/*
 * 聲明：本范例源于書籍‘NiosII軟件架構解析’
 * 作者：蔡偉綱
 * 博客地址： http://NiosII.cublog.cn 
 *
 * 一、功能: Timestamp驅動演示代碼.
 * 二、該源碼需要硬件開發板的支持,因為ISS對Timestamp定時器的模擬還不夠精確
 *     如果將該源碼運行于ISS模式下,將得不到精確的結果;
 * 三、運行前提:
 *    1. 選擇包含JTAG_UART和定時器的NiosII系統(ptf文件);
 *	     其中的定時器要求:
 *        (1) 具備可寫的period寄存器;
 *        (2) 具備可讀的snapshot寄存器;
 *    2. 在系統庫屬性中完成下面的配置:
 *        (1) 將stdout映射到JTAG_UART;
 *        (2) 將定時器映射為Timestamp時鐘;
 */
#include <stdio.h>
#include "system.h"
#include "sys/alt_timestamp.h"
#include "alt_types.h"
#include "priv/alt_busy_sleep.h"

void func1(void)
{
  alt_busy_sleep(1000);//Unit: us;
}

void func2(void)
{
  alt_busy_sleep(5000);//Unit: us;
}

int main (void)
{
  alt_u32 time1;
  alt_u32 time2;
  alt_u32 time3;
  
  if(alt_timestamp_start() < 0)
  {
    printf ("No timestamp device available\n");
  }
  else
  {
    time1 = alt_timestamp();
    func1(); /* first function to monitor */
    time2 = alt_timestamp();
    func2(); /* second function to monitor */
    time3 = alt_timestamp();
    alt_u32 Elapsed_Time1 = (time2-time1)/(ALT_CPU_FREQ/1000000);
    printf ("Elapsed time in func1 = %d us\n", Elapsed_Time1);
    alt_u32 Elapsed_Time2 = (time3-time2)/(ALT_CPU_FREQ/1000000);
    printf ("Elapsed time in func2 = %d us\n", Elapsed_Time2);
  }
  return 0;
}