Update TS-890S and TS-990S RIT/XIT handling

Use dedicated commands that make setting much simpler.
Replaces usage of deprecated IF command.
See issue #1380

rigs/kenwood/kenwood.c

@@ -1885,7 +1885,6 @@ int kenwood_get_vfo_if(RIG *rig, vfo_t *vfo)
     RETURNFUNC(RIG_OK);
 }
 
-
 /*
  * kenwood_set_freq
  */
@@ -2156,6 +2155,29 @@ int kenwood_get_rit(RIG *rig, vfo_t vfo, shortfreq_t *rit)
     RETURNFUNC(RIG_OK);
 }
 
+/* RF
+ * kenwood_get_rit_new (also usable as kenwood_get_xit_new)
+ *   Gets the RIT or XIT value using dedicated command
+ *   and without using IF.
+ */
+int kenwood_get_rit_new(RIG *rig, vfo_t vfo, shortfreq_t *rit)
+{
+    int retval, tempf;
+    char rfbuf[10];
+
+    ENTERFUNC;
+    if (!rit) { RETURNFUNC(-RIG_EINVAL); }
+    retval = kenwood_safe_transaction(rig, "RF", rfbuf, sizeof rfbuf, 7);
+    if (retval != RIG_OK) {RETURNFUNC(retval); }
+    tempf = atoi(rfbuf + 3);
+    if (rfbuf[2] == '1')
+    {
+        tempf = -tempf;
+    }
+    *rit = tempf;
+    RETURNFUNC(RIG_OK);
+}
+
 /*
  * rit can only move up/down by 10 Hz, so we use a loop...
  */
@@ -2252,6 +2274,30 @@ int kenwood_set_rit(RIG *rig, vfo_t vfo, shortfreq_t rit)
     RETURNFUNC2(retval);
 }
 
+/* RU/RD
+ * Set the RIT/XIT frequency offset
+ *  using dedicated commands (not IF)
+ */
+int kenwood_set_rit_new(RIG *rig, vfo_t vfo, shortfreq_t rit)
+{
+    int retval, diff;
+    shortfreq_t oldrit;
+    char rdbuf[10];
+
+    ENTERFUNC;
+    if (abs(rit) > 9999) { RETURNFUNC(-RIG_EINVAL); }
+    retval = kenwood_get_rit_new(rig, vfo, &oldrit);
+    if (retval != RIG_OK) { RETURNFUNC(retval); }
+    if (rit == oldrit)  // if the new value is the same
+    {
+        RETURNFUNC(RIG_OK); // Nothing to do
+    }
+    diff = rit - oldrit;
+    SNPRINTF(rdbuf, sizeof rdbuf, "R%c%05d;", diff < 0 ? 'D' : 'U', abs(diff));
+    retval = kenwood_transaction(rig, rdbuf, NULL, 0);
+    RETURNFUNC(retval);
+}
+
 /*
  * rit and xit are the same
  */

rigs/kenwood/kenwood.h

@@ -223,9 +223,11 @@ int kenwood_set_freq(RIG *rig, vfo_t vfo, freq_t freq);
 int kenwood_get_freq(RIG *rig, vfo_t vfo, freq_t *freq);
 int kenwood_get_freq_if(RIG *rig, vfo_t vfo, freq_t *freq);
 int kenwood_set_rit(RIG *rig, vfo_t vfo, shortfreq_t rit);
+int kenwood_set_rit_new(RIG *rig, vfo_t vfo, shortfreq_t rit);  // Also use this for xit
 int kenwood_get_rit(RIG *rig, vfo_t vfo, shortfreq_t *rit);
-int kenwood_set_xit(RIG *rig, vfo_t vfo, shortfreq_t rit);
-int kenwood_get_xit(RIG *rig, vfo_t vfo, shortfreq_t *rit);
+int kenwood_get_rit_new(RIG *rig, vfo_t vfo, shortfreq_t *rit); // Also use this for xit
+int kenwood_set_xit(RIG *rig, vfo_t vfo, shortfreq_t xit);
+int kenwood_get_xit(RIG *rig, vfo_t vfo, shortfreq_t *xit);
 int kenwood_set_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width);
 int kenwood_get_mode(RIG *rig, vfo_t vfo, rmode_t *mode, pbwidth_t *width);
 int kenwood_get_mode_if(RIG *rig, vfo_t vfo, rmode_t *mode, pbwidth_t *width);

rigs/kenwood/ts890s.c

@@ -617,10 +617,10 @@ struct rig_caps ts890s_caps =
     .rig_cleanup = kenwood_cleanup,
     .set_freq = kenwood_set_freq,
     .get_freq = kenwood_get_freq,
-    .set_rit = kenwood_set_rit,
-    .get_rit = kenwood_get_rit,
-    .set_xit = kenwood_set_xit,
-    .get_xit = kenwood_get_xit,
+    .set_rit = kenwood_set_rit_new,
+    .get_rit = kenwood_get_rit_new,
+    .set_xit = kenwood_set_rit_new,  // Same routines as for RIT
+    .get_xit = kenwood_get_rit_new,  // Same
     .set_mode = kenwood_set_mode,
     .get_mode = kenwood_get_mode,
     .set_vfo = kenwood_set_vfo,

rigs/kenwood/ts990s.c

@@ -343,10 +343,10 @@ struct rig_caps ts990s_caps =
     .rig_cleanup = kenwood_cleanup,
     .set_freq =  kenwood_set_freq,
     .get_freq =  kenwood_get_freq,
-    .set_rit =  kenwood_set_rit,
-    .get_rit =  kenwood_get_rit,
-    .set_xit =  kenwood_set_xit,
-    .get_xit =  kenwood_get_xit,
+    .set_rit =  kenwood_set_rit_new,
+    .get_rit =  kenwood_get_rit_new,
+    .set_xit =  kenwood_set_rit_new,  // Use same routines as for rit
+    .get_xit =  kenwood_get_rit_new,  // Same
     .set_mode =  kenwood_set_mode,
     .get_mode =  kenwood_get_mode,
     .set_vfo =  kenwood_set_vfo_main_sub,