Disallow set_split_vfo when ptt is active

https://github.com/Hamlib/Hamlib/issues/844

src/rig.c

@@ -2670,6 +2670,7 @@ pbwidth_t HAMLIB_API rig_passband_wide(RIG *rig, rmode_t mode)
     RETURNFUNC(0);
 }
 
+//#define BUILTINFUNC 1
 
 /**
  * \brief set the current VFO
@@ -4238,14 +4239,18 @@ int HAMLIB_API rig_set_split_mode(RIG *rig,
         tx_vfo = vfo;
     }
 
-    if (caps->set_mode && (caps->targetable_vfo & RIG_TARGETABLE_MODE))
+    // if mode is not targetable than we don't need to set VFOB mode
+    int modefixed = !(caps->targetable_vfo & RIG_TARGETABLE_MODE);
+    if (modefixed) vfo = RIG_VFO_A;
+    if ((caps->set_mode && (caps->targetable_vfo & RIG_TARGETABLE_MODE)))
     {
-        TRACE;
+        rig_debug(RIG_DEBUG_VERBOSE, "%s: mode targetable\n", __func__);
         retcode = caps->set_mode(rig, tx_vfo, tx_mode, tx_width);
         RETURNFUNC(retcode);
     }
 
 
+    rig_debug(RIG_DEBUG_VERBOSE, "%s: mode not targetable\n", __func__);
     if (caps->set_vfo)
     {
         TRACE;
@@ -4652,6 +4657,12 @@ int HAMLIB_API rig_set_split_vfo(RIG *rig,
         RETURNFUNC(-RIG_ENAVAIL);
     }
 
+    if (rig->state.cache.ptt)
+    {
+        rig_debug(RIG_DEBUG_WARN, "%s: cannot execute when PTT is on\n", __func__);
+        return RIG_OK;
+    }
+
     // We fix up vfos for non-satmode rigs only
     if (rig->caps->has_get_func & RIG_FUNC_SATMODE)
     {