added gfx (empty test)

working on gfx module
added a few draw function
gfx still wip
added tamplate for test

oled/gfx.h

@@ -0,0 +1,39 @@
+#include "oled.h"
+
+#ifndef _swap_int16_t
+#define _swap_int16_t(a, b) \
+    {                       \
+        int16_t t = a;      \
+        a = b;              \
+        b = t;              \
+    }
+#endif
+
+#ifndef _diff
+#define _diff(a, b) ((a > b) ? (a - b) : (b - a))
+#endif
+
+typedef enum
+{
+    WHITE,
+    BLACK,
+    NORMAL,
+    INVERSE
+} GFX_Color_t;
+
+typedef enum
+{
+    TOP_RIGHT = 1,
+    BOTTOM_RIGHT = 2,
+    BOTTOM_LEFT = 4,
+    TOP_LEFT = 8
+} CIRC_Corners_t;
+
+void writePixel(OLED_HandleTypeDef *hOled, uint8_t x, uint8_t y, GFX_Color_t color);
+void writeBitmap(OLED_HandleTypeDef *hOled, const uint8_t *bitmap, uint8_t bitmap_width, uint8_t bitmap_height, int8_t pos_x, int8_t pos_y, GFX_Color_t color);
+void writeSlashLine(OLED_HandleTypeDef *hOled, int16_t x0, int16_t y0, int16_t x1, int16_t y1, GFX_Color_t color);
+void writeVerticalLine(OLED_HandleTypeDef *hOled, int16_t x, int16_t y, int16_t height, GFX_Color_t color);
+void writeHorizontalLine(OLED_HandleTypeDef *hOled, int16_t x, int16_t y, int16_t width, GFX_Color_t color);
+void writeRect(OLED_HandleTypeDef *hOled, int16_t x, int16_t y, int16_t width, int16_t height, GFX_Color_t color);
+void writeCircle(OLED_HandleTypeDef *hOled, int16_t x0, int16_t y0, uint8_t radius, GFX_Color_t color);
+void writeQuarterCircle(OLED_HandleTypeDef *hOled, int16_t x0, int16_t y0, uint8_t radius, CIRC_Corners_t corner, GFX_Color_t color);