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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. Mikes Electric Stuff‏ @mikelectricstuf 10 Jan 2017
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      Just found a "once in a blue-moon" glitchy bug. dipval is device ID, used by interrupt code. 400nS window of fail in a 20mS packet #dohpic.twitter.com/DzfqRazrug

      4 replies 3 retweets 11 likes
    2. Mikes Electric Stuff‏ @mikelectricstuf 10 Jan 2017
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      Replying to @mikelectricstuf

      ..and of course in the first version, the ID filtering wasn't done in the interrupt, so worked fine.

      1 reply 0 retweets 3 likes
    3. The Fallen‏ @pinski1_ 10 Jan 2017
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      Replying to @mikelectricstuf

      Could set it up so if it sees a '0' you know it's an invalid address and try again next interrupt?

      2 replies 0 retweets 0 likes
    4. Mikes Electric Stuff‏ @mikelectricstuf 10 Jan 2017
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      Replying to @pinski1_

      Once you knew to do that, you've already found the root issue & can fix properly.

      1 reply 0 retweets 0 likes
    5. The Fallen‏ @pinski1_ 10 Jan 2017
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      Replying to @mikelectricstuf

      True!

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 10 Jan 2017
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      Replying to @pinski1_ @mikelectricstuf

      It could still be the wrong ID. You can only fix this by either disabling interrupts or doing an atomic write.

      11:49 AM - 10 Jan 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Mikes Electric Stuff‏ @mikelectricstuf 10 Jan 2017
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          Replying to @marcan42 @pinski1_

          Atomic write is the correct fix - collect bits first in a temp var then copy to dipval

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 10 Jan 2017
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          Replying to @mikelectricstuf @pinski1_

          And you need to make sure dipval is volatile or the compiler might optimize the temp var out behind your back ;)

          0 replies 0 retweets 0 likes
          3. End of conversation

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