make esp32 deepsleep button wakeup functional again (#2854)

* make deepsleep button wakeup functional again

* Remove unused var

* Cleanup comment

* suppress screen wake on button

* add resume screen

* trunk fmt

* added missing #ifdef

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/PowerFSM.cpp

@@ -348,10 +348,8 @@ void PowerFSM_setup()
                                   getConfiguredOrDefaultMs(config.display.screen_on_secs, default_screen_on_secs), NULL,
                                   "Screen-on timeout");
 
+// We never enter light-sleep or NB states on NRF52 (because the CPU uses so little power normally)
 #ifdef ARCH_ESP32
-    State *lowPowerState = &stateLS;
-    // We never enter light-sleep or NB states on NRF52 (because the CPU uses so little power normally)
-
     // See: https://github.com/meshtastic/firmware/issues/1071
     if (isRouter || config.power.is_power_saving) {
         powerFSM.add_timed_transition(&stateNB, &stateLS,

src/graphics/Screen.cpp

@@ -164,11 +164,28 @@ static void drawIconScreen(const char *upperMsg, OLEDDisplay *display, OLEDDispl
     // FIXME - draw serial # somewhere?
 }
 
+#ifdef ARCH_ESP32
+static void drawFrameResume(OLEDDisplay *display, OLEDDisplayUiState *state, int16_t x, int16_t y)
+{
+    uint16_t x_offset = display->width() / 2;
+    display->setTextAlignment(TEXT_ALIGN_CENTER);
+    display->setFont(FONT_MEDIUM);
+    display->drawString(x_offset + x, 26 + y, "Resuming...");
+}
+#endif
+
 static void drawBootScreen(OLEDDisplay *display, OLEDDisplayUiState *state, int16_t x, int16_t y)
 {
+#ifdef ARCH_ESP32
+    if (wakeCause == ESP_SLEEP_WAKEUP_TIMER || wakeCause == ESP_SLEEP_WAKEUP_EXT1) {
+        drawFrameResume(display, state, x, y);
+    } else
+#endif
+    {
         // Draw region in upper left
         const char *region = myRegion ? myRegion->name : NULL;
         drawIconScreen(region, display, state, x, y);
+    }
 }
 
 static void drawOEMIconScreen(const char *upperMsg, OLEDDisplay *display, OLEDDisplayUiState *state, int16_t x, int16_t y)

src/platform/esp32/main-esp32.cpp

@@ -195,6 +195,24 @@ void cpuDeepSleep(uint32_t msecToWake)
 
         // FIXME, disable internal rtc pullups/pulldowns on the non isolated pins. for inputs that we aren't using
         // to detect wake and in normal operation the external part drives them hard.
+#ifdef BUTTON_PIN
+        // Only GPIOs which are have RTC functionality can be used in this bit map: 0,2,4,12-15,25-27,32-39.
+#if SOC_RTCIO_HOLD_SUPPORTED
+    uint64_t gpioMask = (1ULL << (config.device.button_gpio ? config.device.button_gpio : BUTTON_PIN));
+#endif
+
+#ifdef BUTTON_NEED_PULLUP
+    gpio_pullup_en((gpio_num_t)BUTTON_PIN);
+#endif
+
+    // Not needed because both of the current boards have external pullups
+    // FIXME change polarity in hw so we can wake on ANY_HIGH instead - that would allow us to use all three buttons (instead of
+    // just the first) gpio_pullup_en((gpio_num_t)BUTTON_PIN);
+
+#if SOC_PM_SUPPORT_EXT_WAKEUP
+    esp_sleep_enable_ext1_wakeup(gpioMask, ESP_EXT1_WAKEUP_ALL_LOW);
+#endif
+#endif
 
     // We want RTC peripherals to stay on
     esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON);

src/sleep.cpp

@@ -95,7 +95,29 @@ void initDeepSleep()
 {
 #ifdef ARCH_ESP32
     bootCount++;
+    const char *reason;
     wakeCause = esp_sleep_get_wakeup_cause();
+
+    switch (wakeCause) {
+    case ESP_SLEEP_WAKEUP_EXT0:
+        reason = "ext0 RTC_IO";
+        break;
+    case ESP_SLEEP_WAKEUP_EXT1:
+        reason = "ext1 RTC_CNTL";
+        break;
+    case ESP_SLEEP_WAKEUP_TIMER:
+        reason = "timer";
+        break;
+    case ESP_SLEEP_WAKEUP_TOUCHPAD:
+        reason = "touchpad";
+        break;
+    case ESP_SLEEP_WAKEUP_ULP:
+        reason = "ULP program";
+        break;
+    default:
+        reason = "reset";
+        break;
+    }
     /*
       Not using yet because we are using wake on all buttons being low
 
@@ -106,7 +128,6 @@ void initDeepSleep()
 
 #ifdef DEBUG_PORT
     // If we booted because our timer ran out or the user pressed reset, send those as fake events
-    const char *reason = "reset"; // our best guess
     RESET_REASON hwReason = rtc_get_reset_reason(0);
 
     if (hwReason == RTCWDT_BROWN_OUT_RESET)
@@ -118,9 +139,6 @@ void initDeepSleep()
     if (hwReason == TG1WDT_SYS_RESET)
         reason = "intWatchdog";
 
-    if (wakeCause == ESP_SLEEP_WAKEUP_TIMER)
-        reason = "timeout";
-
     LOG_INFO("Booted, wake cause %d (boot count %d), reset_reason=%s\n", wakeCause, bootCount, reason);
 #endif
 #endif