From 1c4436186089d031dfa98df18403026c19c9be11 Mon Sep 17 00:00:00 2001
From: ViezeVingertjes <michael.overhorst@gmail.com>
Date: Fri, 19 Dec 2025 08:07:42 +0100
Subject: [PATCH] Add T-Echo hibernation with e-ink clear and peripheral
 shutdown

---
 examples/companion_radio/ui-new/UITask.cpp |  6 ++++++
 src/helpers/ui/GxEPDDisplay.cpp            |  8 +++++++
 src/helpers/ui/GxEPDDisplay.h              |  1 +
 variants/lilygo_techo/TechoBoard.h         | 25 ++++++++++++++++++++++
 4 files changed, 40 insertions(+)

diff --git a/examples/companion_radio/ui-new/UITask.cpp b/examples/companion_radio/ui-new/UITask.cpp
index 29cc59d33..fbdc99b16 100644
--- a/examples/companion_radio/ui-new/UITask.cpp
+++ b/examples/companion_radio/ui-new/UITask.cpp
@@ -688,7 +688,13 @@ void UITask::shutdown(bool restart){
   if (restart) {
     _board->reboot();
   } else {
+    delay(2000);
+    #ifdef DISPLAY_CLASS
+    extern DISPLAY_CLASS display;
+    display.hibernate();
+    #else
     _display->turnOff();
+    #endif
     radio_driver.powerOff();
     _board->powerOff();
   }
diff --git a/src/helpers/ui/GxEPDDisplay.cpp b/src/helpers/ui/GxEPDDisplay.cpp
index ad47754bf..a33631554 100644
--- a/src/helpers/ui/GxEPDDisplay.cpp
+++ b/src/helpers/ui/GxEPDDisplay.cpp
@@ -55,6 +55,14 @@ void GxEPDDisplay::turnOff() {
   _isOn = false;
 }
 
+void GxEPDDisplay::hibernate() {
+  display.fillScreen(GxEPD_BLACK);
+  display.display(false);
+  display.fillScreen(GxEPD_WHITE);
+  display.display(false);
+  display.hibernate();
+}
+
 void GxEPDDisplay::clear() {
   display.fillScreen(GxEPD_WHITE);
   display.setTextColor(GxEPD_BLACK);
diff --git a/src/helpers/ui/GxEPDDisplay.h b/src/helpers/ui/GxEPDDisplay.h
index 1a04cc246..246a1ff4f 100644
--- a/src/helpers/ui/GxEPDDisplay.h
+++ b/src/helpers/ui/GxEPDDisplay.h
@@ -49,6 +49,7 @@ class GxEPDDisplay : public DisplayDriver {
   bool isOn() override {return _isOn;};
   void turnOn() override;
   void turnOff() override;
+  void hibernate();
   void clear() override;
   void startFrame(Color bkg = DARK) override;
   void setTextSize(int sz) override;
diff --git a/variants/lilygo_techo/TechoBoard.h b/variants/lilygo_techo/TechoBoard.h
index c9bdc229b..f6f3b94e6 100644
--- a/variants/lilygo_techo/TechoBoard.h
+++ b/variants/lilygo_techo/TechoBoard.h
@@ -2,6 +2,7 @@
 
 #include <MeshCore.h>
 #include <Arduino.h>
+#include <Wire.h>
 #include <helpers/NRF52Board.h>
 
 // built-ins
@@ -26,18 +27,42 @@ class TechoBoard : public NRF52BoardOTA {
   void powerOff() override {
     #ifdef LED_RED
     digitalWrite(LED_RED, HIGH);
+    pinMode(LED_RED, INPUT_PULLUP);
     #endif
     #ifdef LED_GREEN
     digitalWrite(LED_GREEN, HIGH);
+    pinMode(LED_GREEN, INPUT_PULLUP);
     #endif
     #ifdef LED_BLUE
     digitalWrite(LED_BLUE, HIGH);
+    pinMode(LED_BLUE, INPUT_PULLUP);
     #endif
     #ifdef DISP_BACKLIGHT
     digitalWrite(DISP_BACKLIGHT, LOW);
+    pinMode(DISP_BACKLIGHT, INPUT_PULLDOWN);
+    #endif
+    #ifdef GPS_EN
+    digitalWrite(GPS_EN, LOW);
+    pinMode(GPS_EN, INPUT_PULLDOWN);
+    #endif
+    #ifdef PIN_GPS_RESET
+    digitalWrite(PIN_GPS_RESET, LOW);
+    pinMode(PIN_GPS_RESET, INPUT_PULLDOWN);
+    #endif
+    Wire.end();
+    #ifdef PIN_WIRE_SDA
+    pinMode(PIN_WIRE_SDA, INPUT_PULLUP);
+    #endif
+    #ifdef PIN_WIRE_SCL
+    pinMode(PIN_WIRE_SCL, INPUT_PULLUP);
+    #endif
+    #ifdef SX126X_POWER_EN
+    digitalWrite(SX126X_POWER_EN, LOW);
+    pinMode(SX126X_POWER_EN, INPUT);
     #endif
     #ifdef PIN_PWR_EN
     digitalWrite(PIN_PWR_EN, LOW);
+    pinMode(PIN_PWR_EN, INPUT);
     #endif
     sd_power_system_off();
   }