I am trying to set a baud rate of 250K for my UARTS. I have the following
(using debian):
[code]
int speed=250000;
struct serial_struct ser_info;
struct termios options;
ser_info.reserved_char[0] = 0;
ioctl(handle, TIOCGSERIAL, &ser_info);
ser_info.flags = (ser_info.flags & ~ASYNC_SPD_MASK) |
ASYNC_SPD_CUST;
ser_info.custom_divisor = (ser_info.baud_base + (speed/2) )
/ speed;
int closestSpeed = ser_info.baud_base / ser_info.
custom_divisor;
if (closestSpeed < speed * 98 / 100 || closestSpeed > speed
* 102 / 100)
{
std::cout <<" Cannot set serial port speed to "<<
speed<<" closest possible is " <<closestSpeed<<std::endl;
}
else
std::cout <<"Setting speed to " << closestSpeed<<std
::endl;
if (ioctl(handle, TIOCSSERIAL, &ser_info)<0)
{
std::cout <<"Error setting serial options: "<<
strerror(errno) <<std::endl;
}
However, this always returns an error on the last ioctl to set the custom
divisor (it says invalid parameter). Any helpful insight?
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