/* *	Description:  *		example for set serial interface: RS-485. * */ #include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>int main(void){	int type, dip_sw, i;	int fd = open("/dev/ttyS4",O_RDWR);		/*get serial interface*/	if(ioctl(fd, 0xe001, &type) == 0)		printf("UART Type:%d\n",type);			/*set serial interface to RS-485*/	type = 485;	if(ioctl(fd, 0xe002, &type) == 0)		printf("set UART type:%d\n", type);	close(fd);	return 0;}