OLED screen driver based on stm32

This experiment is based on STM32F103ZET6 Single chip microcomputer ,OLED The screen IIC Interface , The MCU pins used are PC8,PC9,OLED The screen shows BMP picture , So you need to prepare one in advance BMP picture ;

unsigned char show1[]=
{
0x01,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0xC0,0x40,0x40,0x40,0x60,0x20,0x20,
0x20,0x20,0x20,0x20,0x20,0x60,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xC0,0x60,0x20,
0x30,0x10,0x18,0x08,0x08,0x04,0x04,0x04,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x06,0x04,0x04,0x0C,0x08,0x90,
0xF0,0x30,0x68,0xCC,0xC6,0x43,0x41,0x40,0x40,0x40,0xC0,0x80,0x80,0x80,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE0,0x38,0x0E,0x01,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x01,0x03,0x02,0x02,0x02,0x02,0x02,0x02,0x06,0x04,0x07,
0x0C,0x08,0x08,0x08,0x10,0x10,0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,
0x02,0x06,0x1C,0xF0,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x07,0x78,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x07,0x38,0xC0,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x0C,0x04,0x04,0x04,0x04,0x0C,0x38,0xE0,
0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x07,0x18,0xE0,0x80,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0xC0,0x30,0x0E,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xE0,0x18,0x0C,0x06,0x02,0x01,
0x01,0x01,0x01,0x01,0x01,0x01,0x03,0xCE,0x78,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x70,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,
0x1F,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x03,
0x0C,0x18,0x30,0x20,0x60,0xC0,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x40,0x20,0x20,0x30,0x10,0x08,
0x0C,0x06,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x38,0x07,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x80,0x80,0x40,0x60,0x30,0x0F,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x07,0x0C,0x18,0x10,0x10,0x10,
0x18,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x03,0x02,0x02,0x06,0x04,0x04,0x04,
0x04,0x04,0x0C,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x04,0x04,
0x04,0x04,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0F,0x08,0x0C,0x04,0x04,0x06,0x02,0x02,0x01,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};

OLED initialization

void OLED_Init()
{
	GPIO_InitTypeDef  GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC, ENABLE);
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9; 
 	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; 	// Push pull output 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;// Speed 50MHz
 	GPIO_Init(GPIOC, &GPIO_InitStructure);	 
 	GPIO_SetBits(GPIOC,GPIO_Pin_8|GPIO_Pin_9);	// Power up ?
	delay_ms(500);
	
// Corresponding OLED  Initialization of the basic register of the screen , Corresponding screen model .				  
	OLED_WR_Byte(0xAE,OLED_CMD); // Turn off display 
	OLED_WR_Byte(0xD5,OLED_CMD); // Set the clock division factor , Oscillation frequency 
	OLED_WR_Byte(80,OLED_CMD);   //[3:0], Division factor ;[7:4], Oscillation frequency 
	OLED_WR_Byte(0xA8,OLED_CMD); // Set the number of drive paths 
	OLED_WR_Byte(0X3F,OLED_CMD); // Default 0X3F(1/64) 
	OLED_WR_Byte(0xD3,OLED_CMD); // Set the display offset 
	OLED_WR_Byte(0X00,OLED_CMD); // The default is 0

	OLED_WR_Byte(0x40,OLED_CMD); // Set display start line  [5:0], Row number .
													    
	OLED_WR_Byte(0x8D,OLED_CMD); // Charge pump settings 
	OLED_WR_Byte(0x14,OLED_CMD); //bit2, Turn on / close 
	OLED_WR_Byte(0x20,OLED_CMD); // Set memory address mode 
	OLED_WR_Byte(0x02,OLED_CMD); //[1:0],00, Column address mode ;01, Line address mode ;10, Page address mode ; Default 10;
	OLED_WR_Byte(0xA1,OLED_CMD); // Segment redefinition settings ,bit0:0,0->0;1,0->127;
	OLED_WR_Byte(0xC0,OLED_CMD); // Set up COM Scanning direction ;bit3:0, Common mode ;1, Redefining patterns  COM[N-1]->COM0;N: Number of driving paths 
	OLED_WR_Byte(0xDA,OLED_CMD); // Set up COM Hardware pin configuration 
	OLED_WR_Byte(0x12,OLED_CMD); //[5:4] To configure 
		 
	OLED_WR_Byte(0x81,OLED_CMD); // Contrast settings 
	OLED_WR_Byte(0xEF,OLED_CMD); //1~255; Default 0X7F ( Brightness setting , The bigger, the brighter )
	OLED_WR_Byte(0xD9,OLED_CMD); // Set precharge cycle 
	OLED_WR_Byte(0xf1,OLED_CMD); //[3:0],PHASE 1;[7:4],PHASE 2;
	OLED_WR_Byte(0xDB,OLED_CMD); // Set up VCOMH  Voltage multiplier 
	OLED_WR_Byte(0x30,OLED_CMD); //[6:4] 000,0.65*vcc;001,0.77*vcc;011,0.83*vcc;

	OLED_WR_Byte(0xA4,OLED_CMD); // Global display on ;bit0:1, Turn on ;0, close ;( hang / Black screen )
	OLED_WR_Byte(0xA6,OLED_CMD); // Set display mode ;bit0:1, Inverse display ;0, Normal display 	    						   
	OLED_WR_Byte(0xAF,OLED_CMD); // Turn on the display 	 
	OLED_Clear();
	OLED_Refresh_Gram();
}

This screen is based on IIC Interface , Therefore, it is necessary to include IIC Contents of the agreement ： Start signal OLED_IICStart() And stop signal OLED_IICStop().

void OLED_IICStart()
{
   OLED_SCL = 1;                
   OLED_SDA = 1;
   OLED_SDA = 0;
   OLED_SCL = 0;
}

void OLED_IICStop()
{
   OLED_SCL = 0;
   OLED_SDA = 0;
   OLED_SCL = 1;
   OLED_SDA = 1;
}

Writing data ： Write a byte

void OLED_Byte(u8 dat)// Write a byte 
{
	 u8 i;	 
	 for(i=0;i<8;i++)
	 {
			if(dat & 0x80)
							OLED_SDA=1;
			else
							OLED_SDA=0;
			OLED_SCL=1;
			OLED_SCL=0;
			dat<<=1;
	 }
	 OLED_SDA=1;
	 OLED_SCL=1;
	 OLED_SCL=0;	 
}

void OLED_WR_Byte(u8 dat,u8 cmd)// Write data or write commands   cmd Control command or data 
{
   if(cmd == 1)
	 {
	    OLED_IICStart();
		  OLED_Byte(0X78);
		  OLED_Byte(0X40);
		  OLED_Byte(dat);
		  OLED_IICStop();
	 }
	 else
	 {
	    OLED_IICStart();
		  OLED_Byte(0X78);
		  OLED_Byte(0X00);
		  OLED_Byte(dat);
		  OLED_IICStop();
	 }
}

to update OLED The screen

// Update the memory to LCD		 
void OLED_Refresh_Gram(void)
{
	u8 i,n;		    
	for(i=0;i<8;i++)  
	{  
		OLED_WR_Byte (0xb0+i,OLED_CMD);    // Set page address （0~7）
		OLED_WR_Byte (0x00,OLED_CMD);      // Set the display position — List the addresses 
		OLED_WR_Byte (0x10,OLED_CMD);      // Set the display position — Column address    
		for(n=0;n<128;n++)OLED_WR_Byte(OLED_GRAM[n][i],OLED_DATA); 
	}   
}

Clear the screen

// Screen clearing function , Clear the screen , The whole screen is black ! It's the same as not lit !!!	  
void OLED_Clear(void)  
{  
	u8 i,n;		    
	for(i=0;i<8;i++)  
	{    
		for(n=0;n<128;n++)
		{
			OLED_GRAM[n][i]=0;
		}
	}
	OLED_Refresh_Gram();// Update display  
}

Show BMP Picture function

// Show BMP picture 128×64
// Starting point coordinates (x,y),x The scope of the 0～127,y For the scope of the page 0～7
void OLED_DrawBMP(u8 x0, u8 y0,u8 x1, u8 y1,u8 BMP[])
{ 	
 	u16 j=0;
 	u8 x,y;
  
	for(y=y0;y<y1;y++)
	{
		OLED_WR_Byte(0xb0+y,OLED_CMD);
	  OLED_WR_Byte(0x00,OLED_CMD);
	  OLED_WR_Byte(0x10,OLED_CMD);
    	for(x=x0;x<x1;x++)
	    {      
	    	OLED_WR_Byte(BMP[j++],OLED_DATA);	    	
	    }
	}
}

The main function

int main()
{
	delay_init();
	OLED_Init(); 
	OLED_Clear();
	OLED_DrawBMP(0,0,128,8,show1);
	delay_ms(1000);
	while(1);;		
}