RTOS/TM4C1294NCPDT: sample code for SPI Slave write to SPI Master in Tiva C series connect launchpad

/*SSI init function*?

void ssi_init(void)
{

    ui32SysClkFreq = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ | SYSCTL_OSC_MAIN | SYSCTL_USE_PLL | SYSCTL_CFG_VCO_480), 120000000);

    SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

    GPIOPinConfigure(GPIO_PA2_SSI0CLK);
    GPIOPinConfigure(GPIO_PA3_SSI0FSS);
    GPIOPinConfigure(GPIO_PA4_SSI0XDAT0);
    GPIOPinConfigure(GPIO_PA5_SSI0XDAT1);
    GPIOPinTypeSSI(GPIO_PORTA_BASE,GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2);

    SSIConfigSetExpClk(SSI0_BASE, ui32SysClkFreq, SSI_FRF_MOTO_MODE_0, SSI_MODE_MASTER, 10000, 16);
    SSIEnable(SSI0_BASE);

    SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI2);  //Enable ssi2
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD); //Enable PORT B GPIO to be used with ssi2 data and frame signals

    GPIOPinConfigure(GPIO_PD3_SSI2CLK);
    GPIOPinConfigure(GPIO_PD2_SSI2FSS);
    GPIOPinConfigure(GPIO_PD1_SSI2XDAT0);
    GPIOPinConfigure(GPIO_PD0_SSI2XDAT1);
    GPIOPinTypeSSI(GPIO_PORTD_BASE,GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);

    SSIConfigSetExpClk(SSI2_BASE, ui32SysClkFreq, SSI_FRF_MOTO_MODE_0, SSI_MODE_SLAVE, 10000, 16);
    SSIEnable(SSI2_BASE);
}


/*function to read the data from ssi0 in ssi2 and write it back to ssi0 and compare both*/
void test_spi(void)
{
    uint32_t ui32Index;
    uint32_t ui32Data;
    spi_data_index=0;
    memset(spi_data_recived_back, '\0', 15);
    for(ui32Index = 0; ui32Index < NUM_SSI_DATA; ui32Index++)
    {
       ui32Data = spi_test_command[ui32Index];
       SSIDataPut(SSI0_BASE, ui32Data);
       while(SSIBusy(SSI0_BASE))
       {
       }
       SSIDataGet(SSI2_BASE, &spi_recived_char);
       SSIDataPut(SSI2_BASE, spi_recived_char);


       while(SSIBusy(SSI2_BASE)) /* DEBUGEGER GET STUCK HERE*/
       {
       }

       SSIDataGet(SSI0_BASE, spi_recived_char);//&spi_data_recived_back[spi_data_index++]

    }
    if(strcmp(spi_test_command, spi_data_recived_back) == 0)
    {
        pass_or_fail = 1;
        UARTprintf("\n\rPASSED\n\r");
    }
    else
    {
        pass_or_fail = 0;
        UARTprintf("\n\rFAILED\n\r");
    }

    return;
}