Re: what decides allowable serial speeds?

Actually you don't have to, there is an ioctl that will allow you to ask the driver for any random speed.

It should be available on any 10.4.x system.

#include <IOKit/serial/ioss.h>

The ioctl is IOSSIOSPEED.  It takes a single speed_t argument.

Godfrey

On 26/07/2006, at 4:06 AM, Sean McBride wrote:

Hi all,

I notice that the highest speed termios.h defines is B230400.  I have a

serial device that supports higher speeds such as 921600.  Is it not

present in termios.h because it is unsupported?  tcsetattr() returns

success after setting the speed to 921600.  Do the supported speeds

depend exclusively on the serial hardware (USB-serial adapter these

days)?  Or does the OS have influence on which speeds are allowed?

I ask all this because my device works at many speeds, except the

highest speed it supposedly supports.  I'm trying to figure out if this

is the device's fault, the OS's, or the USB-Serial Adapter's.

Thanks,

PS: I hope this list is appropriate, sorry if not.

--

____________________________________________________________

Sean McBride, B. Eng                 email@hidden

Rogue Research                        www.rogue-research.com

Mac Software Developer              Montréal, Québec, Canada

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