Add fast speedup menu option

nanovna.h

@@ -903,6 +903,7 @@ void set_switches(int);
 void set_trigger_level(float);
 void set_trigger(int);
 void update_rbw(void);
+void set_fast_speedup(int);
 //extern int setting_measurement;
 void self_test(int);
 //extern int setting_test;

sa_core.c

@@ -790,6 +790,14 @@ void set_mode(int m)
 
 extern int SI4432_offset_delay;
 
+int fast_speedup = 0;
+
+void set_fast_speedup(int s)
+{
+  fast_speedup = s;
+  dirty = true;
+}
+
 void calculate_step_delay(void)
 {
   if (setting.step_delay_mode == SD_MANUAL || setting.step_delay != 0) {        // The latter part required for selftest 3
@@ -824,6 +832,8 @@ void calculate_step_delay(void)
 #endif
       if (setting.step_delay_mode == SD_PRECISE)    // In precise mode wait twice as long for RSSI to stabalize
         SI4432_step_delay *= 2;
+      if (fast_speedup >0)
+        SI4432_offset_delay = SI4432_step_delay / fast_speedup;
     }
     if (setting.offset_delay != 0)      // Override if set
       SI4432_offset_delay = setting.offset_delay;

ui_sa.c

@@ -301,7 +301,7 @@ const uint16_t right_icons [] =
 enum {
   KM_START=1, KM_STOP, KM_CENTER, KM_SPAN, KM_CW, KM_REFLEVEL, KM_SCALE, KM_ATTENUATION,
   KM_ACTUALPOWER, KM_IF, KM_SAMPLETIME, KM_DRIVE, KM_LOWOUTLEVEL, KM_DECAY, KM_NOISE,
-  KM_10MHZ, KM_REPEAT, KM_OFFSET, KM_TRIGGER, KM_LEVELSWEEP, KM_SWEEP_TIME, KM_OFFSET_DELAY,
+  KM_10MHZ, KM_REPEAT, KM_OFFSET, KM_TRIGGER, KM_LEVELSWEEP, KM_SWEEP_TIME, KM_OFFSET_DELAY, KM_FAST_SPEEDUP
 };
 
 
@@ -516,6 +516,7 @@ static const keypads_t * const keypads_mode_tbl[] = {
   keypads_plusmin,    // KM_LEVELSWEEP
   keypads_time,     // KM_SWEEP_TIME
   keypads_positive, // KM_OFFSET_DELAY
+  keypads_positive, // KM_FAST_SPEEDUP
 };
 
 #ifdef __VNA__
@@ -527,7 +528,7 @@ static const char * const keypad_mode_label[] = {
 static const char * const keypad_mode_label[] = {
   "error", "START", "STOP", "CENTER", "SPAN", "FREQ", "\2REF\0LEVEL", "SCALE", // 0-7
   "ATTENUATE", "\2ACTUAL\0POWER", "IF", "\2SAMPLE\0DELAY", "DRIVE", "LEVEL", "SCANS", "LEVEL", // 8-15
-  "FREQ" , "\2SAMPLE\0REPEAT", "OFFSET", "\2TRIGGER\0LEVEL", "\2LEVEL\0SWEEP", "\2SWEEP\0SECONDS", "\2OFFSET\0DELAY" // 16-
+  "FREQ" , "\2SAMPLE\0REPEAT", "OFFSET", "\2TRIGGER\0LEVEL", "\2LEVEL\0SWEEP", "\2SWEEP\0SECONDS", "\2OFFSET\0DELAY", "\2FAST\0SPEEDUP" // 16-
 };
 #endif
 
@@ -1393,6 +1394,7 @@ static const menuitem_t menu_scanning_speed[] =
  { MT_CALLBACK,         SD_NORMAL,  "NORMAL",            menu_scanning_speed_cb},    // order must match definition of enum
  { MT_CALLBACK,         SD_PRECISE, "PRECISE",           menu_scanning_speed_cb},
  { MT_CALLBACK | MT_LOW,SD_FAST,    "FAST",              menu_scanning_speed_cb},
+ { MT_KEYPAD   | MT_LOW,KM_FAST_SPEEDUP,    "\2FAST\0SPEEDUP",   "2..20"},
  { MT_KEYPAD, KM_SAMPLETIME,        "\2SAMPLE\0DELAY",   "300..30000"},              // item number must match SD_MANUAL
  { MT_KEYPAD, KM_OFFSET_DELAY,      "\2OFFSET\0DELAY",   "300..30000"},              // item number must match SD_MANUAL
  { MT_CANCEL,   0,                  "\032 BACK", NULL },
@@ -1942,6 +1944,9 @@ set_numeric_value(void)
   case KM_OFFSET_DELAY:
     set_offset_delay(uistat.value);
     break;
+  case KM_FAST_SPEEDUP:
+    set_fast_speedup(uistat.value);
+    break;
   case KM_REPEAT:
     set_repeat(uistat.value);
     break;