LAUNCHXL-CC2640R2: I2C comm never has successful transfer

Part Number: LAUNCHXL-CC2640R2
Other Parts Discussed in Thread: DAC7571

I am new to I2C communication and I have made the following code to interface with a TI DAC7571. I have everything wired correctly and have made an initial code to only transmit signal.ampAC for now. The code seems correct to me but I still don't know why I can't get a successful transfer with I2C_Transfer(). Could anybody help me gain some insight as to what exactly is going wrong? CCS Cloud doesn't kick out any errors, it just never transfers the data. Sorry for the semi-messy code; it's obviously still a work in progress. Thanks in advance.

#include <unistd.h>
#include <stdint.h>
#include <stddef.h>
#include <stdio.h>

/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/I2C.h>
#include <ti/drivers/i2c/I2CCC26XX.h>
#include <ti/drivers/Power.h>
#include <ti/drivers/power/PowerCC26XX.h>
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Task.h>
#include <xdc/runtime/Types.h>

/* Board Header file */
#include "Board.h"

uint8_t rxBuffer[0];            // Receive buffer
uint8_t txBuffer[2];            // Transmit buffer
bool transferDone = false;
bool openDone = true;
bool status;

static void writeCallbackDefault(I2C_Handle handle, I2C_Transaction *transac, bool result){
    // Set length bytes
    if (result) {
        transferDone = true;
    } else {
        // Transaction failed, act accordingly...
    }
};

struct { //Used to store the signal amplitude (max is 4095)
    unsigned int ampAC : 12;
    unsigned int ampDC : 12;
} signal;



/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0){
   // Locals
    I2C_init();
    I2C_Handle handle;
    I2C_Params params;
    I2C_Transaction i2cTrans;
    
    // Configure I2C parameters.
    I2C_Params_init(&params);
    params.bitRate = I2C_400kHz;
    params.transferMode = I2C_MODE_CALLBACK;
    params.transferCallbackFxn = writeCallbackDefault;
    
    // Prepare data to send
    signal.ampAC = 2047;
    signal.ampDC = signal.ampAC/2;
	txBuffer[0] = signal.ampAC;
	txBuffer[1] = signal.ampAC >> 8;
        
    // Initialize master I2C transaction structure
    i2cTrans.writeBuf     = txBuffer;    
    i2cTrans.writeCount   = 2;
    i2cTrans.readBuf      = NULL;    
    i2cTrans.readCount    = 0;
    i2cTrans.slaveAddress = 0x4C;
    
    // Open I2C
    handle = I2C_open(Board_I2C0, &params);
    
    if (handle == NULL) {
        // Error opening I2C
        openDone = false;
        while (1);
    }
    
    // Do I2C transfer (in callback mode)
    I2C_transfer(handle, &i2cTrans);

    return (NULL);
}