Udo van den Heuvel via devel writes: > What else could we do with the timemark functionality? > See what is suggested at > https://lists.ntpsec.org/pipermail/devel/2018-August/006447.html ?
Well, actually this suggestion was highly rasPi specific: The hardware PWM is clocked directly off the crystal, so by programming it to deliver one pulse per second and controlling the start of that pulse by the PPS you get both: start of pulse timemark gets you the interrupt delay+jitter, and the trailing edge gets you a measure of how far off the XTAL is from nominal. As a bonus, you can modulate the pulse width to identify which timemark corresponds to which PPS echo and that modulation can be used to dither the quantization error on the XTAL frequency. Regards, Achim. -- +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ Factory and User Sound Singles for Waldorf Blofeld: http://Synth.Stromeko.net/Downloads.html#WaldorfSounds _______________________________________________ devel mailing list devel@ntpsec.org http://lists.ntpsec.org/mailman/listinfo/devel
