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char_t *dev = "/dev/ttyS0";//com1
char_t *dev = "/dev/ttyS0";//com1 int32_t fd = open( dev, O_RDWR | O_NOCTTY );//| O_NOCTTY );//O_NDELAY );//| O_NOCTTY | O_NDELAY O_NONBLOCK if (-1 == fd) { perror("Can't Open Serial Port"); exit(1); } else { set_speed(fd,115200 ); if (set_Parity(fd,8,1,'N') == FALSE) { printf("Set Parity Error\n"); close(fd); exit(1); } }int set_Parity(int fd,int databits,int stopbits,int parity){ struct termios options; if ( tcgetattr( fd,&options) != 0) { perror("SetupSerial 1"); return(FALSE); } options.c_cflag &= ~CSIZE; options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /*Input*/ options.c_oflag &= ~OPOST; /*Output*/ options.c_iflag &= ~IXON; //0x11 options.c_iflag &= ~ICRNL; //0x0d// options.c_cflag|=CLOCAL;// options.c_cflag|=CREAD;// options.c_cflag&=~CRTSCTS;/*Êý¾ÝÁ÷¿ØÖÆ,ÎÞ*/ switch (databits) /*ÉèÖÃÊý¾ÝλÊý*/ { case 7: options.c_cflag |= CS7; break; case 8: options.c_cflag |= CS8; break; default: fprintf(stderr,"Unsupported data size\n"); return (FALSE); }switch (parity) { case 'n': case 'N': options.c_cflag &= ~PARENB; /* Clear parity enable */ options.c_iflag &= ~INPCK; /* Enable parity checking */ break; case 'o': case 'O': options.c_cflag |= (PARODD | PARENB); /* ÉèÖÃΪÆæЧÑé*/ options.c_iflag |= INPCK; /* Disnable parity checking */ break; case 'e': case 'E': options.c_cflag |= PARENB; /* Enable parity */ options.c_cflag &= ~PARODD; /* ת»»ÎªÅ¼Ð§Ñé*/ options.c_iflag |= INPCK; /* Disnable parity checking */ break; case 'S': case 's': /*as no parity*/ options.c_cflag &= ~PARENB; options.c_cflag &= ~CSTOPB;break; default: fprintf(stderr,"Unsupported parity\n"); return (FALSE); } /* ÉèÖÃֹͣλ*/ switch (stopbits){ case 1: options.c_cflag &= ~CSTOPB; break; case 2: options.c_cflag |= CSTOPB; break; default: fprintf(stderr,"Unsupported stop bits\n"); return (FALSE); } /* Set input parity option */ if (parity != 'n') options.c_iflag |= INPCK; tcflush(fd,TCIFLUSH);options.c_cc[VTIME] = 0; /* ÉèÖó¬Ê±0 seconds*/ options.c_cc[VMIN] = 1; /* define the minimum bytes data to be readed*/if (tcsetattr(fd,TCSANOW,&options) != 0) { perror("SetupSerial 3"); return (FALSE); } return (TRUE); }void set_speed(int fd, int speed){ int i; int status; struct termios Opt; tcgetattr(fd, &Opt); int speed_arr[] = { B115200,B38400, B19200, B9600, B4800, B2400, B1200, B300, B38400, B19200, B9600, B4800, B2400, B1200, B300, }; int name_arr[] = {115200,38400, 19200, 9600, 4800, 2400, 1200, 300, 38400, 19200, 9600, 4800, 2400, 1200, 300, }; for ( i= 0; i < sizeof(speed_arr) / sizeof(int); i++) { if (speed == name_arr[i]) { tcflush(fd, TCIOFLUSH); cfsetispeed(&Opt, speed_arr[i]); cfsetospeed(&Opt, speed_arr[i]); status = tcsetattr(fd, TCSANOW, &Opt); if (status != 0) { perror("tcsetattr fd"); return; } tcflush(fd,TCIOFLUSH); } }} |
