Serial port Low Level access....

[webquinty]

Hello,

I am interesting in send a signal break using serial port.
In minicom there is a option to do it but I don't know how to do it in my programm.

As I know, signal break is to put 1 in TXD.

Is there any way to do it??
any information or advice???

Best regards.

[SteveH]

Hi,

I only know the answer using ms windows - basically you can't do it directly to hardware but need to use a windows api (ie, EscapeCommFunction - SETBREAK). I don't think Qextserial port has this function but I do have my own version of windows serial coms (wincomport) under Qt4 that should easily be updated to add this function, I'll take a look over the next few days and add it on then post it back on this thread.
I don't know if you can write direct to the serial i/o chip under unix/x11 but if you can then I can give you the machine code needed assuming Qt has a means to add inline asm code.

[webquinty]

OK..

I find a solution...

#include <termios.h>
int tcsendbreak(int fildes, int duration);

#include <termios.h>
int tcsendbreak(int fildes, int duration);

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transmit stream of zeroes to terminal

Best regards