Fix ANT get/set for IC756Pro series

https://github.com/Hamlib/Hamlib/issues/774

rigs/icom/ic756.c

@@ -127,7 +127,7 @@ static const struct icom_priv_caps ic756_priv_caps =
     0,       /* 731 mode */
     0,       /* no XCHG */
     ic756_ts_sc_list,
-    .antack_len = 2,
+    .antack_len = 3,
     .ant_count = 2,
     .r2i_mode = r2i_mode,
     .agc_levels_present = 1,
@@ -291,7 +291,7 @@ static const struct icom_priv_caps ic756pro_priv_caps =
     0,        /* 731 mode */
     0,    /* no XCHG */
     ic756pro_ts_sc_list,
-    .antack_len = 2,
+    .antack_len = 3,
     .ant_count = 2,
     .agc_levels_present = 1,
     .agc_levels = {
@@ -461,7 +461,7 @@ static const struct icom_priv_caps ic756pro2_priv_caps =
     0,       /* 731 mode */
     0,       /* no XCHG */
     ic756pro_ts_sc_list,
-    .antack_len = 2,
+    .antack_len = 3,
     .ant_count = 2,
     .agc_levels_present = 1,
     .agc_levels = {
@@ -890,7 +890,7 @@ static const struct icom_priv_caps ic756pro3_priv_caps =
     0,       /* 731 mode */
     0,       /* no XCHG */
     ic756pro_ts_sc_list,
-    .antack_len = 2,
+    .antack_len = 3,
     .ant_count = 2,
     .agc_levels_present = 1,
     .agc_levels = {
@@ -976,7 +976,7 @@ const struct rig_caps ic756pro3_caps =
     RIG_MODEL(RIG_MODEL_IC756PROIII),
     .model_name = "IC-756PROIII",
     .mfg_name =  "Icom",
-    .version =  BACKEND_VER ".0",
+    .version =  BACKEND_VER ".1",
     .copyright =  "LGPL",
     .status =  RIG_STATUS_STABLE,
     .rig_type =  RIG_TYPE_TRANSCEIVER,

rigs/icom/icom.c

@@ -7601,7 +7601,6 @@ int icom_set_ant(RIG *rig, vfo_t vfo, ant_t ant, value_t option)
             RETURNFUNC(retval);
         }
 
-        antopt_len = 0;
         rig_debug(RIG_DEBUG_TRACE,
                   "%s: antack_len=%d so antopt_len=%d, antopt=0x%02x\n",
                   __func__, priv_caps->antack_len, antopt_len, antopt[0]);
@@ -7729,13 +7728,14 @@ int icom_get_ant(RIG *rig, vfo_t vfo, ant_t ant, value_t *option,
     rig_debug(RIG_DEBUG_ERR, "%s: ackbuf= 0x%02x 0x%02x 0x%02x\n", __func__,
               ackbuf[0], ackbuf[1], ackbuf[2]);
 
-    *ant_curr = rig_idx2setting(ackbuf[1]);
+    *ant_curr = *ant_tx = *ant_rx = rig_idx2setting(ackbuf[1]);
 
     // Note: with IC756/IC-756Pro/IC-7800 and more, ackbuf[2] deals with [RX ANT]
     // Hopefully any ack_len=3 can fit in the option field
     if (ack_len == 3)
     {
         option->i = ackbuf[2];
+        *ant_rx = rig_idx2setting(ackbuf[2]);
     }
 
     RETURNFUNC(RIG_OK);

rigs/icom/icom.h

@@ -30,7 +30,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "20210812"
+#define BACKEND_VER "20210822"
 
 #define ICOM_IS_SECONDARY_VFO(vfo) ((vfo) & (RIG_VFO_B | RIG_VFO_SUB | RIG_VFO_SUB_B | RIG_VFO_MAIN_B))
 #define ICOM_GET_VFO_NUMBER(vfo) (ICOM_IS_SECONDARY_VFO(vfo) ? 0x01 : 0x00)

tests/simicom.c

@@ -27,6 +27,8 @@ mode_t modeA = RIG_MODE_CW;
 mode_t modeB = RIG_MODE_USB;
 pbwidth_t widthA = 0;
 pbwidth_t widthB = 1;
+ant_t ant_curr = 0;
+int ant_option = 0;
 
 void dumphex(unsigned char *buf, int n)
 {
@@ -159,6 +161,25 @@ void frameParse(int fd, unsigned char *frame, int len)
         write(fd, frame, 6);
         break;
 
+    case 0x12: // we're simulating the 3-byte version -- not the 2-byte
+        if (frame[5] != 0xfd)
+        {
+            printf("Set ant %d\n", -1);
+            ant_curr = frame[5];
+            ant_option = frame[6];
+            dump_hex(frame,8);
+        }
+        else {
+            printf("Get ant\n");
+        }
+        frame[5] = ant_curr;
+        frame[6] = ant_option;
+        frame[7]=0xfd;
+        printf("write 8 bytes\n");
+        dump_hex(frame,8);
+        write(fd, frame, 8);
+        break;
+
     case 0x1a: // miscellaneous things 
         switch (frame[5])
         {
@@ -173,7 +194,7 @@ void frameParse(int fd, unsigned char *frame, int len)
 
         break;
 
-#if 0
+#if 1
     case 0x25:
         if (frame[6] == 0xfd)
         {