赛灵斯zynq standalone 延时函数

void delay_ms(unsigned int mseconds)
{
  XTime tEnd, tCur;

  XTime_GetTime(&tCur);
  tEnd = tCur + (((XTime) mseconds) * (COUNTS_PER_SECOND / 1000));
  do
  {
    XTime_GetTime(&tCur);
  } while (tCur < tEnd);
}

void delay_us(unsigned int useconds)
{
  XTime tEnd, tCur;

  XTime_GetTime(&tCur);
  tEnd = tCur + (((XTime) useconds) * (COUNTS_PER_SECOND / 1000000));
  do
  {
    XTime_GetTime(&tCur);
  } while (tCur < tEnd);
}