nios II--实验3——led 100M软件部分

软件开发

参照实验二（led），该实验与实验二（led）的不同之处在于系统的时钟由50M提成为100M。运行结果，在调试窗口输出Hello from Nios II!，并且板上的四个LED灯流动显示，表明测试成功！通过此实验证实，板子支持的运行频率足够高，可达到100M。

实验代码

/* * "Hello World" example. * * This example prints 'Hello from Nios II' to the STDOUT stream. It runs on * the Nios II 'standard', 'full_featured', 'fast', and 'low_cost' example * designs. It runs with or without the MicroC/OS-II RTOS and requires a STDOUT * device in your system's hardware. * The memory footprint of this hosted application is ~69 kbytes by default * using the standard reference design. * * For a reduced footprint version of this template, and an explanation of how * to reduce the memory footprint for a given application, see the * "small_hello_world" template. * */ #include "system.h" #include "altera_avalon_pio_regs.h" #include <stdio.h> #include <unistd.h> int main() { int i; printf("Hello from Nios II!\n"); while(1) { for( i=0; i<4; i++ ) { IOWR_ALTERA_AVALON_PIO_DATA( LED_PIO_BASE, 1<<i ); usleep( 1000000 );//each one 0.5s delay } } return 0; }