关于msp430 IIC 操作问题，msp430f5229

最近尝试使用ti的ccs的driver lib  库函数来写代码，

#define SLAVE_ADDRESS 0x48

uint8_t transmitData;

void main(void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);

    //Assign I2C pins to USCI_B0
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P3,
        GPIO_PIN1 + GPIO_PIN2
        );

    //Initialize transmit data packet
    transmitData = 0x01;

    //Initialize Master
    USCI_B_I2C_initMasterParam param = {0};
    param.selectClockSource = USCI_B_I2C_CLOCKSOURCE_SMCLK;
    param.i2cClk = UCS_getSMCLK();
    param.dataRate = USCI_B_I2C_SET_DATA_RATE_400KBPS;
    USCI_B_I2C_initMaster(USCI_B0_BASE, &param);

    //Specify slave address
    USCI_B_I2C_setSlaveAddress(USCI_B0_BASE,
                               SLAVE_ADDRESS
                               );

    //Set in transmit mode
    USCI_B_I2C_setMode(USCI_B0_BASE,
                       USCI_B_I2C_TRANSMIT_MODE
                       );

    //Enable I2C Module to start operations
    USCI_B_I2C_enable(USCI_B0_BASE);

    //Enable TX interrupt
    USCI_B_I2C_clearInterrupt(USCI_B0_BASE,
                              USCI_B_I2C_TRANSMIT_INTERRUPT
                              );
    USCI_B_I2C_enableInterrupt(USCI_B0_BASE,
                               USCI_B_I2C_TRANSMIT_INTERRUPT
                               );

    while(1)
    {
        //Send single byte data.
        USCI_B_I2C_masterSendSingleByte(USCI_B0_BASE,
                                        transmitData
                                        );

        //Delay until transmission completes
        while(USCI_B_I2C_isBusBusy(USCI_B0_BASE))
        {
            ;
        }

        //Delay between each transaction
        __delay_cycles(50);

        //Increment transmit data counter
        transmitData++;
    }
}

//******************************************************************************
//
//This is the USCI_B0 interrupt vector service routine.
//
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_B0_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(USCI_B0_VECTOR)))
#endif
void USCI_B0_ISR(void)
{
    switch(__even_in_range(UCB0IV,12))
    {
    //Vector 12: Transmit buffer empty – TXIF
    case USCI_I2C_UCTXIFG:
    {
        __no_operation();
        break;
    }
    default:  break;
    }
}

这是官方的代码，刚开始学习，我想知道iic当我发送给从设备地址+读命令，然后在发送一个读的寄存器地址，我怎么来接收从设备给我的数据呢，代码怎么操作呢，我看了官方的参考，都是单独发或者单独收，我怎么才能才发完读取命令后，切换到接收来接收数据呢？

不知道有没有实际用库函数操作从设备获取设备数据的参考，我想借鉴一下。

thanks a lot！

zhanfeng dong：

回复 灰小子:

thanks,

iic  协议，我理解，刚开始理解差了，想多了，只要把把接收中断打开，硬件iic就会处理了，我只要把读出buf就没问题了，唉，看来是多想了。