Added buffered rendering

example.c

@@ -215,6 +215,7 @@ int main(int argc, char** argv) {
         /* Refresh screen */
         //ssd1306Refresh();
         //SSD1306MSDELAY(1000);
+	lcd_redrawBuffer(lcd);
 	sleep(1);
     }
 

main.c

@@ -26,10 +26,12 @@ int main(int argc, char *argv[])
 	printf("Fill display...");
 	printf("blue...");
 	lcd_fillScreen(lcd, 0, 70, 160);
+	lcd_redrawBuffer(lcd);
 	printf("...waiting 1 second...");
 	sleep(1);
 	printf("black...");
 	lcd_fillScreen(lcd, 0, 0, 0);
+	lcd_redrawBuffer(lcd);
 	printf("DONE\n");
 
 	printf("...waiting 1 second...\n");
@@ -43,6 +45,7 @@ int main(int argc, char *argv[])
 				random_color_g(i),
 				random_color_b(i));
 	}
+	lcd_redrawBuffer(lcd);
 	printf("DONE\n");
 
 	printf("...waiting 1 second...\n");
@@ -61,9 +64,12 @@ int main(int argc, char *argv[])
 		for (int p = 0; p < w*h; p++) {
 			lcd_pushPixel(lcd, r * p / (w*h), g * (w*h-p) / (w*h), b);
 		}
+	lcd_redrawBuffer(lcd);
 	}
 	printf("DONE\n");
 
+	return 0; 
+
 	printf("...waiting 1 second...\n");
 	sleep(1);
 
@@ -71,6 +77,7 @@ int main(int argc, char *argv[])
 	lcd_fillScreen(lcd, 0, 0, 0);
 	lcd_fillRect(lcd, 30, 10, 10, 10, 0, 255, 255);
 	lcd_fillRect(lcd, 30, 30, 10, 10, 255, 255, 0);
+	lcd_redrawBuffer(lcd);
 	printf("DONE\n");
 
 	printf("...waiting 1 second...\n");
@@ -81,6 +88,7 @@ int main(int argc, char *argv[])
 	lcd_drawChar(lcd, 10, 90, 'A', 255, 0, 0);
 	lcd_drawText(lcd, 10, 50, "Hello, world!", 0, 255, 0);
 	lcd_drawChar(lcd, 10, 100, 'Z', 0, 0, 255);
+	lcd_redrawBuffer(lcd);
 	printf("DONE\n");
 
 	printf("...waiting 2 seconds...\n");
@@ -92,6 +100,7 @@ int main(int argc, char *argv[])
 			random_color_r(i),
 			random_color_g(i),
 			random_color_b(i));
+	lcd_redrawBuffer(lcd);
 	}
 	printf("DONE\n");
 	

spilcd.h

@@ -76,5 +76,7 @@ void lcd_pushPixel(lcd_t* lcd, uint8 r, uint8 g, uint8 b);
  */
 void lcd_pushPixels(lcd_t* lcd, uint8* pixels, size_t count);
 
+void lcd_redrawBuffer(lcd_t* lcd);
+
 #endif // __SPILCD_H__
 

st7735.c

@@ -28,6 +28,14 @@ struct
 };
 /****************************** END EASY PORT END *****************************/
 
+static uint8 screen_buffer[128 * 160 * 3]; // TODO: make dynamic
+static uint8 screen_window_x1;
+static uint8 screen_window_x2;
+static uint8 screen_window_y1;
+static uint8 screen_window_y2;
+static uint8 screen_cursor_x;
+static uint8 screen_cursor_y;
+
 static lcd_t *activeDisplay;
 
 /*
@@ -54,6 +62,10 @@ static inline void *safeMalloc(size_t size)
 } /* safeMalloc */
 
 
+uint8 lcdhw_setWindow(lcd_t* lcd, uint8 x1, uint8 y1, uint8 x2, uint8 y2);
+void lcdhw_pushPixel(lcd_t* lcd, uint8 r, uint8 g, uint8 b);
+void lcdhw_pushPixels(lcd_t* lcd, uint8* pixels, size_t count);
+
 void lcd_setOrientation(lcd_t* lcd, uint8 orientation);
 void lcd_setGamma(lcd_t* lcd, uint8 state);
 void lcd_pushPixel(lcd_t* lcd, uint8 r, uint8 g, uint8 b);
@@ -158,28 +170,28 @@ void lcd_setOrientation(lcd_t* lcd, uint8 orientation)
 			writeData(0x60); /* MX + MV */
 			activeDisplay->width  = 160;
 			activeDisplay->height = 128;
-			lcd_setWindow(lcd, 0, 0, 159, 127);
+			lcdhw_setWindow(lcd, 0, 0, 159, 127);
 			break;
 
 		case 2:
 			writeData(0xC0); /* MY + MX */
 			activeDisplay->width  = 128;
 			activeDisplay->height = 160;
-			lcd_setWindow(lcd, 0, 0, 127, 159);
+			lcdhw_setWindow(lcd, 0, 0, 127, 159);
 			break;
 
 		case 3:
 			writeData(0xA0); /* MY + MV */
 			activeDisplay->width  = 160;
 			activeDisplay->height = 128;
-			lcd_setWindow(lcd, 0, 0, 159, 127);
+			lcdhw_setWindow(lcd, 0, 0, 159, 127);
 			break;
 
 		default:
 			writeData(0x00); /* None */
 			activeDisplay->width  = 128;
 			activeDisplay->height = 160;
-			lcd_setWindow(lcd, 0, 0, 127, 159);
+			lcdhw_setWindow(lcd, 0, 0, 127, 159);
 			break;
 	}
 } /* lcdst_setOrientation */
@@ -206,7 +218,7 @@ void lcd_setInversion(lcd_t* lcd, uint8 state)
 	writeCommand(state ? 0x21 : 0x20);
 } /* lcdst_setInversion */
 
-uint8 lcd_setWindow(lcd_t* lcd, uint8 x1, uint8 y1, uint8 x2, uint8 y2)
+uint8 lcdhw_setWindow(lcd_t* lcd, uint8 x1, uint8 y1, uint8 x2, uint8 y2)
 {
 	/* Accept: 0 <= x1 <= x2 < activeDisplay->width */
 	if(x2 < x1) return 1;
@@ -241,18 +253,69 @@ void lcd_activateRamWrite(void)
 
 uint8 pixel[3];
 
-inline void lcd_pushPixel(lcd_t* lcd, uint8 r, uint8 g, uint8 b)
+inline void lcdhw_pushPixel(lcd_t* lcd, uint8 r, uint8 g, uint8 b)
 {
 	gpio.digitalWrite(activeDisplay->a0, HIGH);
 	pixel[0] = r;
 	pixel[1] = g;
 	pixel[2] = b;
 	gpio.spiDataRW(activeDisplay->channel, pixel, 3);
-} /* lcdst_pushPx */
+}
 
-void lcd_pushPixels(lcd_t* lcd, uint8* pixels, size_t count)
+void lcdhw_pushPixels(lcd_t* lcd, uint8* pixels, size_t count)
 {
 	gpio.digitalWrite(activeDisplay->a0, HIGH);
 	gpio.spiDataRW(activeDisplay->channel, pixels, count * 3);
 }
 
+uint8 line_buffer[160*3]; // lcd->width or lcd->height
+
+void lcd_redrawBuffer(lcd_t* lcd)
+{
+	for (int i = 0; i < lcd->height; i++) { 
+		memcpy(line_buffer, &screen_buffer[i*lcd->width*3], lcd->width*3);
+		lcdhw_setWindow(lcd, 0, i, lcd->width - 1, i);
+		lcdhw_pushPixels(lcd, line_buffer, lcd->width);
+	}
+}
+
+uint8 lcd_setWindow(lcd_t* lcd, uint8 x1, uint8 y1, uint8 x2, uint8 y2)
+{
+	screen_window_x1 = x1;
+	screen_window_x2 = x2;
+	screen_window_y1 = y1;
+	screen_window_y2 = y2;
+	screen_cursor_x = x1;
+	screen_cursor_y = y1;
+	return 0;
+}
+
+void lcd_pushPixel(lcd_t* lcd, uint8 r, uint8 g, uint8 b)
+{
+	int i = screen_cursor_x
+		+ screen_cursor_y * lcd->width;
+	screen_buffer[i * 3 + 0] = r;
+	screen_buffer[i * 3 + 1] = g;
+	screen_buffer[i * 3 + 2] = b;
+	
+	screen_cursor_x++;
+	if (screen_cursor_x > screen_window_x2) {
+		screen_cursor_x = screen_window_x1;
+		screen_cursor_y++;
+		if (screen_cursor_y > screen_window_y2) {
+			screen_cursor_y = screen_window_y1;
+		}
+	}
+}
+
+void lcd_pushPixels(lcd_t* lcd, uint8* pixels, size_t count)
+{
+	for (int i = 0; i < count; i++) {
+		lcd_pushPixel(lcd,
+			pixels[i * 3 + 0],
+			pixels[i * 3 + 1],
+			pixels[i * 3 + 2]);
+	}
+}
+
+