chore: store velocity factor in float

main.c

@@ -618,7 +618,8 @@ properties_t current_props = {
   ._markers = {
     { 1, 30, 0 }, { 0, 40, 0 }, { 0, 60, 0 }, { 0, 80, 0 }
   },
-  ._velocity_factor =  70,
+  ._velocity_factor =  0.7,
+  ._marker_smith_format = MS_RLC
 };
 properties_t *active_props = &current_props;
 

nanovna.h

@@ -295,8 +295,8 @@ void ili9341_read_memory_continue(int len, uint16_t* out);
 
 typedef struct {
   uint32_t magic;
-  uint32_t _frequency0; // start or center
-  uint32_t _frequency1; // stop or span
+  uint32_t _frequency0;
+  uint32_t _frequency1;
   int16_t _sweep_points;
   uint16_t _cal_status;
 
@@ -306,14 +306,18 @@ typedef struct {
   
   trace_t _trace[TRACES_MAX];
   marker_t _markers[MARKERS_MAX];
-  int _active_marker;
-  uint8_t _domain_mode; /* 0bxxxxxffm : where ff: TD_FUNC m: DOMAIN_MODE */
-  uint8_t _velocity_factor; // %
 
-  uint8_t _reserved[54];
+  float _velocity_factor; // %
+  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;
 
+//sizeof(properties_t) == 0x1200
+
 #define CONFIG_MAGIC 0x434f4e45 /* 'CONF' */
 
 extern int16_t lastsaveid;
@@ -335,6 +339,7 @@ extern int8_t previous_marker;
 #define active_marker current_props._active_marker
 #define domain_mode current_props._domain_mode
 #define velocity_factor current_props._velocity_factor
+#define marker_smith_format current_props._marker_smith_format
 
 int caldata_save(int id);
 int caldata_recall(int id);
@@ -367,7 +372,6 @@ typedef struct {
   uint32_t previous_value;
   uint8_t lever_mode;
   bool marker_delta;
-  uint8_t marker_smith_format;
 } uistat_t;
 
 extern uistat_t uistat;

plot.c

@@ -636,7 +636,7 @@ format_smith_value(char *buf, int len, const float coeff[2], uint32_t frequency)
   float zi = 2*coeff[1] * d;
   int n;
 
-  switch (uistat.marker_smith_format) {
+  switch (marker_smith_format) {
   case MS_LIN:
     chsnprintf(buf, len, "%.2f %.1f" S_DEGREE, linear(coeff), phase(coeff));
     break;
@@ -829,7 +829,7 @@ static float time_of_index(int idx) {
 static float distance_of_index(int idx) {
 #define SPEED_OF_LIGHT 299792458
    float distance = ((float)idx * (float)SPEED_OF_LIGHT) / ( (float)(frequencies[1] - frequencies[0]) * (float)FFT_SIZE * 2.0);
-   return distance * (velocity_factor / 100.0);
+   return distance * velocity_factor;
 }
 
 
@@ -1687,7 +1687,7 @@ cell_draw_marker_info(int m, int n, int w, int h)
     cell_drawstring_5x7(w, h, buf, xpos, ypos, 0xffff);
     xpos += n * 5 + 5;
     float light_speed_ps = 299792458e-12; //(m/ps)
-    string_value_with_prefix(buf, sizeof buf, electrical_delay * light_speed_ps * velocity_factor / 100.0, 'm');
+    string_value_with_prefix(buf, sizeof buf, electrical_delay * light_speed_ps * velocity_factor, 'm');
     cell_drawstring_5x7(w, h, buf, xpos, ypos, 0xffff);
   }
 }

ui.c

@@ -31,7 +31,6 @@ uistat_t uistat = {
  current_trace: 0,
  lever_mode: LM_MARKER,
  marker_delta: FALSE,
- marker_smith_format: MS_RLC
 };
 
 
@@ -888,7 +887,7 @@ menu_marker_search_cb(int item)
 static void
 menu_marker_smith_cb(int item)
 {
-  uistat.marker_smith_format = item;
+  marker_smith_format = item;
   redraw_marker(active_marker, TRUE);
   draw_menu();
 }
@@ -1421,7 +1420,7 @@ menu_item_modify_attribute(const menuitem_t *menu, int item,
       }
     }
   } else if (menu == menu_marker_smith) {
-    if (uistat.marker_smith_format == item) {
+    if (marker_smith_format == item) {
       *bg = 0x0000;
       *fg = 0xffff;
     }
@@ -1590,7 +1589,7 @@ fetch_numeric_target(void)
     uistat.value = get_electrical_delay();
     break;
   case KM_VELOCITY_FACTOR:
-    uistat.value = velocity_factor;
+    uistat.value = velocity_factor * 100;
     break;
   case KM_SCALEDELAY:
     uistat.value = get_trace_scale(uistat.current_trace) * 1e12;
@@ -1894,7 +1893,7 @@ keypad_click(int key)
       set_electrical_delay(value); // pico seconds
       break;
     case KM_VELOCITY_FACTOR:
-      velocity_factor = value;
+      velocity_factor = value / 100.0;
       break;
     case KM_SCALEDELAY:
       set_trace_scale(uistat.current_trace, value * 1e-12); // pico second