我有一个程序, 我需要在 Windows 7/ 32 位计算机上以 10msec 速率 (100hz) 运行( 100hz ) 。 此中断程序可能会有一些最短的迟( 100uSec) 响应, 但不能长期漂移。 我有一个程序, 我已装入并使用 NtSetTimerRUT 将计时器设定为 10msec 分辨率, 然后使用 CreateTimerQuue/ CreateTimereQueTimer 函数创建一个计时器, 并有一个回调程序, 以切换 GPIO 针( 此时) - 生成预期的平方波, 只要我不在系统上做其他事情。 当我开始其他几个程序时, 我的平方波的精度会从窗口中跳出。 是否有办法在计时器中断时提高优先级水平( 或者我可以使用另一个计时器) 来产生更稳定的输出( perhaps the SMI)? 我的代码在下面,, 并且 使用 X86 检查了 Windows DDDK 管理员的设置环境 。

/*

Abstract:

Simple console test app for a 10mSec timer interrupt service

Enviroment:

Administrator Mode

*/


/* INCLUDES */

#include     <windows.h>
#include     <winioctl.h>
#include     <stdio.h>
#include     <string.h>
#include     <stdlib.h>
#include     <conio.h>
#include     <strsafe.h> 

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

#include     <winsock2.h>
#include     <mswsock.h>

#pragma warning(disable:4127)   // condition expression is constant

FARPROC pNtQueryTimerResolution;
FARPROC pNtSetTimerResolution;

static  HANDLE    NTDLLModuleHandle;
static  HINSTANCE hInpOutDll;

typedef         void  (   __stdcall  *lpOut32 )( short , short );
typedef  short        (   __stdcall  *lpInp32 )( short );
typedef  BOOL         (   __stdcall  *lpIsInpOutDriverOpen )( void );

//Some global function pointers (messy but fine for an example)
lpOut32              gfpOut32;
lpInp32              gfpInp32;
lpIsInpOutDriverOpen gfpIsInpOutDriverOpen;


void CALLBACK TimerProc(void* lpParameter,
    BOOLEAN TimerOrWaitFired);

// MAIN

VOID  __cdecl    main( void )
{
    ULONG ulMinRes = 0;
    ULONG ulMaxRes = 0;
    ULONG ulCurRes = 0;

    HANDLE phNewQueue;
    HANDLE phNewTimer;

    phNewQueue        = CreateTimerQueue( );

    NTDLLModuleHandle = LoadLibrary( "NTDLL.DLL" );

    if( NULL == NTDLLModuleHandle )
    {
        return;
    }

    // Get the function pointers,
    pNtQueryTimerResolution = GetProcAddress( NTDLLModuleHandle, "NtQueryTimerResolution" );
    pNtSetTimerResolution = GetProcAddress( NTDLLModuleHandle, "NtSetTimerResolution" );

    if( ( pNtQueryTimerResolution == NULL ) || ( pNtSetTimerResolution == NULL ) )
    {
        printf( "unable to link to ddl





" );
        return;
    }

    pNtQueryTimerResolution( &ulMinRes, &ulMaxRes, &ulCurRes );
    printf( "MMR:  %d   %d   %d
", ulMinRes, ulMaxRes, ulCurRes );

    ulMaxRes = 100000;
    pNtSetTimerResolution( ulMaxRes, TRUE, &ulCurRes );

    pNtQueryTimerResolution( &ulMinRes, &ulMaxRes, &ulCurRes );
    printf( "MMR:  %d   %d   %d
", ulMinRes, ulMaxRes, ulCurRes );

    //Dynamically load the DLL at runtime (not linked at compile time)
    hInpOutDll = LoadLibrary( "InpOut32.DLL" ); 
    if( hInpOutDll != NULL )
    { 
        gfpOut32 = ( lpOut32 )GetProcAddress( hInpOutDll, "Out32" );
        gfpInp32 = ( lpInp32 )GetProcAddress( hInpOutDll, "Inp32" );
        gfpIsInpOutDriverOpen
            = ( lpIsInpOutDriverOpen )GetProcAddress( hInpOutDll, "IsInpOutDriverOpen" );

        if( gfpIsInpOutDriverOpen( ) )
        {
            gfpOut32( 0xA01, 0x00 );
        }
        else
        {
            printf( "unable to create timer system





" );
            return;
        }
    }

    CreateTimerQueueTimer( &phNewTimer, phNewQueue, TimerProc, NULL, 0, 10, 
                       WT_EXECUTEINTIMERTHREAD );

    do
    {
        Sleep( 1 );
    } while( TRUE );
}

void CALLBACK TimerProc(void* lpParameter,
    BOOLEAN TimerOrWaitFired)
{
    WORD wData;    

    UNREFERENCED_PARAMETER  ( lpParameter );
    UNREFERENCED_PARAMETER  ( TimerOrWaitFired );

    wData = gfpInp32( 0xA00 );
    wData++;
    gfpOut32( 0xA00, wData );
}