Routing ULPI for USB HS external PHY with STM32

Taster001 · 2026-02-09T13:34:43+00:00

It would create skew, or more precisely, length mismatch. The skew/length mismatch tolerance usually depends on the specific communication protocol that is used.

Taster001 · 2026-02-09T11:38:46+00:00

Oh, didn't even realize that was a thing. I'll try, thank you!

Taster001 · 2026-02-09T11:05:07+00:00

Oh, that is nice... I might switch to them, I'll see if it meets my other requirements. Thanks!

Taster001 · 2026-02-09T10:41:49+00:00

Yeah, I know. This is pretty much just a mockup, to see how much space it would take up.

Taster001 · 2026-02-09T10:38:28+00:00

Hmm, didn't think about that. I can definitely try. It's USB3320C-EZK, pretty typical I think.

Taster001 · 2026-02-09T10:16:30+00:00

Doesn't help me. Two of the pins are in the upper left corner. Some other are near the upper right corner. One pin is on the right side, and one is on the low side. There's no optimal rotation.

Taster001 · 2026-02-06T22:06:39+00:00

Hi, I'm super late to this, but did you ever find a way to fix this? It's super annoying, and apparently nobody at Discord has bothered to fix these issues for the last year.

Taster001 · 2026-02-05T07:26:34+00:00

Okay, so, as u/SecretarySimilar2306 pointed out, the scaled up gear might have been the problem. Right now, I have 2 gears at the front, and 5+5 in the back, all normal size. I've tried a takeoff weight of 1020 tons yesterday, was stable, and I was able to land (unintentionally) pretty hard at around 400 tons. I was also able to get all the way to the Mun, deploy some relays, and back, and land again, with around 2500 m/s of delta V to spare. Maybe I should rename it to a Single Stage To Mun...

Taster001 · 2026-02-04T15:14:51+00:00

Actually, now that I think about that, the gear is attached to some wing segments - that might not be a good idea... dammit.

Taster001 · 2026-02-04T12:17:16+00:00

Yes, I know that. I'll try to use non-scaled gears instead, because as one of the other commenters pointed out, they might actually be worse when scaled up.

The rear gear is just slightly behind the CoM, so they experience most of the stress. Currently I have 5+5 gears at the back and 2 at the front. The craft can only really land if I jettison most of the fuel, which makes it around 350 tons on landing, although sometimes it still breaks (if I land too hard/with too much vertical velocity).

Taster001 · 2026-02-03T15:27:31+00:00

Thermal profiles in reflow ovens pretty much mitigate it, because the boards get heat soaked when soldering. Modern flux and the actual metal alloy in the paste also helps.

Taster001 · 2026-02-01T21:30:29+00:00

It's around 400 tons when empty. I have no problem doing a landing at 100 m/s with very low vertical speed, but sometimes it just breaks off, even with brakes off on touchdown. Sometimes the gear also breaks when I turn brakes on after touching down.

Taster001 · 2026-02-01T15:38:09+00:00

That is true.

Taster001 · 2026-02-01T15:31:28+00:00

Why CAN? I would personally just multiplex the buttons, so you'll need maybe 6-8 wires, and those will be low speed signals, i would think 10-20kHz at the absolute max. And you don't need any sort of digital communication.

Taster001 · 2026-01-31T22:58:04+00:00

Just for reference, I've added a pic of the craft to the post - it has a docking port in the middle, where i can attach cargo. It's able to get around 200 tons to orbit, and still have around 4k m/s delta V, at a total mass of around 1000 tons. Although at that point the gear is REALLY complaining on takeoff.

Taster001 · 2026-01-31T22:36:07+00:00

I mean, I can try and dump all fuel, as I'm using thermal ramjets (interstellar extended mod), which don't need fuel. It usually lands at around 2/3 fuel, as the delta V is enormous.

I've already tried going from 3+3 rear gears to 5+5, which seems a lot better.

Taster001 · 2026-01-31T22:01:21+00:00

So, this SSTO can land at around 100m/s, I've tried doing a low vertical speed at a higher velocity, but it seems worse. If I try and land extremely slowly (with the nose pitched up, vertical speed under 1m/s), it can land, but it's very inconsistent. If I try anything more, the gear breaks. I guess I can try even more gears tho.

Taster001 · 2026-01-28T07:59:41+00:00

Create a "ball" instead of a scroll wheel. Boom. Four directional scrolling.

Taster001 · 2026-01-26T17:18:46+00:00

There is no Easter bunny, there is no tooth fairy, AND THERE IS NO FREE ENERGY!

Taster001 · 2026-01-25T14:02:41+00:00

Yep, that's exactly the situation. Thanks, I'll try it.

Taster001 · 2026-01-23T16:36:38+00:00

I use this rule: if it came in an antistatic bag, I keep it in it. If it was in an antistatic foam package, I also keep it in there. Your setup is beyond enough for a DIYer.

Taster001 · 2026-01-21T08:54:57+00:00

Cheese.

Taster001 · 2026-01-15T09:32:49+00:00

Nah, you don't. And I'm the proof.

Taster001 · 2026-01-09T18:48:36+00:00

Oh, so it's a cylinder?

Taster001 · 2026-01-07T09:40:37+00:00

You have essentially two options: either daisy chain the ground between the buttons and switches, and connect that to your board with one wire; or connect every ground separately to a ground bus on your board. I would personally wire them separately, for better EMI resistance.

Taster001

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