[参考译文] TM4C123GH6PM：使用 I2C 从温度传感器 TMP117读取

uint32_t I2C_init(void)
{
    // Enable the I2C0 peripheral
    MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C1);

    I2CMasterEnable(I2C1_BASE);
    SysCtlPeripheralReset(SYSCTL_PERIPH_I2C1);
    SysCtlPeripheralReset(SYSCTL_PERIPH_I2C1);

    // Wait for the I2C0 module to be ready.
    while(!SysCtlPeripheralReady(SYSCTL_PERIPH_I2C1))
    {
    }

    MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

    // Configure the GPIO Pin Mux for PA6 for I2C1SCL
    MAP_GPIOPinConfigure(GPIO_PA6_I2C1SCL);
    MAP_GPIOPinTypeI2CSCL(GPIO_PORTA_BASE, GPIO_PIN_6);


    // Configure the GPIO Pin Mux for PA7 for I2C1SDA
    MAP_GPIOPinConfigure(GPIO_PA7_I2C1SDA);
    MAP_GPIOPinTypeI2C(GPIO_PORTA_BASE, GPIO_PIN_7);

    // Initialize Master and Slave
    I2CMasterInitExpClk(I2C1_BASE, SysCtlClockGet(), false);

    while(I2CMasterBusBusy(I2C1_BASE))
    {
    }
    return 0;
}

uint32_t I2C_write16BitRegister(uint8_t slaveAddress, uint32_t addressPointer, uint8_t firstByte, uint8_t secondByte)
{
    I2CMasterSlaveAddrSet(I2C1_BASE, slaveAddress, false);
    I2CMasterDataPut(I2C1_BASE, addressPointer); // pointer auf Unlock register
    I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_SEND_START);
    while(I2CMasterBusy(I2C1_BASE))
    {
    }
    I2CMasterDataPut(I2C1_BASE, firstByte); // Bit 15 setzen
    I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
    while(I2CMasterBusy(I2C1_BASE))
    {
    }

    I2CMasterDataPut(I2C1_BASE, secondByte);
    I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);
    while(I2CMasterBusy(I2C1_BASE))
    {
    }
    return 0;
}

uint32_t I2C_read16BitRegister(uint8_t slaveAddress, uint8_t registerAddress)
{
    /*
     * Einzelne Schreibaktion spricht den Sensor an und
     * stellt den Address-Pointer des Sensors auf jenes Register,
     * welches im zweiten Teil gelesen werden soll.
     */
    I2CMasterSlaveAddrSet(I2C1_BASE, slaveAddress, false); // set slave address
    I2CMasterDataPut(I2C1_BASE, registerAddress); // set register to be read
    I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_SINGLE_SEND);
    while(I2CMasterBusy(I2C1_BASE))
    {
    }

    /*---------------------------------READ-Section----------------------------------------
     * Hier zwei Bytes im Burstmode auslesen und zusammensetzen
     */
    I2CMasterSlaveAddrSet(I2C1_BASE, slaveAddress, true); // set slave address

    //read first Byte
    I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);
    while(I2CMasterBusy(I2C1_BASE))
    {
    }
    uint32_t msb=I2CMasterDataGet(I2C1_BASE);

    //read second Byte
    I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
    while(I2CMasterBusy(I2C1_BASE))
    {
    }
    uint32_t lsb=I2CMasterDataGet(I2C1_BASE);

    return ((msb << 8) | lsb);
}