diff --git a/lib/ssd1306/ssd1306.h b/lib/ssd1306/ssd1306.h
--- a/lib/ssd1306/ssd1306.h
+++ b/lib/ssd1306/ssd1306.h
@@ -31,6 +31,8 @@
 //#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);