// The GPIO port A pin numbers for the various SSI signals.
	//
	#define SSI_CS                  GPIO_PIN_3
	#define SSI_CLK                 GPIO_PIN_2
	#define SSI_TX                  GPIO_PIN_5
	#define SSI_RX                  GPIO_PIN_4

    // Set the clocking to run directly from the crystal.
    //
    SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
                   SYSCTL_XTAL_6MHZ);

    // Enable the peripherals used by this example.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

    // Configure the appropriate pins to be SSI instead of GPIO.  Note that
    // the chip select is kept as a GPIO to guarantee the appropriate
    // signalling to the Atmel device.
    //
    GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, SSI_CS);
    GPIOPinWrite(GPIO_PORTA_BASE, SSI_CS, SSI_CS);
    GPIOPinTypeSSI(GPIO_PORTA_BASE, SSI_CLK | SSI_TX | SSI_RX);

    //
    // Configure and enable the SSI port for master mode.
    //
    SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0,
                       SSI_MODE_MASTER, 1000000, 16);
    SSIEnable(SSI0_BASE);