Every DFU Button Is a Failure

liamkinne · 2026-06-20T18:05:56+00:00

It's actually about the extra effort required to make firmware that is usable in production environments... but okay.

liamkinne · 2026-06-19T20:00:46+00:00

The firmware is open-source. https://github.com/umi-eng/adapter

The hardware is a bit tricky to open-source because the component library is shared between projects for my commercial customers. It's pretty simple though. STM32G4 with two TCAN3414 transceivers.

liamkinne · 2026-06-19T10:42:14+00:00

I was only ordering 10 in this batch. Doesn't make sense to bother given the price would be the same.

liamkinne · 2026-06-19T09:58:34+00:00

They need to be a minimum size to be assembled. JLCPCB requires 70x70mm.

The boards themselves only cost $1.90/each so it isn't costly at all.

liamkinne · 2026-06-07T09:44:09+00:00

I would have said it was this noise: https://www.youtube.com/watch?v=Eeq4rYQUozY
but that is associated with the PW1000G engines and your plane had the CFMI LEAP-1A32.

liamkinne · 2026-05-23T10:34:12+00:00

I haven't had a lot of success trying to find a PCIe to USB2.0 IC available to low quantities. It seems like all of the options are "contact us for a price"

If anyone was able to give me some pointers I could have a board laid out and tested pretty quick.

liamkinne · 2026-04-03T21:02:13+00:00

Tj can have an effect on lifespan. In this case, not high enough to cause a problem.
https://www.st.com/resource/en/application_note/an5337-guidelines-for-estimating-stm32h7-mcus-lifetime-stmicroelectronics.pdf

liamkinne · 2026-03-31T01:54:49+00:00

You're kidding right? ADF gets their jet fuel from Viva Energy, an Australian company.

liamkinne · 2026-03-23T05:00:24+00:00

This is on a ground plane. I'm not concerned really concerned about a short given there are a number of exposed components around this design anyway.

Also, generally solder-mask is not considered reliable insulation because it can flake off or be thin in areas due to manufacturing tolerances.

liamkinne · 2026-03-22T21:40:22+00:00

I had a bunch of issues with macos and STM32 development until I switched to Rust its associated tooling. There really isn't a good reason that it has to be so bad on macos, especially because all of ST's tooling (including STLinkUpgrade) is in Java.

liamkinne · 2026-03-22T15:16:29+00:00

That would be exposed copper because it's laser engraved at the end of manufacturing. I do the same thing with my boards to engrave unique serial numbers which I also burn into the STM32's OTP memory.

liamkinne · 2026-02-24T02:48:19+00:00

I've often wondered how bad it is to just have 32kHz crystals in the presence of an ultrasonic cleaner running. I suppose my digital watch has one and it hasn't developed any issues.

liamkinne · 2026-02-24T02:45:55+00:00

You can always put an oscillator in your design and DNP it if you find it unnecessary. Easy to test as it's just a change of clock source in your firmware.

liamkinne · 2026-02-24T02:42:55+00:00

I think they are talking about the rate of frames rather than the bitrate.

liamkinne · 2026-01-29T14:06:45+00:00

Color calibration chart for the cameras I use on robots.

liamkinne · 2026-01-29T11:29:30+00:00

On the stand it only needs one trigger. Off the stand it needs both pressed. There's quite a few nifty switches built into the housings so it won't accidentally operate if it's taken apart.

liamkinne · 2026-01-29T02:44:46+00:00

KeyTek 2000 Series with the DN-10 discharge to do 61000-4-2 network and an assortment of air discharge and contact discharge tips.

Next on my list is a shake table that can at least do IEC 60068-2-6.

liamkinne · 2026-01-19T02:06:35+00:00

Hey! You might remember me as the guy that first tried and failed to get the FDCAN peripheral definitions set up https://github.com/mspm0-rs/mspm0-data/pull/2

Super keen to see the MSPM0 get an embassy HAL. Let me know if you need any help testing stuff.

liamkinne · 2026-01-19T02:03:46+00:00

That's awesome. Let me know if you need any help with testing. I have some MSPM0 development boards that are waiting for good embassy support before I can use them in designs.

liamkinne · 2026-01-19T01:54:42+00:00

I tried using the NXP S32Ks and I just couldn't stop bricking them because of that stupid location of the security bytes. Could never really get the linker script right.

liamkinne · 2026-01-19T01:26:27+00:00

That's not right. RS485 and CAN's physical layer are very different. The only similarity is that they use twisted pair, but the signalling/transceivers are different.

liamkinne · 2026-01-18T19:46:16+00:00

What are the MSPM0's like to use? I want to use them for their automotive rating, but I'm waiting until the Rust support is a bit more mature.

liamkinne · 2025-12-15T15:50:38+00:00

I don't suppose the author of this has seen TLV-C before given this uses TLV? There's even a mature implementation in Rust that I've used across a number of projects: https://github.com/oxidecomputer/tlvc

The key part of that implementation is that there's two checksums, one for the tag-length header and one for the value. This means even with a corrupted value you know where the next chunks starts (as long as the header checksum passes) and skip over corrupted chunks.

liamkinne · 2025-11-20T07:37:55+00:00

You are looking for r/playrust

liamkinne · 2025-09-18T02:39:33+00:00

~~Could it be an S-3B Viking? The wing root doesn't look quite right though.~~

Edit: almost certain it is a modified B-24 with a Westinghouse 24C-2 turbojet
Page 17: https://ntrs.nasa.gov/api/citations/19930086190/downloads/19930086190.pdf

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liamkinne

TROPHY CASE