int
main(void)
{
    uint32_t pui32DataTx2[4];
    uint32_t pui32DataRx2[8];
    uint32_t ui32Index;
    //
    // Set the clocking to run directly from the external crystal/oscillator.
    // TODO: The SYSCTL_XTAL_ value must be changed to match the value of the
    // crystal on your board.
    //
    g_ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
                SYSCTL_OSC_MAIN | SYSCTL_USE_PLL |
                SYSCTL_CFG_VCO_480), 120000000);
    //
    // Set up the serial console to use for displaying messages.  This is
    // just for this example program and is not needed for SSI operation.
    //
    ConfigureUART();
    //
    // Initialize and enable CS
    //
    InitGPIO();
    //
    // Display the setup on the console.
    //
    UARTprintf("\n\nSSI ->\n");
    UARTprintf("  Mode: SPI\n");
    UARTprintf("  Data: 8-bit\n\n");
    //
    // Init SPI0 as master.
    //
    InitSPI0();
    //
    // 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, &pui32DataRx2[0]))
    {
    }
    //
    // Initialize the data to send.
    //
    pui32DataTx2[0] = 0x00;
    pui32DataTx2[1] = 0x02;
    pui32DataTx2[2] = 0x2B;
    pui32DataTx2[3] = 0x0A;
    //
    // Display indication that the SSI is transmitting data.
    //
    GPIOPinWrite(GPIO_PORTH_BASE, GPIO_PIN_0, 0x0);
	
    //
    // Send 4 bytes of data.
    //
    for(ui32Index = 0; ui32Index < 4; 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, pui32DataTx2[ui32Index]);
    }
    //
    // Wait until SSI0 is done transferring all the data in the transmit FIFO.
    //
    while(SSIBusy(SSI0_BASE))
    {
    }

    GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_4, GPIO_PIN_4);
	GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_4);
    //
    // 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, &pui32DataRx2[0]))
    {
    }

    //
    // Display the 8 bytes of data that were read from RX FIFO.
    //
    for(ui32Index = 0; ui32Index < 8; ui32Index++)
    {
        //
        // Put dummy bytes out to read bytes in
        //
        SSIDataPut(SSI0_BASE, 0xFF);
        //
        // 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, &pui32DataRx2[ui32Index]);
        //
        // Since we are using 8-bit data, mask off the MSB.
        //
        pui32DataRx2[ui32Index] &= 0x00FF;
    }
    //
    // Wait until SSI0 is done transferring all the data in the transmit FIFO.
    //
    while(SSIBusy(SSI0_BASE))
    {
    }
    //CS high
    GPIOPinWrite(GPIO_PORTH_BASE, GPIO_PIN_0, GPIO_PIN_0);
    //
    // Return no errors
    //
    return(0);
}