STM32 OLED屏（I2C接口）显示

GDDRAM存储显示数据，大小为128x64bits.RAM从PAGE0~PAGE7.
每页内1个SEG对于一个Byte一页有128个数据Byte组成。10241024Byte

从下图可以看出SEG与COM的关系
整个画面有8页，每页有8页COM，128个SEG

涉及到一些配置寄存器，需要查看手册。手册中有几组寄存器

有三种模式设置，例如：

	OLED_WriteC(0X20);	// 设置模式
	OLED_WriteC(0X00);	// 设置值（水平寻址模式 ）

页寻址、A[1:0]=10

水平寻址、A[1:0]=00

垂直寻址 A[1:0]=01

这段话的意思是，SA0 提供可扩展的从机地址，通过SA0(D/C#)脚的上拉和下拉来设置从机地址，拉高则为1，即 0111101；拉低则为0，即0111100
最后一个是读写R/W

I2C地址为0x78

I2C收发数据开始和结束时序

IIC写入时序如下所示：

• 主机先发起开始（START）信号(SDA从高到底，SCL从底到高)，

• 然后发送1byte首字节，包括从机地址(7位)和读写数据位(1位，最低位，0为写模式)，

• 驱动器识别从机地址为本机地址之后，将会发出 应答信号(ACK)

• 主机收到从机的应答信号之后，随后传输命令或者数据。一个控制字节主要由CO 和 D/C# 位后面再加上六个0组成的。

• 接受每一个控制字节或者数据字节都要产生ACK信号

• 传输完毕之后主机发出结束（STOP）信号,SDA 从低到高 SCL保持高

• I2C配置，配置SCL、SDL的GPIO
  SCL <—>PB6
  SDA <—>PB7
• 根据手册配置OLED

#define OLED_I2C I2C1
#define OLED_I2C_CLK RCC_APB1Periph_I2C1
#define OLED_I2C_CLK_INIT RCC_APB1PeriphClockCmd

#define OLED_I2C_SCL_PIN GPIO_Pin_6 
#define OLED_I2C_SCL_GPIO_PORT GPIOB 
#define OLED_I2C_SCL_GPIO_CLK RCC_APB2Periph_GPIOB
#define OLED_I2C_SCL_SOURCE GPIO_PinSource6
#define OLED_I2C_SCL_AF GPIO_AF_I2C1

#define OLED_I2C_SDA_PIN GPIO_Pin_7 
#define OLED_I2C_SDA_GPIO_PORT GPIOB 
#define OLED_I2C_SDA_GPIO_CLK RCC_APB2Periph_GPIOB
#define OLED_I2C_SDA_SOURCE GPIO_PinSource7
#define OLED_I2C_SDA_AF GPIO_AF_I2C1

void I2C_Configuration(void)
{ 
        
	  I2C_InitTypeDef  I2C_InitStructure;
	  GPIO_InitTypeDef  GPIO_InitStructure; 

	  //外设I2C时钟使能
  	  OLED_I2C_CLK_INIT(OLED_I2C_CLK,ENABLE);
	  //外设GPIO时钟使能
	  RCC_APB2PeriphClockCmd(OLED_I2C_SCL_GPIO_CLK | OLED_I2C_SDA_GPIO_CLK,ENABLE);

	 /* I2C_SCL、I2C_SDA*/
	  GPIO_InitStructure.GPIO_Pin = OLED_I2C_SCL_PIN;
	  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;	
	  GPIO_Init(OLED_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
		
	  GPIO_InitStructure.GPIO_Pin = OLED_I2C_SDA_PIN;
	  GPIO_Init(OLED_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);	
		
		/* I2C */
	  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;	
	  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
	  I2C_InitStructure.I2C_OwnAddress1 =OLED_ADDRESS;    //I2C地址
	  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable ;	
	  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;	//寻址方式
	  I2C_InitStructure.I2C_ClockSpeed = I2C_Speed;//速度
	  
	  I2C_Init(OLED_I2C, &I2C_InitStructure);	 //使能初始化
	  I2C_Cmd(OLED_I2C, ENABLE); //使能I2C
}

通过I2C写数据

//硬件I2C时序配置
void I2C_WriteByte(uint8_t addr,uint8_t data)
{ 
        
    //Checks whether the specified I2C flag is set or not.
    while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
	
	I2C_GenerateSTART(I2C1, ENABLE);//产生I2C起始信号
	while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));/*EV5,，主模式*/

	I2C_Send7bitAddress(I2C1, OLED_ADDRESS, I2C_Direction_Transmitter);//器件I2C地址0x78
	while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

	I2C_SendData(I2C1, addr);//寄存器地址
	while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

	I2C_SendData(I2C1, data);//数据
	while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
	
	I2C_GenerateSTOP(I2C1, ENABLE);//关闭I2C
}

//写命令
void WriteCmd(unsigned char I2C_Command)
{ 
        
	I2C_WriteByte(0x00, I2C_Command);
}
//写数据
void WriteDat(unsigned char I2C_Data)
{ 
        
	I2C_WriteByte(0x40, I2C_Data);
}

字位图（bmp）提取软件 pctolcd2002

所需要的配置

生成的汉字bmp数据
//16*16点阵，维护世界和平

unsigned char F16x16[]=
{ 
        
	0x20,0x30,0xAC,0x63,0x20,0x58,0x20,0xF8,0x4F,0x48,0x49,0xFA,0x48,0x48,0x08,0x00,
	0x22,0x67,0x22,0x12,0x12,0x12,0x00,0xFF,0x22,0x22,0x22,0x3F,0x22,0x22,0x20,0x00,//维
	0x10,0x10,0x10,0xFF,0x10,0x90,0x00,0xF8,0x88,0x89,0x8E,0x88,0x88,0x88,0xF8,0x00,
	0x04,0x44,0x82,0x7F,0x81,0x40,0x30,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,//护
	0x20,0x20,0x20,0xFE,0x20,0x20,0xFF,0x20,0x20,0x20,0xFF,0x20,0x20,0x20,0x20,0x00,
	0x00,0x00,0x00,0x7F,0x40,0x40,0x47,0x44,0x44,0x44,0x47,0x40,0x40,0x40,0x00,0x00,//世
	0x00,0x00,0x00,0xFE,0x92,0x92,0x92,0xFE,0x92,0x92,0x92,0xFE,0x00,0x00,0x00,0x00,
	0x08,0x08,0x04,0x84,0x62,0x1E,0x01,0x00,0x01,0xFE,0x02,0x04,0x04,0x08,0x08,0x00,//界
	0x20,0x24,0x24,0xA4,0xFE,0x23,0x22,0x20,0x00,0xF8,0x08,0x08,0x08,0xF8,0x00,0x00,
	0x10,0x08,0x06,0x01,0xFF,0x01,0x06,0x00,0x00,0x3F,0x10,0x10,0x10,0x3F,0x00,0x00,//和
	0x00,0x02,0x02,0x12,0x62,0x02,0x02,0xFE,0x02,0x02,0x42,0x32,0x02,0x02,0x00,0x00,
	0x01,0x01,0x01,0x01,0x01,0x01,0x01,0xFF,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x00,//平
};

//显示中文函数
void OLED_ShowCN(unsigned char x, unsigned char y, unsigned char N)
{ 
        
	unsigned char wm=0;
	unsigned int  adder=32*N;
	OLED_SetPos(x , y);
	for(wm = 0;wm < 16;wm++)
	{ 
        
		WriteDat(F16x16[adder]);
		adder += 1;
	}
	OLED_SetPos(x,y + 1);
	for(wm = 0;wm < 16;wm++)
	{ 
        
		WriteDat(F16x16[adder]);
		adder += 1;
	}
}

//主函数调用
for(i=0;i<6;i++)//6 代表有6个字
{ 
        
	OLED_ShowCN(22+i*16,0,i);	//测试显示中文
}