#include<termios.h>
struct termios oldtio, newtio;
fd = open(“/dev/tty0”, O_RDWR|O_NOCTTY);
tcgetattr(fd, &oldtio);//获取终端参数，在进行设置串口参数之前必须先获取。
bzero(&newtio, sizeof(newtio));
newtio = oldtio;
//设置波特率
switch(pSysInfo->rs485.Baudrate)
{
case 0:
cfsetispeed(&newtio, B300);
cfsetospeed(&newtio, B300);
break;
case 1:
cfsetispeed(&newtio, B600);
cfsetospeed(&newtio, B600);
break;
case 2:
cfsetispeed(&newtio, B1200);
cfsetospeed(&newtio, B1200);
break;
case 3:
cfsetispeed(&newtio, B2400);
cfsetospeed(&newtio, B2400);
break;
case 4:
cfsetispeed(&newtio, B9600);
cfsetospeed(&newtio, B9600);
break;
case 5:
cfsetispeed(&newtio, B19200);
cfsetospeed(&newtio, B19200);
break;
case 6:
cfsetispeed(&newtio, B38400);
cfsetospeed(&newtio, B38400);
break;
case 7:
cfsetispeed(&newtio, B57600);
cfsetospeed(&newtio, B57600);
break;
case 8:
cfsetispeed(&newtio, B115200);
cfsetospeed(&newtio, B115200);
break;
default:
printf("bauldrate set wrong\n");
}
//设置数据位
switch(pSysInfo->rs485.Databits)
{
case 8:
newtio.c_cflag&=~CSIZE;
newtio.c_cflag |=CS8;
break;
case 7:
newtio.c_cflag&=~CSIZE;
newtio.c_cflag |=CS7;
break;
case 6:
newtio.c_cflag&=~CSIZE;
newtio.c_cflag |=CS6;
break;
case 5:
newtio.c_cflag&=~CSIZE;
newtio.c_cflag |=CS5;
break;
default:
printf("databits set wrong\n");
}
//设置停止位
if(pSysInfo->rs485.Stopbit == 1)
{
newtio.c_cflag &= ~CSTOPB;
}else if(pSysInfo->rs485.Stopbit == 2)
{
newtio.c_cflag |= CSTOPB;
}else
{
printf("Stopbit set wrong\n");
}
//设置奇偶校验位
switch(pSysInfo->rs485.Paritybit)
{
case 0:
newtio.c_cflag &= ~PARENB;
break;
case 1:
newtio.c_cflag |= (PARODD | PARENB);
break;
case 2:
newtio.c_cflag &= ~ PARENB;
newtio.c_cflag &= ~PARODD;
break;
case 3:
newtio.c_cflag &= ~PARENB;
newtio.c_cflag &= ~CSTOPB;
break;
default:
printf("Paritybit set wrong\n");
}
//设置流控
switch(pSysInfo->rs485.FlowControl)
{
case 0:
newtio.c_cflag &= ~CRTSCTS;
break;
case 1:
newtio.c_cflag |= CRTSCTS;
break;
case 2:
newtio.c_cflag |= IXON|IXOFF|IXANY;
break;
default:
printf("FlowControl set wrong\n");
}
cfmakeraw(&newtio);
tcflush(fd, TCIOFLUSH);
tcsetattr(fd, TCSANOW, &newtio);
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