MSP430FR5969 I2C driverlib issues

Hi all,

I recently purchased the MSP430FR5969 launchpad, and I'm trying to interface it with the SHT21 on the SensorHub boosterpack. However, I am having trouble with the MSP430 driverlib. First, let me post the relevant code:

Main code:

void main(void){
    WDT_A_hold(WDT_A_BASE);             // Stop watchdog
 
    // Set ACLK to extern crystal for TimerB use
    CS_clockSignalInit(CS_ACLK, CS_LFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);
 
    // Configure pins as I2C
    GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1, GPIO_PIN6 + GPIO_PIN7, GPIO_SECONDARY_MODULE_FUNCTION);
 
    // Disable the GPIO power-on default high-impedance mode to activate previously configured port settings
    PMM_unlockLPM5();
 
    // Initialize master
    EUSCI_B_I2C_masterInit(EUSCI_B0_BASE,
                           EUSCI_B_I2C_CLOCKSOURCE_SMCLK,
                           CS_getSMCLK(),
                           EUSCI_B_I2C_SET_DATA_RATE_400KBPS,
                           1,
                           EUSCI_B_I2C_NO_AUTO_STOP
                           );
 
    tSHT2x ShtSensHub;
 
    while(1){
        // Read temperature
        SHT21ReadTemperature(&ShtSensHub);
 
        // Place breakpoint here
        __no_operation();
 
        // Delay
        __delay_cycles(500000);
    }
}

Read temperature function

// Used to read and convert temperature from SHT21
void SHT21ReadTemperature(tSHT2x *psInst){
    // Set SHT21 address
    EUSCI_B_I2C_setSlaveAddress(EUSCI_B0_BASE, SHT21_I2C_ADDRESS);
 
    //Set in transmit mode
    EUSCI_B_I2C_setMode(EUSCI_B0_BASE, EUSCI_B_I2C_TRANSMIT_MODE);
 
    //Enable I2C Module to start operations
    EUSCI_B_I2C_enable(EUSCI_B0_BASE);
 
    //Send single byte data.
    EUSCI_B_I2C_masterSendSingleByte(EUSCI_B0_BASE, SHT21_TEMP_NOBLOCK);
 
    //Delay until transmission completes
    while (EUSCI_B_I2C_isBusBusy(EUSCI_B0_BASE)) ;
 
    //Setup timer
    TIMER_B_clearTimerInterruptFlag(TIMER_B0_BASE);
    TIMER_B_configureUpMode(   TIMER_B0_BASE,
                               TIMER_B_CLOCKSOURCE_ACLK,
                               TIMER_B_CLOCKSOURCE_DIVIDER_1,
                               CS_getACLK()/11,
                               TIMER_B_TBIE_INTERRUPT_DISABLE,
                               TIMER_B_CAPTURECOMPARE_INTERRUPT_ENABLE,
                               TIMER_B_DO_CLEAR
                               );
 
    // Start timer
    TIMER_B_startCounter(
            TIMER_B0_BASE,
            TIMER_B_UP_MODE
            );
 
    //Enter LPM3, enable interrupts
    __bis_SR_register(LPM0_bits + GIE);
 
    // After interrupt has fired, set master to receive mode
    EUSCI_B_I2C_setMode(EUSCI_B0_BASE, EUSCI_B_I2C_RECEIVE_MODE);
 
    // Send start
    EUSCI_B_I2C_masterReceiveStart(EUSCI_B0_BASE);
    while (EUSCI_B_I2C_isBusBusy(EUSCI_B0_BASE)) ;
 
    // Receive first byte
    psInst->i2cData[0] = EUSCI_B_I2C_masterMultiByteReceiveNext(EUSCI_B0_BASE);
    while (EUSCI_B_I2C_isBusBusy(EUSCI_B0_BASE)) ;
 
    // Receive second byte
    psInst->i2cData[1] = EUSCI_B_I2C_masterMultiByteReceiveNext(EUSCI_B0_BASE);
    while (EUSCI_B_I2C_isBusBusy(EUSCI_B0_BASE)) ;
 
    // Receive third (last) byte
    psInst->i2cData[2] = EUSCI_B_I2C_masterMultiByteReceiveFinish(EUSCI_B0_BASE);
    while (EUSCI_B_I2C_isBusBusy(EUSCI_B0_BASE)) ;
 
    // Disable I2C Module
    EUSCI_B_I2C_disable(EUSCI_B0_BASE);
 
    // Convert to temperature
    psInst->tempRaw = ((uint16_t)(psInst->i2cData[0]) << 8) | (uint16_t)(psInst->i2cData[1]);
    psInst->temp = (float)(psInst->tempRaw & 0xFFFC);
    psInst->temp = -46.85f + 175.72f * (psInst->temp/65536.0f);
}

The problem is this: when I upload the code, and I set a breakpoint at the no operation at the end of main, it never reaches it. When I pause the debugger, the code is not stopped specifically in my code, but in the function EUSCI_B_I2C_masterSendSingleByte, specifically on line 758: while (!(HWREG16(baseAddress + OFS_UCBxIFG) & UCTXIFG));  
I am not currently using I2C interrupts, and line 758 checks for an interrupt flags. Did I miss turning something on? Does anyone know what problem might be?

On a semi-related note, I found some errors in the documentation, and I would be happy to explain more if desired.

Thanks in advance!