STM32笔记：使用SysTick测量程序的运行时间

本实验用来测量延时函数（如下）的运行时间

void Delay(__IO u32 nCount)  

} 

//SysTick.c

#include "SysTick.h"
 
__IO u32 TimingDelay = 0;

void SysTick_Init(void)
{
	/* SystemFrequency / 1000       1ms中断一次
	 * SystemFrequency / 100000  	10us中断一次 
	 * SystemFrequency / 1000000    1us中断一次
	 */
//	if (SysTick_Config(SystemFrequency / 100000))	// ST3.0.0库版本
	if (SysTick_Config(SystemCoreClock / 1000000))	// ST3.5.0库版本
	{ 
		/* Capture error */ 
		while (1);
	}
		// 关闭滴答定时器 
	SysTick->CTRL &= ~ SysTick_CTRL_ENABLE_Msk;
}



 void Delay(__IO u32 nCount)	 
{
	for(; nCount != 0; nCount--);
} 
/*
 * 函数名：TimingDelay_Count
 * 描述  ：获取节拍程序
 * 输入  ：无
 * 输出  ：无
 * 调用  ：在SysTick中断函数SysTick_Handler()调用
 */  
void TimingDelay_Count(void)
{

	TimingDelay++;
}

//stm32f10x_it.c 

/**
  ******************************************************************************
  * @file    Project/STM32F10x_StdPeriph_Template/stm32f10x_it.c 
  * @author  MCD Application Team
  * @version V3.5.0
  * @date    08-April-2011
  * @brief   Main Interrupt Service Routines.
  *          This file provides template for all exceptions handler and 
  *          peripherals interrupt service routine.
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_it.h"

/** @addtogroup STM32F10x_StdPeriph_Template
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/


/* Private function prototypes -----------------------------------------------*/

extern void TimingDelay_Count(void);   //外部函数

/* Private functions ---------------------------------------------------------*/

/******************************************************************************/
/*            Cortex-M3 Processor Exceptions Handlers                         */
/******************************************************************************/

/**
  * @brief  This function handles NMI exception.
  * @param  None
  * @retval None
  */
void NMI_Handler(void)
{
}

/**
  * @brief  This function handles Hard Fault exception.
  * @param  None
  * @retval None
  */
void HardFault_Handler(void)
{
  /* Go to infinite loop when Hard Fault exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles Memory Manage exception.
  * @param  None
  * @retval None
  */
void MemManage_Handler(void)
{
  /* Go to infinite loop when Memory Manage exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles Bus Fault exception.
  * @param  None
  * @retval None
  */
void BusFault_Handler(void)
{
  /* Go to infinite loop when Bus Fault exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles Usage Fault exception.
  * @param  None
  * @retval None
  */
void UsageFault_Handler(void)
{
  /* Go to infinite loop when Usage Fault exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles SVCall exception.
  * @param  None
  * @retval None
  */
void SVC_Handler(void)
{
}

/**
  * @brief  This function handles Debug Monitor exception.
  * @param  None
  * @retval None
  */
void DebugMon_Handler(void)
{
}

/**
  * @brief  This function handles PendSVC exception.
  * @param  None
  * @retval None
  */
void PendSV_Handler(void)
{
}

/**
  * @brief  This function handles SysTick Handler.
  * @param  None
  * @retval : None
  */
void SysTick_Handler(void)
{
	TimingDelay_Count();	    //在S<span style="font-family: Arial, Helvetica, sans-serif;">ysTick.c文件里</span>

}

/******************************************************************************/
/*                 STM32F10x Peripherals Interrupt Handlers                   */
/*  Add here the Interrupt Handler for the used peripheral(s) (PPP), for the  */
/*  available peripheral interrupt handler's name please refer to the startup */
/*  file (startup_stm32f10x_xx.s).                                            */
/******************************************************************************/

/**
  * @brief  This function handles PPP interrupt request.
  * @param  None
  * @retval None
  */
/*void PPP_IRQHandler(void)
{
}*/

/**
  * @}
  */ 


/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/

#include "stm32f10x.h"
#include "SysTick.h"

extern __IO u32 TimingDelay;


int main(void)
{	
	
	SysTick_Init();

	SysTick->CTRL |=  SysTick_CTRL_ENABLE_Msk;  //使能滴答定时器
	Delay(10000);   
        SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
	

}

0.00355199 - 0.00005228 = 0.00349971（s） 约等于DAB，与TimingDelay几乎一致。