Add vertical scrolling support in st7789 driver

Demo of vertical scrolling in screen Clock.

src/Components/Gfx/Gfx.cpp

@@ -183,4 +183,12 @@ 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);
+}
+
 

src/Components/Gfx/Gfx.h

@@ -19,6 +19,8 @@ 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();

src/DisplayApp/DisplayApp.cpp

@@ -68,7 +68,7 @@ void DisplayApp::Refresh() {
       break;
     case States::Running:
       RunningState();
-      queueTimeout = 1000;
+      queueTimeout = 1;
       break;
   }
 

src/DisplayApp/Screens/Clock.cpp

@@ -5,7 +5,7 @@
 #include "Clock.h"
 
 using namespace Pinetime::Applications::Screens;
-
+uint16_t line = 0;
 void Clock::Refresh(bool fullRefresh) {
   if(fullRefresh) {
     gfx.FillRectangle(0,0,240,240,0x0000);
@@ -14,8 +14,14 @@ void Clock::Refresh(bool fullRefresh) {
     currentChar[2] = 3;
     currentChar[3] = 4;
     auto dummy = currentDateTime.Get();
+
+    gfx.SetScrollArea(74, 78, 320-(78+74));
+    line = 74;
   }
 
+  gfx.SetScrollStartLine(line);
+  line++;
+  if(line == 78+74) line = 74;
   if (fullRefresh || batteryPercentRemaining.IsUpdated()) {
     char batteryChar[11];
     auto newBatteryValue = batteryPercentRemaining.Get();

src/drivers/St7789.cpp

@@ -120,6 +120,22 @@ 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() {
 
 }

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);
 
@@ -47,7 +51,9 @@ namespace Pinetime {
           ColumnAddressSet = 0x2a,
           RowAddressSet = 0x2b,
           WriteToRam = 0x2c,
-          MemoryDataAccessControl = 036,
+          MemoryDataAccessControl = 0x36,
+          VerticalScrollDefinition = 0x33,
+          VerticalScrollStartAddress = 0x37,
           ColMod = 0x3a,
         };
         void WriteData(uint8_t data);