时间标记服务(有问题).txt

nios范例（含源代码）

#include <stdio.h>
#include "system.h"
#include "alt_types.h"
#include "sys/alt_timestamp.h"    //时间标记服务头文件

void func1(void)
{
  int cnt=10000;
  while(cnt--);
}

int main()
{
  alt_u32 time1,time2;
  if(alt_timestamp_start()<0)//开启时间标记服务
    {
      printf("cant statr timestmp\n");
    }
    
  time1=alt_timestamp();
  func1();
  time2=alt_timestamp();
  printf("func1 need %u\n",(unsigned int)(time2-time1));
  //测系统的频率
  printf("the freq of timer is %u\n",(unsigned int)alt_timestamp_freq());
  return(0);
}