shutdown.c

基于linux和s3c2440的gpio驱动程序

//written by bcng xiyong,2007-7-1
//set gpj4 to zero to give a kill signal to chip ltc2950

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

#define GPJCON 0x560000d0
#define GPJ4 0x4
int main( )
{
   int fd;
   unsigned long  p[2];
   fd=open("/dev/gpio",O_RDWR | O_NOCTTY);
   if (fd < 0)
        {
                printf("can not open gpio!\n");
		return -1;
        }
   p[0]=GPJCON;  //GPJCON
   p[1]=GPJ4;
   write(fd,p,0x0);	   
   close(fd);
}