nios ii小实验——timer

来源：互联网发布：天津网络推广外包编辑：程序博客网时间：2024/06/05 10:11

timer是软核里的计时器。

1.添加nios ii系统

加入nios ii processor, ram, jtag, timer,，注意连线。图例中pio,spi都不用添加。

2.实例化qsys

module work(CLOCK_50,KEY);input CLOCK_50;input [3:0] KEY;wire clk, rst;assign clk = CLOCK_50;assign rst = KEY[3];nios_II u0 (        .clk_clk        (clk),        .reset_reset_n  (rst)    ); endmodule

3.Eclipse

可见 http://blog.csdn.net/moon9999/article/details/69938526

在软核中写入如下代码

#include <stdio.h>#include "stdlib.h"#include "system.h"#include "sys/alt_timestamp.h"#include "alt_types.h"void func1(void){    int cnt=1000;    while(cnt--);}void func2(void){    int cnt=2000;    while(cnt--);}int main(){  printf("step 1 is ok\n");  alt_timestamp_start();  alt_u32 time1, time2,time3;  time1=alt_timestamp();  printf("time is %ld\n",time1);  func1();  time2=alt_timestamp();  printf("time is %ld\n",time2);  func2();  time3=alt_timestamp();  printf("time is %ld\n",time3);  printf("系统时钟频率是 %ld Hz\n", alt_timestamp_freq());  return 0;}

函数的作用：

alt_timestamp_start()：开启计时器

alt_timestamp()：戳取时间点

alt_timestamp_freq()：获取系统频率

注意修改bsp

4.运行程序

运行结果如下

0 0