SPI Problem with TiVac EK-TM4C1294XL

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/*
 *  ======== spiloopback.c ========
 */
/* XDCtools Header files */
#include <xdc/std.h>
#include <xdc/cfg/global.h>
#include <xdc/runtime/System.h>

/* BIOS Header files */
#include <ti/sysbios/BIOS.h>

/* TI-RTOS Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/SPI.h>

/* Example/Board Header files */
#include "Board.h"

#define SPI_MSG_LENGTH    20

/* Allocate buffers in .dma section of memory for concerto devices */
#ifdef MWARE
#pragma DATA_SECTION(slaveRxBuffer, ".dma");
#pragma DATA_SECTION(slaveTxBuffer, ".dma");
#endif

unsigned char slaveRxBuffer[SPI_MSG_LENGTH]="hello";
unsigned char slaveTxBuffer[SPI_MSG_LENGTH] =  "Hello, this is slav";
/* *  ======== slaveTaskFxn ========
 *  Task function for slave task.
 *
 *  This task runs on a higher priority, since slave
 *  has to be ready for master. Slave SPI sends a
 *  message to master and also receives message from
 *  master. Task for this function is created
 *  statically. See the project's .cfg file.
 */
Void slaveTaskFxn (UArg arg0, UArg arg1)
{
    SPI_Handle slaveSpi;
    SPI_Params slaveSpiParams;
    SPI_Transaction slaveTransaction;
    bool transferOK;

    /* Initialize SPI handle with slave mode */
    SPI_Params_init(&slaveSpiParams);
    slaveSpiParams.mode = SPI_SLAVE;
   // slaveSpiParams.

    slaveSpi = SPI_open(Board_SPI1, &slaveSpiParams);
    if (slaveSpi == NULL) {
        System_abort("Error initializing SPI\n");  System_flush();
    }
    else {
        System_printf("SPI initialized\n");  System_flush();
    }

    /* Initialize slave SPI transaction structure */
    slaveTransaction.count = SPI_MSG_LENGTH;
    slaveTransaction.txBuf = NULL;//(Ptr)slaveTxBuffer;
    slaveTransaction.rxBuf = (Ptr)slaveRxBuffer;

    while(1)
    {
		/* Initiate SPI transfer */
		transferOK = SPI_transfer(slaveSpi, &slaveTransaction);

		if(transferOK) {
			/* Print contents of slave receive buffer */
			System_printf("Slave: %d\n", slaveRxBuffer[0]);  System_flush();
		}
		else {
			System_printf("Unsuccessful slave SPI transfer");  System_flush();
		}
    }

    /* Deinitialize SPI */
    SPI_close(slaveSpi);
}

/*
 *  ======== main ========
 */
int main(void)
{
    /* Call board init functions. */
    Board_initGeneral();
    Board_initGPIO();
    Board_initSPI();

    /* Turn on user LED */
    GPIO_write(Board_LED0, Board_LED_ON);

    System_printf("Starting the SPI loop-back example\nSystem provider is set to"
                  " SysMin. Halt the target to view any SysMin contents in ROV.\n");
    /* SysMin will only print to the console when you call flush or exit */
    System_flush();
    System_printf("This example requires external wires to be connected to the "
                  "header pins. Please see the Getting Started Guide for "
                  "details.\n");
    /* SysMin will only print to the console when you call flush or exit */
    System_flush();

    /* Start BIOS */
    BIOS_start();

    return (0);
}