MSP430F5529使用IIC驱动MPU6050失败

extern uint8 IICreadBytes(uint8 dev, uint8 reg, uint8 length, uint8 *data)
{
    uint8 ret = 0;
    uint8 i = 0;
    volatile static uint8 cnt = 0;

    cnt = 0;
    USCI_B_I2C_setSlaveAddress(USCI_B0_BASE, dev);

    if(USCI_B_I2C_masterSendMultiByteStartWithTimeout(USCI_B0_BASE, reg, IIC_TIMEOUT))
    {
        // Can't lack  会卡在这个地方
        while(!USCI_B_I2C_getInterruptStatus(USCI_B0_BASE, USCI_B_I2C_TRANSMIT_INTERRUPT))
        ;

        // Can't clear transmit interrupt here, will cause error!!!

        USCI_B_I2C_masterReceiveMultiByteStart(USCI_B0_BASE);

        for(i=0; i<length-1; i++)
        {
            cnt++;
            while(!USCI_B_I2C_getInterruptStatus(USCI_B0_BASE, USCI_B_I2C_RECEIVE_INTERRUPT))
            ;
            data[i] = USCI_B_I2C_masterReceiveMultiByteNext(USCI_B0_BASE);
        }

        while(!USCI_B_I2C_getInterruptStatus(USCI_B0_BASE, USCI_B_I2C_RECEIVE_INTERRUPT))
        ;
        cnt++;
        ret = USCI_B_I2C_masterReceiveMultiByteFinishWithTimeout(USCI_B0_BASE, &data[i], IIC_TIMEOUT);
     }

     return ret;
}