IIC的再认识

IIC介绍

关于IIC的基本概念，其实在学习89C52的时候已经大致了解过了，且由于STM32支持了IIC协议，所以在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：

那么对于之前学习的概念，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：

由于这个图片之前我在取模软件中已经取过模，所以直接拿来用了：

code unsigned char bmpPic[] = { //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
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0x38,0xE0,0xE0,0x3C,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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};

CubeMX

1. 惯例配置

2. 点击左侧的I2C1，选择I2C:

2.1 在上图下方可以看到IIC的一些配置信息，此处暂时不做修改

 

2.2 点击上图中的GPIO Setting:

所以OLED的SCL和SDA应该分别接在 PB6 和 PB7 !

3. 惯例配置生成代码：

 

 

Keil

unsigned char bmpPic[] = { //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
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x01,0x03,0x0E,0x08,0x08,0x08,0x0C,0x06,0x03,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x00,0x00,0x00,0x00,0x00,
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,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};

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 dataData)
{
    HAL_I2C_Mem_Write(&hi2c1, 0x78, 0x40, I2C_MEMADD_SIZE_8BIT, &dataData, 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;
	int j;
	
	for(i = 0; i<8; i++){
		OLED_writecmd(0xB0 + i);//依次选择每一页
		OLED_writecmd(0x00);//选择0列
	  OLED_writecmd(0x10);//选择0列
		for(j = 0; j<128; j++){
			OLED_writedata(0x00);//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
		}
	}
}
 
void print_pic(unsigned char *pic)
{
	unsigned int i;//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
	unsigned int j;//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
	
	for(i = 0; i<8; i++){
		OLED_writecmd(0xB0 + i);//依次选择每一page
		OLED_writecmd(0x00);//选择0列
	  OLED_writecmd(0x10);//选择0列
		for(j = 128*i; j<(128*(i+1)); j++){ 
			OLED_writedata(pic[j]);
		}
	}
}

int main(void)
{	
	Oled_Init();
	Oled_Clear();
	
	OLED_writecmd(0x20);//页寻址模式
	OLED_writecmd(0x02);//页寻址模式
	
	print_pic(bmpPic);


  while (1)
  {

  }

}

实现效果 

 

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