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);

variants/rak10701/variant.h

@@ -133,10 +133,6 @@ static const uint8_t SCK = PIN_SPI_SCK;
 #define PIN_EINK_SCLK (0 + 3)
 #define PIN_EINK_MOSI (0 + 30) // also called SDI
 
-// Controls power for the eink display - Board power is enabled either by VBUS from USB or the CPU asserting PWR_ON
-// FIXME - I think this is actually just the board power enable - it enables power to the CPU also
-// #define PIN_EINK_PWR_ON (-1)
-
 // #define USE_EINK
 
 // RAKRGB

variants/rak4631/variant.h

@@ -133,10 +133,6 @@ static const uint8_t SCK = PIN_SPI_SCK;
 #define PIN_EINK_SCLK (0 + 3)
 #define PIN_EINK_MOSI (0 + 30) // also called SDI
 
-// Controls power for the eink display - Board power is enabled either by VBUS from USB or the CPU asserting PWR_ON
-// FIXME - I think this is actually just the board power enable - it enables power to the CPU also
-// #define PIN_EINK_PWR_ON (-1)
-
 // #define USE_EINK
 
 // RAKRGB

variants/rak4631_epaper/variant.h

@@ -133,10 +133,6 @@ static const uint8_t SCK = PIN_SPI_SCK;
 #define PIN_EINK_SCLK (0 + 3)
 #define PIN_EINK_MOSI (0 + 30) // also called SDI
 
-// Controls power for the eink display - Board power is enabled either by VBUS from USB or the CPU asserting PWR_ON
-// FIXME - I think this is actually just the board power enable - it enables power to the CPU also
-// #define PIN_EINK_PWR_ON (-1)
-
 #define USE_EINK
 
 // RAKRGB

variants/rak4631_epaper_onrxtx/variant.h

@@ -119,10 +119,6 @@ static const uint8_t SCK = PIN_SPI_SCK;
 #define PIN_EINK_SCLK (0 + 14) // SCL
 #define PIN_EINK_MOSI (0 + 13) // SDA
 
-// Controls power for the eink display - Board power is enabled either by VBUS from USB or the CPU asserting PWR_ON
-// FIXME - I think this is actually just the board power enable - it enables power to the CPU also
-// #define PIN_EINK_PWR_ON (-1)
-
 // RAKRGB
 #define HAS_NCP5623
 

variants/t-echo/variant.h

@@ -156,9 +156,9 @@ External serial flash WP25R1635FZUIL0
 #define PIN_EINK_SCLK (0 + 31)
 #define PIN_EINK_MOSI (0 + 29) // also called SDI
 
-// Controls power for the eink display - Board power is enabled either by VBUS from USB or the CPU asserting PWR_ON
-// FIXME - I think this is actually just the board power enable - it enables power to the CPU also
-#define PIN_EINK_PWR_ON (0 + 12)
+// Controls power for all peripherals (eink + GPS + LoRa + Sensor)
+#define PIN_POWER_EN (0 + 12)
+#define PIN_POWER_EN1 (0 + 13)
 
 #define USE_EINK