When vfo twiddling is being done set_freq calls will be skipped

https://github.com/Hamlib/Hamlib/issues/664

include/hamlib/rig.h

@@ -2090,6 +2090,11 @@ typedef enum {
     HAMLIB_CACHE_WIDTH
 } hamlib_cache_t;
 
+typedef enum {
+    TWIDDLE_OFF,
+    TWIDDLE_ON
+} twiddle_state_t;
+
 /**
  * \brief Rig cache data
  * 
@@ -2254,6 +2259,7 @@ struct rig_state {
     int power_max;              /*!< Maximum RF power level in rig units */
     unsigned char disable_yaesu_bandselect; /*!< Disables Yaeus band select logic */
     int twiddle_rit;            /*!< Suppresses VFOB reading (cached value used) so RIT control can be used */
+    int twiddle_state;          /*!< keeps track of twiddle status */
 };
 
 //! @cond Doxygen_Suppress

rigs/dummy/dummy.c

@@ -844,6 +844,7 @@ static int dummy_set_split_freq(RIG *rig, vfo_t vfo, freq_t tx_freq)
 
     ENTERFUNC;
     priv->curr->tx_freq = tx_freq;
+    rig_debug(RIG_DEBUG_VERBOSE, "%s: priv->curr->tx_freq = %.0f\n", __func__, priv->curr->tx_freq);
 
     RETURNFUNC(RIG_OK);
 }
@@ -856,6 +857,7 @@ static int dummy_get_split_freq(RIG *rig, vfo_t vfo, freq_t *tx_freq)
     ENTERFUNC;
 
     *tx_freq = priv->curr->tx_freq;
+    rig_debug(RIG_DEBUG_VERBOSE, "%s: priv->curr->tx_freq = %.0f\n", __func__, priv->curr->tx_freq);
 
     RETURNFUNC(RIG_OK);
 }

src/rig.c

@@ -1661,8 +1661,9 @@ int twiddling(RIG *rig)
 
         if (elapsed < rig->state.twiddle_timeout)
         {
-            rig_debug(RIG_DEBUG_TRACE, "%s: Twiddle elapsed < 3, elapsed=%d\n", __func__,
-                      elapsed);
+            rig_debug(RIG_DEBUG_TRACE, "%s: Twiddle elapsed < %d, elapsed=%d\n", __func__,
+                      rig->state.twiddle_timeout, elapsed);
+            rig->state.twiddle_state = TWIDDLE_ON; // gets turned off in rig_set_freq;
             RETURNFUNC(1); // would be better as error but other software won't handle it
         }
     }
@@ -1698,6 +1699,13 @@ int HAMLIB_API rig_set_freq(RIG *rig, vfo_t vfo, freq_t freq)
         RETURNFUNC(-RIG_EIO);
     }
 
+    if (rig->state.twiddle_state == TWIDDLE_ON)
+    {
+        // we keep skipping set_freq while the vfo knob is in motion
+        rig_debug(RIG_DEBUG_VERBOSE, "%s: Twiddle on so skipping this set_freq request one time\n", __func__);
+        rig->state.twiddle_state = TWIDDLE_OFF;
+    }
+
     caps = rig->caps;
 
     vfo = vfo_fixup(rig, vfo);