LVGL to use PSRAM, clear chat bubbles on hide, config toggle to show memory usage in status bar.

firmware/lv_conf.h

@@ -13,10 +13,10 @@
 
 /* Memory */
 #define LV_MEM_CUSTOM 1
-#define LV_MEM_CUSTOM_INCLUDE <stdlib.h>
-#define LV_MEM_CUSTOM_ALLOC   malloc
+#define LV_MEM_CUSTOM_INCLUDE "lv_psram_alloc.h"
+#define LV_MEM_CUSTOM_ALLOC   lv_psram_malloc
 #define LV_MEM_CUSTOM_FREE    free
-#define LV_MEM_CUSTOM_REALLOC realloc
+#define LV_MEM_CUSTOM_REALLOC lv_psram_realloc
 
 /* Display — sized to the larger of supported boards (T-Watch Ultra 410x502).
    T-Deck Plus (320x240) uses less than the cap; the unused PSRAM is wasted

firmware/lv_psram_alloc.h

@@ -0,0 +1,21 @@
+#pragma once
+// LVGL memory allocator redirected to PSRAM on boards that have it.
+// Falls back to DRAM if PSRAM alloc fails (fragmentation / OOM safety net).
+// On targets without PSRAM (native_test) this is a transparent passthrough.
+#ifdef BOARD_HAS_PSRAM
+#  include <esp_heap_caps.h>
+static inline void* lv_psram_malloc(size_t size) {
+    void* p = heap_caps_malloc(size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
+    if (!p) p = malloc(size);
+    return p;
+}
+static inline void* lv_psram_realloc(void* ptr, size_t size) {
+    void* p = heap_caps_realloc(ptr, size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
+    if (!p && size > 0) p = realloc(ptr, size);
+    return p;
+}
+#else
+#  include <stdlib.h>
+static inline void* lv_psram_malloc(size_t size)             { return malloc(size); }
+static inline void* lv_psram_realloc(void* ptr, size_t size) { return realloc(ptr, size); }
+#endif

firmware/src/config/ConfigManager.cpp

@@ -391,6 +391,7 @@ bool ConfigManager::parseJson(const String& json) {
 
     // Debug — missing block defaults to all-off
     _config.debug.screenshots = doc["debug"]["screenshots"] | defaults::SCREENSHOTS_ENABLED;
+    _config.debug.showMemory  = doc["debug"]["show_memory"]  | false;
 
     LOGF("[Config] Loaded: device=%s, contacts=%d, channels=%d\n",
                   _config.deviceName.c_str(),
@@ -560,6 +561,9 @@ String ConfigManager::toJson() const {
     if (_config.debug.screenshots) {
         doc["debug"]["screenshots"] = _config.debug.screenshots;
     }
+    if (_config.debug.showMemory) {
+        doc["debug"]["show_memory"] = _config.debug.showMemory;
+    }
 
     String output;
     serializeJsonPretty(doc, output);

firmware/src/config/ConfigManager.h

@@ -126,6 +126,7 @@ struct BleConfig {
 };
 
 struct DebugConfig {
+    bool showMemory = false;     // Enable display of memory usage in status bar.
     bool screenshots = false;    // Enable save-screen-to-SD (/screenshots/*.bmp). Debug aid, default off.
 };
 

firmware/src/i18n/I18n.cpp

@@ -134,6 +134,7 @@ const DefaultString DEFAULT_STRINGS[] = {
     {"lbl_lock_mode",       "Lock Mode"},
     {"lbl_auto_lock",       "Auto-Lock"},
     {"lbl_screenshots",     "Save Screenshots"},
+    {"lbl_show_memory",     "Show Memory Usage"},
     {"lbl_theme",           "Theme"},
     {"theme_dark",          "Dark"},
     {"theme_light",         "Light"},

firmware/src/ui/ChatScreen.cpp

@@ -608,6 +608,7 @@ void ChatScreen::hide() {
             if (_cannedBtn) lv_group_remove_obj(_cannedBtn);
         }
     }
+    lv_obj_clean(_chatArea);
     lv_obj_add_flag(_screen, LV_OBJ_FLAG_HIDDEN);
 }
 

firmware/src/ui/SettingsScreen.cpp

@@ -511,8 +511,9 @@ void SettingsScreen::buildDisplay() {
                       1, 255, cfg.display.kbdBrightness, String(cfg.display.kbdBrightness), true);
     addSwitchRowGated(t("lbl_emoji"), cfg.display.emoji, emojiToggleCb, nullptr, false);
 
-    // Screenshots fold into Display (no separate Debug screen / header).
-    addSwitchRowGated(t("lbl_screenshots"), cfg.debug.screenshots, screenshotsToggleCb, nullptr, false);
+    // Screenshots and debug overlays fold into Display (no separate Debug screen / header).
+    addSwitchRowGated(t("lbl_screenshots"),  cfg.debug.screenshots, screenshotsToggleCb,  nullptr, false);
+    addSwitchRowGated(t("lbl_show_memory"),  cfg.debug.showMemory,  showMemoryToggleCb,   nullptr, false);
 }
 
 void SettingsScreen::buildMessaging() {
@@ -2912,4 +2913,11 @@ void SettingsScreen::screenshotsToggleCb(lv_event_t* e) {
     g_dsDirty = true;
 }
 
+void SettingsScreen::showMemoryToggleCb(lv_event_t* e) {
+    auto& mgr = ConfigManager::instance();
+    lv_obj_t* sw = lv_event_get_target(e);
+    mgr.config().debug.showMemory = lv_obj_has_state(sw, LV_STATE_CHECKED);
+    g_dsDirty = true;
+}
+
 }  // namespace mclite

firmware/src/ui/SettingsScreen.h

@@ -273,6 +273,7 @@ class SettingsScreen {
     static void themeRowCb(lv_event_t* e);   // opens the theme picker (reboots to apply)
     static void emojiToggleCb(lv_event_t* e);
     static void screenshotsToggleCb(lv_event_t* e);
+    static void showMemoryToggleCb(lv_event_t* e);
 };
 
 }  // namespace mclite

firmware/src/ui/StatusBar.cpp

@@ -7,8 +7,10 @@
 #include "../hal/Speaker.h"
 #include "../config/ConfigManager.h"
 #include "../util/TimeHelper.h"
+#include "../util/log.h"
 #include "../net/WiFiManager.h"
 #include "../companion/CompanionService.h"
+#include <esp_heap_caps.h>
 
 namespace mclite {
 
@@ -120,6 +122,11 @@ void StatusBar::create(lv_obj_t* parent) {
     _lblTime = lv_label_create(_footer);
     lv_obj_set_style_text_font(_lblTime, FONT_STATUSBAR_ICON, 0);
     lv_obj_set_style_text_color(_lblTime, theme::TEXT_PRIMARY(), 0);
+
+    _lblMem = lv_label_create(_footer);
+    lv_obj_set_style_text_font(_lblMem, FONT_SMALL, 0);
+    lv_obj_set_style_text_color(_lblMem, theme::TEXT_SECONDARY(), 0);
+    lv_label_set_text(_lblMem, "");
 #else
     // T-Deck: single flex-row, device name left (grow), icons right.
     lv_obj_set_flex_flow(_bar, LV_FLEX_FLOW_ROW);
@@ -147,6 +154,11 @@ void StatusBar::create(lv_obj_t* parent) {
 
     // --- Everything below is right-aligned (no flex_grow) ---
 
+    _lblMem = lv_label_create(_bar);
+    lv_obj_set_style_text_font(_lblMem, FONT_SMALL, 0);
+    lv_obj_set_style_text_color(_lblMem, theme::TEXT_SECONDARY(), 0);
+    lv_label_set_text(_lblMem, "");
+
     // Sound icon — clickable label, larger font for tap target
     _soundIcon = lv_label_create(_bar);
     lv_obj_set_style_text_font(_soundIcon, FONT_NORMAL, 0);
@@ -307,6 +319,36 @@ void StatusBar::update() {
         lv_label_set_text(_lblTime, "");
     }
 
+#if defined(ESP32)
+    // Memory usage — PSRAM and internal DRAM, logged every update and shown in status bar
+    {
+        if (_lblMem) {
+            if (cfg.debug.showMemory) {
+                const size_t dram_free = heap_caps_get_free_size(MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
+                const size_t dram_tot  = heap_caps_get_total_size(MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
+                const size_t dram_min  = heap_caps_get_minimum_free_size(MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
+                const size_t ps_free   = heap_caps_get_free_size(MALLOC_CAP_SPIRAM);
+                const size_t ps_tot    = heap_caps_get_total_size(MALLOC_CAP_SPIRAM);
+                const uint8_t ramPct   = dram_tot > 0 ? (uint8_t)(100 - (dram_free * 100 / dram_tot)) : 0;
+                const uint8_t psrPct   = ps_tot   > 0 ? (uint8_t)(100 - (ps_free   * 100 / ps_tot))   : 0;
+                char memBuf[16];
+                if (ps_tot > 0)
+                    snprintf(memBuf, sizeof(memBuf), "P%u%% R%u%%", (unsigned)psrPct, (unsigned)ramPct);
+                else
+                    snprintf(memBuf, sizeof(memBuf), "R%u%%", (unsigned)ramPct);
+                lv_label_set_text(_lblMem, memBuf);
+
+                LOGF("[Mem] DRAM %u/%u KB (min %u KB), PSRAM %u/%u KB\n",
+                     (unsigned)(dram_free / 1024), (unsigned)(dram_tot / 1024),
+                     (unsigned)(dram_min / 1024),
+                     (unsigned)(ps_free / 1024), (unsigned)(ps_tot / 1024));
+            } else {
+                lv_label_set_text(_lblMem, "");
+            }
+        }
+    }
+#endif
+
     // GPS indicator — green=live, amber=last known, gray=no fix
     if (!cfg.gpsEnabled) {
         // GPS disabled in config: keep the icon present but dimmed so the

firmware/src/ui/StatusBar.h

@@ -27,6 +27,7 @@ class StatusBar {
     lv_obj_t* _gpsIcon    = nullptr;
     lv_obj_t* _wifiIcon   = nullptr;  // shown only while WiFi is connected
     lv_obj_t* _bleIcon    = nullptr;  // shown only while BLE companion is active
+    lv_obj_t* _lblMem     = nullptr;  // "P{X}% R{Y}%" PSRAM/RAM usage
 
     static void soundClickCb(lv_event_t* e);
     static void gpsClickCb(lv_event_t* e);

sdcard/mclite/lang/de.json

@@ -106,6 +106,7 @@
     "lbl_kbd_backlight": "Tastenhelligkeit",
     "lbl_emoji": "Emoji-Auswahl",
     "lbl_screenshots": "Screenshots speichern",
+    "lbl_show_memory": "Speichernutzung zeigen",
     "lbl_boot_text": "Boot-Text",
     "lbl_history": "Verlauf speichern",
     "lbl_max_per_chat": "Max pro Chat",

sdcard/mclite/lang/fr.json

@@ -106,6 +106,7 @@
     "lbl_kbd_backlight": "Lumi clavier",
     "lbl_emoji": "Emoji",
     "lbl_screenshots": "Sauver captures",
+    "lbl_show_memory": "Afficher memoire",
     "lbl_boot_text": "Texte demarrage",
     "lbl_history": "Sauver historique",
     "lbl_max_per_chat": "Max par chat",

sdcard/mclite/lang/it.json

@@ -106,6 +106,7 @@
     "lbl_kbd_backlight": "Lumin tastiera",
     "lbl_emoji": "Emoji",
     "lbl_screenshots": "Salva screenshot",
+    "lbl_show_memory": "Mostra memoria",
     "lbl_boot_text": "Testo avvio",
     "lbl_history": "Salva cronologia",
     "lbl_max_per_chat": "Max per chat",