From f30573a9b0fd33290ce13807714d812086ce1398 Mon Sep 17 00:00:00 2001
From: JF <jf@codingfield.com>
Date: Sat, 15 Feb 2020 15:12:29 +0100
Subject: Add support for hardware assisted vertical scrolling.

---
 src/Components/Gfx/Gfx.cpp |  9 ++++++++-
 src/Components/Gfx/Gfx.h   |  3 +++
 src/drivers/St7789.cpp     | 17 +++++++++++++++++
 src/drivers/St7789.h       |  6 ++++++
 4 files changed, 34 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/Components/Gfx/Gfx.cpp b/src/Components/Gfx/Gfx.cpp
index 0dcb98a6..ed323bc0 100644
--- a/src/Components/Gfx/Gfx.cpp
+++ b/src/Components/Gfx/Gfx.cpp
@@ -30,7 +30,7 @@ void Gfx::ClearScreen() {
 void Gfx::FillRectangle(uint8_t x, uint8_t y, uint8_t w, uint8_t h, uint16_t color) {
   SetBackgroundColor(color);
 
-  state.remainingIterations = 240 + 1;
+  state.remainingIterations = h;
   state.currentIteration = 0;
   state.busy = true;
   state.action = Action::FillRectangle;
@@ -183,4 +183,11 @@ void Gfx::WaitTransfertFinished() const {
   ulTaskNotifyTake(pdTRUE, 500);
 }
 
+void Gfx::SetScrollArea(uint16_t topFixedLines, uint16_t scrollLines, uint16_t bottomFixedLines) {
+  lcd.VerticalScrollDefinition(topFixedLines, scrollLines, bottomFixedLines);
+}
+
+void Gfx::SetScrollStartLine(uint16_t line) {
+  lcd.VerticalScrollStartAddress(line);
+}
 
diff --git a/src/Components/Gfx/Gfx.h b/src/Components/Gfx/Gfx.h
index f31b13c0..6d1d02fd 100644
--- a/src/Components/Gfx/Gfx.h
+++ b/src/Components/Gfx/Gfx.h
@@ -19,6 +19,9 @@ namespace Pinetime {
         void DrawString(uint8_t x, uint8_t y, uint16_t color, const char* text, const FONT_INFO *p_font, bool wrap);
         void DrawChar(const FONT_INFO *font, uint8_t c, uint8_t *x, uint8_t y, uint16_t color);
         void FillRectangle(uint8_t x, uint8_t y, uint8_t width, uint8_t height, uint16_t color);
+        void SetScrollArea(uint16_t topFixedLines, uint16_t scrollLines, uint16_t bottomFixedLines);
+        void SetScrollStartLine(uint16_t line);
+
 
         void Sleep();
         void Wakeup();
diff --git a/src/drivers/St7789.cpp b/src/drivers/St7789.cpp
index 39595dc9..1de5f5f4 100644
--- a/src/drivers/St7789.cpp
+++ b/src/drivers/St7789.cpp
@@ -120,6 +120,23 @@ void St7789::DisplayOff() {
   nrf_delay_ms(500);
 }
 
+void St7789::VerticalScrollDefinition(uint16_t topFixedLines, uint16_t scrollLines, uint16_t bottomFixedLines) {
+  WriteCommand(static_cast<uint8_t>(Commands::VerticalScrollDefinition));
+  WriteData(topFixedLines >> 8u);
+  WriteData(topFixedLines & 0x00ffu);
+  WriteData(scrollLines >> 8u);
+  WriteData(scrollLines & 0x00ffu);
+  WriteData(bottomFixedLines >> 8u);
+  WriteData(bottomFixedLines & 0x00ffu);
+}
+
+void St7789::VerticalScrollStartAddress(uint16_t line) {
+  WriteCommand(static_cast<uint8_t>(Commands::VerticalScrollStartAddress));
+  WriteData(line >> 8u);
+  WriteData(line & 0x00ffu);
+}
+
+
 void St7789::Uninit() {
 
 }
diff --git a/src/drivers/St7789.h b/src/drivers/St7789.h
index 9ecf9f27..4341e909 100644
--- a/src/drivers/St7789.h
+++ b/src/drivers/St7789.h
@@ -11,6 +11,10 @@ namespace Pinetime {
         void Uninit();
         void DrawPixel(uint16_t x, uint16_t y, uint32_t color);
 
+        void VerticalScrollDefinition(uint16_t topFixedLines, uint16_t scrollLines, uint16_t bottomFixedLines);
+        void VerticalScrollStartAddress(uint16_t line);
+
+
         void BeginDrawBuffer(uint16_t x, uint16_t y, uint16_t width, uint16_t height);
         void NextDrawBuffer(const uint8_t* data, size_t size);
 
@@ -48,6 +52,8 @@ namespace Pinetime {
           RowAddressSet = 0x2b,
           WriteToRam = 0x2c,
           MemoryDataAccessControl = 036,
+          VerticalScrollDefinition = 0x33,
+          VerticalScrollStartAddress = 0x37,
           ColMod = 0x3a,
         };
         void WriteData(uint8_t data);
-- 
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