com.c

来自「一个uclinux下进行网络数据处理,及串口读取,CGI配置」· C语言 代码 · 共 85 行

#include "com.h"
int opencommport(const char *commport,com_struct com)
{
    int fd,speed;
    struct termios newtio;
    fd = open(commport,O_RDWR|O_NOCTTY|O_NDELAY);
    if(fd==-1)
    {
        printf("open comm port error.\n"); 
        exit(-1);
    }
    tcgetattr(fd,&newtio);
    bzero(&newtio,sizeof(newtio));
    //setting c_cflag
    newtio.c_cflag |= (CLOCAL|CREAD);
    //setting parity
    if (strcmp(com.parity,"parityodd")==0)
    {
       newtio.c_cflag |=PARENB;
       newtio.c_cflag |=PARODD;
    }
    else if (strcmp(com.parity,"parityeven")==0)
    {
       newtio.c_cflag |=PARENB;
       newtio.c_cflag &=~PARODD;
    }
    else 
    {
       newtio.c_cflag &=~PARENB;
       newtio.c_cflag &=~PARODD;
    }
    //setting stopbits
    if (strcmp(com.stopbits,"stopbits2")==0)
      newtio.c_cflag |=CSTOPB;
    else
      newtio.c_cflag &=~CSTOPB;
    //setting databits
    newtio.c_cflag &=~CSIZE;
    if (strcmp(com.databits,"databits5")==0)
       newtio.c_cflag |=CS5;
    else if (strcmp(com.databits,"databits6")==0)
       newtio.c_cflag |=CS6;
    else if(strcmp(com.databits,"databits7")==0)
       newtio.c_cflag |=CS7;
    else
       newtio.c_cflag |=CS8;
    newtio.c_oflag|=OPOST;
    //setting c_iflag
    if (strcmp(com.handshaking,"hsRTSCTS")==0)
    {
       newtio.c_cflag|=CRTSCTS;
    }
    else if (strcmp(com.handshaking,"hsXonXoff")==0)
    {
       newtio.c_iflag |=(IXON|IXOFF|IXANY);
    }
    else
       newtio.c_iflag &=~(IXON|IXOFF|IXANY);
    //setting baudrate
    if (strcmp(com.baudrate,"B2400")==0)
    {
        cfsetispeed(&newtio,B2400);
	cfsetospeed(&newtio,B2400);
    }
    else if (strcmp(com.baudrate,"B9600")==0)
    {
	cfsetispeed(&newtio,B9600); 
        cfsetospeed(&newtio,B9600);	
    }
    else if (strcmp(com.baudrate,"B19200")==0)
    {
        cfsetispeed(&newtio,B19200);	    
	cfsetospeed(&newtio,B19200);
    }
    else
    {
	cfsetispeed(&newtio,B9600);    
	cfsetospeed(&newtio,B9600);
    }
    tcflush(fd, TCIFLUSH);
    tcsetattr(fd,TCSANOW,&newtio);
    return(fd);
}