serial.c

linux下串口通信例子

/*****************************
 *      串口通信程序
 *****************************/
// ./serial -d 1 -v 115200 8N1N

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <stdlib.h>
#include "akiserial.h"

#define BUFSIZE 128

int main(int argc, char *argv[])
{
	int fd;
	int nread,i;
	char buff[BUFSIZE]={0};
	char commNumber,commParity,commStopbits,commFlowcontrol;
	int commSpeed,commDatabits;
	char param_cache[4]={0};

	for (i = 1; i < argc; i++) {
		if (argv[i] == NULL || *argv[i] == 0 || *argv[i] != '-') {
			continue;
		}
		if (strcmp (argv[i], "-d") == 0) {
			if (i + 1 >= argc) {
				printf ("No parameter specified with -d\n");
				exit (-1);
			}
			commNumber = atoi(argv[i+1]);
		}
		if (strcmp (argv[i], "-v") == 0) {
			if (i + 1 >= argc) {
				printf ("No parameter specified with -v\n");
				exit (-1);
			}
			commSpeed = atoi(argv[i+1]);

			strncpy(param_cache,argv[i+2],4);

			commDatabits=Hex2Char(param_cache[0]);
			commParity=param_cache[1];
			commStopbits=Hex2Char(param_cache[2]);
			commFlowcontrol=param_cache[3];
		}

		if (strcmp (argv[i], "-h") == 0) {
			printf("\n");
			printf("usage: serial [-d -v] [-i inputfile]\n");
			printf("\n");
			printf("-d 1			Serial device (1:COM1, 2:COM2, 3:COM3, ...)\n");
			printf("-v 115200 8N1N\n");
			printf("   [115200]		Bits per second (2400, 4800, 9600, 115200, 460800)\n");
			printf("   [8]			Data bits (5,6,7,8)\n");
			printf("   [N] 			Parity check (O:Odd, E:Even, N:None)\n");
			printf("   [1] 			Stop bits (1, 1.5, 2)\n");
			printf("   [N] 			Flow control(N:None, H:hard, X:Xon/Xoff)\n\n");
			printf("-i test.txt		Input file name(.txt)\n");
			exit (0);
		}
	}

	if((fd=open_port(fd,commNumber))<0) {
		perror("open_port error");
		return;
	}

	if((i=set_opt(fd,commSpeed,commDatabits,commParity,commStopbits))<0) {
		perror("set_opt error");
		return;
	}

	printf("fd=%d\n",fd);


	while(1) {
		bzero(buff,BUFSIZE);
		nread=read(fd,buff,BUFSIZE);
		printf("nread=%d,%s\n",nread,buff);

		printf("Input data:");
		bzero(buff,BUFSIZE);
		scanf("%s",&buff);
		write(fd,buff,strlen(buff));
		//sleep(1);
	}

	close(fd);

	return 0;
}