set_opt.c

是一套AT 命令

#include "set_opt.h"
int Speed_attr[]={B460800, B115200,B9600,B4800,B2400};
int Speed_name[]={460800,115200,9600,4800,2400};
int set_opt(int fd,int nSpeed,int nBits,char nEvent,int nStop) 
{
     struct termios newtio,oldtio;
     int i;
     if( tcgetattr(fd,&oldtio)!=0) {
            perror("Serial oldtio error");
            return -1;
     }
   
     bzero(&newtio,sizeof(struct termios));
     newtio.c_cflag |=CLOCAL |CREAD;
     newtio.c_cflag &=~CSIZE;
     
     switch(nBits) {
       case 7:
           newtio.c_cflag |=CS7;
           break;
       case 8:
           newtio.c_cflag |=CS8;
           break;
     }
     
     switch(nEvent) {
       case 'o':
       case 'O':
           newtio.c_cflag|=PARENB;
           newtio.c_cflag|=PARODD;
           newtio.c_iflag|=(INPCK|ISTRIP);
           break;
       case 'e':
       case 'E':
           newtio.c_cflag|=PARENB;
           newtio.c_cflag&=~PARODD;
           newtio.c_iflag|=(INPCK|ISTRIP);
           break;
       case 'n':
       case 'N':
           newtio.c_cflag&=~PARENB;
           break;
     }
      
     for( i=0 ; i<sizeof(Speed_name)/sizeof(int);i++) {
         if(nSpeed==Speed_name[i]) {
             cfsetispeed(&newtio,Speed_attr[i]);
             cfsetospeed(&newtio,Speed_attr[i]);
         }
     } 
    
    if(nStop==1) 
         newtio.c_cflag&=~CSTOPB;
    else if(nStop==2)
         newtio.c_cflag|=CSTOPB;

    newtio.c_cc[VTIME]=10;
    newtio.c_cc[VMIN]=0;

    tcflush(fd,TCIFLUSH);

    if((tcsetattr(fd,TCSANOW,&newtio))!=0)
    {
           perror("tcsetattr error");
           return -1 ;
     }
  
    printf("set com OK!!\n");
    return 0;
}