Method advance

app/src/DSP.h:658–692

* @brief Steps the trigger state with one trigger-source sample; returns the * sweep time to append at, or a negative sentinel to skip this sample. */

   *        sweep time to append at, or a negative sentinel to skip this sample.
   */
  double advance(double now, double trigValue)
  {
    double sweepTime = -1.0;

    if (sweeping) {
      const double st = now - t0;
      if (st > activeWindow())
        completeSweep();
      else {
        sweepTime = st < 0 ? 0.0 : st;
        prevValue = trigValue;
        prevTime  = now;
        prevValid = true;
        return sweepTime;
      }
    }

    if (!sweeping && shouldStart(now, trigValue)) {
      t0           = triggerOrigin(now, trigValue);
      lastSweepSec = now;
      if (edgeDetected(trigValue))
        lastTriggerSec = now;

      for (auto& r : back)
        r.clear();

      sweeping  = true;
      sweepTime = (now - t0) < 0 ? 0.0 : (now - t0);
    }

    prevValue = trigValue;
    prevTime  = now;
    prevValid = true;
    return sweepTime;
  }

private:
  /**