mini2440 按键 实验 （二）

whonex

实验目的：按键控制led灯

实验环境： mini2440（arm920t）

工具： ads1.2 h-jtag1.0 

步骤：

1.在ads中新建key工程，添加文件init.s main.c如下

init.s

1.     area init,code,readonly
2. start
3.     ldr sp,=4096
4.     import main
5.     bl main
6.     end

main.c

1. #define rGPBCON (*((volatile unsigned *)0x56000010))
   
2. #define rGPBDATA (*((volatile unsigned *)0x56000014))
   
3. 
   
4. #define rGPGCON (*((volatile unsigned *)0x56000060))
   
5. #define rGPGDATA (*((volatile unsigned *)0x56000064))
   
6. 
   
7. #define LED1_ON rGPBDATA &=(~(1<<5))
   
8. #define LED2_ON rGPBDATA &=(~(1<<6))
   
9. #define LED3_ON rGPBDATA &=(~(1<<7))
   
10. #define LED4_ON rGPBDATA &=(~(1<<8))
    
11. 
    
12. #define LED1_OFF rGPBDATA |=(1<<5)
    
13. #define LED2_OFF rGPBDATA |=(1<<6)
    
14. #define LED3_OFF rGPBDATA |=(1<<7)
    
15. #define LED4_OFF rGPBDATA |=(1<<8)
    
16. 
    
17. 
    
18. void delay(int i)
    
19. {
    
20.     while(i--);
    
21. }
    
22. 
    
23. int main()
    
24. {
    
25.     rGPBCON = 0x15400;
    
26.     rGPGCON = 0x2882;
    
27.     LED1_OFF;
    
28.     LED2_OFF;
    
29.     LED3_OFF;
    
30.     LED4_OFF;
    
31. 
    
32.     while(1)
    
33.     {
    
34.         if((rGPGDATA&=(1<<0)) == 0)
    
35.         {    
    
36.             delay(100);
    
37.             if((rGPGDATA&=(1<<0)) == 0)
    
38.             {
    
39.                 LED1_ON;
    
40.                 delay(100000);
    
41.             }
    
42.         }
    
43.         if((rGPGDATA&=(1<<3)) == 0)
    
44.         {    
    
45.             delay(100);
    
46.             if((rGPGDATA&=(1<<3)) == 0)
    
47.             {
    
48.                 LED2_ON;
    
49.                 delay(100000);
    
50.             }
    
51.         }
    
52.         if((rGPGDATA&=(1<<5)) == 0)
    
53.         {    
    
54.             delay(100);
    
55.             if((rGPGDATA&=(1<<5)) == 0)
    
56.             {
    
57.                 LED3_ON;
    
58.                 delay(100000);
    
59.             }
    
60.         }
    
61.         if((rGPGDATA&=(1<<6)) == 0)
    
62.         {
    
63.             delay(100);
    
64.             if((rGPGDATA&=(1<<6)) == 0)
    
65.             {
    
66.                 LED4_ON;
    
67.                 delay(100000);
    
68.             }
    
69.         }
    
70.         
    
71.         
    
72.         LED1_OFF;
    
73.         LED2_OFF;
    
74.         LED3_OFF;
    
75.         LED4_OFF;
    
76.     }
    
77.     return 0;
    
78. }

2.ADS AXD H-JTAG的配置同led程序。

备注 ：

    判断按键是否按下时，通过延时一段时间做第二次判断，实现按键去抖。