From 84c0cd106c8eba2757c2059231970dfb3cd3e868 Mon Sep 17 00:00:00 2001
From: Daniel Ansorregui <mailszeros@gmail.com>
Date: Tue, 26 Dec 2023 16:46:53 +0000
Subject: [PATCH] Set boosters configuration

* Reduce the phase on times from 40ms->10ms
* Increase the driving strength, this reduces
  a little the power usage as well
* Reduces 220ms the display update
  -80ms the power on of the display
  -140ms the display partial update
- Note: This may have side effects, but I saw none
  tested on Watchy v1.0, display should be same on
  other Watchy boards
---
 src/Display.cpp | 12 ++++++++++++
 src/Display.h   |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/src/Display.cpp b/src/Display.cpp
index ad61249..25f311f 100644
--- a/src/Display.cpp
+++ b/src/Display.cpp
@@ -382,6 +382,18 @@ void WatchyDisplay::_InitDisplay()
   _transfer(0xC7);
   _transfer(0x00);
   _transfer(0x00);
+
+  if (reduceBoosterTime) {
+    // SSD1675B controller datasheet
+    _transferCommand(0x0C); // BOOSTER_SOFT_START_CONTROL
+    // Set the driving strength of GDR for all phases to maximun 0b111 -> 0xF
+    // Set the minimum off time of GDR to minimum 0x4 (values below sould be same)
+    _transfer(0xF4); // Phase1 Default value 0x8B
+    _transfer(0xF4); // Phase2 Default value 0x9C
+    _transfer(0xF4); // Phase3 Default value 0x96
+    _transfer(0x00); // Duration of phases, Default 0xF = 0b00 11 11 (40ms Phase 1/2, 10ms Phase 3)
+  }
+
   _transferCommand(0x3C); // BorderWavefrom
   _transfer(darkBorder ? 0x02 : 0x05);
   _transferCommand(0x18); // Read built-in temperature sensor
diff --git a/src/Display.h b/src/Display.h
index 0799863..5c1ebf3 100644
--- a/src/Display.h
+++ b/src/Display.h
@@ -71,6 +71,8 @@ class WatchyDisplay : public GxEPD2_EPD
     void hibernate(); // turns powerOff() and sets controller to deep sleep for minimum power use, ONLY if wakeable by RST (rst >= 0)
 
     bool darkBorder = false; // adds a dark border outside the normal screen area
+
+    static constexpr bool reduceBoosterTime = true; // Saves ~200ms
   private:
     void _writeScreenBuffer(uint8_t command, uint8_t value);
     void _writeImage(uint8_t command, const uint8_t bitmap[], int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false);