STM320F I2C RTC

void InitI2C(void)

{

    RCC_AHBPeriphClockCmd (RCC_AHBPeriph_GPIOB, ENABLE);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

    GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_1);

    GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_1);

    //Configure pins: SCL and SDA ------------------

    GPIO_InitStructure.GPIO_Pin     = (GPIO_Pin_6 | GPIO_Pin_7);

    GPIO_InitStructure.GPIO_Speed   = GPIO_Speed_2MHz;

    GPIO_InitStructure.GPIO_Mode    = GPIO_Mode_AF;

    GPIO_InitStructure.GPIO_PuPd    = GPIO_PuPd_UP;

    GPIO_InitStructure.GPIO_OType   = GPIO_OType_OD;

    GPIO_Init(GPIOB, &GPIO_InitStructure);

    I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;

    I2C_InitStructure.I2C_OwnAddress1 = 0x00;

    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;

    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;

    //I2C_InitStructure.I2C_Timing = 0xA0120227;

    I2C_InitStructure.I2C_Timing = 0x20310A0D;

    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

    I2C_Init(I2C1, &I2C_InitStructure);

    I2C_Cmd(I2C1, ENABLE);

}

uint8_t WRiteReg(uint8_t data,uint8_t RegAdd)

{

    //while(I2C_GetFlagStatus(I2C1, I2C_ISR_BUSY) != RESET)

    I2C_GenerateSTART(I2C1, ENABLE);

    I2C_SendData(I2C1, 0xA2);

    I2C_SendData(I2C1, (uint8_t)RegAdd);

    //while(I2C_GetFlagStatus(I2C1, I2C_ISR_TC) == RESET)

    I2C_SendData(I2C1, (uint8_t)data);

    //while(I2C_GetFlagStatus(I2C1, I2C_ISR_TC) == RESET)

    I2C_GenerateSTOP(I2C1, ENABLE);

    //while(I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF));

    return SUCCESS;

}