Duet 2 Ethernet and SBC

@smoki3 seems I've missplaced or run out of pogo pins, and with logistis being what it is I doubt I'll test it any time soon.

maybe you could try soldering a regular radial through hole capacitor to the pads and see if it helps? (or see if Tony has anything to add)

smoki3

@bearer I don't have capacitor by hand

wilriker

@smoki3 First of all I can confirm that with external PSU I see the same behavior. I need to check the cause of that next.

@wilriker said in Duet 2 Ethernet and SBC:

with external PSU

as in external 5v?

wilriker

@bearer As in external 24V going to VIN of the board.

wilriker

So what I can see is that it does not have anything to do with the internal 5V regulator. If I connect the Duet via USB to the RPi and remove the jumper for internal 5V, i.e. I_5V_EN (completely or put it on E_5V_EN - does not matter) the same problem occurs. So VIN is somehow messing with SPI as soon as it get's to fast transfers as it seems. Still checking.

Hm, will try to repeat test with 24v and get the scope out, was under the impression I had used Vin but could be organic bitrot..

smoki3

@wilriker I also tried to disable the internal 5V converter by removing the the jumper. But I also does not help

smoki3

Is the ethernet module also working over SPI?

wilriker

@smoki3 said in Duet 2 Ethernet and SBC:

Is the ethernet module also working over SPI?

Yes, it does.

smoki3

@wilriker Then its even more wired that it is working with the ethernet module and not with a raspberry

@smoki3 said in Duet 2 Ethernet and SBC:

Then its even more wired that it is working with the ethernet module and not with a raspberry

Maybe try if the wireless wifi is better? Jokes asides, I find not all boards are the same; will try to log some data and take a look at the signals.

edit: maybe one of the regulators need a minimum load that you loose when removing the ethernet - just something that hit me on the way out

wilriker

@bearer said in Duet 2 Ethernet and SBC:

edit: maybe one of the regulators need a minimum load that you loose when removing the ethernet - just something that hit me on the way out

But it also happens if the internal regulators are not even used (by removing the I_5V_EN jumper) but 5V is provided from external. As soon as 24V is put to VIN it will fail with any kind of largish transfer. Regular (small) status updates work.

@wilriker said in Duet 2 Ethernet and SBC:

But it also happens if the internal regulators are not even used

still use the 3.3v one i suspect, which is where the load from the Ethernet module would be; but it shouldn't be affected by Vin.

i've just been to collect my 8 channel thingy and hope to take a look later if I get some helping hands

update: Pi died (likely unrelated to SBC testing, as it died over night with no SBC connected) but further testing on hold pending a new Pi.

smoki3

Anyone found a solution?

Could it be a software issue?

wilriker

@smoki3 Unfortunately not yet. @bearer wanted to put a scope on it and I am still waiting for my scope to finally arrive so I can also have a look at what happens there, too.

I think software is unlikely.

Yes, I was supposed to do some digging, did some ~~bike riding~~ flying instead and in summary i now fully appreciate why planes have landing gears ..

Hope to be up and at'en in a few days unless I somehow manage to have another adventure with Mr Murphy

wilriker

I also got my scope meanwhile but it will most likely be only Monday until I can dig deeper into this problem.

JoergS5

I thought about whether it is possible to connect USB of Raspberry and Duet 2, to avoid changing Ethernet/Wifi hardware. The speed of USB 2 of 480 MBit/s should be sufficient.

@JoergS5 said in Duet 2 Ethernet and SBC:

The speed of USB 2 of 480 MBit/s should be sufficient.

but the latency and jitter is not deterministic so that might be an issue, and iirc the duet2 chip only does 11 12mbps usb