Hi,
I need the serial port supports non-standard baud rate,in the nano system
such as 250000
How do I do it?
the following code, I can not set the baut
//set the non-standard baud rate，lg:250000
int serial_set_speci_baud(int fd,int baud)
{
int ret =-1;
struct termios options;
struct serial_struct ss,ss_set;
memset(&options,0,sizeof(options));
tcgetattr(fd,&options);
cfsetispeed(&options,B38400);
cfsetospeed(&options,B38400);
tcflush(fd,TCIFLUSH);/handle unrecevie char/
tcsetattr(fd,TCSANOW,&options);
if((ioctl(fd,TIOCGSERIAL,&ss)) < 0)
{
printf(“BAUD: error to get the serial_struct info:%s\n”,strerror(errno));
return -1;
}
ss.flags = ASYNC_SPD_CUST;
ss.custom_divisor = ss.baud_base / baud;
printf(“ss.custom_divisor = %d \r\n”,ss.custom_divisor);
if((ioctl(fd,TIOCSSERIAL,&ss)) < 0)
{
printf(“BAUD: error to set serial_struct:%s\n”,strerror(errno));
return -1;
}
ret = ioctl(fd,TIOCGSERIAL,&ss_set);
tcgetattr(fd,&options);
int boudrate11 = cfgetospeed(&options);
printf("ret= %d,BAUD: success set baud to %d,custom_divisor=%d,baud_base=%d\n",ret,baud,ss_set.custom_divisor,ss_set.baud_base);
return 0;
}