So you want to change phase offset for each chirp instead of the phase offset during a chirp? That should be a lot easier. I would suggest clearing the phase accumulator before each chirp that way the only difference at the start of each chirp is the programmed phase offset. If you can then capture a chirp with a phase offset of 0, and another at a phase offset of...whatever, you should be able to compare the two captures against each other to see the difference in phase offset.
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