Add AGC level get/set to Barrett 4050

https://github.com/Hamlib/Hamlib/issues/1384

rigs/barrett/4050.c

@@ -32,21 +32,12 @@
 
 #define BARRETT4050_MODES (RIG_MODE_AM | RIG_MODE_CW | RIG_MODE_RTTY | RIG_MODE_SSB)
 
-#define BARRETT4050_LEVELS (RIG_LEVEL_NONE)
+#define BARRETT4050_LEVELS (RIG_LEVEL_AGC|RIG_LEVEL_STRENGTH)
 
 #define BARRETT4050_FUNCTIONS (RIG_FUNC_TUNER)
 
 extern int barret950_get_freq(RIG *rig, vfo_t vfo, freq_t freq);
 
-/*
- * barrett4050_get_level
- */
-static int barrett4050_get_level(RIG *rig, vfo_t vfo, setting_t level,
-                                 value_t *val)
-{
-    return -RIG_ENIMPL;
-}
-
 /*
  * barrett4050_get_info
  */
@@ -130,7 +121,7 @@ const struct rig_caps barrett4050_caps =
     .has_get_func =     BARRETT4050_FUNCTIONS,
     .has_set_func =     BARRETT4050_FUNCTIONS,
     .has_get_level =    BARRETT4050_LEVELS,
-    .has_set_level =    RIG_LEVEL_NONE,
+    .has_set_level =    RIG_LEVEL_AGC,
     .has_get_parm =     RIG_PARM_NONE,
     .has_set_parm =     RIG_PARM_NONE,
     .transceive =       RIG_TRN_RIG,
@@ -164,7 +155,8 @@ const struct rig_caps barrett4050_caps =
     .set_mode = barrett_set_mode,
     .get_mode = barrett_get_mode,
 
-    .get_level =    barrett4050_get_level,
+    .set_level =    barrett_set_level,
+    .get_level =    barrett_get_level,
 
     .get_info =     barrett4050_get_info,
     .set_ptt =      barrett_set_ptt,

rigs/barrett/barrett.c

@@ -642,6 +642,27 @@ int barrett_get_level(RIG *rig, vfo_t vfo, setting_t level, value_t *val)
 
         break;
 
+    case RIG_LEVEL_AGC:
+        retval = barrett_transaction(rig, "IGA", 0, &response);
+
+        if (retval < 0)
+        {
+            rig_debug(RIG_DEBUG_ERR, "%s: invalid response=%s\n", __func__,
+                      response);
+            return retval;
+        }
+
+        if (response[0] == 'H') // then AGC hang is on
+        {
+            val->i = 1;
+        }
+        else
+        {
+            val->i = 0;
+        }
+
+        break;
+
     default:
         rig_debug(RIG_DEBUG_ERR, "%s: unsupported level %s\n", __func__,
                   rig_strlevel(level));
@@ -654,6 +675,29 @@ int barrett_get_level(RIG *rig, vfo_t vfo, setting_t level, value_t *val)
     return RIG_OK;
 }
 
+int barrett_set_level(RIG *rig, vfo_t vfo, setting_t level, value_t val)
+{
+    char cmd_buf[MAXCMDLEN];
+    struct rig_state *rs = &rig->state;
+    int retval;
+
+    switch (level)
+    {
+        case RIG_LEVEL_AGC:
+            sprintf(cmd_buf,"EG%c%s", val.i==0?'N':'H' , EOM);
+            break;
+        default: return -RIG_ENIMPL;
+    }
+    rig_flush(&rs->rigport);
+    retval = write_block(&rs->rigport, (unsigned char *) cmd_buf, strlen(cmd_buf));
+
+    if (retval < 0)
+    {
+        return retval;
+    }
+    return RIG_OK;
+}
+
 
 /*
  * barrett_get_info

rigs/barrett/barrett.h

@@ -66,6 +66,9 @@ extern int barrett_set_split_vfo(RIG *rig, vfo_t rxvfo, split_t split,
 extern int barrett_get_split_vfo(RIG *rig, vfo_t rxvfo, split_t *split,
                                  vfo_t *txvfo);
 
+extern int barrett_get_level(RIG *rig, vfo_t vfo, setting_t level, value_t *val);
+extern int barrett_set_level(RIG *rig, vfo_t vfo, setting_t level, value_t val);
+