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oe1cxw's profile
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩
@oe1cxw

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Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩

@oe1cxw

Neurodiverse trans geek girl. Yosys, RISC-V, SAT/SMT.

She/her/hers
clairexen.net
Joined September 2014

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    1. Olof Kindgren‏ @OlofKindgren 29 Nov 2016
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      Which SPI clock phase type are you?

      3 replies 1 retweet 1 like
    2. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 29 Nov 2016
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      Replying to @OlofKindgren

      CPOL=1 CPHA=1

      1 reply 0 retweets 0 likes
    3. Olof Kindgren‏ @OlofKindgren 29 Nov 2016
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      Replying to @oe1cxw

      Wanted to add CPOL as well, but the polls only allow 4 options (and I agree even if I would prefer it not to be configurable at all)

      1 reply 0 retweets 0 likes
    4. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 29 Nov 2016
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      Replying to @OlofKindgren

      if it wouldn't be configurable you'd still find slave devices of all 4 kinds. We'd just call only one SPI and we had 1/

      1 reply 0 retweets 0 likes
    5. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 29 Nov 2016
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      Replying to @oe1cxw @OlofKindgren

      three other names for the rest. And then we'd have yet another name for controllers that support all 4 types. 2/2

      1 reply 0 retweets 0 likes
    6. Olof Kindgren‏ @OlofKindgren 29 Nov 2016
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      Replying to @oe1cxw

      Sure, we have to support all options now. Just wish this was defined from the start, like in other protocols, to avoid the madness

      1 reply 0 retweets 0 likes
    7. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 29 Nov 2016
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      Replying to @OlofKindgren

      afiak it started with slave devices using any of the four modes before it was even called SPI. Just the four sane ways of 1/

      1 reply 0 retweets 0 likes
    8. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 29 Nov 2016
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      Replying to @oe1cxw @OlofKindgren

      hooking up a shift register to a serial interface. None better than the others. Then Motorola made a host controller that 2/

      1 reply 0 retweets 0 likes
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 29 Nov 2016
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      Replying to @oe1cxw @OlofKindgren

      could talk to all those existing devices and called the whole thing SPI. Other than I2C there is no "SPI standard". 3/

      1:05 PM - 29 Nov 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 29 Nov 2016
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          Replying to @oe1cxw @OlofKindgren

          The whole CPOL and CPHA nomenclature just comes from the way that fairly universal controller used to be configured. 4/4

          1 reply 0 retweets 0 likes
        2. Olof Kindgren‏ @OlofKindgren 29 Nov 2016
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          Replying to @oe1cxw

          A 5th (and 6th for CPOL=0/1) option would also be to do DDR instead. Doesn't matter though as everyone is migrating to PonyLink :)

          1 reply 1 retweet 1 like
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