timer.c

/*
 * timer.c
 *
 *  Created on: Feb 13, 2017
 *      Author: srazak
 *  Modified on: Sept 2, 2019
 *      Author: efeoflus
 *
 */

#include <stdint.h>
#include <stdbool.h>
#include <tm4c123gh6pm.h>
#include <sysctl.h>


void SystickInit()
{
    NVIC_ST_CTRL_R = 0;
    NVIC_ST_RELOAD_R = 0x00FFFFFF;
    NVIC_ST_CURRENT_R = 0;
    NVIC_ST_CTRL_R = 0x00000005;

}

/** busy waiting for one tick, 12.5ns if using 80MHZ **/
void SysTick_Wait(uint32_t delay)
{

     NVIC_ST_RELOAD_R = delay - 1;
     NVIC_ST_CURRENT_R = 0;
     while ((NVIC_ST_CTRL_R&0x00010000)==0){}
 }


void SysTick_Wait10ms(uint32_t delay)
{
    uint32_t i;
    for (i = 0; i <delay;i++)
        SysTick_Wait(800000);
}

 void SysTick_Wait1ms(uint32_t delay)
{
      uint32_t i;
      for (i = 0; i <delay;i++)
          SysTick_Wait(80000);
}


 void SysTick_Wait100microsec(uint32_t delay)
 {
     uint32_t i;
     for (i = 0; i <delay;i++)
         SysTick_Wait(8000);
 }

 void SysTick_Wait10microsec(uint32_t delay)
 {
      uint32_t i;
      for (i = 0; i <delay;i++)
          SysTick_Wait(800);
 }

void SysTick_Wait1microsec(uint32_t delay)
{
       uint32_t i;
       for (i = 0; i <delay;i++)
           SysTick_Wait(80);
}

void SysTick_Wait100nanosec(uint32_t delay)
{
       uint32_t i;
       for (i = 0; i <delay;i++)
           SysTick_Wait(8);
}