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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. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 1 Jan 2017
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      Replying to @folknology @wavedrom

      J1a is pretty much as tight as it gets (hx1k). Still 33% space savings. ("gzip -9" achieves 42% space savings.)pic.twitter.com/7rTHUssgT7

      2 replies 0 retweets 3 likes
    2. Aliaksei Chapyzhenka‏ @wavedrom 1 Jan 2017
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      Replying to @oe1cxw @folknology

      Agree, 33% is a good start. Could you elaborate more on the algorithm your are using?

      1 reply 0 retweets 1 like
    3. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 1 Jan 2017
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      Replying to @wavedrom @folknology

      I am storing the distances between ones. I'm using a simple Huffman code to use fewer bits for small distances.

      4 replies 0 retweets 0 likes
    4. Aliaksei Chapyzhenka‏ @wavedrom 1 Jan 2017
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      Replying to @oe1cxw @folknology

      yes, this way you are winning allot on Zero and loosing on Ones. Here is 128'b1 example:pic.twitter.com/GxGyXZxqym

      2 replies 0 retweets 0 likes
    5. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 2 Jan 2017
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      Replying to @wavedrom @folknology

      Improved version: http://svn.clifford.at/handicraft/2016/ice40compr … worst case is now -15%.pic.twitter.com/p9SN6ny1Hi

      2 replies 0 retweets 6 likes
    6. Aliaksei Chapyzhenka‏ @wavedrom 2 Jan 2017
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      Replying to @oe1cxw @folknology

      Great! Can you compile it for bare-metal ARM? What is the code size?

      2 replies 0 retweets 0 likes
    7. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 3 Jan 2017
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      Replying to @wavedrom @folknology

      I now wrote a pure C version of the uncompressor. Less than 200 bytes code size on ARM thumb. http://svn.clifford.at/handicraft/2016/ice40compr/ice40uncompr.c …

      2 replies 0 retweets 4 likes
    8. Al‏ @folknology 3 Jan 2017
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      Replying to @oe1cxw @wavedrom

      Would you add this as commandline option to icepack (-p) or some such?

      1 reply 0 retweets 0 likes
    9. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 3 Jan 2017
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      Replying to @folknology @wavedrom

      Wouldn't it be more natural to have this functionality in the upload tool for the device with embedded decompressor?

      1 reply 0 retweets 0 likes
    10. Al‏ @folknology 3 Jan 2017
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      Replying to @oe1cxw @wavedrom

      current myStorm upload is 'cat chip.bin >/dev/ttyUSB0'

      1 reply 0 retweets 0 likes
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 3 Jan 2017
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      Replying to @folknology @wavedrom

      How would you reset the decompressor to make sure its in its init state? E.g. after interrupting an upload.

      8:00 AM - 3 Jan 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        1. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 3 Jan 2017
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          Replying to @oe1cxw @folknology @wavedrom

          I'd suggest a small tool that sends: serial break (for reset), a magic value, compressed bit-stream.

          1 reply 0 retweets 0 likes
        2. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 3 Jan 2017
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          Replying to @oe1cxw @folknology @wavedrom

          No decompression without the magic value right after reset. So you can still cat uncompressed bins to /dev/ttyUSB0.

          2 replies 0 retweets 0 likes
        3. Show replies
        1. Al‏ @folknology 3 Jan 2017
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          Replying to @oe1cxw @wavedrom

          right now we simply wait for the preamble '(preamble != 0x7EAA997E)'

          0 replies 0 retweets 0 likes
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