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/drivers/St7789.cpp | 17 +++++++++++++++++
 src/drivers/St7789.h   |  6 ++++++
 2 files changed, 23 insertions(+)

(limited to 'src/drivers')

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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