memory optimization, only three tabs in memory at the same time

Platformio/platformio.ini

@@ -18,31 +18,83 @@ board_build.f_cpu = 240000000L
 board_build.partitions = huge_app.csv
 upload_speed = 1000000
 lib_deps = 
-	sparkfun/SparkFun LIS3DH Arduino Library@^1.0.3
-	crankyoldgit/IRremoteESP8266@^2.8.4
+	bodmer/TFT_eSPI@^2.5.23
 	adafruit/Adafruit FT6206 Library@^1.0.6
 	lvgl/lvgl@^8.3.4
-	bodmer/TFT_eSPI@^2.5.23
+	sparkfun/SparkFun LIS3DH Arduino Library@^1.0.3
+	crankyoldgit/IRremoteESP8266@^2.8.4
 	knolleary/PubSubClient@^2.8
 	h2zero/NimBLE-Arduino@^1.4.1
+	;chris--a/Keypad@^3.1.1
 	;t-vk/ESP32 BLE Keyboard@^0.3.2
 build_flags = 
-	-D DISABLE_ALL_LIBRARY_WARNINGS=1 ; for TFT_eSPI
-	-D USE_NIMBLE=1 ; for BLE Keyboard
-	-D CORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_DEBUG
-	-D LV_CONF_PATH=../../../../src/gui_general_and_keys/lv_conf.h
+	;-- OMOTE -----------------------------------------------------------------
+	-D ENABLE_WIFI_AND_MQTT=1
+	-D ENABLE_BLUETOOTH=1
+	;-- Arduino log -----------------------------------------------------------
+	;-D CORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_NONE
+	;-D CORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_ERROR
+	;-D CORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_WARN
+	-D CORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_INFO
+	;-D CORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_DEBUG
+	;-D CORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_VERBOSE
+	;-- lvgl ------------------------------------------------------------------
+	; lvgl variant 1:
+	; Don't use lv_conf.h. Tweak params via platfom.ini. See lv_conf_internal.h line 31. Don't change this line.
+	-D LV_CONF_SKIP=1
+	; use millis() from "Arduino.h" to tell the elapsed time in milliseconds
+	-D LV_TICK_CUSTOM=1
+	; dynamic memory. Takes as much as it gets from heap (DRAM). Needs approx. 25%-30% more memory than static memory.
+	;-D LV_MEM_CUSTOM=1
+	; static memory, will be allocated in static DRAM
+	-D LV_MEM_CUSTOM=0
+	-D LV_MEM_SIZE="(32U * 1024U)"
+	; fonts and theme
+	-D LV_FONT_MONTSERRAT_10=1
+	-D LV_FONT_MONTSERRAT_12=1
+	-D LV_FONT_MONTSERRAT_16=1
+	-D LV_FONT_MONTSERRAT_24=1
+	-D LV_THEME_DEFAULT_DARK=1
+	; don't build examples
+	-D LV_BUILD_EXAMPLES=0
+	; Enable the log module
+	-D LV_USE_LOG=1
+	-D LV_LOG_PRINTF=1
+	;-D LV_LOG_LEVEL=LV_LOG_LEVEL_TRACE
+	;-D LV_LOG_LEVEL=LV_LOG_LEVEL_INFO
+	;-D LV_LOG_LEVEL=LV_LOG_LEVEL_WARN
+	-D LV_LOG_LEVEL=LV_LOG_LEVEL_ERROR
+	;-D LV_LOG_LEVEL=LV_LOG_LEVEL_USER
+	;-D LV_LOG_LEVEL=LV_LOG_LEVEL_NONE
+	; trace really gives a lot of messages ...
+	;-D LV_LOG_LEVEL=LV_LOG_LEVEL_TRACE
+	; ---
+	; Enable asserts if an operation is failed or an invalid data is found.
+	; If LV_USE_LOG is enabled an error message will be printed on failure*/
+	; /*Check if the styles are properly initialized. (Very fast, recommended)*/
+	-D LV_USE_ASSERT_STYLE=1
+	; /*Check the integrity of `lv_mem` after critical operations. (Slow)*/
+	;-D LV_USE_ASSERT_MEM_INTEGRITY=1
+	; /*Check the object's type and existence (e.g. not deleted). (Slow)*/
+	;-D LV_USE_ASSERT_OBJ=1
+	; ---------
+	; lvgl variant 2:
+	; or define where lv_conf.h is, relative to the `lvgl` folder
+	;-D LV_CONF_PATH=../../../../src/gui_general_and_keys/lv_conf.h
+	;-- TFT_eSPI --------------------------------------------------------------
+	-D DISABLE_ALL_LIBRARY_WARNINGS=1
 	; The following lines replace the TFT_eSPI User_setup.h-file
 	-D USER_SETUP_LOADED=1
 	-D ILI9341_DRIVER=1
 	-D TFT_WIDTH=240
 	-D TFT_HEIGHT=320
+	;-D TFT_MISO
 	-D TFT_MOSI=23
 	-D TFT_SCLK=18
 	-D TFT_CS=5
 	-D TFT_DC=9
 	-D TFT_RST=-1
 	-D SPI_FREQUENCY=40000000 ; 40MHz default, some displays might support 80MHz
-	-D SPI_TOUCH_FREQUENCY=2500000
 	; TFT_eSPI fonts are disabled by default
 	;-D LOAD_GLCD=1
 	;-D LOAD_FONT2=1
@@ -52,3 +104,5 @@ build_flags =
 	;-D LOAD_FONT8=1
 	;-D LOAD_GFXFF=1
 	;-D SMOOTH_FONT=1
+    ;-- for BLE Keyboard. Don't change this line! -----------------------------
+	-D USE_NIMBLE=1

Platformio/src/commandHandler.cpp

@@ -126,7 +126,7 @@ void executeCommandWithData(std::string command, commandData commandData, std::s
       break;
     }
 
-    #ifdef ENABLE_WIFI_AND_MQTT
+    #if ENABLE_WIFI_AND_MQTT == 1
     case MQTT: {
       auto current = commandData.commandPayloads.begin();
       std::string topic = *current;

Platformio/src/commandHandler.h

@@ -1,9 +1,6 @@
 #ifndef __COMMANDHANDLER_H__
 #define __COMMANDHANDLER_H__
 
-#define ENABLE_WIFI_AND_MQTT // Comment out to disable WiFi
-#define ENABLE_BLUETOOTH     // Comment out to disable Bluetooth
-
 #include <Arduino.h>
 #include <string>
 #include <list>
@@ -104,7 +101,7 @@ enum commandHandlers {
   IR_SONY,
   IR_RC5,
   IR_DENON,
-  #ifdef ENABLE_WIFI_AND_MQTT
+  #if ENABLE_WIFI_AND_MQTT == 1
   MQTT,
   #endif
   #ifdef ENABLE_KEYBOARD_BLE

Platformio/src/device_appleTV/gui_appleTV.cpp

@@ -1,5 +1,6 @@
 #include <lvgl.h>
 #include "device_appleTV/device_appleTV.h"
+#include "device_appleTV/gui_appleTV.h"
 #include "gui_general_and_keys/guiBase.h"
 #include "gui_general_and_keys/guiRegistry.h"
 #include "hardware/tft.h"
@@ -17,11 +18,9 @@ static void appleKey_event_cb(lv_event_t* e) {
   Serial.println(50 + (int)e->user_data);
 }
 
-void init_gui_tab_appleTV(lv_obj_t* tabview) {
+void create_tab_content_appleTV(lv_obj_t* tab) {
 
-  lv_obj_t* tab = lv_tabview_add_tab(tabview, "Apple TV");
-
-  // Add content to the Apple TV tab (3)
+  // Add content to the Apple TV tab
   // Add a nice apple tv logo
   lv_obj_t* appleImg = lv_img_create(tab);
   lv_img_set_src(appleImg, &appleTvIcon);
@@ -52,22 +51,15 @@ void init_gui_tab_appleTV(lv_obj_t* tabview) {
   lv_obj_set_style_img_recolor(appleImg, lv_color_white(), LV_PART_MAIN);
   lv_obj_set_style_img_recolor_opa(appleImg, LV_OPA_COVER, LV_PART_MAIN);
   lv_obj_align(appleImg, LV_ALIGN_CENTER, 0, 0);
-  
+
 }
 
-void init_gui_pageIndicator_appleTV(lv_obj_t* panel) {
-  // Create actual (non-clickable) buttons for every tab
-  lv_obj_t* btn = lv_btn_create(panel);
-  lv_obj_clear_flag(btn, LV_OBJ_FLAG_CLICKABLE);
-  lv_obj_set_size(btn, 150, lv_pct(100));
-  lv_obj_t* label = lv_label_create(btn);
-  lv_label_set_text_fmt(label, "Apple TV");
-  lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
-  lv_obj_set_style_shadow_width(btn, 0, LV_PART_MAIN);
-  lv_obj_set_style_bg_color(btn, color_primary, LV_PART_MAIN);
+void notify_tab_before_delete_appleTV(void) {
+  // remember to set all pointers to lvgl objects to NULL if they might be accessed from outside.
+  // They must check if object is NULL and must not use it if so
 
 }
 
 void register_gui_appleTV(void){
-  register_gui(& init_gui_tab_appleTV, & init_gui_pageIndicator_appleTV);
+  register_gui(std::string(tabName_appleTV), & create_tab_content_appleTV, & notify_tab_before_delete_appleTV);
 }

Platformio/src/device_appleTV/gui_appleTV.h

@@ -3,6 +3,7 @@
 
 #include <lvgl.h>
 
+const char * const tabName_appleTV = "Apple TV";
 void register_gui_appleTV(void);
 
 #endif /*__GUI_APPLETV_H__*/

Platformio/src/device_keyboard_ble/device_keyboard_ble.cpp

@@ -38,16 +38,16 @@ bool blinkBluetoothLabelIsOn = false;
 
 void update_keyboard_ble_status() {
   if (bleKeyboard.isConnected()) {
-    lv_label_set_text(BluetoothLabel, LV_SYMBOL_BLUETOOTH);
+    if (BluetoothLabel != NULL) {lv_label_set_text(BluetoothLabel, LV_SYMBOL_BLUETOOTH);}
     bleKeyboard.setBatteryLevel(battery_percentage);
 
   } else {
     if(millis() - blinkBluetoothLabelLastChange >= 1000){
       blinkBluetoothLabelIsOn = !blinkBluetoothLabelIsOn;
       if (blinkBluetoothLabelIsOn) {
-        lv_label_set_text(BluetoothLabel, LV_SYMBOL_BLUETOOTH);
+        if (BluetoothLabel != NULL) {lv_label_set_text(BluetoothLabel, LV_SYMBOL_BLUETOOTH);}
       } else {
-        lv_label_set_text(BluetoothLabel, "");
+        if (BluetoothLabel != NULL) {lv_label_set_text(BluetoothLabel, "");}
       }
       blinkBluetoothLabelLastChange = millis();
     }

Platformio/src/device_keyboard_ble/device_keyboard_ble.h

@@ -8,10 +8,8 @@
 
 #ifdef ENABLE_KEYBOARD_BLE
 
-#include "commandHandler.h"
-
-#if defined(ENABLE_KEYBOARD_BLE) && !defined(ENABLE_BLUETOOTH)
-static_assert(false, "You have to use \"#define ENABLE_BLUETOOTH\" in \"commandHandler.h\" when having \"#define ENABLE_KEYBOARD_BLE\"");
+#if defined(ENABLE_KEYBOARD_BLE) && !(ENABLE_BLUETOOTH == 1)
+static_assert(false, "You have to use \"-D ENABLE_BLUETOOTH=1\" in \"platformio.ini\" when having \"#define ENABLE_KEYBOARD_BLE\"");
 #endif
 
 #include <BleKeyboard.h>

Platformio/src/device_keyboard_mqtt/device_keyboard_mqtt.h

@@ -10,10 +10,8 @@
 
 // if you activate the MQTT keyboard, consider changing the mapping of the keyboard commands to the MQTT keyboard in file "commandHandler.h"
 
-#include "commandHandler.h"
-
-#if defined(ENABLE_KEYBOARD_MQTT) && !defined(ENABLE_WIFI_AND_MQTT)
-static_assert(false, "You have to use \"#define ENABLE_WIFI_AND_MQTT\" in \"commandHandler.h\" when having \"#define ENABLE_KEYBOARD_MQTT\"");
+#if defined(ENABLE_KEYBOARD_MQTT) && !(ENABLE_WIFI_AND_MQTT == 1)
+static_assert(false, "You have to use \"-D ENABLE_WIFI_AND_MQTT=1\" in \"platformio.ini\" when having \"#define ENABLE_KEYBOARD_MQTT\"");
 #endif
 
 #define KEYBOARD_MQTT_UP                   "Keyboard_mqtt_up"