test.c

采用gpio口来控制串口扩展芯片的驱动和测试程序

#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|O_NOCTTY);
    
      fd = open("/dev/gpio", O_RDWR|O_NOCTTY);  
	printf("the file value of gpio is %d \n",fd);
/*	if ((fd = open("/dev/gpio", O_RDWR)) < 0)
		{
			printf("Device gpio open error !\n");
			exit(-1);
		}  

    */
	printf("The Command1 is: %d\n",argc);
	printf("The Command2 is: %c\n",*argv[2]);
	char tmp=*argv[2];
	printf("tmp=%c\n",tmp);
//	printf("*argv[2] is: %c\n",*argv[2]);


switch(tmp)
{    
    case 'a':  
         printf("case0\n");    
	ioctl(fd, IOCTL_GPIO_INIT, 0);
	 printf("end of case0\n");
	break;
    case 'b':
        printf("case1\n");
	int arg_w=(int)(*argv[3])-48;
	ioctl(fd, IOCTL_GPIO_WRITE, arg_w);
	printf("arg_w= %d \n",arg_w);
//	printf("res= %d \n",res);
	printf("end of case1\n");
	break;
    case 'c':
        printf("case2\n");
	int res=ioctl(fd, IOCTL_GPIO_READ, 4);
	printf("res= %d \n",res);
	printf("end of case2\n");
	break;
    default:
        break;
}
// IOCTL_GPIO_INIT			
// IOCTL_GPIO_WRITE			
//IOCTL_GPIO_READ			

	
    close(fd);    

}