button-test.c~

来自「2440 下的5*5按键驱动程序.请参看具体代码内容.」· C~ 代码 · 共 37 行

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#define NOKEY 0

int main()
{
	int key7_fd;	
        char ret[2]; 
      
        key7_fd = open("/dev/key7", O_RDONLY);
	if(key7_fd<=0)
	{
                printf("open key7 device error!\n");
		return 0;
	}


	while(1)
	{	
                read(keys4_fd,ret,1);

		if (ret[0] != NOKEY)
		{
			printf("key = %c\n",ret[0]);
			
		}
		usleep(100000);
	}	
	close(keys4_fd);
	
        return 0;
}