目的说明

在Windows下C语言实现高精度计时功能和高精度延时微秒级别

环境说明

Dev-C++ V5.11

一、高精度延时(微秒级别)

void vDelayUS(u32 usDelay)
{
    LARGE_INTEGER startTick = {0}, curTick = {0}, countFQR = {0};
    u64 delayTick = 0;


    QueryPerformanceFrequency(&countFQR); /* 获取高精度性能计数器的频率 */
    delayTick = (countFQR.QuadPart * usDelay) / 1000000; /* 延时时间 */
    QueryPerformanceCounter(&startTick);  /* 获取高精度计数器开始值 */
    while (1)
    {
        /* 获取高精度计数器值 */
        QueryPerformanceCounter(&curTick);  
        if (((u64)(curTick.QuadPart - startTick.QuadPart)) >= delayTick)
        {
            break;
        }
    }
}

二、测试例程

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>

int main(int argc, char *argv[]) 
{
    LARGE_INTEGER startTick = {0}, endTick = {0}, countFQR = {0};
    u64 startCounter = 0, endCounter = 0;
    u64 absTime = 0;
    double costTime = 0;

    
    QueryPerformanceFrequency(&countFQR); /* 获取高精度性能计数器的频率 */
    QueryPerformanceCounter(&startTick);  /* 获取高精度计数器开始值 */
    vOrgData_Handler();
    QueryPerformanceCounter(&endTick); /* 获取高精度计数器结束值 */

    startCounter = startTick.QuadPart * 1000000 / countFQR.QuadPart; /* 开始计数值us */
    endCounter   = endTick.QuadPart   * 1000000 / countFQR.QuadPart; /* 结束计数值us */
    
    printf("\r\n\r\n");
    printf("High Precision Timing Demo:\r\n");
    costTime = (double)(endTick.QuadPart - startTick.QuadPart) * 1000000.0 / countFQR.QuadPart;
    printf("countFQR:%lldHZ  start:%lld  end:%lld  CostTimes:%0.3fus\r\n", countFQR, startTick.QuadPart, endTick.QuadPart, costTime);
    printf("startCounter:%lld  endCounter:%lld  CostTimes:%uus\r\n", startCounter, endCounter, (endCounter - startCounter));



    QueryPerformanceCounter(&startTick);
    vDelayUS(200000);
    QueryPerformanceCounter(&endTick);

    printf("\r\n\r\n");
    printf("High Precision Delay Demo:\r\n");
    absTime = (endTick.QuadPart - startTick.QuadPart) * 1000000 / countFQR.QuadPart;//us
    printf("start:%lld  end:%lld  CostTimes:%lldus\r\n\r\n", startTick.QuadPart, endTick.QuadPart, absTime);




    printf("Compiler Date : %s  %s\r\n", __DATE__, __TIME__);
    while(1);
    return 0;
}

三、测试结果

High Precision Timing Demo:
countFQR:10000000HZ  start:430589299158  end:430589305471  CostTimes:631.300us
startCounter:43058929915  endCounter:43058930547  CostTimes:632us


High Precision Delay Demo:
start:430589306518  end:430591306519  CostTimes:200000us

Compiler Date : Mar 21 2024  20:12:07