跑NIOS自带的uc/os tutorial

在SDRAM上跑NIOS自带的uc/os tutorial工程模块，编译时发生以下的错误：

make -s all includes
Creating generated_app.mk...
Creating system.h...
2008-9-23 10:32:54 - (严重) generate: java.lang.IllegalStateException: java.lang.IllegalStateException: java.lang.NumberFormatException: empty String
make[1]: *** [system_description/../obj/system.h-t] Error 1
make: *** [system_project] Error 2
Build completed in 11.922 seconds

去网上搜了一下，发现原因是没有加定时器，于是回去重新加了定时器，搞掂~

另外，NIOS IDE自带的演示程序hello_led被我更改以后变成如下的代码：

#include
#include "includes.h"
#include "system.h"
#include "alt_types.h"
#include "altera_avalon_pio_regs.h"

#define   TASK_STACKSIZE       2048
OS_STK    task1_stk[TASK_STACKSIZE];
OS_STK    task2_stk[TASK_STACKSIZE];

#define TASK1_PRIORITY      1
#define TASK2_PRIORITY      2

void task1(void* pdata)
{
alt_u8 led = 0x2;
alt_u8 dir = 0;
volatile int i;
    
while (1)
{
   if (led & 0x81)
    {
      dir = (dir ^ 0x1);
    }

    if (dir)
    {
      led = led >> 1;
    }
    else
    {
      led = led << 1;
    }
    IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE, led);

    i = 0;
    while (i<200000)
      i++;
    OSTimeDlyHMSM(0, 0, 3, 0);
}
}

void task2(void* pdata)
{
while (1)
{
    printf("Hello from task2\n");
    OSTimeDlyHMSM(0, 0, 3, 0);
}
}

int main(void)
{

OSTaskCreateExt(task1,
                  NULL,
                  (void *)&task1_stk[TASK_STACKSIZE],
                  TASK1_PRIORITY,
                  TASK1_PRIORITY,
                  task1_stk,
                  TASK_STACKSIZE,
                  NULL,
                  0);
             
              
OSTaskCreateExt(task2,
                  NULL,
                  (void *)&task2_stk[TASK_STACKSIZE],
                  TASK2_PRIORITY,
                  TASK2_PRIORITY,
                  task2_stk,
                  TASK_STACKSIZE,
                  NULL,
                  0);
OSStart();
return 0;
}

该程序是在控制台打印字符串的同时控制流水灯。运行之后发现流水灯移动很缓慢，于是改了OSTimeDlyHMSM(0, 0, 3, 0)，把其中的参数改为0,0,0,10。这个函数的作用是按小时、分、秒、毫秒来定义时间，任务调用OSTimeDlyHMSM函数后，一旦规定的时间它马上就会处于就绪态。之所以更改之前的流水灯执行很慢，就是因为等待时间为3秒，流水灯每三秒才移动一次，更改之后变为10ms即可就绪，因此流水灯就可以顺畅的移动起来了。