STM32簡單的LED流水燈程序

any_wind

1. //0x4002 1000 - 0x4002 13FF 復(fù)位和時鐘控制(RCC)
   
2. #define RCC_BASE        0x40021000
   
3. #define RCC_APB2ENR        (RCC_BASE+0x18)
   
4. //LED接在GPIOF上，是APB2上的外設(shè)，是RCC_APB2ENR寄存器的第7位
   
5. 
   
6. //APB20x4001 1c00 GPIO端口F
   
7. #define GPIOF_BASE        0x40011c00
   
8. #define GPIOF_CHL        (0x000+GPIOF_BASE)
   
9. #define GPIOF_CHR        (0x004+GPIOF_BASE)
   
10. #define GPIOF_IDR        (0x008+GPIOF_BASE)
    
11. #define GPIOF_ODR         (0x00c+GPIOF_BASE)
    
12. #define GPIOF_BSRR         (0x010+GPIOF_BASE)
    
13. #define GPIOF_BRR        (0x014+GPIOF_BASE)
    
14. #define GPIOF_LCKR        (0x014+GPIOF_BASE)
    
15. 
    
16. void delay(int num)
    
17. {
    
18.     int i,j;
    
19.     for(i=0;i<num;i++)
    
20.         for(j=0;j<5000;j++)
    
21.             ;    
    
22. }
    
23. 
    
24. int main(void)
    
25. {
    
26.     *(unsigned int *)RCC_APB2ENR=1<<7;//開gpiof時鐘
    
27.     //設(shè)置gpiof的管腳為開漏輸出，電平為0，外部電流灌入6，7，8，9管腳
    
28.     //設(shè)置成開漏輸出，頻率無所謂，那么cny為0101,mode為0101
    
29.     *(unsigned int *)GPIOF_CHL=0x55555555;
    
30.     *((unsigned int *)GPIOF_CHR)=0x55555555;
    
31.     *((unsigned int *)GPIOF_ODR)=0xffff;
    
32.     while(1)
    
33.     {
    
34.         *((unsigned int *)GPIOF_BSRR)=1<<22;
    
35.         delay(200);
    
36.         *((unsigned int *)GPIOF_BSRR)=1<<23;
    
37.         delay(200);
    
38.         *((unsigned int *)GPIOF_BSRR)=1<<24;
    
39.         delay(200);
    
40.         *((unsigned int *)GPIOF_BSRR)=1<<25;
    
41.         delay(200);
    
42.         *((unsigned int *)GPIOF_ODR)=0xffff;
    
43.         delay(200);
    
44.     }    
    
45. }