Jog button hang and negative frequencies

nanovna.h

@@ -208,6 +208,7 @@ extern const char * const trc_channel_name[];
 
 #ifdef TINYSA3
 typedef uint32_t freq_t;
+#define HALF_FREQ 0x8000000UL
  typedef int32_t long_t;
  extern bool has_esd;
  #define CORRECTION_POINTS  10       // Frequency dependent level correction table entries
@@ -220,6 +221,7 @@ typedef uint32_t freq_t;
 #endif
 #ifdef TINYSA4
  typedef uint64_t freq_t;
+#define HALF_FREQ 0x800000000000000ULL
  typedef int64_t long_t;
  #define CORRECTION_POINTS  20       // Frequency dependent level correction table entries
  #define CORRECTION_LOW_IN   0

plot.c

@@ -1602,10 +1602,16 @@ static void trace_print_value_string(     // Only used at one place
         step = step*10;
       }
     }
+    int negative = (freq > HALF_FREQ);
+    if (negative)
+      freq = - freq;
 #ifdef TINYSA4
     if (freq >= 1000000000)
       digits += 3;
 #endif
+    if (negative)
+      plot_printf(ptr2, sizeof(buf2) - 9, "-%9.*QHz", digits, freq);
+    else
       plot_printf(ptr2, sizeof(buf2) - 9, "%9.*QHz", digits, freq);
   }
 #ifdef __LEVEL_METER__

ui.c

@@ -7057,11 +7057,14 @@ ui_process_menu_lever(void)
   const menuitem_t *menu = menu_stack[menu_current_level];
   int status = btn_check();
   if (status == 0) return;
-  if (selection >=0 && status & EVT_BUTTON_SINGLE_CLICK) {
+  uint16_t count = current_menu_get_count();
+  if (status & EVT_BUTTON_SINGLE_CLICK) {
+    if ((uint16_t)selection >= count)
+      ui_mode_normal();
+    else
       menu_invoke(selection);
     return;
   }
-  uint16_t count = current_menu_get_count();
   do {
     uint32_t mask = 1<<selection;
     if (status & EVT_UP  ) selection++;