Dmitry Grinberg
@dmitrygr
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Creating order out of chaos, or reverse (as needed).
Austin, TX
Joined October 2009
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Yup. This volunteer firmware writer (me) made the fix from his laptop in the plane on the way to defcon. And was then dragged off stage during badge talk. Yup…
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Gas prices so high, gas stations are switching to scientific notation.
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V2 business card PCBs arrived. These run Linux :). Now with usb-c. Hope to bring those up later.
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Final PCBs are here. Note the complete lack of traces! :)
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Playing with the world’s tiniest camera! It is so small that the data sheet lists dimensions in µm. You can see it there in the baggie - the tiny black speck. Please forgive the poor color quality in the video. I was too lazy to implement proper de-bayering. 320x320x10bpp
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Found out that defcon banned me from the discord bot. Cold. So much for their public statement saying I am “welcome”. 🤣
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If you have more video angles of me being dragged off stage please send them to me :)
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Latest project: My business card runs Linux, and so can yours.
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Oh NBD. PalmOS 5.2.8 on an RP2040 with a $13 COTS screen.
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This device shipped with PalmOS 1.0. Thanks to rePalm-PalmCard it can run 5.2.8 now. ARM instead of 68k, IrDA, SD, audio.
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@elaifresh
@litindustrial
Uh huh…
I personally know a person at Google who got ranted at in a team meeting for taking a vacation to Hawaii. Apparently white people shouldn’t go there because that’s colonialism. After that event, my weekends were always “fine” and interests were always “sleeping”.
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@briandstone__
Posts like yours make my head hurt. 45KWh/9days averages out to a 312W draw constantly. Running a few cameras and recording to a USB stick should not use 300 fucking watts! It should fit into 3W at most.
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rePalm progress: MP3 playback using an unmodified copy of PocketTunes. This is running real-time via the ARM-to-Thumb JIT
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The first device designed to run PalmOS from the start since 2010s dropped today.... the DEFCON32 badge....
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Latest project. 4xAAA battery as power source. One year of battery life and a new algorithmically-generated image daily.
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@emilyldolson
@googledrive
I always did say that Franz Kafka never died. He is semi-retired working in google’s PM org, occasionally consulting for the UX teams as well.
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A while ago I made one of these as a present for my mom. Now I finally ported my code from ARM to xtensa to allow me to run it on inkplate10. Generates a new random image every 8h. Battery lasts a year. Inspired by the “shanshui” project, but not using its code (it was too slow)
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@elaifresh
@litindustrial
Are you kidding? Just so that person could “be offended” at you too? Everybody stayed as silent as the grave.
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Using RP2040 DMA+PIO to drive a poorly-designed but cheap display from waveshare:
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Pro tip to future “secure boot” designers. TOCTOU is not just a funny way to misspell “toucan”🦜 but also likely the sword you’ll die on if you try to get too clever. This message brought to you by a now-unsecured Cortex-M4 based mcu from a well known company.
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Hey,
@defcon
, maybe calm down with the illegal behavior a little?
Bad news: Now they flagrantly violated our NDA and posted this without asking. Classy.
Good news: it clearly shows that we delivered the final product.
Better news: We were always planning to open source, just, ya know, consensually.
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@darkswordsmantv
@0xDISREL
@defcon
For adding an Easter egg crediting the hardware company that designed the badge haddware and then had their name removed from plastics and uninvited to the badge talk. Defcon saw Easter egg and told me my attendance in the talk is also cancelled.
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@TC_Johnson
@J0hnnyXm4s
@medus4_cdc
@defcon
I am happy to answer any questions from at least what I know, stand for, did, and plan to do
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The “short” summary of how this works:
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Here is how it is connected (2x2 bga 0.4mm spacing). 10x magnification. The camera itself is hidden in one of the holes on this protoboard, where the four wires meet.
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@max_deboosted
@cchayer
@defcon
I didn’t want to resist. The security guards and I have no beef and I don’t want to hurt them or have them hurt me. They are just doing a job. Clearly they can overpower me. Why test that ?
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Latest project:
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@Cyberipman
@defcon
There are photos of it all over Twitter. It was a rainbow colored screen with the logo of the company that did all the hardware for the badge and was then uninvited from the badge talk and had their name removed from the plastics.
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@legitleavitt
@the_transit_guy
Near 100%. Usually parking is full by 1030am. Source: work at Apple.
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@d_feldman
False. Latency depends on connection establishment parameters and can be as low as 7.5ms. Source: a full-blown case of PTSD from working on Bluetooth for years.
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@lukeweston
@tdsepsilon
"NEC_RGB_SGA_FOV120_F4.0" by ams OSRAM
There is also a B&W one with the same resolution, but the one I am playing with is the color one. $84 ea:
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@medus4_cdc
@glumDumpst3rPro
@defcon
DEFCON never had any contract with me. I worked for free under the understanding that I get to be part of the badge talk. Entropic did the hardware. Obviously that needs to be paid for.
I didn’t get to talk, and I never granted defcon any license to my binary or code. DMCA :)
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And after some code refactoring and adding support for quad-channel RAM, it works!
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The update is read from SPI flash, hashed, and the signature is checked. If it all matches, the update is read again over SPI, this time for purposes of flashing to internal flash. ☠️
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@202accepted
They never shut it down or even came up to me. They just menacingly watched from afar as I stood on the public city sidewalk and signed badges.
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@ashleevance
Has anyone considered parenting? Somehow my parents managed to teach me that drugs are NEVER a good idea. One could argue that this is evolutionary pressure FOR good judgement. A rare one nowadays.
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@medus4_cdc
@glumDumpst3rPro
@defcon
I stand by what I did. You cannot remove credit from people and in-invite them (they were supposed to be at badge talk too)
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Today's cursed project: Using 8MB of PSRAM natively on
#RaspberryPi
's
#RP2040
:
It is memory mapped and accessible to all code! cool, eh?
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@yannmasoch
@twostraws
Display refresh rate is not the same thing as camera-to-display latency. Even a 1000000Hz display would make you dizzy if it took 100ms to reflect the state of the outside world
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@averyhatestwt
@legitleavitt
@the_transit_guy
Apple MAKES you come to the office. THAT induces demand, not the existence of a garage. Trust me. Nobody is there just to experience the amazing garage!
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@shuttle_dev
First of all, system programming is in C and not C++ (excepting iokit). Second of all, C has outlived plenty of “X will replace C”. It’ll outlive this one too. Most people’s masochism itch is scratched enough by bad datasheets - they don’t need a naggy compiler too.
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Come read this in a few hours :)
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The write up about using e-Ink price tags as picture frames is complete!
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The most common question I get that is not directly related to one of my projects is why my site does not have an RSS feed. Well, now it does.
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@agent_duckman
@medus4_cdc
@defcon
They never approved anything, never asked to, I don’t believe they ever tested anything. The last change I made for them was broken. I made it at a time when I couldn’t do testing and I asked them to. That change was responsible for saves not working until I pushed a fix today.
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And this is ULTRIX 4.5 booting on my actual business card, as promised. Article update coming soon.
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Hey everyone, the new dumb AI hardware eWaste just dropped.
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@ENiKS_CZ
@SergioRocks
“Limited distractions”
Tell me you have never stepped foot in an office without saying those words 🤣🤣🤣
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I don’t want to live on this planet anymore. While some of us work hard to give you faster OSs and libraries, optimizing every corner of your kernel, others of us do…this…
Node 20 allows you to compile your app into a single executable along with the entire Node.js core so you can run your apps on systems where node isn't installed, or your don't trust the system version.
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An early build of a fully flashable PalmOS 5.2.8 upgrade for the dell AximX3. rePalm supports old devices too :)
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@dieworkwear
If only there was some way a majority of people could work from some other location. If only a way existed to do video calls and remotely access machines. We could save hours of commutes and a lot of CO2. We could call it “work from home”. What a world that would be…
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@genomerambler
For those who saw this, thought it was cool, wanted to read more, and were annoyed by the lack of a link or a name:
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The sixth time you write a Flash Translation Layer, it really isn’t very hard :)
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First ever source code release for the rePalm project:
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Built a device using the $0.08 PY32F002A chip. Pretty awesome - a 48MHz Cortex-M0+ for under ten cents. 32K flash, 4K ram. All the peripherals of an STM32F1
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I am under no NDAs. Here is one of the early emails. Project is clearly described as risky and very time-constrained, with many possible things that can go wrong and cost more money. (I am on this email chain, so no NDAs are broken here)
<defcon-email-1.png>
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My eInk price tags article has been updated with more devices described and supported. More coming soon.
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Line of code of the day:
((void (*)(void))(((void*(*)(void*,uint16_t))(uintptr_t)*(uint16_t*)0x18)((void*)(uintptr_t)*(uint16_t*)0x14, 'C' * 256 + 'F')))();
This will flush the icache on the RP2040 chip ;)
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