  SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI2);

    //
    // For this example SSI0 is used with PortA[5:2].  The actual port and pins
    // used may be different on your part, consult the data sheet for more
    // information.  GPIO port A needs to be enabled so these pins can be used.
    
    // TODO: change this to whichever GPIO port you are using.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPION);
	
    //
    // Configure the pin muxing for SSI0 functions on port A2, A3, A4, and A5.
    // This step is not necessary if your part does not support pin muxing.
    // TODO: change this to select the port/pin you are using.
    //
    GPIOPinConfigure(GPIO_PD3_SSI2CLK);
    GPIOPinConfigure(GPIO_PN3_SSI2FSS);
    GPIOPinConfigure(GPIO_PD0_SSI2XDAT0);
    GPIOPinConfigure(GPIO_PD1_SSI2XDAT1);

    //
    // Configure the GPIO settings for the SSI pins.  This function also gives
    // control of these pins to the SSI hardware.  Consult the data sheet to
    // see which functions are allocated per pin.
    // The pins are assigned as follows:
    //      PA5 - SSI0Tx
    //      PA4 - SSI0Rx
    //      PA3 - SSI0Fss
    //      PA2 - SSI0CLK
    // TODO: change this to select the port/pin you are using.
    //
    GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 |
                   GPIO_PIN_2);

    //
    // Configure and enable the SSI port for SPI slave mode.  Use SSI0,
    // system clock supply, idle clock level low and active low clock in
    // freescale SPI mode, slave mode, 1MHz SSI frequency, and 8-bit data.
    // For SPI mode, you can set the polarity of the SSI clock when the SSI
    // unit is idle.  You can also configure what clock edge you want to
    // capture data on.  Please reference the datasheet for more information on
    // the different SPI modes.
    //
#if defined(TARGET_IS_TM4C129_RA0) ||                                         \
    defined(TARGET_IS_TM4C129_RA1) ||                                         \
    defined(TARGET_IS_TM4C129_RA2)
    SSIConfigSetExpClk(SSI0_BASE, ui32SysClock, SSI_FRF_MOTO_MODE_0,
                       SSI_MODE_SLAVE, 1000000, 8);
#else
    SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0,
                       SSI_MODE_SLAVE, 1000000, 8);
#endif

    //
    // Enable the SSI0 module.
    //
    SSIEnable(SSI0_BASE);

    //
    // Read any residual data from the SSI port.  This makes sure the receive
    // FIFOs are empty, so we don't read any unwanted junk.  This is done here
    // because the SPI SSI mode is full-duplex, which allows you to send and
    // receive at the same time.  The SSIDataGetNonBlocking function returns
    // "true" when data was returned, and "false" when no data was returned.
    // The "non-blocking" function checks if there is any data in the receive
    // FIFO and does not "hang" if there isn't.
    //
    while(SSIDataGetNonBlocking(SSI0_BASE, &pui32DataRx[0]))
    {
    }

    //
    // Initialize the data to send.
    //
    pui32DataTx[0] = 'S';
    pui32DataTx[1] = 'P';
    pui32DataTx[2] = 'I';

    //
    // Display indication that the SSI is transmitting data.
    //
    UARTprintf("Sent:\n  ");

    //
    // Send 3 bytes of data.
    //
    for(ui32Index = 0; ui32Index < NUM_SSI_DATA; ui32Index++)
    {
        //
        // Display the data that SSI is transferring.
        //
        UARTprintf("'%c' ", pui32DataTx[ui32Index]);

        //
        // Send the data using the "blocking" put function.  This function
        // will wait until there is room in the send FIFO before returning.
        // This allows you to assure that all the data you send makes it into
        // the send FIFO.
        //
        SSIDataPut(SSI0_BASE, pui32DataTx[ui32Index]);
    }

    //
    // Wait until SSI0 is done transferring all the data in the transmit FIFO.
    //
    while(SSIBusy(SSI0_BASE))
    {
    }
           delayms(1000);
    //
    // Display indication that the SSI is receiving data.
    //
    UARTprintf("\nReceived:\n  ");

    //
    // Receive 3 bytes of data.
    //
    for(ui32Index = 0; ui32Index < NUM_SSI_DATA; ui32Index++)
    {
        //
        // Receive the data using the "blocking" Get function. This function
        // will wait until there is data in the receive FIFO before returning.
        //
        SSIDataGet(SSI0_BASE, &pui32DataRx[ui32Index]);

        //
        // Since we are using 8-bit data, mask off the MSB.
        //
        pui32DataRx[ui32Index] &= 0x00FF;

        //
        // Display the data that SSI0 received.
        //
        UARTprintf("'%c' ", pui32DataRx[ui32Index]);
    }

    //
    // Return no errors
    return 0;
    //

}
