回复【2楼】304301959:
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你用下面的初始化步骤试一下，我的I2C现在正常了


void  I2CMasterInit(void)
{
        
 //   I2C_DeInit(I2C_MASTER);
    
    I2CMaster_RCC_Configuration();
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,  ENABLE);// enable GPIOB CLOCK
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
      /* Reset sEE_I2C IP */
    RCC_APB1PeriphResetCmd(I2C_MASTER_CLK, ENABLE);
  /* Release reset signal of sEE_I2C IP */
    RCC_APB1PeriphResetCmd(I2C_MASTER_CLK, DISABLE);//非常重要,没有这句RESER语句会导致总线不能释放
    I2CMaster_GPIO_Configuration();
           
        
   // I2C_InitStructure.I2C_Mode = I2C_Mode_SMBusHost;//;I2C_Mode_I2C, very importan ,or I2C can not be work
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;//for fast model
    I2C_InitStructure.I2C_OwnAddress1 = 0x00;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = I2C_MSATER_SPEED;
    
    // I2CMaster_NVIC_Configuration();
    /*!< Enable SMBus EVT interrupt */

    I2C_Cmd(I2C_MASTER, ENABLE);
    I2C_Init(I2C_MASTER, &I2C_InitStructure);
    I2CMaster_NVIC_Configuration();//必须放在I2C_Init(I2C_MASTER, &I2C_InitStructure)函数后面，放在前面就不正常。2013.1.10 cheng yun
    I2C_ITConfig(I2C_MASTER, I2C_IT_EVT | I2C_IT_ERR| I2C_IT_BUF, ENABLE);//| I2C_IT_ERR very importan ,or I2C can not be work 
}

void I2CMaster_RCC_Configuration(void)
{
    /* Enable peripheral clocks --------------------------------------------------*/
    RCC_APB1PeriphClockCmd(I2C_MASTER_CLK, ENABLE);   

}
void I2CMaster_GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure; 
    // I2C I0口初始化.
    // Configure I2C1 pins: SCL and SDA ---------------------------------------
    
  //  GPIO_PinAFConfig(GPIOB, GPIO_PinSource6|GPIO_PinSource9, GPIO_AF_I2C1);//非常重要，一定不能这么写，否则SCL SDA都拉低，一定要分开写，见下面。2013.1.10 cheng yun
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_I2C1);
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);

   // GPIO_InitStructure.GPIO_Pin =  I2C_MASTER_SCL | I2C_MASTER_SDA;
   
//CONFIG scl
    GPIO_InitStructure.GPIO_Pin =  I2C_MASTER_SCL;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  // GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(I2C_MASTER_GPIO, &GPIO_InitStructure);
//CONFIG SDA

    GPIO_InitStructure.GPIO_Pin =  I2C_MASTER_SDA;
    //GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
   //GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
   //GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
   //GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
   //GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(I2C_MASTER_GPIO, &GPIO_InitStructure);

}
void I2CMaster_NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    /* 1 bit for pre-emption priority, 3 bits for subpriority */
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    /* Configure and enable I2CMASTER interrupt --------------------------------*/
    NVIC_InitStructure.NVIC_IRQChannel = I2C_MASTER_EV_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = NVICPreemptionPriority_I2CMASTER; //same as mido
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = NVICSubPriorityPriority_I2CMASTER_EV;
    NVIC_Init(&NVIC_InitStructure);

    /* Configure and enable SI2CMASTER interrupt --------------------------------*/
    NVIC_InitStructure.NVIC_IRQChannel = I2C_MASTER_ER_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = NVICPreemptionPriority_I2CMASTER; //same as mido
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = NVICSubPriorityPriority_I2CMASTER_ER;
    NVIC_Init(&NVIC_InitStructure);
}


你可以参考下库函数文件夹里面的例程，有个I2C的文件夹，也可以按照它的初始化步骤来。