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Serial Ports under OSX

Folks

I am sure this subject has come up many times.

I need to include serial communications in my app.

I was developing in Carbon. Then I discovered its not possible to directly access Serial Ports under OSX from Carbon.

So, I am experimenting with Mach-O, hoping to build some kind of library I can use from my Carbon app.

Anyway - simple enough, I am using Apple's SerialSample code using a keyspan USA-28 USB Serial adaptor. The Apple code seems to work OK as is. I am just sending out 'abc' to another CPU running a terminal emulator.

Now, I am trying to increase the baud rate. Apple's example seems to work great at 9600 baud. However as soon as I increase that , using options.c_ispeed = 19200 and options.c_ospeed = 19200, or cfsetspeed, it doesnt change the baud rate used, still chucks out 9600 as far as I can tell.

Does anyone have any idea what might be wrong. Is there something more I need to do in order to change the baud rate ?

Also, does anyone have any advice on making a library from Codewarrior in Mach-O and getting that into a Codewarrior Carbon Project ?

Thanks

Mark Gilbert.

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