diff --git a/ssd1306.c b/ssd1306.c
--- a/ssd1306.c
+++ b/ssd1306.c
@@ -2,7 +2,7 @@
 #include "ssd1306.h"
 
 // Write command to OLED
-void WriteCommand(unsigned char command)
+static void WriteCommand(unsigned char command)
 {
   SSD_CS_Low();
   SSD_A0_Low();
@@ -11,7 +11,7 @@ void WriteCommand(unsigned char command)
 }
 
 // Write data to OLED
-void WriteData(unsigned char data)
+static void WriteData(unsigned char data)
 {
   SSD_CS_Low();
   SSD_A0_High();
@@ -20,7 +20,7 @@ void WriteData(unsigned char data)
 }
 
 // Initialize OLED
-void ssd1306_Init(void)
+void ssd1306_init(void)
 {
 
   /* Generate a reset */
@@ -179,13 +179,13 @@ static const char fontData[][5] =
 };
 
 
-void setStartPage(unsigned char d)
+static void setStartPage(unsigned char d)
 {
     WriteCommand(0xB0|d);       // Set Page Start Address for Page Addressing Mode
                                 // Default => 0xB0 (0x00)
 }
 /* Below are functions used to configure the OLED */
-void setStartColumn(unsigned char d)
+static void setStartColumn(unsigned char d)
 {
     WriteCommand(0x00+d%16);    // Set Lower Column Start Address for Page Addressing Mode
     WriteCommand(0x10+d/16);    // Set Higher Column Start Address for Page Addressing Mode
@@ -259,7 +259,7 @@ void ssd1306_drawlogo()
 }
 
 /* Print a single character from font.cpp */
-void ssd1306_DrawChar(char ascii, unsigned char row, unsigned char xPos)
+void ssd1306_drawchar(char ascii, unsigned char row, unsigned char xPos)
 {
     char *srcPointer = -1;
     unsigned char i;
@@ -277,7 +277,7 @@ void ssd1306_DrawChar(char ascii, unsign
     WriteData(0x00);
 }
 
-void ssd1306_DrawCharBig(char ascii, unsigned char row, unsigned char xPos)
+void ssd1306_drawcharbig(char ascii, unsigned char row, unsigned char xPos)
 {
     char *srcPointer = -1;
     unsigned char i;
@@ -340,16 +340,16 @@ void ssd1306_DrawCharBig(char ascii, uns
  
 }
 
-void ssd1306_DrawString(const char *dataPtr, unsigned char row, unsigned char xPos)
+void ssd1306_drawstring(const char *dataPtr, unsigned char row, unsigned char xPos)
 {
     char *srcPointer;
 
     srcPointer = (char*)dataPtr;
-    ssd1306_DrawChar(' ',row,xPos); // NBSP must be written first before the string start
+    ssd1306_drawchar(' ',row,xPos); // NBSP must be written first before the string start
 
     while(1)
     {
-        ssd1306_DrawChar(*srcPointer,row,xPos);
+        ssd1306_drawchar(*srcPointer,row,xPos);
         srcPointer++;
         xPos+=6;
         if(*srcPointer == 0) break;
@@ -357,16 +357,16 @@ void ssd1306_DrawString(const char *data
 }
 
 
-void ssd1306_DrawStringBig(const char *dataPtr, unsigned char row, unsigned char xPos)
+void ssd1306_drawstringbig(const char *dataPtr, unsigned char row, unsigned char xPos)
 {
     char *srcPointer;
 
     srcPointer = (char*)dataPtr;
-    ssd1306_DrawCharBig(' ',row,xPos); // NBSP must be written first before the string start
+    ssd1306_drawcharbig(' ',row,xPos); // NBSP must be written first before the string start
 
     while(1)
     {
-        ssd1306_DrawCharBig(*srcPointer,row,xPos);
+        ssd1306_drawcharbig(*srcPointer,row,xPos);
         srcPointer++;
         xPos+=12;
         if(*srcPointer == 0) break;