diff --git a/ssd1306.h b/ssd1306.h
--- a/ssd1306.h
+++ b/ssd1306.h
@@ -1,6 +1,40 @@
 #ifndef   ssd1306_H
 #define   ssd1306_H
-#include "DrawText.h"
+
+typedef unsigned long Pos_t;
+typedef unsigned long Size_t;
+typedef unsigned long Color_t;
+
+typedef   unsigned long  (*pfnDrawBlock_t)(
+  Pos_t x,
+  Pos_t y,
+  Pos_t cx,
+  Pos_t cy,
+  const unsigned char* data);
+typedef   unsigned long  (*pfnDrawPoint_t)(Pos_t x, Pos_t y, Color_t color);
+
+
+typedef unsigned long(*pfnFontDrawChar)(pfnDrawBlock_t DrawBlock,Pos_t x, Pos_t y, unsigned int ch);
+
+
+
+
+typedef  struct _DeviceProp
+{
+  pfnDrawBlock_t    pfnDrawBlok;
+  pfnDrawPoint_t    pfnDrawPoint;
+  Size_t            xPixel;
+  Size_t            yPixel;
+}DeviceProp;
+
+typedef  struct  _Device
+{
+  const DeviceProp*   pDevProp;
+  pfnFontDrawChar     pfnFont;
+  Pos_t               curX;
+  Pos_t               curY;
+}Device;
+
 
 void  ssd1306_Init(void);
 void  StartPageTransfer(void);