Disable unused ChibiOS options:

CH_CFG_USE_WAITEXIT (used only is Shell run as thread)
CH_CFG_USE_EVENTS (NanoVNA not use events)
CH_CFG_USE_EVENTS_TIMEOUT (NanoVNA not use events)

Implement stack use check in "threads" command, now free stack space show in table as "stk free" in hex
Check stack usage by sweep, and main threads (seems all ok, but add 64 bytes to sweep)

Replace some const values to defined

chconf.h

@@ -156,7 +156,7 @@
  *
  * @note    The default is @p TRUE.
  */
-#define CH_CFG_USE_WAITEXIT                 TRUE
+#define CH_CFG_USE_WAITEXIT                 FALSE
 
 /**
  * @brief   Semaphores APIs.
@@ -221,7 +221,7 @@
  *
  * @note    The default is @p TRUE.
  */
-#define CH_CFG_USE_EVENTS                   TRUE
+#define CH_CFG_USE_EVENTS                   FALSE
 
 /**
  * @brief   Events Flags APIs with timeout.
@@ -231,7 +231,7 @@
  * @note    The default is @p TRUE.
  * @note    Requires @p CH_CFG_USE_EVENTS.
  */
-#define CH_CFG_USE_EVENTS_TIMEOUT           TRUE
+#define CH_CFG_USE_EVENTS_TIMEOUT           FALSE
 
 /**
  * @brief   Synchronous Messages APIs.

main.c

@@ -80,7 +80,11 @@ int8_t cal_auto_interpolate = TRUE;
 uint16_t redraw_request = 0; // contains REDRAW_XXX flags
 int16_t vbat = 0;
 
-static THD_WORKING_AREA(waThread1, 512);
+//
+// Profile stack usage (enable threads command by def ENABLE_THREADS_COMMAND) show:
+// Stack maximum usage = 480 bytes, free stack = 32+64 bytes
+//
+static THD_WORKING_AREA(waThread1, 512+64);
 static THD_FUNCTION(Thread1, arg)
 {
   (void)arg;
@@ -110,7 +114,7 @@ static THD_FUNCTION(Thread1, arg)
         draw_battery_status();
       }
 
-        /* calculate trace coordinates and plot only if scan completed */
+      // calculate trace coordinates and plot only if scan completed
       if (completed) {
         plot_into_index(measured);
         redraw_request |= REDRAW_CELLS;
@@ -124,8 +128,7 @@ static THD_FUNCTION(Thread1, arg)
         }
       }
     }
-
-      /* plot trace and other indications as raster */
+    // plot trace and other indications as raster
     draw_all(completed); // flush markmap only if scan completed to prevent remaining traces
     chMtxUnlock(&mutex);
   }
@@ -207,6 +210,7 @@ transform_domain(void)
           break;
   }
 
+
   for (int ch = 0; ch < 2; ch++) {
       memcpy(tmp, measured[ch], sizeof(measured[0]));
       for (int i = 0; i < POINTS_COUNT; i++) {
@@ -1939,12 +1943,22 @@ VNA_SHELL_FUNCTION(cmd_threads) {
   thread_t *tp;
   (void)argc;
   (void)argv;
-  chprintf(chp, "stklimit    stack     addr refs prio     state         name"VNA_SHELL_NEWLINE_STR);
+  shell_printf("stklimit|   stack|stk free|    addr|refs|prio|    state|        name"VNA_SHELL_NEWLINE_STR);
   tp = chRegFirstThread();
   do {
+    uint32_t max_stack_use = 0U;
+#if (CH_DBG_ENABLE_STACK_CHECK == TRUE) || (CH_CFG_USE_DYNAMIC == TRUE)
     uint32_t stklimit = (uint32_t)tp->wabase;
-    shell_printf("%08x %08x %08x %4u %4u %9s %12s"VNA_SHELL_NEWLINE_STR,
-             stklimit, (uint32_t)tp->ctx.sp, (uint32_t)tp,
+#if CH_DBG_FILL_THREADS == TRUE
+    uint8_t *p = (uint8_t *)tp->wabase; while(p[max_stack_use]==CH_DBG_STACK_FILL_VALUE) max_stack_use++;
+#endif
+#else
+    uint32_t stklimit = 0U;
+#endif
+
+
+    shell_printf("%08x|%08x|%08x|%08x|%4u|%4u|%9s|%12s"VNA_SHELL_NEWLINE_STR,
+             stklimit, (uint32_t)tp->ctx.sp, max_stack_use, (uint32_t)tp,
              (uint32_t)tp->refs - 1, (uint32_t)tp->prio, states[tp->state],
              tp->name == NULL ? "" : tp->name);
     tp = chRegNextThread(tp);
@@ -2142,6 +2156,11 @@ static DACConfig dac1cfg1 = {
   datamode:     DAC_DHRM_12BIT_RIGHT
 };
 
+
+// Main thread stack size defined in makefile USE_PROCESS_STACKSIZE = 0x200
+// Profile stack usage (enable threads command by def ENABLE_THREADS_COMMAND) show:
+// Stack maximum usage = 472 bytes (need test more and run all commands), free stack = 40 bytes
+//
 int main(void)
 {
   halInit();
@@ -2156,13 +2175,12 @@ int main(void)
 
   // MCO on PA8
   //palSetPadMode(GPIOA, 8, PAL_MODE_ALTERNATE(0));
-  /*
+/*
  * Initializes a serial-over-USB CDC driver.
  */
   sduObjectInit(&SDU1);
   sduStart(&SDU1, &serusbcfg);
-
-  /*
+/*
  * Activates the USB driver and then the USB bus pull-up on D+.
  * Note, a delay is inserted in order to not have to disconnect the cable
  * after a reset.
@@ -2172,36 +2190,29 @@ int main(void)
   usbStart(serusbcfg.usbp, &usbcfg);
   usbConnectBus(serusbcfg.usbp);
 
-  /*
+/*
  * SPI LCD Initialize
  */
   ili9341_init();
 
-  /*
-   * Initialize graph plotting
-   */
-  plot_init();
-
-  /* restore config */
+/* restore config */
   config_recall();
 
   dac1cfg1.init = config.dac_value;
-  /*
+/*
  * Starting DAC1 driver, setting up the output pin as analog as suggested
  * by the Reference Manual.
  */
   dacStart(&DACD2, &dac1cfg1);
 
-  /* initial frequencies */
+/* initial frequencies */
   update_frequencies();
 
-  /* restore frequencies and calibration properties from flash memory */
+/* restore frequencies and calibration properties from flash memory */
   if (config.default_loadcal >= 0)
     caldata_recall(config.default_loadcal);
 
-  redraw_frame();
-
-  /*
+/*
  * I2S Initialize
  */
   tlv320aic3204_init();
@@ -2211,12 +2222,17 @@ int main(void)
   i2sStartExchange(&I2SD2);
 
   ui_init();
-
+  //Initialize graph plotting
+  plot_init();
+  redraw_frame();
   chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO-1, Thread1, NULL);
 
   while (1) {
     if (SDU1.config->usbp->state == USB_ACTIVE) {
 #ifdef VNA_SHELL_THREAD
+#if CH_CFG_USE_WAITEXIT == FALSE
+#error "VNA_SHELL_THREAD use chThdWait, need enable CH_CFG_USE_WAITEXIT in chconf.h"
+#endif
       thread_t *shelltp = chThdCreateStatic(waThread2, sizeof(waThread2),
                                             NORMALPRIO + 1,
                                             myshellThread, NULL);

plot.c

@@ -1462,7 +1462,7 @@ cell_drawstring(char *str, int x, int y)
 static void
 cell_draw_marker_info(int x0, int y0)
 {
-  char buf[32];
+  char buf[24];
   int t;
   if (active_marker < 0)
     return;
@@ -1474,8 +1474,8 @@ cell_draw_marker_info(int x0, int y0)
     for (mk = 0; mk < MARKERS_MAX; mk++) {
       if (!markers[mk].enabled)
         continue;
-      int xpos = 1 + (j%2)*146 + CELLOFFSETX - x0;
-      int ypos = 1 + (j/2)*8 - y0;
+      int xpos = 1 + (j%2)*(WIDTH/2) + CELLOFFSETX - x0;
+      int ypos = 1 + (j/2)*(FONT_GET_HEIGHT+1) - y0;
 
       setForegroundColor(config.trace_color[t]);
       if (mk == active_marker)
@@ -1507,13 +1507,13 @@ cell_draw_marker_info(int x0, int y0)
     // draw marker delta
     if (!uistat.marker_delta && previous_marker >= 0 && active_marker != previous_marker && markers[previous_marker].enabled) {
       int idx0 = markers[previous_marker].index;
-      int xpos = 180 + CELLOFFSETX - x0;
-      int ypos = 1 + (j/2)*8 - y0;
+      int xpos = (WIDTH/2+30) + CELLOFFSETX - x0;
+      int ypos = 1 + (j/2)*(FONT_GET_HEIGHT+1) - y0;
 
-      plot_printf(buf, sizeof buf, S_DELTA"%d-%d", active_marker+1, previous_marker+1);
+      plot_printf(buf, sizeof buf, S_DELTA"%d-%d:", active_marker+1, previous_marker+1);
       setForegroundColor(DEFAULT_FG_COLOR);
       cell_drawstring(buf, xpos, ypos);
-      xpos += 24;
+      xpos += 27;
       if ((domain_mode & DOMAIN_MODE) == DOMAIN_FREQ) {
         uint32_t freq  = frequencies[idx];
         uint32_t freq1 = frequencies[idx0];
@@ -1528,8 +1528,8 @@ cell_draw_marker_info(int x0, int y0)
     for (t = 0; t < TRACES_MAX; t++) {
       if (!trace[t].enabled)
         continue;
-      int xpos = 1 + (j%2)*146 + CELLOFFSETX - x0;
-      int ypos = 1 + (j/2)*8 - y0;
+      int xpos = 1 + (j%2)*(WIDTH/2) + CELLOFFSETX - x0;
+      int ypos = 1 + (j/2)*(FONT_GET_HEIGHT+1) - y0;
 
       setForegroundColor(config.trace_color[t]);
       if (t == uistat.current_trace)
@@ -1550,8 +1550,8 @@ cell_draw_marker_info(int x0, int y0)
     }
 
     // draw marker frequency
-    int xpos = 185 + CELLOFFSETX - x0;
-    int ypos = 1 + (j/2)*8 - y0;
+    int xpos = (WIDTH/2+40) + CELLOFFSETX - x0;
+    int ypos = 1 + (j/2)*(FONT_GET_HEIGHT+1) - y0;
 
     setForegroundColor(DEFAULT_FG_COLOR);
     if (uistat.lever_mode == LM_MARKER)
@@ -1572,7 +1572,7 @@ cell_draw_marker_info(int x0, int y0)
   if (electrical_delay != 0) {
     // draw electrical delay
     int xpos = 21 + CELLOFFSETX - x0;
-    int ypos = 1 + ((j+1)/2)*8 - y0;
+    int ypos = 1 + ((j+1)/2)*(FONT_GET_HEIGHT+1) - y0;
 
     float light_speed_ps = 299792458e-12; //(m/ps)
     plot_printf(buf, sizeof buf, "Edelay %Fs %Fm", electrical_delay * 1e-12,
@@ -1663,7 +1663,7 @@ draw_battery_status(void)
 {
   if (vbat<=0)
     return;
-  uint8_t string_buf[25];
+  uint8_t string_buf[16];
   // Set battery color
   setForegroundColor(vbat < BATTERY_WARNING_LEVEL ? DEFAULT_LOW_BAT_COLOR : DEFAULT_NORMAL_BAT_COLOR);
   setBackgroundColor(DEFAULT_BG_COLOR);
@@ -1697,7 +1697,8 @@ request_to_redraw_grid(void)
 void
 redraw_frame(void)
 {
-  ili9341_fill(0, 0, 320, 240, DEFAULT_BG_COLOR);
+  setBackgroundColor(DEFAULT_BG_COLOR);
+  clearScreen();
   draw_frequencies();
   draw_cal_status();
 }

ui.c

@@ -1271,7 +1271,7 @@ draw_numeric_area_frame(void)
   ili9341_fill(0, 240-NUM_INPUT_HEIGHT, 320, NUM_INPUT_HEIGHT, DEFAULT_MENU_COLOR);
   setForegroundColor(DEFAULT_MENU_TEXT_COLOR);
   setBackgroundColor(DEFAULT_MENU_COLOR);
-  ili9341_drawstring(keypad_mode_label[keypad_mode], 10, 240-FONT_GET_HEIGHT-(NUM_INPUT_HEIGHT-FONT_GET_HEIGHT)/2);
+  ili9341_drawstring(keypad_mode_label[keypad_mode], 10, 240-(FONT_GET_HEIGHT+NUM_INPUT_HEIGHT)/2);
   //ili9341_drawfont(KP_KEYPAD, 300, 216);
 }
 
@@ -1297,8 +1297,8 @@ draw_numeric_input(const char *buf)
     if (ui_mode == UI_NUMERIC && uistat.digit == 8-i) {
       fg = DEFAULT_SPEC_INPUT_COLOR;
       focused = TRUE;
-      if (uistat.digit_mode)
-        bg = DEFAULT_MENU_COLOR;
+//      if (uistat.digit_mode)
+//        bg = DEFAULT_MENU_COLOR;
     }
     setForegroundColor(fg);
     setBackgroundColor(bg);
@@ -1307,12 +1307,12 @@ draw_numeric_input(const char *buf)
     else if (focused) // c not number, but focused
       ili9341_drawfont(0, x, 240-NUM_INPUT_HEIGHT+4);
     else // erase
-      ili9341_fill(x, 240-NUM_INPUT_HEIGHT+4, 20, 24, bg);
+      ili9341_fill(x, 240-NUM_INPUT_HEIGHT+4, NUM_FONT_GET_HEIGHT, NUM_FONT_GET_WIDTH+2+8, bg);
       
     x += xsim&0x8000 ? NUM_FONT_GET_WIDTH+2+8 : NUM_FONT_GET_WIDTH+2;
   }
   // erase last
-  ili9341_fill(x, 240-NUM_INPUT_HEIGHT+4, NUM_FONT_GET_WIDTH+2+8, 24, DEFAULT_MENU_COLOR);
+  ili9341_fill(x, 240-NUM_INPUT_HEIGHT+4, NUM_FONT_GET_WIDTH+2+8, NUM_FONT_GET_WIDTH+2+8, DEFAULT_MENU_COLOR);
 }
 
 static int
@@ -1607,7 +1607,7 @@ ui_mode_numeric(int _keypad_mode)
   keypad_mode = _keypad_mode;
   ui_mode = UI_NUMERIC;
   area_width = AREA_WIDTH_NORMAL;
-  area_height = 240-32;//AREA_HEIGHT_NORMAL - 32;
+  area_height = 240-NUM_INPUT_HEIGHT;//AREA_HEIGHT_NORMAL - 32;
 
   draw_numeric_area_frame();
   fetch_numeric_target();
@@ -1629,7 +1629,7 @@ ui_mode_keypad(int _keypad_mode)
   keypads_last_index = i;
 
   ui_mode = UI_KEYPAD;
-  area_width = AREA_WIDTH_NORMAL - 60;
+  area_width = AREA_WIDTH_NORMAL - MENU_BUTTON_WIDTH;
   area_height = HEIGHT - 32;
   draw_menu();
   draw_keypad();
@@ -2051,7 +2051,6 @@ ui_process_lever(void)
   }
 }
 
-
 static void
 drag_marker(int t, int m)
 {