feat: add marker tracking

main.c

@@ -90,6 +90,14 @@ static THD_FUNCTION(Thread1, arg)
         if (completed) {
           plot_into_index(measured);
           redraw_request |= REDRAW_CELLS;
+
+          if (marker_tracking) {
+            int i = marker_search();
+            if (i != -1 && active_marker != -1) {
+              markers[active_marker].index = i;
+              redraw_request |= REDRAW_MARKER;
+            }
+          }
         }
       }
 

nanovna.h

@@ -221,8 +221,8 @@ typedef struct {
   uint32_t frequency;
 } marker_t;
 
-//extern marker_t markers[4];
-//extern int active_marker;
+extern int8_t previous_marker;
+extern int8_t marker_tracking;
 
 void plot_init(void);
 void update_grid(void);
@@ -244,7 +244,8 @@ void markmap_all_markers(void);
 
 void marker_position(int m, int t, int *x, int *y);
 int search_nearest_index(int x, int y, int t);
-int marker_search(int mode);
+void set_marker_search(int mode);
+int marker_search(void);
 int marker_search_left(int from);
 int marker_search_right(int from);
 
@@ -311,7 +312,6 @@ typedef struct {
   int8_t _active_marker;
   uint8_t _domain_mode; /* 0bxxxxxffm : where ff: TD_FUNC m: DOMAIN_MODE */
   uint8_t _marker_smith_format;
-
   uint8_t _reserved[50];
   int32_t checksum;
 } properties_t;
@@ -324,8 +324,6 @@ extern int16_t lastsaveid;
 extern properties_t *active_props;
 extern properties_t current_props;
 
-extern int8_t previous_marker;
-
 #define frequency0 current_props._frequency0
 #define frequency1 current_props._frequency1
 #define sweep_points current_props._sweep_points
@@ -380,8 +378,6 @@ void ui_init(void);
 void ui_show(void);
 void ui_hide(void);
 
-extern uint8_t operation_requested;
-
 void touch_start_watchdog(void);
 void touch_position(int *x, int *y);
 void handle_touch_interrupt(void);

plot.c

@@ -658,7 +658,8 @@ format_smith_value(char *buf, int len, const float coeff[2], uint32_t frequency)
 
   case MS_RX:
     n = string_value_with_prefix(buf, len, zr, S_OHM[0]);
-    buf[n++] = ' ';
+    if (zi >= 0)
+      buf[n++] = ' ';
     string_value_with_prefix(buf+n, len-n, zi, 'j');
     break;
 
@@ -1161,19 +1162,14 @@ static int greater(int x, int y) { return x > y; }
 static int lesser(int x, int y) { return x < y; }
 
 static int (*compare)(int x, int y) = lesser;
-
+int8_t marker_tracking = false;
 
 int
-marker_search(int mode)
+marker_search(void)
 {
   int i;
   int found = 0;
 
-  if (mode == 0)
-    compare = greater;
-  else
-    compare = lesser;
-
   if (uistat.current_trace == -1)
     return -1;
 
@@ -1189,6 +1185,15 @@ marker_search(int mode)
   return found;
 }
 
+void
+set_marker_search(int mode)
+{
+  if (mode == 0)
+    compare = greater;
+  else
+    compare = lesser;
+}
+
 int
 marker_search_left(int from)
 {

ui.c

@@ -862,7 +862,8 @@ menu_marker_search_cb(int item)
   switch (item) {
   case 0: /* maximum */
   case 1: /* minimum */
-    i = marker_search(item);
+    set_marker_search(item);
+    i = marker_search();
     if (i != -1)
       markers[active_marker].index = i;
     draw_menu();
@@ -879,6 +880,10 @@ menu_marker_search_cb(int item)
       markers[active_marker].index = i;
     draw_menu();
     break;
+  case 4: /* tracking */
+    marker_tracking = !marker_tracking;
+    draw_menu();
+    break;
   }
   redraw_marker(active_marker, TRUE);
   uistat.lever_mode = LM_SEARCH;
@@ -1085,7 +1090,7 @@ const menuitem_t menu_marker_search[] = {
   { MT_CALLBACK, "MINIMUM", menu_marker_search_cb },
   { MT_CALLBACK, "\2SEARCH\0" S_LARROW" LEFT", menu_marker_search_cb },
   { MT_CALLBACK, "\2SEARCH\0" S_RARROW" RIGHT", menu_marker_search_cb },
-  //{ MT_CALLBACK, "TRACKING", menu_marker_search_cb },
+  { MT_CALLBACK, "TRACKING", menu_marker_search_cb },
   { MT_CANCEL, S_LARROW" BACK", NULL },
   { MT_NONE, NULL, NULL } // sentinel
 };
@@ -1419,6 +1424,11 @@ menu_item_modify_attribute(const menuitem_t *menu, int item,
         *fg = 0xffff;
       }
     }
+  } else if (menu == menu_marker_search) {
+    if (item == 4 && marker_tracking) {
+      *bg = 0x0000;
+      *fg = 0xffff;
+    }
   } else if (menu == menu_marker_smith) {
     if (marker_smith_format == item) {
       *bg = 0x0000;