Fix low power consumption issues

src/helpers/ui/SSD1306Display.cpp

@@ -18,17 +18,23 @@ bool SSD1306Display::begin() {
 }
 
 void SSD1306Display::turnOn() {
-  display.ssd1306_command(SSD1306_DISPLAYON);
   if (!_isOn) {
-    if (_peripher_power) _peripher_power->claim();
+    if (_peripher_power) {
+        _peripher_power->claim();
+        begin();
+    }
     _isOn = true;
   }
+  display.ssd1306_command(SSD1306_DISPLAYON);
 }
 
 void SSD1306Display::turnOff() {
   display.ssd1306_command(SSD1306_DISPLAYOFF);
   if (_isOn) {
-    if (_peripher_power) _peripher_power->release();
+    if (_peripher_power) {
+      if (PIN_OLED_RESET >= 0) digitalWrite(PIN_OLED_RESET, LOW);
+      _peripher_power->release();
+    }
     _isOn = false;
   }
 }

variants/heltec_v4/platformio.ini

@@ -52,6 +52,7 @@ build_flags =
   -D HELTEC_LORA_V4_OLED
   -D PIN_BOARD_SDA=17
   -D PIN_BOARD_SCL=18
+  -D PIN_OLED_RESET=21
   -D ENV_PIN_SDA=4
   -D ENV_PIN_SCL=3
 build_src_filter= ${Heltec_lora32_v4.build_src_filter}