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)  

{

for(; nCount != 0; 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.

  *

  *

© COPYRIGHT 2011 STMicroelectronics

  ******************************************************************************

  */

/* 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SysTick.c文件里

}

/******************************************************************************/

/*                 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****/

//main.c

#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。