gpio_test.c

1、将makefile中的 CROSS =/usr/local/arm/2.95.3/bin/arm-linux- CFLAGS+=-I/usr/local/src/2.4.18-rmk7/inc

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h> 
#include <errno.h> 
#include <unistd.h>
#include <linux/delay.h>
#include <sys/ioctl.h> 

#define DEVICE_GPIOTEST  "/dev/gpio"  //设备节点 

int main ( int argc , char * argv [ ] )
{
  	int fd; 
  	int val =-1; 

  	fd = open( DEVICE_GPIOTEST,O_RDONLY); //打开设备
  	if( fd < 0 )  { 
     		perror("can not open device!!!\n"); 
     		exit ( 1 ) ;
  	}
	
  	while ( 1 ) { 
     		printf(" please Select number to run program\n");
     		printf("1 : led on\n");
		printf("2 : led off\n");
     		scanf("%d", &val);

     		if(val ==1)
       		ioctl ( fd , 0 , 10 ); 
     		else if ( val ==2 )  {
        		close( fd ); 
			break;
     		}
   	}

   return 0;
}