Using LimeSDR-Mini for TDOA

I am looking into doing Time Difference of Arrival with my LimeSDR Mini using the two dipole switching method of making artificial doppler.

I am trying to figure out how to make the LimeSDR generate my switching signal from the FPGA so I know exactly in my I/Q samples which antenna was in use at the time.

There is a Lime Suite FPGA GPIO example:

But I’m guessing you actually mean driven direct via the FPGA and in which case I suspect this will mean modifying the gateware. E.g. so that every N samples a GPIO is automatically toggled.