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ttlappalainen / NMEA2000

NMEA2000 library for Arduino
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N2K connection with ISO1050 and separate power supply, no power CAN-side #429

Open terolindberg opened 1 month ago

terolindberg commented 1 month ago

Hi,

First, amazing job with the lib, thank you!

Maybe an issue or my lack of grasping the handling properly. I have an esp32 with ISO1050 connected to NMEA2000, the esp is powered separately from the bus and is "always-on". If I have the esp powered up and then power the CAN bus, the NMEA messages won't appear in the bus. If I then restart the esp while the bus is powered up, the messages start flowing fine from the ESP to the other devices. Esp at the moment only transmitting, not listening to bus. I suspected this has something to do with ISO1050 "Undervoltage Lockout and Fail-Safe" but it should clear quickly after power is on on the bus. Is this something to do with the library, or is there some trick I'd need to do with ISO1050 or the lib?

Thanks for the advice in advance!

ttlappalainen commented 1 month ago

If you Esp32 is powered and can not communicate to the bus, it may go to error state. I do not know logic. I have seen that problem with some Esp32 chips and made automatic bus reset to the library. But since most Esp32 I have used does not have any problem, I have not published the code.

virtuvas commented 1 month ago

Timo,

I've come across that a few times and I'm about to program a LilyGO T display with an embedded esp32 chipset as a tiny touchscreen controller for some N2K functions. Wouldn't mind having a look at that code if you don't mind!

cheers

V.

ttlappalainen commented 1 month ago

Do you mean my autoreset functionality?

virtuvas commented 1 month ago

Do you mean my autoreset functionality?

yes, not in a hurry though, need to get into winter programming mode first!

V.

terolindberg commented 1 month ago

If you Esp32 is powered and can not communicate to the bus, it may go to error state. I do not know logic. I have seen that problem with some Esp32 chips and made automatic bus reset to the library. But since most Esp32 I have used does not have any problem, I have not published the code.

ok, this would kinda make sense, thanks! Any recollection of which esp chips have had the issue, or worked ok for that matter? The one that I have going here is wroom32.

ttlappalainen commented 1 month ago

No idea. I have several devices and the one failing has same information than one other, which does not fail.