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)
GitHub仓库:https://github.com/XinLiGitHub/STM32F4xx_MeasureTime_Example
PS:博文不再更新,后续更新会在GitHub仓库进行。
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。
1,开发环境
1,固件库:STM32F4xx_DSP_StdPeriph_Lib_V1.8.0
2,编译器:ARMCC V5.06
3,IDE:Keil uVision5
4,操作系统:Windows 10 专业版
2,程序源码
MeasureTime.h文件
- /**
- ******************************************************************************
- * @file MeasureTime.h
- * @author XinLi
- * @version v1.0
- * @date 24-October-2017
- * @brief Measure program run time module.
- ******************************************************************************
- * @attention
- *
- * <h2><center>Copyright © 2017 XinLi</center></h2>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- ******************************************************************************
- */
- #ifndef __MEASURETIME_H
- #define __MEASURETIME_H
- #ifdef __cplusplus
- extern "C" {
- #endif
- /* Header includes -----------------------------------------------------------*/
- #include "stm32f4xx.h"
- /* Macro definitions ---------------------------------------------------------*/
- /* Type definitions ----------------------------------------------------------*/
- /* Variable declarations -----------------------------------------------------*/
- /* Variable definitions ------------------------------------------------------*/
- /* Function declarations -----------------------------------------------------*/
- /* Function definitions ------------------------------------------------------*/
- /**
- * @brief Start measure time.
- * @param None.
- * @return None.
- */
- __STATIC_INLINE void MeasureTimeStart(void)
- {
- SysTick->CTRL |= SysTick_CLKSource_HCLK; /* Set the SysTick clock source. */
- SysTick->LOAD = 0xFFFFFF; /* Time load (SysTick-> LOAD is 24bit). */
- SysTick->VAL = 0xFFFFFF; /* Empty the counter value. */
- SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; /* Start the countdown. */
- __nop(); /* Waiting for a machine cycle. */
- }
- /**
- * @brief Stop measure time.
- * @param [in] clock: System clock frequency(unit: MHz).
- * @return Program run time(unit: us).
- */
- __STATIC_INLINE double MeasureTimeStop(uint32_t clock)
- {
- uint32_t count = SysTick->VAL; /* Read the counter value. */
- SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; /* Close counter. */
-
- double time = 0.0;
-
- if(clock > 0)
- {
- time = (double)(0xFFFFFF - count) / (double)clock; /* Calculate program run time. */
- }
-
- return time;
- }
- #ifdef __cplusplus
- }
- #endif
- #endif /* __MEASURETIME_H */
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main.c文件
- /**
- ******************************************************************************
- * @file main.c
- * @author XinLi
- * @version v1.0
- * @date 24-October-2017
- * @brief Main program body.
- ******************************************************************************
- * @attention
- *
- * <h2><center>Copyright © 2017 XinLi</center></h2>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- ******************************************************************************
- */
- /* Header includes -----------------------------------------------------------*/
- #include "main.h"
- #include "MeasureTime.h"
- /* Macro definitions ---------------------------------------------------------*/
- /* Type definitions ----------------------------------------------------------*/
- /* Variable declarations -----------------------------------------------------*/
- /* Variable definitions ------------------------------------------------------*/
- static __IO double runTime = 0.0;
- /* Function declarations -----------------------------------------------------*/
- __STATIC_INLINE void delay_1us(void);
- /* Function definitions ------------------------------------------------------*/
- /**
- * @brief Main program.
- * @param None.
- * @return None.
- */
- int main(void)
- {
- for(;;)
- {
- MeasureTimeStart();
- delay_1us();
- runTime = MeasureTimeStop(84);
- }
- }
- /**
- * @brief One microsecond delay.
- * @param None.
- * @return None.
- */
- __STATIC_INLINE void delay_1us(void)
- {
- __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
- __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
- __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
- __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
- __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
- __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
- __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
- __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop(); __nop();
- __nop(); __nop(); __nop(); __nop();
- }
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