获取STM32代码运行时间的技巧

#include "systick.h"
/* SystemFrequency / 1000    1ms中断一次 * SystemFrequency / 100000     10us中断一次 * SystemFrequency / 1000000 1us中断一次 */
#define SYSTICKPERIOD                    0.000001#define SYSTICKFREQUENCY            (1/SYSTICKPERIOD)
/**  * @brief  读取SysTick的状态位COUNTFLAG  * @param  无  * @retval The new state of USART_FLAG (SET or RESET).  */static FlagStatus SysTick_GetFlagStatus(void) {    if(SysTick->CTRL&SysTick_CTRL_COUNTFLAG_Msk)     {        return SET;    }    else    {        return RESET;    }}
/**  * @brief  配置系统滴答定时器 SysTick  * @param  无  * @retval 1 = failed, 0 = successful  */uint32_t SysTick_Init(void){       /* 设置定时周期为1us  */    if (SysTick_Config(SystemCoreClock / SYSTICKFREQUENCY))     {         /* Capture error */         return (1);    }
    /* 关闭滴答定时器且禁止中断  */    SysTick->CTRL &= ~ (SysTick_CTRL_ENABLE_Msk | SysTick_CTRL_TICKINT_Msk);                                                      return (0);}
/**  * @brief   us延时程序,10us为一个单位  * @param    *        @arg nTime: Delay_us( 10 ) 则实现的延时为 10 * 1us = 10us  * @retval  无  */void Delay_us(__IO uint32_t nTime){         /* 清零计数器并使能滴答定时器 */      SysTick->VAL   = 0;      SysTick->CTRL |=  SysTick_CTRL_ENABLE_Msk;     
    for( ; nTime > 0 ; nTime--)    {     /* 等待一个延时单位的结束 */     while(SysTick_GetFlagStatus() != SET);    }
    /* 关闭滴答定时器 */    SysTick->CTRL &= ~ SysTick_CTRL_ENABLE_Msk;}

#ifndef __GPIO_H#define    __GPIO_H
#include "stm32f10x.h"
#define     LOW          0#define     HIGH         1
/* 带参宏，可以像内联函数一样使用 */#define TX(a)                if (a)    \                                            GPIO_SetBits(GPIOB,GPIO_Pin_0);\                                        else        \                                            GPIO_ResetBits(GPIOB,GPIO_Pin_0)void GPIO_Config(void);
#endif
#include "gpio.h"   
 /**  * @brief  初始化GPIO  * @param  无  * @retval 无  */void GPIO_Config(void){                /*定义一个GPIO_InitTypeDef类型的结构体*/        GPIO_InitTypeDef GPIO_InitStructure;
        /*开启LED的外设时钟*/        RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE);                                                                    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;             GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;         GPIO_Init(GPIOB, &GPIO_InitStructure);    }

#include "systick.h"#include "gpio.h"
/**  * @brief  主函数  * @param  无    * @retval 无  */int main(void){        GPIO_Config();
    /* 配置SysTick定时周期为1us */    SysTick_Init();
    for(;;)    {        TX(HIGH);         Delay_us(1);        TX(LOW);        Delay_us(100);    }     }

int main(void){        /* LED 端口初始化 */    GPIO_Config();
    /* 配置SysTick定时周期为1us */    SysTick_Init();
    for(;;)    {        TX(HIGH);         Delay_us(10);        TX(LOW);        Delay_us(100);    }     }

#include "timer.h"
/* SystemFrequency / 1000            1ms中断一次 * SystemFrequency / 100000     10us中断一次 * SystemFrequency / 1000000         1us中断一次 */
#define SYSTICKPERIOD                    0.000001#define SYSTICKFREQUENCY            (1/SYSTICKPERIOD)
/**  * @brief  定时器2的初始化,，定时周期1uS  * @param  无  * @retval 无  */void TIM2_Init(void){    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    /*AHB = 72MHz,RCC_CFGR的PPRE1 = 2，所以APB1 = 36MHz,TIM2CLK = APB1*2 = 72MHz */    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);        /* Time base configuration */             TIM_TimeBaseStructure.TIM_Period = SystemCoreClock/SYSTICKFREQUENCY -1;    TIM_TimeBaseStructure.TIM_Prescaler = 0;    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);        TIM_ARRPreloadConfig(TIM2, ENABLE);        /* 设置更新请求源只在计数器上溢或下溢时产生中断 */    TIM_UpdateRequestConfig(TIM2,TIM_UpdateSource_Global);     TIM_ClearFlag(TIM2, TIM_FLAG_Update);}
/**  * @brief   us延时程序,10us为一个单位  * @param    *        @arg nTime: Delay_us( 10 ) 则实现的延时为 10 * 1us = 10us  * @retval  无  */void Delay_us(__IO uint32_t nTime){         /* 清零计数器并使能滴答定时器 */      TIM2->CNT   = 0;      TIM_Cmd(TIM2, ENABLE);     
    for( ; nTime > 0 ; nTime--)    {     /* 等待一个延时单位的结束 */     while(TIM_GetFlagStatus(TIM2, TIM_FLAG_Update) != SET);     TIM_ClearFlag(TIM2, TIM_FLAG_Update);    }
    TIM_Cmd(TIM2, DISABLE);}

#include "stm32f10x.h"#include "Timer_Drive.h"#include "gpio.h"#include "systick.h"
TimingVarTypeDef Time;
int main(void){        TIM2_Init();        SysTick_Init();    SysTick_Time_Init(&Time);        for(;;)    {        SysTick_Time_Start();         Delay_us(1000);        SysTick_Time_Stop();    }     }