LM3S9b96 System Delay and Count Delay

Function prototype:
void SysCtlDelay (unsigned long ulCount)
Parameters:
ulCount is the number of iterations of the delay loop to be executed.
Description:
This function provides a method to generate a constant length delay. It is written in assembly to keep the delay consistent across toolchains
, thus avoiding the need to adjust the delay in the application based on the toolchain.
The loop takes 3 cycles/loop.
Returns:
None.

void Delay(unsigned long nCount)
{
for(; nCount != 0; nCount--);
}

#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/gpio.h"
#include "driverlib/sysctl.h"

/* For debugging PF1 <-> LED ---- --------------------------------------------------* /
#define LED_PERIPH SYSCTL_PERIPH_GPIOF
#define LED_PORT GPIO_PORTF_BASE
#define LED_PIN GPIO_PIN_1
#define LED_OFF 1 << 1
#define LED_ON ~(1 << 1) // Low level lights LED


void Delay(unsigned long nCount)
{
for(; nCount != 0; nCount--);
}


int main(void)
{
// Set the clocking to run directly from the crystal.
SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

SysCtlPeripheralEnable(LED_PERIPH); // Enable the GPIO port where the LED is located

GPIOPinTypeGPIOOutput(LED_PORT, LED_PIN); // Set the LED pin to output

while (1)
{
GPIOPinWrite(LED_PORT, LED_PIN, LED_ON); // Click Turn on LED
Delay(0xfff); // The experimental delay is 2.5ms
GPIOPinWrite(LED_PORT, LED_PIN, LED_OFF); // Turn off LED
Delay(0xfff); // The experimental delay is 2.5ms

/*
GPIOPinWrite(LED_PORT, LED_PIN , LED_ON); // Turn on LED
SysCtlDelay(SysCtlClockGet() / 3000); // Accurate delay 1ms
GPIOPinWrite(LED_PORT, LED_PIN, LED_OFF); // Turn off LED
SysCtlDelay(SysCtlClockGet() / 3000); // Accurate delay 1ms
*/
}
}

//********************************************************************************
//
// Accurate delay nms
//
//********************************************************************************

void Delay(DWORD nms)
{
SysCtlDelay((SysCtlClockGet() / 3000) * nms);
}