Implement the SPI driver using DMA.

2 files changed, 28 insertions, 8 deletions

diff --git a/src/Components/Gfx/Gfx.cpp b/src/Components/Gfx/Gfx.cpp
index 9e680687..6c19518a 100644
--- a/src/Components/Gfx/Gfx.cpp
+++ b/src/Components/Gfx/Gfx.cpp
@@ -11,11 +11,21 @@ void Gfx::Init() {
 }
 
 void Gfx::ClearScreen() {
-  lcd.FillRectangle(0, 0, width, height, 0x0000);
+  SetBackgroundColor(0x0000);
+  lcd.BeginDrawBuffer(0, 0, width, height);
+  for(int i = 0; i < height; i++) {
+    lcd.NextDrawBuffer(reinterpret_cast<const uint8_t *>(buffer), width * 2);
+  }
+  lcd.EndDrawBuffer();
 }
 
 void Gfx::FillRectangle(uint8_t x, uint8_t y, uint8_t width, uint8_t height, uint16_t color) {
-  lcd.FillRectangle(x, y, width, height, color);
+  SetBackgroundColor(color);
+  lcd.BeginDrawBuffer(0, 0, width, height);
+  for(int i = 0; i < height; i++) {
+    lcd.NextDrawBuffer(reinterpret_cast<const uint8_t *>(buffer), width * 2);
+  }
+  lcd.EndDrawBuffer();
 }
 
 void Gfx::DrawString(uint8_t x, uint8_t y, uint16_t color, const char *text, const FONT_INFO *p_font, bool wrap) {
@@ -70,15 +80,15 @@ void Gfx::DrawChar(const FONT_INFO *font, uint8_t c, uint8_t *x, uint8_t y, uint
   for (uint16_t i = 0; i < font->height; i++) {
     for (uint16_t j = 0; j < bytes_in_line; j++) {
       for (uint8_t k = 0; k < 8; k++) {
-        if ((1 << (7 - k)) &
-            font->data[font->charInfo[char_idx].offset + i * bytes_in_line + j]) {
-          lcd.NextDrawBuffer(reinterpret_cast<uint8_t *>(&color), 2);
+        if ((1 << (7 - k)) & font->data[font->charInfo[char_idx].offset + i * bytes_in_line + j]) {
+            buffer[(j*8)+k] = color;
         }
         else {
-          lcd.NextDrawBuffer(reinterpret_cast<uint8_t *>(&bg), 2);
+          buffer[(j*8)+k] = bg;
         }
       }
     }
+    lcd.NextDrawBuffer(reinterpret_cast<uint8_t *>(&buffer), bytes_in_line*8*2);
   }
   lcd.EndDrawBuffer();
   *x += font->charInfo[char_idx].widthBits + font->spacePixels;
@@ -96,4 +106,10 @@ void Gfx::Wakeup() {
   lcd.Wakeup();
 }
 
+void Gfx::SetBackgroundColor(uint16_t color) {
+  for(int i = 0; i < width; i++) {
+    buffer[i] = color;
+  }
+}
+
 
diff --git a/src/Components/Gfx/Gfx.h b/src/Components/Gfx/Gfx.h
index 9bd07fee..d8728701 100644
--- a/src/Components/Gfx/Gfx.h
+++ b/src/Components/Gfx/Gfx.h
@@ -21,10 +21,14 @@ namespace Pinetime {
         void Wakeup();
 
       private:
+        static constexpr uint8_t width = 240;
+        static constexpr uint8_t height = 240;
+
+        uint16_t buffer[width]; // 1 line buffer
         Drivers::St7789& lcd;
-        const uint8_t width = 240;
-        const uint8_t height = 240;
+
         void pixel_draw(uint8_t x, uint8_t y, uint16_t color);
+        void SetBackgroundColor(uint16_t color);
     };
   }
 }