InfiniTime.git

diff --git a/src/drivers/St7789.cpp b/src/drivers/St7789.cpp
index 035d61c9dde01f11a9f0757cf30ca60779614dc8..48b65acbd2a916bfb43e770daa148330cfcb2c1c 100644
--- a/src/drivers/St7789.cpp
+++ b/src/drivers/St7789.cpp
@@ -27,6 +27,7 @@   DisplayInversionOn();
 #endif
   NormalModeOn();
   SetVdv();
+  PowerControl();
   DisplayOn();
 }
 
@@ -174,6 +175,19 @@ }
 
 void St7789::DisplayOn() {
   WriteCommand(static_cast<uint8_t>(Commands::DisplayOn));
+}
+
+void St7789::PowerControl() {
+  WriteCommand(static_cast<uint8_t>(Commands::PowerControl1));
+  constexpr uint8_t args[] = {
+    0xa4, // Constant
+    0x00, // Lowest possible voltages
+  };
+  WriteData(args, sizeof(args));
+
+  WriteCommand(static_cast<uint8_t>(Commands::PowerControl2));
+  // Lowest possible boost circuit clocks
+  WriteData(0xb3);
 }
 
 void St7789::SetAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1) {




diff --git a/src/drivers/St7789.h b/src/drivers/St7789.h
index e249e0b00403979d9267a50cd20d9b3a23368446..68e9f0582753a4e7cc5f080c1e10da3f74400f53 100644
--- a/src/drivers/St7789.h
+++ b/src/drivers/St7789.h
@@ -54,6 +54,7 @@       void FrameRateNormal();
       void FrameRateLow();
       void DisplayOn();
       void DisplayOff();
+      void PowerControl();
 
       void SetAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1);
       void SetVdv();
@@ -81,6 +82,8 @@         PixelFormat = 0x3a,
         FrameRate = 0xb3,
         VdvSet = 0xc4,
         Command2Enable = 0xdf,
+        PowerControl1 = 0xd0,
+        PowerControl2 = 0xe8,
       };
       void WriteData(uint8_t data);
       void WriteData(const uint8_t* data, size_t size);