IIC和OLED再认识

IIC介绍

51是由于芯片功能不齐全，以至于需要软件编写IIC

而STM32芯片足够将IIC配置在硬件当中以至于直接读写即可

忘记了可回顾51的16.IIC 协议和 OLED_oled,iic通信波特率-CSDN博客

在STM32中使用IIC可以直接调用HAL库的库函数：

HAL_StatusTypeDef HAL_I2C_Mem_Write(I2C_HandleTypeDef *hi2c,
                                    uint16_t DevAddress,
                                    uint16_t MemAddress,
                                    uint16_t MemAddSize,
                                    uint8_t *pData,
                                    uint16_t Size,
                                    uint32_t Timeout)
参数一：I2C_HandleTypeDef *hi2c，I2C设备句柄

参数二：uint16_t DevAddress，目标器件的地址，七位地址必须左对齐

参数三：uint16_t MemAddress，目标器件的目标寄存器地址

参数四：uint16_t MemAddSize，目标器件内部寄存器地址数据长度

参数五：uint8_t *pData，待写的数据首地址

参数六：uint16_t Size，待写的数据长度

参数七：uint32_t Timeout，超时时间

返回值：HAL_StatusTypeDef，HAL状态（OK，busy，ERROR，TIMEOUT）

硬件介绍

同样使用之前用过的OLED，使用的是IIC协议：

在对51的学习，可以轻易的写出对于OLED写命令和写数据的函数封装：

对OLED写命令：

void OLED_writecmd(uint8_t dataCmd)
{
    HAL_I2C_Mem_Write(&hi2c1, 0x78, 0x00, I2C_MEMADD_SIZE_8BIT, &dataCmd, 1, 0xff);
}

对OLED写数据：

void OLED_writedata(uint8_t dataData)
{
    HAL_I2C_Mem_Write(&hi2c1, 0x78, 0x40, I2C_MEMADD_SIZE_8BIT, &dataData, 1, 0xff);
}

在STM32里再次实现OLED的显示

假如我选择页寻址模式，显示以下图像的话

unsigned char image[] = {//使用unsigned可以使得原本从负数到正数的范围扩展到两倍的正数，适用于大量无符号数存在时
/*--  宽度x高度=64x64  64*8*8（16进制）--*/
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0x7F,0x3F,0xBF,0x9F,0xDF,0xDF,0xEF,0xEF,0xEF,0xE7,0xEF,0xEF,
0xFF,0xEF,0xEF,0xFF,0xFF,0xDF,0xDF,0xBF,0xBF,0x7F,0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0x3F,0xCF,
0xF3,0xF9,0xFC,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFB,0xF7,0xEF,
0x9F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x4F,0xF8,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0x7F,0xFF,0xFF,0xFF,0xFF,0x5F,0x1F,0x1F,0x1F,0x1F,
0x3F,0x0F,0x3F,0x3F,0xFF,0xBF,0xBF,0xBF,0xFF,0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFC,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x32,0x87,0x03,0xD9,
0xFF,0xF9,0x81,0x07,0x01,0x00,0x0F,0x1F,0x11,0x11,0x1F,0x06,0x00,0x00,0x80,0x80,
0x80,0x80,0x80,0x04,0x0F,0x17,0x11,0x17,0x0F,0x06,0x00,0x03,0x80,0xFD,0xFF,0x1F,
0xF3,0x87,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x3F,0x81,0xFC,0xFF,0xFF,0xFF,
0x00,0xFF,0xFF,0xFC,0xF0,0xE0,0xA0,0x60,0x40,0x40,0x40,0x40,0x00,0x83,0x84,0x80,
0x80,0x04,0x02,0xC0,0x40,0x40,0x40,0x20,0xE0,0xF0,0xF0,0xF8,0xFF,0xFF,0xFF,0x00,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x3F,0xC3,0xFC,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xF1,0xBF,0xFF,0xFF,0xFF,0x3F,0x9E,0xCC,0xE8,0xE0,0xE8,0xE9,0xE0,0xCA,0xC8,
0xC8,0xCA,0xC8,0xC9,0xC8,0xC4,0xE6,0x27,0x27,0xE7,0xEF,0xCF,0x8F,0x3F,0xFF,0xFE,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0xC3,0xFC,0xFF,0xCF,0x87,0x03,0x07,0x0F,0x8F,
0x07,0x07,0x03,0x87,0x7F,0xFC,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFD,0xFC,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0x81,
0xE1,0xC1,0xA3,0x03,0x01,0x00,0x91,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC0,0x7F,0xFF,0xFF,0xFF,0xFF,0xFC,0xFC,0xFC,0xFE,
0xFF,0xFF,0xFE,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x1F,0x1F,0x0F,
0x0F,0x0F,0x1F,0x1F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF
};

CubeMX

1. 常规配置

SYS->Debug->Serial Wire

RCC->High Speed Clock(HSE)->Crystal/Ceramic Resonator

时钟树HSE、PLLCLK打开，HCLK设置成72MHz

打开I2C1，选择I2C:

2.查看GPIO setting或者原理图，可知 OLED的SCL和SDA应该分别接在 PB6 和 PB7 !

3.生成代码

Keil

unsigned char image[] = {
/*--  宽度x高度=64x64  64*8*8（16进制）--*/
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0x7F,0x3F,0xBF,0x9F,0xDF,0xDF,0xEF,0xEF,0xEF,0xE7,0xEF,0xEF,
0xFF,0xEF,0xEF,0xFF,0xFF,0xDF,0xDF,0xBF,0xBF,0x7F,0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0x3F,0xCF,
0xF3,0xF9,0xFC,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFB,0xF7,0xEF,
0x9F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x4F,0xF8,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0x7F,0xFF,0xFF,0xFF,0xFF,0x5F,0x1F,0x1F,0x1F,0x1F,
0x3F,0x0F,0x3F,0x3F,0xFF,0xBF,0xBF,0xBF,0xFF,0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFC,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x32,0x87,0x03,0xD9,
0xFF,0xF9,0x81,0x07,0x01,0x00,0x0F,0x1F,0x11,0x11,0x1F,0x06,0x00,0x00,0x80,0x80,
0x80,0x80,0x80,0x04,0x0F,0x17,0x11,0x17,0x0F,0x06,0x00,0x03,0x80,0xFD,0xFF,0x1F,
0xF3,0x87,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x3F,0x81,0xFC,0xFF,0xFF,0xFF,
0x00,0xFF,0xFF,0xFC,0xF0,0xE0,0xA0,0x60,0x40,0x40,0x40,0x40,0x00,0x83,0x84,0x80,
0x80,0x04,0x02,0xC0,0x40,0x40,0x40,0x20,0xE0,0xF0,0xF0,0xF8,0xFF,0xFF,0xFF,0x00,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x3F,0xC3,0xFC,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xF1,0xBF,0xFF,0xFF,0xFF,0x3F,0x9E,0xCC,0xE8,0xE0,0xE8,0xE9,0xE0,0xCA,0xC8,
0xC8,0xCA,0xC8,0xC9,0xC8,0xC4,0xE6,0x27,0x27,0xE7,0xEF,0xCF,0x8F,0x3F,0xFF,0xFE,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0xC3,0xFC,0xFF,0xCF,0x87,0x03,0x07,0x0F,0x8F,
0x07,0x07,0x03,0x87,0x7F,0xFC,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFD,0xFC,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0x81,
0xE1,0xC1,0xA3,0x03,0x01,0x00,0x91,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC0,0x7F,0xFF,0xFF,0xFF,0xFF,0xFC,0xFC,0xFC,0xFE,
0xFF,0xFF,0xFE,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x1F,0x1F,0x0F,
0x0F,0x0F,0x1F,0x1F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF
};


void OLED_writecmd(uint8_t dataCmd)
{
	HAL_I2C_Mem_Write(&hi2c1,0x78,0x00,I2C_MEMADD_SIZE_8BIT,&dataCmd,1,0xff);
}


void OLED_writedata(uint8_t data)
{
	HAL_I2C_Mem_Write(&hi2c1,0x78,0x40,I2C_MEMADD_SIZE_8BIT,&data,1,0xff);

}

void OLED_Init()
{
	OLED_writecmd(0xAE);//--display off
	OLED_writecmd(0x00);//---set low column address
	OLED_writecmd(0x10);//---set high column address
	OLED_writecmd(0x40);//--set start line address  
	OLED_writecmd(0xB0);//--set page address
	OLED_writecmd(0x81); // contract control
	OLED_writecmd(0xFF);//--128   
	OLED_writecmd(0xA1);//set segment remap 
	OLED_writecmd(0xA6);//--normal / reverse
	OLED_writecmd(0xA8);//--set multiplex ratio(1 to 64)
	OLED_writecmd(0x3F);//--1/32 duty
	OLED_writecmd(0xC8);//Com scan direction
	OLED_writecmd(0xD3);//-set display offset
	OLED_writecmd(0x00);//
	
	OLED_writecmd(0xD5);//set osc division
	OLED_writecmd(0x80);//
	
	OLED_writecmd(0xD8);//set area color mode off
	OLED_writecmd(0x05);//
	
	OLED_writecmd(0xD9);//Set Pre-Charge Period
	OLED_writecmd(0xF1);//
	
	OLED_writecmd(0xDA);//set com pin configuartion
	OLED_writecmd(0x12);//
	
	OLED_writecmd(0xDB);//set Vcomh
	OLED_writecmd(0x30);//
	
	OLED_writecmd(0x8D);//set charge pump enable
	OLED_writecmd(0x14);//
	
	OLED_writecmd(0xAF);//--turn on oled panel		
}

void OLED_Clear()
{
	int i,j;
	for(i = 0;i<8;i++)
	{
		OLED_writecmd(0xB0 + i); //page 0 --page7
		//每个page从列
		OLED_writecmd(0x00);//选择0列
		OLED_writecmd(0x10);//选择0列
				//由于地址会自动偏移，所以只要重复写128次全0，就可以清一个PAGE
			for(j = 0;j < 128;j++)
			{
				OLED_writedata(0x00);
			}
				
	}

}




void OLED_Pic(unsigned char *image)
{
	unsigned char i;
	unsigned int j;
	for(i = 0;i<8;i++)
	{
		OLED_writecmd(0xB0 + i); //page 0 --page7
		//每个page从列
		OLED_writecmd(0x00);
		OLED_writecmd(0x10);
				//0到64列，以此写入0，每写入数据，列地址自动偏移
			for(j = 64*i;j < 64*(i+1);j++)
			{
				OLED_writedata(image[j]);
			}
				
	}

}


int main(void)
{

	//	1.OLED初始化
	OLED_Init();
	OLED_Clear();
	//2.选择一个位置
//	2.1确认页寻址模式
	OLED_writecmd(0x20);
	OLED_writecmd(0x02);
//	2.2选择page0  1011 0000
	OLED_writecmd(0xB0);


	OLED_Pic(image);
 
  while (1)
  {

  }

}

实验效果