diff --git a/inc/ssd1306.h b/lib/ssd1306/ssd1306.h
copy from inc/ssd1306.h
copy to lib/ssd1306/ssd1306.h
--- a/inc/ssd1306.h
+++ b/lib/ssd1306/ssd1306.h
@@ -31,11 +31,13 @@
 //#define   SPI_SendByte(data)  SPI_I2S_SendData(SPI1,data)
 //#define   SPI_Wait()       while(!(SPI1->SR&SPI_FLAG_TXE));while(SPI1->SR&SPI_FLAG_BSY);
 
+SPI_HandleTypeDef* spi_get();
+
 void ssd1306_init(void);
-void ssd1306_drawchar(char ascii, unsigned char row, unsigned char xPos);
-void ssd1306_drawcharbig(char ascii, unsigned char row, unsigned char xPos);
-void ssd1306_drawstring(const char *dataPtr, unsigned char row, unsigned char xPos);
-void ssd1306_drawstringbig(const char *dataPtr, unsigned char row, unsigned char xPos);
+void ssd1306_drawchar(unsigned char ascii, unsigned char row, unsigned char xPos);
+void ssd1306_drawcharbig(unsigned char ascii, unsigned char row, unsigned char xPos);
+void ssd1306_drawstring(const unsigned char *dataPtr, unsigned char row, unsigned char xPos);
+void ssd1306_drawstringbig(const unsigned char *dataPtr, unsigned char row, unsigned char xPos);
 void ssd1306_drawlogo();
 void ssd1306_clearscreen();