Experimental Physics and
Industrial Control System

Kay-Uwe Kasemir <[email protected]> · Thu, 20 Aug 1998 08:58:31 +0200

Arne:

>I am presently using a IP Octal Serial card from greenspring
>to accomodate the serial devices.  However the serial lines on
>this card default to 9600 baud, 8 data bits no parity....
>
>I've looked in to the Vxworks tyLib package and can only find 
>function calls to change the baud rate, and another OPT_7_BIT which
>I think will place the port in 7 data bit mode. 

How did you manage to call the IP octal at all with the
standard VxWorks drivers?
As far as I know it is not supported by VxWorks if you
just plug it in.

I've used an IP-octal at DESY where they had bought
a special driver for it from SOFTEC GmbH, 89073 Ulm, Germany.
It comes with a file called ip8s.h that defines
some additional bits for ioctl(): speed, 5,6,7,8 bits, even,odd,no parity etc.
I extended it with the necessary bits from the IP octal manual
so that I could use mark/space "parity":

#define OPT_SPACE       0x08
#define OPT_MARK        0x0C

>What I cannot find is a way to put the port in parity=odd and
>to look for 1 stop bit.  
If your driver will just use whatever is given to ioctl()
and set the mode register, e.g.:

	ioctl (fd, FIOPARITY, OPT_EVEN)

will end up like this in the driver code:
    case FIOPARITY:
	status = ip8sMRSet(pip8sDv, arg, PARITY_MASK ,0,0);

then you can use the actual hardware bits:

#define OPT_NONE	0x10
#define OPT_EVEN	0x00
#define OPT_ODD		0x04

#define OPT_STOP_1_0	0x07
#define OPT_STOP_1_5	0x08
#define OPT_STOP_2_0	0x0f

So with the proper driver it should pose no problem, you can just use:
        ioctl (m->fd, FIOSETOPTIONS, OPT_RAW)
        ioctl (m->fd, FIOBAUDRATE, 1200)
        ioctl (m->fd, FIOCHARSIZE, OPT_7BITS)
        ioctl (m->fd, FIOPARITY, OPT_EVEN)
        ioctl (m->fd, FIOSTOPBITS, OPT_STOP_1_0)
        for example.

Unfortunately I cannot send you the driver code from SOFTEC
without being shot because of copyright violation...
But if you have any questions please feel free to bug me.

-Kay

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System