Experimental Physics and
Industrial Control System

[email protected] (Torben Lauritsen) · Tue, 5 May 1998 14:55:27 -0500

Hi,

I have a problem issuing CNAF control commands using a CES "CBD 8210
branch driver" from a VxWorks program. Can anyone help?

I'm running VxWorks on a Nat'l Instruments VXIcpu-030 sitting in
a VXI crate with the "CBD 8210 branch driver" (seeing the backplane
through a 73A-851 Adaptor Module from Colorado Data systems/Tektronix).

--------------------------------------------------------

Here is the story:

I can successfully use CNAF read and write commands by:

1) calculating an address as

  address = (uint32 *)
     (CAMBAS +
     ((uint16) b << CAMB) +
     ((uint16) c << CAMC) +
     ((uint16) n << CAMN) +
     ((uint16) a << CAMA) +
     ((uint16) f << CAMF) + BOARDADR + 2);

2)

and then read a value as

      data_in = *(uint16 *) address;

or write a value as

      *(uint16 *)address = data_out;

That works fine!!!

--------------------------------------------------------

The problem comes when I try to issue CNAF control commands, I.e.,
commands with function values: 8-15 and 24-31. The manual is rather
cryptic about the command functions; but what I read is that a command
function is like a read followed by the tst instruction.

Thus, I have tried the following things

a) data_in = *(uint16 *) address;
   followed by a
   asm("tstw %0": :"a"(*(uint16 *)address));

and

b) putting the read into an if statement, expecting that
   a tst instruction will then be be generated:

   if ( data_in = *(uint16 *) address ) {};

   also tried

   if ( *(uint16 *) address ) {};

None of them worked either!

-----------------------------

suggestions?

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_/ Torben Lauritsen, Staff Scientist                            _/
_/ E-mail:     [email protected]                                   _/
_/ Snail mail: Argonne National Laboratory, Building 203,       _/
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System