diff --git a/libraries/oleddrv/font.h b/libraries/oleddrv/font.h
new file mode 100644
--- /dev/null
+++ b/libraries/oleddrv/font.h
@@ -0,0 +1,11 @@
+#ifndef   FONT_H
+#define   FONT_H
+
+typedef unsigned long(*pfnFontDrawChar)(pfnDrawBlock_t DrawBlock,Pos_t x, Pos_t y, unsigned int ch);
+
+unsigned long SongSmall5_DrawChar(pfnDrawBlock_t DrawBlock,Pos_t x, Pos_t y,unsigned int ch);
+
+#define   GetFontTextHeight(pfnFont,ch)    pfnFont(0,0,0,(unsigned char)(ch))
+#define   GetFontTextWidth(pfnFont,ch)     pfnFont(0,1,0,(unsigned char)(ch))
+
+#endif