STM32F051的I2C程序问题

*************IO端口配置****************

static void I2C_GPIO_Config(void) //I2C2 I/O配置

{

        GPIO_InitTypeDef GPIO_InitStructure;

        RCC_AHBPeriphClockCmd  (RCC_AHBPeriph_GPIOF,ENABLE ); 

 



         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

        GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;

        GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

                

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;// SCL-PF6

        GPIO_Init(GPIOF, &GPIO_InitStructure); 

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;// SDA-PF7

        GPIO_Init(GPIOF, &GPIO_InitStructure);         

        //connect pin to Periph

        GPIO_PinAFConfig(GPIOF, GPIO_PinSource6, GPIO_AF_0); 

        GPIO_PinAFConfig(GPIOF, GPIO_PinSource7, GPIO_AF_0);        

}

<p>static void I2C_Mode_Config(void) //I2C ¹¤×÷ģʽÅäÖÃ

{  

        I2C_InitTypeDef I2C_InitStructure; 



        I2C_DeInit  (I2C2);

        

        I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;  

         I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; 

        I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;

        I2C_InitStructure.I2C_DigitalFilter = 0x00;

        I2C_InitStructure.I2C_OwnAddress1 = 0x00;

        I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;

        I2C_InitStructure.I2C_Timing = 0x00B01A4B;

        I2C_Init(I2C2, &I2C_InitStructure);           

        I2C_Cmd  (I2C2,ENABLE);   

}

</p>

void I2C_ByteWrite(uint8_t Slave_Address,uint8_t REG_Address,uint8_t REG_Data) //дһ¸ö×Ö½Úµ½I2CÉ豸¼Ä´æÆ÷ÖÐ

{



        uint32_t i;

        while(I2C_GetFlagStatus(I2C2,I2C_FLAG_BUSY));

        I2C_TransferHandling(I2C2,Slave_Address,1,I2C_AutoEnd_Mode,I2C_Generate_Start_Write);   // I2C_AutoEnd_Mode

        while(I2C_GetFlagStatus(I2C2,I2C_ISR_TXIS) == RESET);//

        I2C_SendData(I2C2,REG_Address);

        while(I2C_GetFlagStatus(I2C2,I2C_ISR_TC) == RESET);

        I2C_TransferHandling(I2C2,Slave_Address,1,I2C_AutoEnd_Mode,I2C_No_StartStop);   // I2C_Generate_Start_Write

        while(I2C_GetFlagStatus(I2C2,I2C_ISR_TXIS) == RESET);

        I2C_SendData(I2C2, REG_Data);

        while(I2C_GetFlagStatus(I2C2,I2C_ISR_STOPF) == RESET);

}