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  1. Retweeted
    Jan 12

    Sean Cross is talking about documenting hardware. “Undocumented hardware is bad”. YEAH SING IT!

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  2. 3 Dec 2019

    Informal survey: How many people have tried Foboot v2.0.3 (required for Circuitpython on Fomu)? Have you had any problems? I'm going to the factory and I'm considering whether to start shipping all new units.

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  3. Retweeted
    1 Dec 2019

    Found a sample with a defect! My own rework -_- The FOMU DVT board I got from early this year and tried to fix. Looks like I still have a short under the BGA 😨😳 I guess I'll need to go in and fix this agin at some point.

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  4. 30 Nov 2019

    I'm trying to improve the performance of circuitpython-on-Fomu, and the easiest solution is to move some stuff into RAM. The question is: Which stuff? Hacky-no-profiler soltuion: break into gdb every 10 seconds, do a backtrace, and continue. Accelerate the functions in SPI flash.

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  5. 29 Nov 2019

    Want Python in your USB port? Try the beta of for Fomu! Full USB support thanks to the new eptri USB port, and the awesome library. Binaries and instructions at

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  6. 13 Jul 2019

    The pcb is super tiny, so we use a drill to remove them from their panels. Sadlyzl, a few Fomu boards decided to go exploring as the drill bit came by. It looks like someone used the "erase" brush in real life. Happily, most came out unscathed! We'll fix this next time.

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  7. 9 Jul 2019

    Fixing the factory test jig. Today we'll start testing and programming Fomu production units!

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  8. 4 Jul 2019

    Just got done populating four light sensor boards. These will go in the factory tester to make sure the rgb led is working.

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  9. 22 Jun 2019

    Some boards got damaged in transit, but I managed to recover enough for the workshop tomorrow!

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  10. 21 Jun 2019

    I got in to Portland last night for by . I spent the week putting the finishing touches on the workshop. Come participate the workshop on Sunday and get a free Fomu EVT1 board!

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  11. 9 Jun 2019

    Of course I mean mold. That was a strange typo...

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  12. 9 Jun 2019

    The Fomu case samples just came in. Looking good! Now we need to harden the Tolland they'll be all ready for mass production.

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  13. 4 Jun 2019

    Reworking some of the original EVT1 boards now. They just need firmware, and a bodge to the crystal. Works just fine after that!

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  14. Retweeted
    28 May 2019

    Supercool... took the reworked board and put it into an X-ray machine!

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  15. 27 May 2019

    Checking the solder connections on Fomu's ICE40UP5K to make sure it has good contact and reflow. Looking good! Xray machines are magical devices.

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  16. 25 May 2019

    factory test is coming along nicely! Just need to get the LED test working and it'll be finished.

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  17. 25 May 2019

    In 24 hours, Fomu's mass production run will start. Just got my hands on the test jig. Time to make a tester!

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  18. 6 May 2019

    After a 16-hour flight, I have gdb talking to a Rust-based gdbserver. Now to hook it up to the Wishbone bridge. This'll make it even easier to debug Fomu once it's done.

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  19. 6 Jan 2019

    Spending a lot of time lately working on the board. I wrote a post discussion the rationale behind some of the decisions made around the PCB:

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  20. 26 Jun 2018

    Got debugging working on the NeTV2 softcore over Ethernet. It's now possible to attach gdb over Ethernet and inspect memory, upload programs, and trace program flow on the virtual CPU inside the FPGA!

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