Added deep sleep support on T3S3

Boards.h

@@ -79,6 +79,7 @@
   #define HAS_EEPROM false
   #define HAS_INPUT false
   #define HAS_SLEEP false
+  #define PIN_DISP_SLEEP -1
   #define VALIDATE_FIRMWARE true
 
   #if defined(ENABLE_TCXO)
@@ -353,11 +354,13 @@
       #define HAS_SD false
       #define HAS_EEPROM true
 
-      // #define HAS_INPUT true
-      // #define HAS_SLEEP true
-      // #define PIN_WAKEUP GPIO_NUM_0
-      // #define WAKEUP_LEVEL 0
-      // const int pin_btn_usr1 = 0;
+      #define HAS_INPUT true
+      #define HAS_SLEEP true
+      #define PIN_WAKEUP GPIO_NUM_0
+      #define WAKEUP_LEVEL 0
+      // #define PIN_DISP_SLEEP 21
+      // #define DISP_SLEEP_LEVEL HIGH
+      const int pin_btn_usr1 = 0;
 
       const int pin_cs = 7;
       const int pin_reset = 8;

Display.h

@@ -564,7 +564,15 @@ void update_disp_area() {
   }
 }
 
-void update_display() {
+void update_display(bool blank = false) {
+  if (blank) {
+    if (display_contrast != display_intensity) {
+      display_contrast = display_intensity;
+      set_contrast(&display, display_contrast);
+    }
+    display.clearDisplay();
+    display.display();    
+  } else {
     if (millis()-last_disp_update >= disp_update_interval) {
       if (display_contrast != display_intensity) {
         display_contrast = display_intensity;
@@ -576,6 +584,7 @@ void update_display() {
       display.display();
       last_disp_update = millis();
     }
+  }
 }
 
 void ext_fb_enable() {

RNode_Firmware.ino

@@ -77,7 +77,9 @@ void setup() {
   fifo_init(&serialFIFO, serialBuffer, CONFIG_UART_BUFFER_SIZE);
 
   Serial.begin(serial_baudrate);
+  #if BOARD_MODEL != BOARD_RNODE_NG_22
     while (!Serial);
+  #endif
 
   serial_interrupt_init();
 
@@ -1305,6 +1307,14 @@ void loop() {
 
 void sleep_now() {
   #if HAS_SLEEP == true
+    #if BOARD_MODEL == BOARD_RNODE_NG_22
+      display_intensity = 0;
+      update_display(true);
+    #endif
+    #if PIN_DISP_SLEEP >= 0
+      pinMode(PIN_DISP_SLEEP, OUTPUT);
+      digitalWrite(PIN_DISP_SLEEP, DISP_SLEEP_LEVEL);
+    #endif
     esp_sleep_enable_ext0_wakeup(PIN_WAKEUP, WAKEUP_LEVEL);
     esp_deep_sleep_start();
   #endif