请问如何判断延迟时间，内祥！

Question

想做个I2C通讯软件，现在基本框架已经搞定
 就是不知道怎么在VC中实现4.7us的延时，我又怎样
判断延时是否达到要求呀
  求高手指教！！！

Answer 1

http://community.csdn.net/Expert/topic/3623/3623519.xml?temp=.1909601

Answer 2

BOOL QueryPerformanceFrequency(          LARGE_INTEGER *lpFrequency
);ms-help://MS.MSDNQTR.2003FEB.2052/winui/winui/windowsuserinterface/windowing/timers/timerreference/timerfunctions/queryperformancefrequency.htm

Answer 3

QueryPerformanceFrequency
QueryPerformanceCount
精度比较高

Answer 4

http://xs.blogchina.com/article_117686.585707.html

Answer 5

CString strText;
LARGE_INTEGER n64StartCount={0},n64StopCount,n64Frequency = {0};
DWORD dwTotalTime = 0; QueryPerformanceCounter(&n64StartCount);
QueryPerformanceFrequency(&n64Frequency); //这里加入你的操作 QueryPerformanceCounter(&n64StopCount);
dwTotalTime = n64StopCount.LowPart - n64StartCount.LowPart;
if(dwTotalTime < 0)
{
dwTotalTime += 2^32;
}
float WastTime = (float)(n64StopCount.LowPart - n64StartCount.LowPart)
/(n64Frequency.LowPart + n64Frequency.HighPart * 2^32); strText.Format("时间消耗 %f",WastTime);
AfxMessageBox(strText);