Cubieboard 4 GPIO控制举例

蓝天-彭

#/bin/bash

mount -t debugfs debugfs /mnt
cd /mnt/sunxi_pinctrl

#set the PH9 pin as output port .If type "echo PH9 0 > function" ,set the PH9 pin as input port
echo PH9 1 > function   

#set the PH9 pin as low level
echo PH9 0 > data
sleep 1

#set the PH9 pin as high level
echo PH9 1 > data

echo PH8 1 > function
echo PH8 1 > data

@allen

补充其他gpio控制方法：
以控制　cc-a80 的uart4_tx为例子：
新建一个test.c

1. #include <ctype.h>
   
2. #include <string.h>
   
3. #include <stdlib.h>
   
4. #include <stdio.h>
   
5. #include <math.h>
   
6. #include <time.h>
   
7. #include <signal.h>
   
8. #include <sys/types.h>
   
9. #include <sys/stat.h>
   
10. #include <fcntl.h>
    
11. #include <sys/mman.h>
    
12. #include <sys/select.h>
    
13. #include <pthread.h>
    
14. #include <unistd.h>
    
15. #include <sched.h>
    
16. #include <errno.h>
    
17. 
    
18. 
    
19. #define SW_PORTC_IO_BASE  0x06000800
    
20. 
    
21. int main() {
    
22.         unsigned int * pc;
    
23.         int fd, i;
    
24.         char * ptr;
    
25.         unsigned int addr_start, addr_offset, PageSize, PageMask, data;
    
26.        
    
27.         PageSize = sysconf(_SC_PAGESIZE);
    
28.         PageMask = (~(PageSize-1));
    
29.         addr_start = SW_PORTC_IO_BASE & PageMask;
    
30.         addr_offset = SW_PORTC_IO_BASE & ~PageMask;
    
31.        
    
32.         fd = open("/dev/mem", O_RDWR);
    
33.         if(fd < 0) {
    
34.            perror("Unable to open /dev/mem");
    
35.            return(-1);
    
36.         }
    
37.        
    
38.         pc = mmap(0, PageSize*2, PROT_READ|PROT_WRITE, MAP_SHARED, fd, addr_start);
    
39.        
    
40.         if(pc == MAP_FAILED) {
    
41.            perror("Unable to mmap file");
    
42.            printf("pc:%lx\n", (unsigned long)pc);
    
43.            return(-1);
    
44.         }
    
45.         printf("PageSize:%8.8x\tPageMask:%8.8x\naddr_start:%8.8x\taddr_offset:%8.8x\n",PageSize,PageMask,addr_start,addr_offset);
    
46.         printf("pc:%8.8x\n", *(unsigned int *)pc);
    
47.         ptr = (char *)pc + addr_offset;
    
48. 
    
49.         //the PG12 is UART4-TX in the board ,set it as output port
    
50.         data = *(unsigned int *)(ptr+0xdc);
    
51.         data &= ~(7<<16);                        
    
52.         data |= 1<<16;                        
    
53.         *(unsigned int *)(ptr+0xdc) = data;
    
54. 
    
55.         //set it high level  
    
56.         data = *(unsigned int *)(ptr+0xe8);
    
57.         data |= 1<<12;                        
    
58.         *(unsigned int *)(ptr+0xe8) = data;
    
59.         //set it low level
    
60.         //data = *(unsigned int *)(ptr+0xe8);
    
61.         //data &= ~(1<<12);                        
    
62.         //*(unsigned int *)(ptr+0xe8) = data;
    
63. 
    
64.        
    
65.        
    
66.         return 0;
    
67.     }

复制代码

最后在板子上gcc test.c -o test。只看下注释理解用法。