void DelayUs(__int64 Us)
{
    LARGE_INTEGER CurrTicks, TicksCount;         QueryPerformanceFrequency(&TicksCount);
    QueryPerformanceCounter(&CurrTicks);         TicksCount.QuadPart = TicksCount.QuadPart * Us / 1000000i64;
    TicksCount.QuadPart  = CurrTicks.QuadPart;         while(CurrTicks.QuadPart0)
    {
        asm rdtsc
        asm mov DWORD PTR iCounter, EAX
        asm mov DWORD PTR (iCounter 4), EDX
    }
}    void TestDelay(void)
{ 
    _CPU_FREQ = CPU_Frequency(); 
    CpuDelayUs(1000000); 
}