研讀"如何自己用SOPC Builder建立一個能在DE2-70上跑μC/OS-II的Nios II系統?"裡面的C

 1 #include <stdio.h>
 2 #include "includes.h"
 3 #include "system.h" 
 4 #include <io.h> 
 5 
 6  /* Definition of Task Stacks */
 7  #define   TASK_STACKSIZE       2048
 8 OS_STK    task1_stk[TASK_STACKSIZE];
 9 OS_STK    task2_stk[TASK_STACKSIZE]; 
10 
11  /* Definition of Task Priorities */ 
12 
13  #define TASK1_PRIORITY      1
14  #define TASK2_PRIORITY      2 
15 
16  /* Prints "Hello World" and sleeps for three seconds */
17 void task1(void* pdata)
18 {
19   while (1)
20   { 
21     printf("Hello uCOS-II\n");
22     OSTimeDlyHMSM(0, 0, 3, 0);
23   }
24 }
25  /* Prints "Hello World" and sleeps for three seconds */
26 void task2(void* pdata)
27 {
28   unsigned int i;
29   while (1)
30   { 
31     // read switch
32      i = IORD(PIO_SW_BASE, 0);   
33     // write ledr
34      IOWR(PIO_LEDR_BASE, 0, i);
35   }
36 }
37  /* The main function creates two task and starts multi-tasking */
38  int main(void)
39 {
40   OSTaskCreateExt(task1,
41                   NULL,
42                   (void *)&task1_stk[TASK_STACKSIZE-1],
43                   TASK1_PRIORITY,
44                   TASK1_PRIORITY,
45                   task1_stk,
46                   TASK_STACKSIZE,
47                   NULL,
48                   0);
49   OSTaskCreateExt(task2,
50                   NULL,
51                   (void *)&task2_stk[TASK_STACKSIZE-1],
52                   TASK2_PRIORITY,
53                   TASK2_PRIORITY,
54                   task2_stk,
55                   TASK_STACKSIZE,
56                   NULL,
57                   0);
58   OSStart();
59   return 0;
60 }

1. OSTimeDlyHMSM函數
   函數說明：INT8U OSTimeDlyHMSM(INT8U hours, INT8U minutes, INT8U seconds, INT16U milli)
2.IORD與IOWR(定義在io.h)
   函數說明I. IORD(BASE, REGNUM) II. IOWR(BASE, REGNUM, DATA)26 void task2(void* pdata)
27 {
28   unsigned int i;
29   while (1)
30   { 
31     // read switch
32      i = IORD(PIO_SW_BASE, 0);   
33     // write ledr
34      IOWR(PIO_LEDR_BASE, 0, i);
35   }
36 }

這是透過IORD函數讀去DE2-70板子上的SW狀態到i這個定義裡面( i = IORD(PIO_SW_BASE, 0);)其中PIO_SW_BASE的定義是在system.h裡面有定義，再透過IOWR把i寫入RED LED裡面
PIO_LEDR_BASE一樣定義在system.h裡面
其他部分還在研究~~~