739 lines
16 KiB
Groff
739 lines
16 KiB
Groff
.\" Copyright (c) 2010, Joerg Wunsch
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 1, 2010
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.Dt GPIB 3
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.Os
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.Sh NAME
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.\" .Nm ibask ,
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.\" .Nm ibbna ,
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.\" .Nm ibcac ,
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.Nm ibclr ,
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.\" .Nm ibcmd ,
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.\" .Nm ibcmda ,
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.\" .Nm ibconfig ,
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.Nm ibdev ,
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.\" .Nm ibdiag ,
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.Nm ibdma ,
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.Nm ibeos ,
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.Nm ibeot ,
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.\" .Nm ibevent ,
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.\" .Nm ibfind ,
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.\" .Nm ibgts ,
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.\" .Nm ibist ,
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.\" .Nm iblines ,
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.\" .Nm ibllo ,
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.\" .Nm ibln ,
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.Nm ibloc ,
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.Nm ibonl ,
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.Nm ibpad ,
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.\" .Nm ibpct ,
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.\" .Nm ibpoke ,
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.\" .Nm ibppc ,
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.Nm ibrd ,
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.\" .Nm ibrda ,
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.\" .Nm ibrdf ,
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.\" .Nm ibrdkey ,
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.\" .Nm ibrpp ,
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.\" .Nm ibrsc ,
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.\" .Nm ibrsp ,
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.\" .Nm ibrsv ,
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.Nm ibsad ,
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.\" .Nm ibsgnl ,
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.Nm ibsic ,
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.\" .Nm ibsre ,
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.\" .Nm ibsrq ,
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.\" .Nm ibstop ,
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.Nm ibtmo ,
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.\" .Nm ibtrap ,
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.Nm ibtrg ,
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.\" .Nm ibwait ,
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.Nm ibwrt
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.\" .Nm ibwrta ,
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.\" .Nm ibwrtf ,
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.\" .Nm ibwrtkey ,
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.\" .Nm ibxtrc
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.Nd "GPIB library"
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.Sh LIBRARY
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.Lb libgpib
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.Sh SYNOPSIS
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.In gpib.h
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.Pp
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.Dv extern int ibcnt ,
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.Dv iberr ,
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.Dv ibsta ;
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.Pp
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.Ft int
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.Fn ibask "int handle" "int option" "int *retval"
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.Ft int
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.Fn ibbna "int handle" "char *bdname"
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.Ft int
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.Fn ibcac "int handle" "int v"
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.Ft int
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.Fn ibclr "int handle"
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.Ft int
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.Fn ibcmd "int handle" "void *buffer" "long cnt"
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.Ft int
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.Fn ibcmda "int handle" "void *buffer" "long cnt"
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.Ft int
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.Fn ibconfig "int handle" "int option" "int value"
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.Ft int
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.Fn ibdev "int boardID" "int pad" "int sad" "int tmo" "int eot" "int eos"
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.Ft int
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.Fn ibdiag "int handle" "void *buffer" "long cnt"
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.Ft int
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.Fn ibdma "int handle" "int v"
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.Ft int
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.Fn ibeos "int handle" "int eos"
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.Ft int
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.Fn ibeot "int handle" "int eot"
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.Ft int
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.Fn ibevent "int handle" "short *event"
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.Ft int
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.Fn ibfind "char *bdname"
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.Ft int
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.Fn ibgts "int handle" "int v"
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.Ft int
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.Fn ibist "int handle" "int v"
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.Ft int
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.Fn iblines "int handle" "short *lines"
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.Ft int
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.Fn ibllo "int handle"
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.Ft int
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.Fn ibln "int handle" "int padval" "int sadval" "short *listenflag"
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.Ft int
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.Fn ibloc "int handle"
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.Ft int
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.Fn ibonl "int handle" "int v"
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.Ft int
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.Fn ibpad "int handle" "int pad"
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.Ft int
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.Fn ibpct "int handle"
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.Ft int
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.Fn ibpoke "int handle" "int option" "int value"
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.Ft int
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.Fn ibppc "int handle" "int v"
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.Ft int
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.Fn ibrd "int handle" "void *buffer" "long cnt"
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.Ft int
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.Fn ibrda "int handle" "void *buffer" "long cnt"
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.Ft int
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.Fn ibrdf "int handle" "char *flname"
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.Ft int
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.Fn ibrdkey "int handle" "void *buffer" "int cnt"
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.Ft int
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.Fn ibrpp "int handle" "char *ppr"
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.Ft int
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.Fn ibrsc "int handle" "int v"
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.Ft int
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.Fn ibrsp "int handle" "char *spr"
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.Ft int
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.Fn ibrsv "int handle" "int v"
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.Ft int
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.Fn ibsad "int handle" "int sad"
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.Ft int
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.Fn ibsgnl "int handle" "int v"
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.Ft int
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.Fn ibsic "int handle"
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.Ft int
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.Fn ibsre "int handle" "int v"
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.Ft int
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.Fn ibsrq "(*func) void)"
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.Ft int
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.Fn ibstop "int handle"
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.Ft int
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.Fn ibtmo "int handle" "int tmo"
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.Ft int
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.Fn ibtrap "int mask" "int mode"
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.Ft int
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.Fn ibtrg "int handle"
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.Ft int
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.Fn ibwait "int handle" "int mask"
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.Ft int
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.Fn ibwrt "int handle" "const void *buffer" "long cnt"
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.Ft int
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.Fn ibwrta "int handle" "const void *buffer" "long cnt"
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.Ft int
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.Fn ibwrtf "int handle" "const char *flname"
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.Ft int
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.Fn ibwrtkey "int handle" "const void *buffer" "int cnt"
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.Ft int
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.Fn ibxtrc "int handle" "void *buffer" "long cnt"
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.Sh DESCRIPTION
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The
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.Nm
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library provides access to the
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.Xr gpib 4
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kernel devices.
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.Ss Variable Description
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The variable
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.Dv ibcnt
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contains the number of bytes transferred in the most recent call to
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.Fn ibcmd ,
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.Fn ibrd ,
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or
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.Fn ibwrt .
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.Pp
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The name
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.Dv ibcntl
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is an alias for
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.Dv ibcnt ,
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provided for backwards compatibility.
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.Pp
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The variable
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.Dv iberr
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provides an error code for the most recent library call.
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The possible error codes are:
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.Bl -tag -offset indent -compact
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.It EDVR
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System error
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.It ECIC
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Not Active Controller
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.It ENOL
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Nobody listening
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.It EADR
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Controller not addressed
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.It EARG
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Invalid argument
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.It ESAC
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Not System Controller
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.It EABO
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I/O Aborted/Time out
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.It ENEB
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No such controller
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.It EOIP
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Async I/O in progress
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.It ECAP
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No such capability
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.It EFSO
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File system error
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.It EBUS
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Command byte xfer error
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.It ESTB
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Serial poll status byte lost
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.It ESRQ
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SRQ line stuck
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.It ETAB
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Table problem
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.El
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.Pp
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The variable
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.Dv ibsta
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contains the controller status.
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This is an ORed status value, with the following individual bit names:
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.Bl -tag -offset indent -compact
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.It ERR
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Error
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.It TIMO
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Timeout
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.It END
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EOI/EOS
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.It SRQI
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SRQ
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.It RQS
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Device requests service
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.It SPOLL
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Serial Poll
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.It EVENT
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Event occured
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.It CMPL
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I/O complete
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.It LOK
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Lockout
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.It REM
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Remote
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.It CIC
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CIC
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.It ATN
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ATN
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.It TACS
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Talker
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.It LACS
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Listener
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.It DTAS
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Device trigger status
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.It DCAS
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Device clear state
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.El
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.Ss Function Description
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.Pp
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The function
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.Fn ibdev
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is used to open the GPIB device, and establish the parameters to
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communicate with a particular bus device. The device is selected
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by its primary address
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.Fa pad ,
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a numerical value between 0 and 30, possibly additionally by its
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secondary address
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.Fa sad ,
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a numerical value between 96 and 126, or 0 to not use secondary
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addressing.
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The
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.Fa tmo
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value specifies the timeout to use when communicating with the device.
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This can be any of the constants
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.Dv TNONE ,
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.Dv T10us ,
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.Dv T30us ,
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.Dv T100us ,
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.Dv T300us ,
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.Dv T1ms ,
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.Dv T3ms ,
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.Dv T10ms ,
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.Dv T30ms ,
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.Dv T100ms ,
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.Dv T300ms ,
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.Dv T1s ,
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.Dv T3s ,
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.Dv T10s ,
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.Dv T30s ,
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.Dv T100s ,
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.Dv T300s ,
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or
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.Dv T1000s .
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The boolean parameter
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.Fa eot
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specifies whether the bus signal
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.Li EOI
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(end-or-identify) should be asserted when sending the last byte of a
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message to the device.
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Finally, the
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.Fa eos
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parameter determines whether any special character should be used to
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identify the end of a device message when transferring messages on the
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bus.
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The lower 8 bits of
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.Fa eos
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are interpreted as an end-of-string character,
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.Li EOS .
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This character can be ORed with the following values:
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.Bl -tag -compact -offset indent
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.It Dv REOS
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When receiving a message byte on the bus that matches the
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.Li EOS
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character, treat it as if the
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.Li EOI
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signal were asserted, and stop receiving.
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.It Dv XEOS
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When transmitting a message byte on the bus that matches the
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.Li EOS
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character, assert the
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.Li EOI
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bus signal by the same time, and stop sending.
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.It Dv BIN
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If set, include all 8 bits of the
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.Li EOS
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character in the comparison; if unset, compare only 7 bit ASCII
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values.
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.El
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Passing 0 as
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.Fa eos
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will turn off any special character treatment, allowing for a fully
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8-bit transparent communications channel to the device.
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.Pp
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The function
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.Fn ibfind
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is meant to find the
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.Em board index
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of a board identified by the name
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.Fa bdname .
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.Em This function is currently not implemented.
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.Pp
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All remaining functions take the handle returned by calling
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.Fn ibdev
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as their first argument
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.Fa handle .
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.Pp
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The function
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.Fn ibask
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is used to query configuration values that have been set with
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.Fn ibconfig .
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.Em This function is currently not implemented.
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.Pp
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The function
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.Fn ibbna
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is meant to change the access board for the given device to
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a new one, named
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.Fa bdname .
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.Em This function is currently not implemented.
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.Pp
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The function
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.Fn ibcac
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is used to become the active controller on the bus, by asserting the
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.Li ATN
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signal line.
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.Em This function is currently not implemented.
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.Pp
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The function
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.Fn ibclr
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is used to transmit a
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.Em Selected Device Clear
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command to the device.
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.Pp
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The function
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.Fn ibcmd
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is used to directly write
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.Fa cnt
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GPIB command bytes from a buffer starting at
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.Fa buffer
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to the device.
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.Em This function is currently not implemented.
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.Pp
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The function
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.Fn ibcmda
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does the same as
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.Fn ibcmd
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except it operates asynchronously, so it returns to the caller
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immediately.
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.Em This function is currently not implemented.
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.Pp
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The function
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.Fn ibconfig
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is used to set certain configuration parameters.
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.Em This function is currently not implemented.
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.Pp
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The function
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.Fn ibdiag
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is obsolete, and not implemented.
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.Pp
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The function
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.Fn ibdma
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is used to enable or disable DMA transfers.
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Parameter
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.Fa v
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is a boolean parameter indicating DMA transfers are to be used.
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Depending on the hardware and operating system configuration, DMA
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transfers might not be available for a particular access board.
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.Pp
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The function
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.Fn ibeos
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configures the end-of-string character.
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See
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.Fn ibdev
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for an explanation.
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.Pp
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The function
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.Fn ibeot
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configures the assertion of the
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.Li EOI
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signal line when transmitting the last byte of a message; see
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.Fn ibdev
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for an explanation.
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.Pp
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The function
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.Fn ibevent
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is used to obtain an event from the board's event queue.
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.Em This function is currently not implemented.
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.Pp
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The function
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.Fn ibgts
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makes the current controller the standby controller, by deasserting
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the
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.Li ATN
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signal line.
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.Em This function is currently not implemented.
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.Pp
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The function
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.Fn ibist
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sets the individual status bits of the controller to the value
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.Fa v .
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|
.Em This function is currently not implemented.
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.Pp
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The function
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.Fn iblines
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returns the status of the control and handshake bus lines into the
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area pointed to by
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.Fa lines .
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.Em This function is currently not implemented.
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.Pp
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The function
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.Fn ibllo
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is obsolete, and not implemented.
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.Pp
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The function
|
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.Fn ibln
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checks for a listener at the primary address
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.Fa padval
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and the optional secondary address
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.Fa sadval .
|
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If a listener was found, the value pointed to by
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.Fa listenflag
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will be set to a non-zero value.
|
|
.Em This function is currently not implemented.
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.Pp
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|
The function
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.Fn ibloc
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turns the device into local mode.
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.Pp
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|
The function
|
|
.Fn ibonl
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|
is used to close or reinitialize a device handle.
|
|
If parameter
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.Fa v
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is passed as zero, the handle will be closed, and cannot be used
|
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again.
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|
If it is passed as a non-zero value, all parameters of the handle
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will be returned to their defaults;
|
|
.Em this functionality is currently unsupported.
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|
.Pp
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|
The function
|
|
.Fn ibpad
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is used to change the primary address of the device being communicated
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with to
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.Fa pad .
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See
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.Fn ibdev
|
|
for an explanation.
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|
.Pp
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|
The function
|
|
.Fn ibpct
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|
is used to make the device associated with the handle the
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controller-in-charge.
|
|
.Em This function is currently not implemented.
|
|
.Pp
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|
The function
|
|
.Fn ibpoke
|
|
is obsolete, and not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibppc
|
|
is used to configure the parallel poll response to
|
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.Fa v .
|
|
.Em This function is currently not implemented.
|
|
.Pp
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|
The fucntion
|
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.Fn ibrd
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|
is used to receive
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.Fa cnt
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|
bytes from the device, and store it to the address passed as
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.Fa buffer .
|
|
.Pp
|
|
The function
|
|
.Fn ibrda
|
|
behaves similar to
|
|
.Fn ibrd
|
|
except it operates asynchronously, and returns immediately to the
|
|
caller.
|
|
.Em This function is currently not implemented.
|
|
.Pp
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|
The function
|
|
.Fn ibrdf
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|
read data from the device, and appends it to the file with the name
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.Fa flname .
|
|
.Em This function is currently not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibrdkey
|
|
is obsolete, and not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibrpp
|
|
performs a parallel poll, and stores the result at the location
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pointed to by
|
|
.Fa ppr .
|
|
.Em This function is currently not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibrsc
|
|
makes the board specified by the handle the
|
|
.Em system controller
|
|
if the argument
|
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.Fa v
|
|
is non-zero.
|
|
.Em This function is currently not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibrsp
|
|
conducts a serial poll, and stores the result in the byte pointed
|
|
to by
|
|
.Fa spr .
|
|
.Em This function is currently not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibrsv
|
|
sets the serial poll response of the board to
|
|
.Fa v ,
|
|
possibly requesting service from the controller if the SRQ bit (0x40)
|
|
is set.
|
|
.Em This function is currently not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibsad
|
|
changes the secondary address of the device being communicated with to
|
|
.Fa sad .
|
|
See
|
|
.Fn ibdev
|
|
for an explanation.
|
|
.Pp
|
|
The function
|
|
.Fn ibsgnl
|
|
is obsolete, and not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibsic
|
|
asserts the
|
|
.Em Interface Clear (IFC)
|
|
signal line on the bus for at least 100 microseconds.
|
|
This will make all devices attached to the bus to unlisten and untalk.
|
|
This function should only be executed on the system controller.
|
|
.Pp
|
|
The function
|
|
.Fn ibsre
|
|
asserts the
|
|
.Em Remote Enable (REN)
|
|
signal line on the bus if argument
|
|
.Fa v
|
|
is non-zero, or deasserts it otherwise.
|
|
.Em This function is currently not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibsrq
|
|
is obsolete, and not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibstop
|
|
stops or aborts any asynchronous I/O operation.
|
|
.Em This function is currently not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibtmo
|
|
reconfigures the communication timeout.
|
|
See
|
|
.Fn ibdev
|
|
for an explanation.
|
|
.Pp
|
|
The function
|
|
.Fn ibtrap
|
|
is obsolete, and not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibtrg
|
|
sends a
|
|
.Em Group Execute Trigger (GET)
|
|
command to the device.
|
|
.Pp
|
|
The function
|
|
.Fn ibwait
|
|
waits for a status condition as specified by
|
|
.Fa mask .
|
|
If
|
|
.Fa mask
|
|
is given as zero, it returns immediately.
|
|
.Em This function is currently not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibwrt
|
|
is used to send
|
|
.Fa cnt
|
|
bytes to the device, starting at the address pointed to by
|
|
.Fa buffer .
|
|
.Pp
|
|
The function
|
|
.Fn ibwrta
|
|
performs the same operation as
|
|
.Fn ibwrt
|
|
in an asynchronous way, returning immediately to the caller.
|
|
.Em This function is currently not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibwrtf
|
|
opens the file named by
|
|
.Fa flname ,
|
|
and sends its contents to the device.
|
|
.Em This function is currently not implemented.
|
|
.Pp
|
|
The function
|
|
.Fn ibwrtkey
|
|
is obsolete, and not implemented
|
|
.Pp
|
|
The function
|
|
.Fn ibxtrc
|
|
is obsolete, and not implemented.
|
|
.Sh RETURN VALUES
|
|
The function
|
|
.Fn ibdev
|
|
returns a handle to be used for the remaining functions.
|
|
Upon failure, -1 is returned.
|
|
.Pp
|
|
All other functions return the value of the variable
|
|
.Dv ibsta .
|
|
.Sh DIAGNOSTICS
|
|
None.
|
|
.Sh COMPATIBILITY
|
|
The
|
|
.Nm
|
|
library tries to be compatible with the Linux GPIB library,
|
|
which in turn appears to be compatible with the GPIB library
|
|
shipped by National Instruments.
|
|
.Sh ERRORS
|
|
Errors in the functions above might set
|
|
.Dv errno
|
|
to one of these values:
|
|
.Bl -tag -width Er
|
|
.It Bq Er ENOENT
|
|
No such file or directory.
|
|
.It Bq Er EIO
|
|
Input/output error.
|
|
.It Bq Er ENXIO
|
|
Device not configured.
|
|
.It Bq Er E2BIG
|
|
Argument list too long.
|
|
.It Bq Er ENOMEM
|
|
Cannot allocate memory.
|
|
.It Bq Er EACCES
|
|
Permission denied.
|
|
.It Bq Er EFAULT
|
|
Bad address.
|
|
.It Bq Er EBUSY
|
|
Device busy.
|
|
.It Bq Er EINVAL
|
|
Invalid argument.
|
|
.It Bq Er ENFILE
|
|
Too many open files in system.
|
|
.It Bq Er EMFILE
|
|
Too many open files.
|
|
.It Bq Er EOPNOTSUPP
|
|
Operation not supported.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr gpib 4
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
library was written by
|
|
.An Poul-Henning Kamp
|
|
and first appeared in
|
|
.Fx 5.4 .
|
|
.Sh AUTHORS
|
|
This manual page was written by
|
|
.An J\(:org Wunsch .
|
|
.Sh BUGS
|
|
Currently, the library can only handle a single
|
|
.Xr gpib 4
|
|
device with instance number 0.
|
|
.Pp
|
|
Many functions are currently not implemented, see above for details.
|