aod: lower voltage going to the display

1 files changed, 14 insertions, 0 deletions

diff --git a/src/drivers/St7789.cpp b/src/drivers/St7789.cpp
index 035d61c9..48b65acb 100644
--- a/src/drivers/St7789.cpp
+++ b/src/drivers/St7789.cpp
@@ -27,6 +27,7 @@ void St7789::Init() {
 #endif
   NormalModeOn();
   SetVdv();
+  PowerControl();
   DisplayOn();
 }
 
@@ -176,6 +177,19 @@ 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) {
   WriteCommand(static_cast<uint8_t>(Commands::ColumnAddressSet));
   uint8_t colArgs[] = {