Beware of that 1PPS signal. A few years ago I bought several GPS modules and compared the signals. Some differ by exactly 100ns (within 2ns, the accuracy of my scope) from others, and that is not the width of the pulse, that is much wider, I compared only the edge that are comes close to the others. Maybe I will test again, have a 1 GHz LeCroy now, should be able to do jitter measurements too. Oh, and yes, before someone asks: all antenna and scope cables were the same length... ;-)
Arie On 2022-12-08 06:33, James Dougherty wrote:
Related to this, I have a GPS receiver generating PPS interrupts on SAME70. It would be a perfect GMC - Atomic clock sync! I will look at this when I get a chance. I have a lot of upstream contributions from HW platforms I have done over the last 5 years or so with myself and others ... I need some time to patch master on upstream -- something for 2023 and now that NuttX has graduated! Yay!
