硬件IIC配置如下：

main.c文件
#define SLAVE_ADDR 0xA0  //该从机地址
#define I2CSPEED 100000 //i2c速度


/******************************IIC从机初始化******************************************************/
void IIC_INIT()
{
        I2C_Init(I2CSPEED, SLAVE_ADDR , I2C_DUTYCYCLE_2, I2C_ACK_CURR, I2C_ADDMODE_7BIT, 16);//I2C初始化
        I2C_ITConfig((I2C_IT_TypeDef)(I2C_IT_ERR | I2C_IT_EVT | I2C_IT_BUF), ENABLE);
        //100K速率，16位自身地址，占空比=2，应答当前字节，从模式地址长度
        //8位输入时钟频率
        //I2C_ITConfig((I2C_IT_TypeDef)(I2C_IT_ERR | I2C_IT_EVT | I2C_IT_BUF), ENABLE);
        //I2C_Cmd(ENABLE);//开启IIC               
}


int main(void)
{
     CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);//时钟初始化（不分频）时钟为1分频16M 2分频8M
     IIC_INIT();//iic初始化
     enableInterrupts();//中断使能开启

     while(1)
    {
             ;
    }
}



stm8sit.c
u8 count = 0;



INTERRUPT_HANDLER(I2C_IRQHandler, 19)
{
  /* In order to detect unexpected events during development,
     it is recommended to set a breakpoint on the following instruction.
  */
    /* In order to detect unexpected events during development,
     it is recommended to set a breakpoint on the following instruction.
  */
//接收发送
    //printf("DHT11！\r\n");
  /* In order to detect unexpected events during development,
     it is recommended to set a breakpoint on the following instruction.
  */
//接收发送
    u8 temp = 0;
    if (I2C->SR1&0x02)//地址已经匹配(读SR1，SR3清除该位)
    {
        I2C->SR3&0x07;
        ++count;
        if(count == 1)
        {
          I2C->DR = 0x11;//主机第一次读该从机，该从机发送0x11
        }
        else if(count == 2)
        {
          I2C->DR = 0x22;//主机第二次读该从机，该从机发送0x22
          count = 0;
        }
    }
    else if ((I2C->SR1&0x84)&&(I2C->SR3&0x04))//数据字节传送完
    {

        //temp = 0xA5;    //假设这里发送0xA5

    }
    else if ((I2C->SR1&0x40)&&(0 == (I2C->SR3&0x04)))//接收时数据寄存器
    {
        temp = I2C->DR;    //读取数据寄存器

    }
    else if (I2C->SR1&0x10)//检测到停止位
    {
        I2C->CR2 = I2C->CR2;//清除停止位
    }
    //错误处理
    if (I2C->SR2&0x01)//总线错误
    {
        I2C->SR2 &= ~0x01;//清零
    }
    else if(I2C->SR2&0x02)//仲裁失败
    {
        I2C->SR2 &= ~0x02;//清零
    }
    else if(I2C->SR2&0x04)//应答失败
    {
        I2C->SR2 &= ~0x04;//清零
    }
    else if(I2C->SR2&0x08)//上溢、下溢
    {
        I2C->SR2 &= ~0x08;//清零
    }
    return;
}



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