gpio_test.c

嵌入式LINUX的GPIO驱动和测试代码

//测试程序:
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define DEVICE_GPIOTEST                "/dev/gpiotest"

#define IOWRITE                1;
#define IOCLEAR                2;

int main()
{
        int fd;
        int val=-1;
        
        if( (fd=open(DEVICE_GPIOTEST,O_WRITE | O_NONBLOCK)) < 0 )
        {
                perror("can not open device");
                exit(1);
        }
        
        while(1)
        {
                printf("0:set,1:clear,2:quit;");
                scanf("%d",&val);
                
                if(val==0)
                        ioctl(fd,IOWRITE,0);
                else if(val==1)
                        ioctl(fd,IOCLEAR,0);
                else if(val==2)
                  {
                        close(fd);
                        exit(1);
                }
        }
}