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

#define DEVICE	"/dev/idr_gpio"

void delay(int time)
{
	int i;

	for (; time > 0; time-- )
		for ( i = 0; i < 0x50000; i++ );
}

int main(int argc,char **argv)
{
	int fd;
	int ret,i = 0;
	char buf[10] = {7,7,7,7,7,7,7,7,7};
	char rx_buf;
	
	fd = open(DEVICE,O_WRONLY | O_NONBLOCK );
	if ( fd < 0 )
	{
		printf("can't open device %s!\n",DEVICE);
		return -1;
	}
	while(1)
	{
		sleep(5);
		ret = write(fd,&buf[i],1);
		if ( ret < 0 ) 
		{
			fprintf(stderr,"fail to write %s\n", DEVICE);
			close(fd);
			return -1;
		}
		i++;
		if ( i == 10 )
			i = 0;
	}
#if 0
	ret = read(fd,&rx_buf,sizeof(buf));
	if ( ret < 0 ) 
	{
		fprintf(stderr,"fail to read %s\n", DEVICE);
		close(fd);
		return -1;
	}
	printf(" rx_buf = %d\n",rx_buf);
#endif
	
	close(fd);
	return 0;
}