Fri Sep 10, 2021 3:44 pm
Are you sure about the chipset? While it may not support nanosecond timestamping of Ethernet frames for PTP (as some good Intel NICs do), most such chips do have a high-resolution timer which can be read in the interrupt handler (from GPIO or serial port control line). Still much better timing accuracy (microseconds) than cheap USB GPS devices (USB is the problem here, adds about a millisecond of latency and jitter, and few devices bother to connect PPS to one of the serial port control lines - it is much worse if they don't).