Add immediate response for usb cable plug in / removal

lib/hal/HalGPIO.cpp

@@ -7,7 +7,14 @@ void HalGPIO::begin() {
   pinMode(UART0_RXD, INPUT);
 }
 
-void HalGPIO::update() { inputMgr.update(); }
+void HalGPIO::update() {
+  inputMgr.update();
+  const bool connected = isUsbConnected();
+  usbStateChanged = (connected != lastUsbConnected);
+  lastUsbConnected = connected;
+}
+
+bool HalGPIO::wasUsbStateChanged() const { return usbStateChanged; }
 
 bool HalGPIO::isPressed(uint8_t buttonIndex) const { return inputMgr.isPressed(buttonIndex); }
 

lib/hal/HalGPIO.h

@@ -23,6 +23,9 @@ class HalGPIO {
   InputManager inputMgr;
 #endif
 
+  bool lastUsbConnected = false;
+  bool usbStateChanged = false;
+
  public:
   HalGPIO() = default;
 
@@ -41,6 +44,9 @@ class HalGPIO {
   // Check if USB is connected
   bool isUsbConnected() const;
 
+  // Returns true once per edge (plug or unplug) since the last update()
+  bool wasUsbStateChanged() const;
+
   enum class WakeupReason { PowerButton, AfterFlash, AfterUSBPower, Other };
 
   WakeupReason getWakeupReason() const;

src/main.cpp

@@ -347,6 +347,11 @@ void loop() {
     powerManager.setPowerSaving(false);  // Restore normal CPU frequency on user activity
   }
 
+  // Refresh the battery icon immediately when USB is plugged or unplugged
+  if (gpio.wasUsbStateChanged()) {
+    activityManager.requestUpdate();
+  }
+
   static bool screenshotButtonsReleased = true;
   if (gpio.isPressed(HalGPIO::BTN_POWER) && gpio.isPressed(HalGPIO::BTN_DOWN)) {
     if (screenshotButtonsReleased) {