Update sleep screen

src/main.cpp

@@ -12,6 +12,7 @@
 #include "screens/EpubReaderScreen.h"
 #include "screens/FileSelectionScreen.h"
 #include "screens/FullScreenMessageScreen.h"
+#include "screens/SleepScreen.h"
 
 #define SPI_FQ 40000000
 // Display SPI pins (custom pins for XteinkX4, not hardware SPI defaults)
@@ -94,7 +95,7 @@ void waitForNoButton() {
 // Enter deep sleep mode
 void enterDeepSleep() {
   exitScreen();
-  enterNewScreen(new FullScreenMessageScreen(renderer, "Sleeping", BOLD, true, false));
+  enterNewScreen(new SleepScreen(renderer));
 
   Serial.println("Power button released after a long press. Entering deep sleep.");
   delay(1000);  // Allow Serial buffer to empty and display to update
@@ -135,8 +136,12 @@ void onGoHome() {
 void setup() {
   setupInputPinModes();
   verifyWakeupLongPress();
-  Serial.begin(115200);
-  Serial.println("Booting...");
+
+  // Begin serial only if USB connected
+  pinMode(UART0_RXD, INPUT);
+  if (digitalRead(UART0_RXD) == HIGH) {
+    Serial.begin(115200);
+  }
 
   // Initialize pins
   pinMode(BAT_GPIO0, INPUT);

src/screens/FileSelectionScreen.h

@@ -1,7 +1,7 @@
 #pragma once
 #include <freertos/FreeRTOS.h>
-#include <freertos/task.h>
 #include <freertos/semphr.h>
+#include <freertos/task.h>
 
 #include <functional>
 #include <string>

src/screens/SleepScreen.cpp

@@ -0,0 +1,7 @@
+#include "SleepScreen.h"
+
+#include <EpdRenderer.h>
+
+#include "images/SleepScreenImg.h"
+
+void SleepScreen::onEnter() { renderer->drawImageNoMargin(SleepScreenImg, 0, 0, 800, 480, false, true); }

src/screens/SleepScreen.h

@@ -0,0 +1,8 @@
+#pragma once
+#include "Screen.h"
+
+class SleepScreen final : public Screen {
+ public:
+  explicit SleepScreen(EpdRenderer* renderer) : Screen(renderer) {}
+  void onEnter() override;
+};