PTP with QNEthernet?

[Pragmataraxia]

Internet articles abound with the news that the Teensy 4.1 "supports PTP". I have yet to discover any actual implementation of IEEE 1588 for the Teensy 4.1, so I thought I might take a swing at it. If I can crack it this weekend, my company won't over-engineer the bejesus out of a problem we're trying to solve.

QNEthernet actually seems to have functional UDP multicasting (unlike other interfaces I've tried), and the readme actually mentions PTP frames, so I thought I might start here. There are a few questions that come to mind though:

1. Am I simply too green to realize that PTP on the Teensy 4.1 is already "solved"?
2. Is QNEthernet suitable for this purpose? Since it's not asynchronous, a PTP application will need rely on the hardware for timestamping incoming packets... but I haven't the foggiest idea how to access that data.

I don't know who (besides Shawn) will see this discussion, but any tips would be grand.

[ssilverman]

I have an API implementation for accessing the IEEE1588 features such as clock adjustment and raw Ethernet frame timestamps, but I haven't released it. If you're interested in talking about it off-list, send me an email.

[achalkumar076]

hi shawn, I would like to discuss about PTP on teensy 4.1, what's your email id?

[ssilverman]

It’s in the source code headers.