Auto center mode added

nanovna.h

@@ -898,6 +898,7 @@ typedef struct uistat {
   uint8_t marker_delta;
   uint8_t marker_noise;
   uint8_t marker_tracking;
+  uint8_t auto_center_marker;
   char text[20];
 } uistat_t;
 

sa_core.c

@@ -2281,7 +2281,7 @@ sweep_again:                                // stay in sweep loop when output mo
         if (actual_max_level < - 40)
           signal_is_AM = false;
       } else {
-        if (AGC_flip_count > 20 && actual_max_level >= - 40)
+        if (AGC_flip_count > 20 && actual_max_level >= - 40 && S_IS_AUTO(setting.agc))
           signal_is_AM = true;
       }
       if (signal_is_AM) {      // if log mode and AM signal

ui.c

@@ -32,6 +32,7 @@ uistat_t uistat = {
  marker_delta: FALSE,
  marker_noise: FALSE,
  marker_tracking : FALSE,
+ auto_center_marker : FALSE,
  text : "",
 };
 
@@ -767,6 +768,10 @@ static UI_FUNCTION_CALLBACK(menu_marker_op_cb)
   case 1: /* MARKER->STOP */
   case 2: /* MARKER->CENTER */
     set_sweep_frequency(data, freq);
+    if (data == 2) {
+      uistat.lever_mode = LM_SPAN;
+      uistat.auto_center_marker = true;
+    }
     break;
   case 3: /* MARKERS->SPAN */
     {
@@ -1275,6 +1280,7 @@ menu_invoke(int item)
     break;
 
   case MT_CALLBACK: {
+    uistat.auto_center_marker = false;
     menuaction_cb_t cb = (menuaction_cb_t)menu->reference;
     if (cb) (*cb)(item, menu->data);
 //    if (!(menu->type & MT_FORM))
@@ -1282,6 +1288,7 @@ menu_invoke(int item)
     break;
   }
   case MT_ADV_CALLBACK: {
+    uistat.auto_center_marker = false;
     menuaction_acb_t cb = (menuaction_acb_t)menu->reference;
     if (cb) (*cb)(item, menu->data, NULL);
 //    if (!(menu->type & MT_FORM))
@@ -1293,6 +1300,7 @@ menu_invoke(int item)
     break;
 
   case MT_KEYPAD:
+    uistat.auto_center_marker = false;
     if (menu->type & MT_FORM) {
       area_width = AREA_WIDTH_NORMAL - MENU_BUTTON_WIDTH;
       redraw_frame();         // Remove form numbers
@@ -2136,6 +2144,11 @@ static void
 lever_zoom_span(int status)
 {
   uint32_t span = get_sweep_frequency(ST_SPAN);
+  if (uistat.auto_center_marker) {
+    uint32_t freq = get_marker_frequency(active_marker);
+    if (freq != 0)
+      set_sweep_frequency(ST_CENTER, freq);
+  }
   if (status & EVT_UP) {
     span = step_round(span - 1);
   } else if (status & EVT_DOWN) {