Huge reduce flash usage (about 5k), remove cal_data and _frequencies properties from data section

Use void loadDefaultProps() for load default properties (default loaded also on error load from flash)
Move some constants to nanovna.h

flash.c

@@ -122,12 +122,15 @@ config_recall(void)
 
 #define SAVEAREA_MAX 5
 
-const uint32_t saveareas[] =
-  { 0x08018800, 0x0801a000, 0x0801b800, 0x0801d000, 0x0801e800 };
+const uint32_t saveareas[SAVEAREA_MAX] = {
+  SAVE_CONFIG_0_ADDR,
+  SAVE_CONFIG_1_ADDR,
+  SAVE_CONFIG_2_ADDR,
+  SAVE_CONFIG_3_ADDR,
+  SAVE_CONFIG_4_ADDR };
 
 int16_t lastsaveid = 0;
 
-
 int
 caldata_save(int id)
 {
@@ -172,15 +175,15 @@ caldata_recall(int id)
   void *dst = &current_props;
 
   if (id < 0 || id >= SAVEAREA_MAX)
-    return -1;
+    goto load_default;
 
   // point to saved area on the flash memory
   src = (properties_t*)saveareas[id];
 
   if (src->magic != CONFIG_MAGIC)
-    return -1;
+    goto load_default;
   if (checksum(src, sizeof *src - sizeof src->checksum) != src->checksum)
-    return -1;
+    goto load_default;
 
   /* active configuration points to save data on flash memory */
   active_props = src;
@@ -188,8 +191,10 @@ caldata_recall(int id)
 
   /* duplicated saved data onto sram to be able to modify marker/trace */
   memcpy(dst, src, sizeof(properties_t));
-
   return 0;
+load_default:
+  loadDefaultProps();
+  return -1;
 }
 
 const properties_t *

main.c

@@ -725,28 +725,43 @@ config_t config = {
   .trace_color =       { DEFAULT_TRACE_1_COLOR, DEFAULT_TRACE_2_COLOR, DEFAULT_TRACE_3_COLOR, DEFAULT_TRACE_4_COLOR },
 //  .touch_cal =         { 693, 605, 124, 171 },  // 2.4 inch LCD panel
   .touch_cal =         { 338, 522, 153, 192 },  // 2.8 inch LCD panel
-  .default_loadcal =   0,
   .harmonic_freq_threshold = 300000000
 };
 
-properties_t current_props = {
-  .magic =             CONFIG_MAGIC,
-  ._frequency0 =       50000,     // start = 50kHz
-  ._frequency1 =       900000000, // end = 900MHz
-  ._sweep_points =     POINTS_COUNT,
-  ._trace = {/*enable, type, channel, reserved, scale, refpos*/
+properties_t current_props;
+properties_t *active_props = &current_props;
+
+// NanoVNA Default settings
+static const trace_t def_trace[TRACES_MAX] = {//enable, type, channel, reserved, scale, refpos
   { 1, TRC_LOGMAG, 0, 0, 10.0, NGRIDY-1 },
   { 1, TRC_LOGMAG, 1, 0, 10.0, NGRIDY-1 },
   { 1, TRC_SMITH,  0, 0, 1.0, 0 },
   { 1, TRC_PHASE,  1, 0, 90.0, NGRIDY/2 }
-  },
-  ._markers = {
-    { 1, 30, 0 }, { 0, 40, 0 }, { 0, 60, 0 }, { 0, 80, 0 }
-  },
-  ._velocity_factor =  0.7,
-  ._marker_smith_format = MS_RLC
 };
-properties_t *active_props = &current_props;
+
+static const marker_t def_markers[MARKERS_MAX] = {
+  { 1, 30, 0 }, { 0, 40, 0 }, { 0, 60, 0 }, { 0, 80, 0 }
+};
+
+// Load propeties default settings
+void loadDefaultProps(void){
+  current_props.magic = CONFIG_MAGIC;
+  current_props._frequency0   =     50000;    // start =  50kHz
+  current_props._frequency1   = 900000000;    // end   = 900MHz
+  current_props._sweep_points = POINTS_COUNT;
+  current_props._cal_status   = 0;
+//This data not loaded by default
+//current_props._frequencies[POINTS_COUNT];
+//current_props._cal_data[5][POINTS_COUNT][2];
+//=============================================
+  current_props._electrical_delay = 0.0;
+  memcpy(current_props._trace, def_trace, sizeof(def_trace));
+  memcpy(current_props._markers, def_markers, sizeof(def_markers));
+  current_props._velocity_factor =  0.7;
+  current_props._active_marker   = 0;
+  current_props._domain_mode     = 0;
+  current_props._marker_smith_format = MS_RLC;
+}
 
 void
 ensure_edit_config(void)
@@ -768,20 +783,19 @@ bool sweep(bool break_on_operation)
   int i;
   // blink LED while scanning
   palClearPad(GPIOC, GPIOC_LED);
-  for (i = 0; i < sweep_points; i++) {
-    int delay = set_frequency(frequencies[i]);
-    tlv320aic3204_select(0); // CH0:REFLECT
-    wait_dsp(delay);
+  for (i = 0; i < sweep_points; i++) {         // 8365
+    int delay = set_frequency(frequencies[i]); // 1560
+    tlv320aic3204_select(0);                   // 60 CH0:REFLECT
 
-    /* calculate reflection coefficient */
-    (*sample_func)(measured[0][i]);
-
-    tlv320aic3204_select(1); // CH1:TRANSMISSION
-    wait_dsp(DELAY_CHANNEL_CHANGE);
-
-    /* calculate transmission coefficient */
-    (*sample_func)(measured[1][i]);
+    wait_dsp(delay);                           // 3270
+    // calculate reflection coefficient
+    (*sample_func)(measured[0][i]);            // 60
 
+    tlv320aic3204_select(1);                   // 60 CH1:TRANSMISSION
+    wait_dsp(DELAY_CHANNEL_CHANGE);            // 2700
+    // calculate transmission coefficient
+    (*sample_func)(measured[1][i]);            // 60
+                                               // ======== 170 ===========
     if (cal_status & CALSTAT_APPLY)
       apply_error_term_at(i);
 
@@ -928,9 +942,6 @@ freq_mode_centerspan(void)
   }
 }
 
-#define START_MIN 50000
-#define STOP_MAX 2700000000U
-
 void
 set_sweep_frequency(int type, uint32_t freq)
 {
@@ -1472,14 +1483,12 @@ VNA_SHELL_FUNCTION(cmd_recall)
   int id = my_atoi(argv[0]);
   if (id < 0 || id >= SAVEAREA_MAX)
     goto usage;
-
-  if (caldata_recall(id) == 0) {
-    // success
+  // Check for success
+  if (caldata_recall(id) == -1)
+    shell_printf("Err, default load\r\n");
   update_frequencies();
   redraw_request |= REDRAW_CAL_STATUS;
-  }
   return;
-
  usage:
   shell_printf("recall {id}\r\n");
 }
@@ -2203,6 +2212,8 @@ int main(void)
 
 /* restore config */
   config_recall();
+/* restore frequencies and calibration 0 slot properties from flash memory */
+  caldata_recall(0);
 
   dac1cfg1.init = config.dac_value;
 /*
@@ -2214,10 +2225,6 @@ int main(void)
 /* initial frequencies */
   update_frequencies();
 
-/* restore frequencies and calibration properties from flash memory */
-  if (config.default_loadcal >= 0)
-    caldata_recall(config.default_loadcal);
-
 /*
  * I2S Initialize
  */

nanovna.h

@@ -25,6 +25,8 @@
 /*
  * main.c
  */
+#define START_MIN 50000
+#define STOP_MAX 2700000000U
 
 #define POINTS_COUNT 101
 extern float measured[2][POINTS_COUNT][2];
@@ -82,9 +84,21 @@ uint32_t get_sweep_frequency(int type);
 double my_atof(const char *p);
 
 void toggle_sweep(void);
+void loadDefaultProps(void);
 
 extern int8_t sweep_enabled;
 
+/*
+ *  flash.c
+ */
+#define SAVEAREA_MAX 5
+
+#define SAVE_CONFIG_0_ADDR 0x08018800
+#define SAVE_CONFIG_1_ADDR 0x0801a000
+#define SAVE_CONFIG_2_ADDR 0x0801b800
+#define SAVE_CONFIG_3_ADDR 0x0801d000
+#define SAVE_CONFIG_4_ADDR 0x0801e800
+
 /*
  * ui.c
  */
@@ -223,7 +237,7 @@ typedef struct {
   uint16_t menu_active_color;
   uint16_t trace_color[TRACES_MAX];
   int16_t  touch_cal[4];
-  int8_t default_loadcal;
+  int8_t   reserved_1;
   uint32_t harmonic_freq_threshold;
 
   uint8_t _reserved[24];

ui.c

@@ -490,13 +490,12 @@ static void
 menu_recall_cb(int item, uint8_t data)
 {
   (void)item;
-  if (caldata_recall(data) == 0) {
+  caldata_recall(data);
   menu_move_back();
   ui_mode_normal();
   update_grid();
   draw_cal_status();
 }
-}
 
 static void
 menu_config_cb(int item, uint8_t data)