diff --git a/ssd1306.h b/ssd1306.h
--- a/ssd1306.h
+++ b/ssd1306.h
@@ -1,55 +1,10 @@
 #ifndef   ssd1306_H
 #define   ssd1306_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);
-extern  const DeviceProp  ssd1306_Prop;
-unsigned long ssd1306_DrawBlock(Pos_t x, Pos_t y, Pos_t cx, Pos_t cy, const unsigned char* data);
-unsigned long ssd1306_IsOn(void);
-unsigned long ssd1306_TurnOff(void);
-unsigned long ssd1306_TurnOn(void);
-unsigned char ssd1306_SetContrast(unsigned char contrast);
-unsigned char ssd1306_GetContrast();
-unsigned char* ssd1306_GetBuffer();
-unsigned long ssd1306_DrawPoint(Pos_t x, Pos_t y, Color_t color);
-void ssd1306_block_write(void);
+void ssd1306_Init(void);
 void ssd1306_DrawChar(char ascii, unsigned char row, unsigned char xPos);
 void ssd1306_DrawString(const char *dataPtr, unsigned char row, unsigned char xPos);
 void ssd1306_drawlogo();
+void ssd1306_clearscreen();
 
 #endif