uart.c

来自「The source code example of ARM9 developm」· C语言 代码 · 共 28 行

/*
 *	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;
}