Feature: Phase offset on signal generator

[jessea3]

Perhaps this is available, but in the brief time I've had my board I haven't been able to find it.

I'd like to be able to define the phase relationship between the two signal generator channels. I know that this is somewhat meaningless if they are at different frequencies (at least over time), but it would be helpful to me for some of the demonstrations I do to, in effect, generate a 1K sine wave on ch1 and a 1K cosine wave on ch2.

I can more or less do this by trial and error, but it is frustrating.

[EspoTek]

This should be feasible to implement pretty easily.
Both channels would need to sync on SOF, and the timer counter that exists for the clock calibration could have an interrupt shoved on it for sub-millisecond precision.

I'll look into it in one of the coming dev days.