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linux 串口编程初始化函数

2017-06-07 21:38 323 查看

int set_opt(int fd,int nSpeed, int nBits, char nEvent, int nStop)

{

struct termios newtio,oldtio;

if ( tcgetattr( fd,&oldtio) != 0) {

  perror("SetupSerial 1");

  return -1;

}

bzero( &newtio, sizeof( newtio ) );

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':

  newtio.c_cflag |= PARENB;

  newtio.c_cflag |= PARODD;

  newtio.c_iflag |= (INPCK | ISTRIP);

  break;

case 'E':

  newtio.c_iflag |= (INPCK | ISTRIP);

  newtio.c_cflag |= PARENB;

  newtio.c_cflag &= ~PARODD;

  break;

case 'N':

  newtio.c_cflag &= ~PARENB;

  break;

}

switch( nSpeed )

{

case 2400:

  cfsetispeed(&newtio, B2400);

  cfsetospeed(&newtio, B2400);

  break;

case 4800:

  cfsetispeed(&newtio, B4800);

  cfsetospeed(&newtio, B4800);

  break;

case 9600:

  cfsetispeed(&newtio, B9600);

  cfsetospeed(&newtio, B9600);

  break;

case 115200:

  cfsetispeed(&newtio, B115200);

  cfsetospeed(&newtio, B115200);

  break;

case 460800:

  cfsetispeed(&newtio, B460800);

  cfsetospeed(&newtio, B460800);

  break;

default:

  cfsetispeed(&newtio, B9600);

  cfsetospeed(&newtio, B9600);

  break;

}

if( nStop == 1 )

  newtio.c_cflag &= ~CSTOPB;

else if ( nStop == 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("com set error");

  return -1;

}

// printf("set done!\n\r");

return 0;

}

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