Wince 微秒,毫秒延时函数

void delay_us(int n)
{
     LARGE_INTEGER litmp;
     LONGLONG QPart1,QPart2;
     double dfMinus, dfFreq, dfTim;

     QueryPerformanceFrequency(&litmp)
     dfFreq = (double)litmp.QuadPart;
     QueryPerformanceCounter(&litmp);
     QPart1 = litmp.QuadPart;
     do
     {
         QueryPerformanceCounter(&litmp);
         QPart2=litmp.QuadPart;
         dfMinus=(double)(QPart2-QPart1);
         dfTim=dfMinus/dfFreq;
     }while(dfTim <0.000001*n);
}


 void delay_ms(DWORD   tmp_time)
 {
     DWORD   start;
     DWORD   time_i=0;
     start=GetTickCount();
     while(time_i<=tmp_time){
        time_i=GetTickCount()-start;
     }
 }