fix: turn off T-Echo peripherals on deep sleep (#3162)

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

src/Power.cpp

@@ -473,11 +473,6 @@ bool Power::setup()
 
 void Power::shutdown()
 {
-    screen->setOn(false);
-#if defined(USE_EINK) && defined(PIN_EINK_EN)
-    digitalWrite(PIN_EINK_EN, LOW); // power off backlight first
-#endif
-
     LOG_INFO("Shutting down\n");
 
 #ifdef HAS_PMU

src/graphics/EInkDisplay2.cpp

@@ -122,11 +122,6 @@ bool EInkDisplay::connect()
 {
     LOG_INFO("Doing EInk init\n");
 
-#ifdef PIN_EINK_PWR_ON
-    pinMode(PIN_EINK_PWR_ON, OUTPUT);
-    digitalWrite(PIN_EINK_PWR_ON, HIGH); // If we need to assert a pin to power external peripherals
-#endif
-
 #ifdef PIN_EINK_EN
     // backlight power, HIGH is backlight on, LOW is off
     pinMode(PIN_EINK_EN, OUTPUT);

src/graphics/Screen.cpp

@@ -938,6 +938,9 @@ void Screen::doDeepSleep()
     static const int sleepFrameCount = sizeof(sleepFrames) / sizeof(sleepFrames[0]);
     ui->setFrames(sleepFrames, sleepFrameCount);
     ui->update();
+#ifdef PIN_EINK_EN
+    digitalWrite(PIN_EINK_EN, LOW); // power off backlight
+#endif
 #endif
     setOn(false);
 }

src/main.cpp

@@ -219,10 +219,11 @@ void setup()
 
     initDeepSleep();
 
-    // Testing this fix für erratic T-Echo boot behaviour
-#if defined(TTGO_T_ECHO) && defined(PIN_EINK_PWR_ON)
-    pinMode(PIN_EINK_PWR_ON, OUTPUT);
-    digitalWrite(PIN_EINK_PWR_ON, HIGH);
+    // power on peripherals
+#if defined(TTGO_T_ECHO) && defined(PIN_POWER_EN)
+    pinMode(PIN_POWER_EN, OUTPUT);
+    digitalWrite(PIN_POWER_EN, HIGH);
+    digitalWrite(PIN_POWER_EN1, INPUT);
 #endif
 
 #if defined(VEXT_ENABLE_V03)

src/sleep.cpp

@@ -200,6 +200,13 @@ void doDeepSleep(uint32_t msecToWake, bool skipPreflight = false)
 
     nodeDB.saveToDisk();
 
+#ifdef TTGO_T_ECHO
+#ifdef PIN_POWER_EN
+    pinMode(PIN_POWER_EN, INPUT); // power off peripherals
+    pinMode(PIN_POWER_EN1, INPUT_PULLDOWN);
+#endif
+#endif
+
     // Kill GPS power completely (even if previously we just had it in sleep mode)
     if (gps)
         gps->setGPSPower(false, false, 0);