diff --git a/examples/demo/LilyGoGui/LilyGoGui.ino b/examples/demo/LilyGoGui/LilyGoGui.ino
index 3b4f63d..8543ec3 100644
--- a/examples/demo/LilyGoGui/LilyGoGui.ino
+++ b/examples/demo/LilyGoGui/LilyGoGui.ino
@@ -54,7 +54,7 @@ IRsend irsend(BOARD_IR_PIN);
 #include "ui.h"
 #include "src/mp3_ring_1.h"
 #include "src/mp3_ring_setup.h"
-
+#include "driver/gpio.h"
 
 AudioFileSourceSPIFFS   *file_fs;
 AudioGeneratorWAV       *wav = NULL;
@@ -1486,7 +1486,7 @@ static void PDM_Record(const char *song_name, uint32_t duration)
 
     // Record until "file_size" bytes have been read from mic.
     uint32_t counter = 0;
-    uint32_t bytes_written;
+    size_t bytes_written = 0;
     Serial.println("Recording started");
     int percentage = 0;
 
diff --git a/examples/demo/LilyGoGui/app_wireless.cpp b/examples/demo/LilyGoGui/app_wireless.cpp
index f60fad1..86735e0 100644
--- a/examples/demo/LilyGoGui/app_wireless.cpp
+++ b/examples/demo/LilyGoGui/app_wireless.cpp
@@ -113,7 +113,7 @@ static struct {
 LV_FONT_DECLARE(alibaba_font);
 
 static lv_obj_t *create_obj_with_label(lv_obj_t *cont, textarea_config_t *u);
-static lv_obj_t *create_btn_on_label(lv_obj_t *cont, char *text);
+static lv_obj_t *create_btn_on_label(lv_obj_t *cont,const char *text);
 
 static void get_wifi_ssid_event_cb(lv_event_t *e);
 static void connect_wifi_event_cb(lv_event_t *e);
@@ -209,7 +209,7 @@ static lv_obj_t *create_obj_with_label(lv_obj_t *cont, textarea_config_t *u) {
   return obj;
 }
 
-static lv_obj_t *create_btn_on_label(lv_obj_t *cont, char *text) {
+static lv_obj_t *create_btn_on_label(lv_obj_t *cont,const char *text) {
 
   lv_obj_t *btn = lv_btn_create(cont);
   lv_obj_set_size(btn, 40, 35);
diff --git a/examples/demo/LilyGoGui/app_wireless.h b/examples/demo/LilyGoGui/app_wireless.h
index 5b9ac6d..18d8489 100644
--- a/examples/demo/LilyGoGui/app_wireless.h
+++ b/examples/demo/LilyGoGui/app_wireless.h
@@ -10,7 +10,7 @@ typedef struct {
   lv_align_t align;
   lv_coord_t x_ofs;
   lv_coord_t y_ofs;
-  char *text;
+  const char *text;
 } textarea_config_t;
 
 void app_wireless_load(lv_obj_t *cont);
diff --git a/examples/demo/LilyGoGui/ui.cpp b/examples/demo/LilyGoGui/ui.cpp
index 646b4d3..c975f95 100644
--- a/examples/demo/LilyGoGui/ui.cpp
+++ b/examples/demo/LilyGoGui/ui.cpp
@@ -46,7 +46,7 @@ extern lv_obj_t * batt_voltage_label;
 extern lv_timer_t *transmitTask;
 extern void suspend_vadTaskHandler(void);
 
-static void create_app(lv_obj_t *parent, char *name, const lv_img_dsc_t *img, app_t *app_fun) {
+static void create_app(lv_obj_t *parent,const char *name, const lv_img_dsc_t *img, app_t *app_fun) {
   /* Create an interactive button named after the app. */
   lv_obj_t *btn = lv_btn_create(parent);
   lv_obj_set_size(btn, 150, lv_pct(100));
@@ -69,7 +69,7 @@ static void create_app(lv_obj_t *parent, char *name, const lv_img_dsc_t *img, ap
           lv_msg_send(MSG_MENU_NAME_CHANGED, text);
         }
       },
-      LV_EVENT_FOCUSED, name);
+      LV_EVENT_FOCUSED, (void*)name);
   /* Click to select event callback */
   lv_obj_add_event_cb(
       btn,
diff --git a/src/LilyGoLib.cpp b/src/LilyGoLib.cpp
index dd9e20d..b59241e 100644
--- a/src/LilyGoLib.cpp
+++ b/src/LilyGoLib.cpp
@@ -574,15 +574,6 @@ void LilyGoLib::sleep(uint32_t second)
     esp_deep_sleep_start();
 }
 
-int16_t LilyGoLib::sleep()
-{
-    sleep(0);
-    return 0;
-}
-
-
-
-
 
 
 
diff --git a/src/LilyGoLib.h b/src/LilyGoLib.h
index 1080d65..06e0a6e 100644
--- a/src/LilyGoLib.h
+++ b/src/LilyGoLib.h
@@ -152,9 +152,7 @@ public:
     void sleepLora(bool config);
     void setSleepMode(SleepMode_t mode);
 
-    void sleep(uint32_t second) ;
-    int16_t sleep() override;
-
+    void sleep(uint32_t second = 0) ;
 private: