes
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        1. Ivan Miranda‏ @adnarimnavi 20 Mar 2020
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          Replying to @marcan42

          Damn...

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