微控制器：STM32F103
庫函式：V3.5
描述：利用系統核心檔案core_cm3.c內部SysTick實現1ms，1us的精準延時，時鐘72MHz，涉及中斷服務SysTick_Handler的註冊。

delay.h

#ifndef     __DELAY_H__
#define     __DELAY_H__
#include "stm32f10x.h"

extern  void DelayMs(__IO uint32_t nTime);
extern  void DelayUs(__IO uint32_t nTime);

//this function for systick handler function
 

extern  void TimingDelay_Decrement(void);
#endif

delay.c

#include "delay.h"

static __IO uint32_t TimingDelay;

void DelayMs(__IO uint32_t nTime)
{
    if (SysTick_Config(72000))
    { 
        /* Capture error */ 
        while (1);
    }
    TimingDelay = nTime;
    while(TimingDelay != 0);
}

void
 
    DelayUs(__IO uint32_t nTime)
{
    if (SysTick_Config(72))
    { 
        /* Capture error */ 
        while (1);
    }
    TimingDelay = nTime;
    while(TimingDelay != 0);
}

void TimingDelay_Decrement(void)
{
  if (TimingDelay != 0x00)
  { 
    TimingDelay--;
  }
}

中斷服務stm32f10x_it.c

void SysTick_Handler(void
 
)
{
    TimingDelay_Decrement();
}