linux 下简单的minicom

/*
 ============================================================================
 Name : testio.c
 Author :
 Version :
 Copyright : Your copyright notice
 Description : Hello World in C, Ansi-style
 ============================================================================
 */

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

#define BUFF_SIZE 1024

int set_option(int fd,int baudrate,int bits,char event,int stops);

int main(void) {
    unsigned char buff[BUFF_SIZE];
    ssize_t rd;
    fd_set rdset;
    int fd = open("/dev/ttyS0",O_RDWR|O_NOCTTY|O_NDELAY);
    if(fd < 0){
        //printf("open file test.txt fail!\n");
        perror("open file");
        return 1;
    }
    else
    {
        printf("opened serial port id %d\n",fd);
    }



    int fcr = fcntl(fd,F_SETLK,0);
    if(fcr < 0)
    {
        perror("ftcnl:");
    }
    else
    {
        printf("ftcnl %d\n",fcr);
    }

    if(isatty(STDIN_FILENO)==0)
    {
        printf("standard input is not a termial device");
    }
    else
    {
        printf("isatty\n");
    }

    set_option(fd,115200,8,'N',1);

    memset(buff,0,BUFF_SIZE);

    while(1)
    {
        FD_ZERO(&rdset);
        FD_SET(fd,&rdset);
        FD_SET(0,&rdset);

        if(select(fd+1,&rdset,NULL,NULL,NULL) < 0)
        {
            perror("select");
            break;
        }

        if(FD_ISSET(0,&rdset))
        {
            rd = read(fd,buff,BUFF_SIZE);
            if(rd > 0){
                buff[rd] = 0;
                //printf("after seek just read data %d bytes\n",rd);
                //printf("%s",buff);
                write(1,buff,rd);
            }
        }

        if(FD_ISSET(fd,&rdset))
        {
            rd = read(0,buff,BUFF_SIZE);
            if(rd > 0){
                buff[rd] = 0;
                //printf("after seek just read data %d bytes\n",rd);
                //printf("%s",buff);
                write(fd,buff,rd);
            }
        }
    }

    close(fd);

    return EXIT_SUCCESS;
}

int set_option(int fd,int baudrate,int bits,char event,int stops)
{
    struct termios newtio,oldtio;
    if(tcgetattr(fd,&oldtio) != 0)
    {
        perror("get attr");
        return -1;
    }

    bzero(&newtio,sizeof(newtio));
    newtio.c_cflag |= CLOCAL | CREAD;
    newtio.c_cflag &= ~CSIZE;
    switch(bits)
    {
        case 7: newtio.c_cflag |= CS7;
            break;
        case 8: newtio.c_cflag |= CS8;
            break;
    }

    switch(event)
    {
        case 'N': newtio.c_cflag &= ~PARENB;
            break;
        case 'O': newtio.c_cflag |= PARENB;
            newtio.c_cflag |= PARODD;
            newtio.c_cflag |= (INPCK | ISTRIP);
            break;
        case 'E': newtio.c_cflag |= PARENB;
             newtio.c_cflag |= ~PARODD;
            newtio.c_cflag |= (INPCK | ISTRIP);
            break;

    }

    switch(baudrate)
    {
        case 9600:
            cfsetispeed(&newtio,B9600);
            cfsetospeed(&newtio,B9600);
            break;
        case 115200:
        default:
            cfsetispeed(&newtio,B115200);
            cfsetospeed(&newtio,B115200);
            break;

    }

     if(stops == 1)
    {
        newtio.c_cflag &= ~CSTOPB;
    }
    else if(stops == 2)
    {
        newtio.c_cflag |= CSTOPB;
    }

    newtio.c_cc[VTIME] = 0;
    newtio.c_cc[VMIN] = 0;
       tcflush(fd,TCIFLUSH);

    if(tcsetattr(fd,TCSANOW,&newtio) != 0)
    {
        perror("set attr");
        return -1;
    }

    printf("set done!\n");
    return 0;

}

在ubuntu10.4下测试可用