at_test.c

来自「采用gpio口来控制串口扩展芯片的驱动和测试程序」· C语言 代码 · 共 51 行

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

#define IOCTL_GPIO_INIT			1
#define IOCTL_GPIO_WRITE			2
#define IOCTL_GPIO_READ			3

int main(int argc, char *argv[])
{
	int fd;
	
	printf("Test gpio port\n");

    fd = open("/dev/gpio", O_RDWR);
     
     printf("fd =%d\n",fd);
    printf ("Open gpio OK?\n");
//  argc=0;
    
	printf("The Command1 is: %d\n",argc);
	printf("The Command2 is: %c\n",*argv[2]);
	
switch(argc)
{
    case 0:
	ioctl(fd, IOCTL_GPIO_INIT, 0);
	break;
    case 1:
	ioctl(fd, IOCTL_GPIO_WRITE, 2);
	break;
    case 2:
	ioctl(fd, IOCTL_GPIO_READ, 4);
	break;
    default:
        break;
}
// IOCTL_GPIO_INIT			
// IOCTL_GPIO_WRITE			
//IOCTL_GPIO_READ			

	
    close(fd);    

}