RTOS/EK-TM4C1294XL: LaunchPad SPI coumnication with 7x10 R click

#include <stdbool.h>
#include <stdint.h>
#include <inc/hw_memmap.h>

/* XDCtools Header files */
#include <xdc/std.h>
#include <xdc/cfg/global.h>
#include <xdc/runtime/System.h>
#include <xdc/runtime/Error.h>
#include <xdc/runtime/Memory.h>

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

/* Currently unused RTOS headers that are needed
 * for advanced features like IPC. */
#include <ti/sysbios/knl/Semaphore.h>
#include <ti/sysbios/knl/Mailbox.h>
#include <ti/sysbios/knl/Event.h>
#include <ti/sysbios/hal/Timer.h>

/* Driverlib headers */
#include <driverlib/gpio.h>

/* Board Header files */
#include <Board.h>
#include <EK_TM4C1294XL.h>

/* Application headers */
#include <Blink_Task.h>
#include <UART_Task.h>
#include <TCPEcho_Task.h>

#include <driverlib/sysctl.h>
#include <driverlib/pin_map.h>
#include <driverlib/ssi.h>
#include "BSPIBus.h"


uint32_t g_ui32SysClock;
uint32_t ui32SysClock;
//uint16_t data;
uint32_t ui32SysClkFreq;
uint32_t ui32Index;
uint32_t ui32Data;
uint32_t ui32SysClkFreq;
uint32_t g_ui32SysClock;        // system clock in Hz
uint8_t font[10] = {0x7E, 0x0A, 0xB6, 0x9E, 0xCA, 0xDC, 0xFC, 0x0E, 0xFE, 0xDE};  // 7-Segment font, letters 0 to 9


//****************************************************************************
// Configuration of SPI (SSI2, on BoosterPack 2 connector, master mode, 9 Mbps)
//****************************************************************************

void InitSpi(void)
{

    // enable peripherals
    SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI2);     // enable SSI2 (for SPI)
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOQ);    // enable port Q for SSI I/O-pins

    // configure pins as SSI2 pins
    GPIOPinConfigure(GPIO_PQ0_SSI3CLK);      // Q0 for Clk
    GPIOPinConfigure(GPIO_PQ3_SSI3XDAT1);    // Q3 for Master Output Slave Input (MOSI)
    GPIOPinConfigure(GPIO_PQ2_SSI3XDAT0);    // Q2 for Master Input Slave Output (MISO)

    // configure pins for SSI2
    GPIOPinTypeSSI(GPIO_PORTQ_BASE, GPIO_PIN_3 |  GPIO_PIN_2 | GPIO_PIN_0);

    // configure SSI2 communication
    SSIConfigSetExpClk(SSI2_BASE, ui32SysClock, SSI_FRF_MOTO_MODE_0, SSI_MODE_MASTER, 10000000, 16);

    SSIEnable(SSI2_BASE);                    // enable the SSI2 module

    // Configure latch pin for 74HC595 (7seg click)
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOP);            // enable port Q
    GPIOPinWrite(GPIO_PORTP_BASE, GPIO_PIN_5, GPIO_PIN_5);  // set pin P5 to 1
    GPIOPinTypeGPIOOutput(GPIO_PORTP_BASE, GPIO_PIN_5);     // configure pin P5 for output
}


//****************************************************************************
// send byte over SPI on BoosterPack 1 connector, latch byte to outputs of 74HC595 (7seg click) after sending
void SpiSend (uint8_t data)
{

    SSIDataPut(SSI2_BASE, data);                            // send byte over SPI
    SysCtlDelay(100);                                       			// wait until byte was sent

    GPIOPinWrite(GPIO_PORTP_BASE, GPIO_PIN_5, 0);           // latch byte to outputs of 74HC595 (7seg click) with 0 on P5
    GPIOPinWrite(GPIO_PORTP_BASE, GPIO_PIN_5, GPIO_PIN_5);  // set P5 back to 1
																										// pulse width with no delay and optimization 2 is about 100 ns (measured), slow enough
}


int main(void)
{
     int i;
     InitSpi();
     while(1){
          for (i=0; i<10; i++) {
              SpiSend(font[i]);               // output next digit
             // SysCtlDelay(g_ui32SysClock/3);  // delay for about 1 second (3 cpu clock cycles per loop count)
              SysCtlDelay(1000000);         // fast scrolling of numbers, for inspection of signals on scope
          }
      }
}