Additional checks

lib/hal/HalGPIO.cpp

@@ -240,7 +240,13 @@ void HalGPIO::waitForStablePowerRelease() {
     delay(10);
   }
   LOG_DBG("GPIO", "Power button stable-released after %lu ms", millis() - waitStart);
-  // Re-sync the InputManager so its debounced state matches reality
+  // Flush the InputManager debounced state to match reality.
+  // A single update() is insufficient: if lastState was stale ("pressed"), the first
+  // call resets the debounce timer but cannot update currentState until a second call
+  // arrives after DEBOUNCE_DELAY (5 ms).  Without this, isPressed() / getHeldTime()
+  // would carry stale values into the next loop() iteration.
+  inputMgr.update();
+  delay(10);  // > InputManager DEBOUNCE_DELAY (5 ms)
   inputMgr.update();
 }
 

lib/hal/HalPowerManager.cpp

@@ -61,9 +61,11 @@ void HalPowerManager::setPowerSaving(bool enabled) {
 }
 
 void HalPowerManager::startDeepSleep(HalGPIO& gpio, bool keepClockAlive) const {
-  LOG_DBG("PWR", "startDeepSleep: waiting for power button release (isPressed=%d, rawPin=%d, keepClock=%d)",
-          gpio.isPressed(HalGPIO::BTN_POWER), digitalRead(InputManager::POWER_BUTTON_PIN) == LOW, keepClockAlive);
-  gpio.waitForStablePowerRelease();
+  LOG_DBG("PWR", "startDeepSleep: isPressed=%d, rawPin=%d, keepClock=%d", gpio.isPressed(HalGPIO::BTN_POWER),
+          digitalRead(InputManager::POWER_BUTTON_PIN) == LOW, keepClockAlive);
+  // Perform all hardware preparation immediately (while the button may still be held)
+  // so the user gets instant visual feedback (display already off). Only block for
+  // button release at the very end, right before entering sleep.
   // GPIO13 is connected to the battery latch MOSFET.
   // When keepClockAlive is false (default): GPIO13 goes LOW, the MCU is
   // completely powered off during sleep (including the LP timer / RTC memory).
@@ -82,16 +84,17 @@ void HalPowerManager::startDeepSleep(HalGPIO& gpio, bool keepClockAlive) const {
   gpio_deep_sleep_hold_en();
   gpio_hold_en(GPIO_SPIWP);
   pinMode(InputManager::POWER_BUTTON_PIN, INPUT_PULLUP);
+
+  // Now wait for the power button to be fully released before arming the wakeup
+  // trigger and entering sleep — prevents immediate re-wake from a held button.
+  gpio.waitForStablePowerRelease();
+
   // Arm the wakeup trigger *after* the button is released
   // Note: when keepClockAlive is false, this is only useful for waking up on USB power. On battery, the MCU will be
   // completely powered off, so the power button is hard-wired to briefly provide power to the MCU, waking it up
   // regardless of the wakeup source configuration.
   // When keepClockAlive is true, this is the actual wakeup mechanism since the MCU stays powered.
   esp_deep_sleep_enable_gpio_wakeup(1ULL << InputManager::POWER_BUTTON_PIN, ESP_GPIO_WAKEUP_GPIO_LOW);
-  // Final check: is the raw pin still LOW (button still physically pressed)?
-  if (digitalRead(InputManager::POWER_BUTTON_PIN) == LOW) {
-    LOG_DBG("PWR", "startDeepSleep: WARNING raw pin still LOW after release wait — may wake immediately!");
-  }
   LOG_DBG("PWR", "startDeepSleep: entering deep sleep now");
   // Enter Deep Sleep
   esp_deep_sleep_start();

src/main.cpp

@@ -334,14 +334,16 @@ void loop() {
     return;
   }
 
-  static bool powerHoldLogged = false;
-  if (gpio.isPressed(HalGPIO::BTN_POWER)) {
-    const unsigned long heldTime = gpio.getHeldTime();
-    if (!powerHoldLogged) {
-      LOG_DBG("MAIN", "loop: power button pressed, heldTime=%lu ms, required=%u ms, rawPin=%d", heldTime,
-              SETTINGS.getPowerButtonDuration(), digitalRead(InputManager::POWER_BUTTON_PIN) == LOW);
-      powerHoldLogged = true;
-    }
+  // Track power button hold for sleep.  We require a fresh press edge (wasPressed)
+  // before starting to measure hold time, so that a hold carried over from boot
+  // (wake-up press) is never misinterpreted as a "go to sleep" press.
+  static unsigned long powerHoldStart = 0;
+  if (gpio.wasPressed(HalGPIO::BTN_POWER)) {
+    powerHoldStart = millis();
+    LOG_DBG("MAIN", "loop: power button press detected (fresh edge)");
+  }
+  if (gpio.isPressed(HalGPIO::BTN_POWER) && powerHoldStart > 0) {
+    const unsigned long heldTime = millis() - powerHoldStart;
     if (heldTime > SETTINGS.getPowerButtonDuration()) {
       // If the screenshot combination is potentially being pressed, don't sleep
       if (gpio.isPressed(HalGPIO::BTN_DOWN)) {
@@ -349,13 +351,13 @@ void loop() {
       }
       LOG_DBG("MAIN", "loop: power button held for %lu ms (> %u ms), entering deep sleep", heldTime,
               SETTINGS.getPowerButtonDuration());
-      powerHoldLogged = false;
       enterDeepSleep();
       // This should never be hit as `enterDeepSleep` calls esp_deep_sleep_start
       return;
     }
-  } else {
-    powerHoldLogged = false;
+  }
+  if (!gpio.isPressed(HalGPIO::BTN_POWER)) {
+    powerHoldStart = 0;
   }
 
   // Refresh the battery icon when USB is plugged or unplugged.