STM32F4(用SysTick实现精确测量程序运行的时间)

转载来源：STM32F4(用SysTick实现精确测量程序运行的时间)
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2 R7 ]3 j3 F0 h1 v5 _8 `0 VGitHub仓库：http://github.com/XinLiGitHub/STM32F4xx_MeasureTime_Example
PS：博文不再更新，后续更新会在GitHub仓库进行。
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      在实际的项目开发过程中，常常遇到需要得到一段代码的运行时间，通常的方法是用示波器来测量，这篇博文将用SysTick来实现精确测量程序运行的时间。STM32F4的内核定时器SysTick是一个24位的定时器，需要注意最大的测量时间。
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5 C4 ]. P, l; H4 o! Y; Z8 |+ Y6 X; _1，开发环境
! g& e# ]$ X+ y- _- i      1，固件库：STM32F4xx_DSP_StdPeriph_Lib_V1.8.0
      2，编译器：ARMCC V5.06
      3，IDE：Keil uVision5
4 s; V4 X4 w2 F      4，操作系统：Windows 10 专业版

2，程序源码
      MeasureTime.h文件

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1. /**
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2.   ******************************************************************************
   
3.   * @file    MeasureTime.h
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4.   * @author  XinLi
   
5.   * @version v1.0
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6.   * @date    24-October-2017
   
7.   * @brief   Measure program run time module.
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8.   ******************************************************************************
   
9.   * @attention
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10.   *
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11.   * <h2><center>Copyright © 2017 XinLi</center></h2>
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12.   *
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13.   * This program is free software: you can redistribute it and/or modify
    
14.   * it under the terms of the GNU General Public License as published by
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15.   * the Free Software Foundation, either version 3 of the License, or
    
16.   * (at your option) any later version.
    
17.   *
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18.   * This program is distributed in the hope that it will be useful,
    
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
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20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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21.   * GNU General Public License for more details.
    
22.   *
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23.   * You should have received a copy of the GNU General Public License
    
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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25.   *
    
26.   ******************************************************************************
    
27.   */
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28. 
    
29. #ifndef __MEASURETIME_H
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30. #define __MEASURETIME_H
    
31. 
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32. #ifdef __cplusplus
    
33. extern "C" {
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34. #endif
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35. 
    
36. /* Header includes -----------------------------------------------------------*/
    
37. #include "stm32f4xx.h"
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38. 
    
39. /* Macro definitions ---------------------------------------------------------*/
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40. /* Type definitions ----------------------------------------------------------*/
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41. /* Variable declarations -----------------------------------------------------*/
    
42. /* Variable definitions ------------------------------------------------------*/
    
43. /* Function declarations -----------------------------------------------------*/
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44. /* Function definitions ------------------------------------------------------*/
    
45. 
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46. /**
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47.   * @brief  Start measure time.
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48.   * @param  None.
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49.   * @return None.
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50.   */
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51. __STATIC_INLINE void MeasureTimeStart(void)
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52. {
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53.   SysTick->CTRL |= SysTick_CLKSource_HCLK;  /* Set the SysTick clock source. */
    
54.   SysTick->LOAD  = 0xFFFFFF;                /* Time load (SysTick-> LOAD is 24bit). */
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55.   SysTick->VAL   = 0xFFFFFF;                /* Empty the counter value. */
    
56.   SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; /* Start the countdown. */
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57.   __nop();                                  /* Waiting for a machine cycle. */
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58. }
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59. 
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60. /**
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61.   * @brief  Stop measure time.
    
62.   * @param  [in] clock: System clock frequency(unit: MHz).
    
63.   * @return Program run time(unit: us).
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64.   */
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65. __STATIC_INLINE double MeasureTimeStop(uint32_t clock)
    
66. {
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67.   uint32_t count = SysTick->VAL;             /* Read the counter value. */
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68.   SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; /* Close counter. */
    
69.   
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70.   double time = 0.0;
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71.   
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72.   if(clock > 0)
    
73.   {
    
74.     time = (double)(0xFFFFFF - count) / (double)clock; /* Calculate program run time. */
    
75.   }
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76.   
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77.   return time;
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78. }
    
79. 
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80. #ifdef __cplusplus
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81. }
    
82. #endif
    
83. 
    
84. #endif /* __MEASURETIME_H */
    

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      main.c文件
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1. /**
   
2.   ******************************************************************************
   
3.   * @file    main.c
   
4.   * @author  XinLi
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5.   * @version v1.0
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6.   * @date    24-October-2017
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7.   * @brief   Main program body.
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8.   ******************************************************************************
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9.   * @attention
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10.   *
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11.   * <h2><center>Copyright © 2017 XinLi</center></h2>
    
12.   *
    
13.   * This program is free software: you can redistribute it and/or modify
    
14.   * it under the terms of the GNU General Public License as published by
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15.   * the Free Software Foundation, either version 3 of the License, or
    / E% y6 N5 a2 u/ ~
16.   * (at your option) any later version.
    
17.   *
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18.   * This program is distributed in the hope that it will be useful,
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19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
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20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
21.   * GNU General Public License for more details.
    
22.   *
    
23.   * You should have received a copy of the GNU General Public License
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24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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25.   *
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26.   ******************************************************************************
    
27.   */
    
28. 
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29. /* Header includes -----------------------------------------------------------*/
    
30. #include "main.h"
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31. #include "MeasureTime.h"
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32. 
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33. /* Macro definitions ---------------------------------------------------------*/
    
34. /* Type definitions ----------------------------------------------------------*/
    
35. /* Variable declarations -----------------------------------------------------*/
    
36. /* Variable definitions ------------------------------------------------------*/
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37. static __IO double runTime = 0.0;
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38. 
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39. /* Function declarations -----------------------------------------------------*/
    
40. __STATIC_INLINE void delay_1us(void);
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41. 
    
42. /* Function definitions ------------------------------------------------------*/
    
43. 
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44. /**
    
45.   * @brief  Main program.
    
46.   * @param  None.
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47.   * @return None.
    
48.   */
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49. int main(void)
    
50. {
    
51.   for(;;)
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52.   {
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53.     MeasureTimeStart();
    
54.     delay_1us();
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55.     runTime = MeasureTimeStop(84);
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56.   }
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57. }
    
58. 
    
59. /**
    
60.   * @brief  One microsecond delay.
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61.   * @param  None.
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62.   * @return None.
    
63.   */
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64. __STATIC_INLINE void delay_1us(void)
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65. {
    
66.   __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
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67.   __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
    
68.   __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
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69.   __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
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70.   __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
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71.   __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
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72.   __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
    
73.   __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
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74.   __nop(); __nop(); __nop(); __nop();
    
75. }
    

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我看根本就没用库

ddllxxrr 发表于 2018-2-2 13:55
4 e- X* o  L) S$ y( Z我看根本就没用库

1 q. X4 W$ a' L0 T7 W寄存器的定义也属于库的一部分啊。

XinLiYF 发表于 2018-2-2 19:52
* B/ g6 j, j$ C- A寄存器的定义也属于库的一部分啊。

& h  b4 A. T# E0 D- T定一下地址就用库了，头次听说

耗时延时，没用SYSTICK  !!!???