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
