2.4.5.2. - CAMAC (IEEE-583) Hardware Functions
CAMAC functions are available if the appropriate hardware
devices and software drivers have been installed on the computer.
The
config
file describes which CAMAC hardware is installed.
Refer to the
Administrator's Guide
for information on the supported CAMAC controllers and
how to install the corresponding drivers.
CAMAC modules are programmed with
FNA
codes where
F
is a function code,
N
is the slot number and
A
is a subaddress number.
Slot numbers are assigned in the
config
file.
Built-in code for the specialized CAMAC devices used for controlling
motors, clocks and scalers is accessed through commands such as
mcount(),
tcount()
and
move_all.
However, simple devices, such as input or output registers,
can be accessed directly by the user.
These modules are also assigned slot numbers in
the
config
file.
They are also given
device numbers, starting at 0, that are used in the
following functions.
ca_get(device, address)-
The CAMAC module having
device number
device,
as set in the
config
file, is read
using
F = 0
and
A = address
with the 24-bit value so obtained returned.
Resets to command level if not configured for
device.
ca_put(x, device, address)-
This function is similar to
ca_get() above, except
the 24-bit value
x
is written
using
F = 16.
The actual number written is returned, which is the 24-bit integer
representation of
x.
Resets to command level if not configured for
device.
ca_fna(f, n, a [, v ])-
Sends the arbitrary FNA command to the module in slot
n.
If the dataway command given by
f
is a write function, the 24-bit value to be written is contained
in
v.
If the dataway command given by
f
is a read command, the function returns the 24-bit value obtained
from the module.
The user should avoid issuing commands that would cause a LAM and
should certainly avoid issuing commands to slots that are being
used for motor or counter control by spec's internal hardware code.
ca_cntl(cmd, [, arg ])-
Performs the selected CAMAC crate command according to the
parameter
cmd,
as follows:
"Z" or "init"-
performs a crate initialize (reset).
"C" or "clear"-
performs a crate clear.
"inhibit" - set crate inhibit if
arg
is 1 and clears crate inhibit if
arg
is 0.
During normal operation, you should not need to issue these commands.
You should probably issue a
reconfig after sending a crate initialize or clear.
|
Prev | Next 