I needed to get some data out from some of my measurement equipment
for some $work and the hacked up userland /dev/io code I have used
for some time just didn't cut it.
So now we have the skeleton of ibfoo() support in FreeBSD. We only
support PCIIA compatible adapters, and only a very small subset of
the ibfoo() functions are implemented, but the framework has been
written so that both other hardware and more functions should be a
matter of very little work.
Completing this is on my wish-list, but only on my todo list to the
extent that I need it for something else. Help to get this more
complete is most welcome!
The "wish list":
o Complete more of the ibfoo() functions.
o Support for different GPIB cards.
o IEEE488.2 API implentation.
o Manual pages. (Either just reference the NI docs or rewrite it
all to avoid copyright issues).
Reading material:
http://www.ni.com/pdf/manuals/321038g.pdf
http://www.measurementcomputing.com/gpibhelp_Lib4881.html
http://linux-gpib.sourceforge.net/doc_html/index.html
The following program should be able to pull out the identity of
any SCPI instrument which happens to sit on PAD21 on your GPIB bus,
/* compile with: cc -o ibtest ibtest.c -lgpib */
#include <stdio.h>
#include <err.h>
#include <vis.h>
#include <gpib/gpib.h>
int
main(int argc __unused, char **argv __unused)
{
int dmm;
unsigned char buf[100];
char vbuf[sizeof buf * 4];
/* DVM */
dmm = ibdev(0, 21, 0, T10s, 1, 0);
if (dmm < 0)
errx(1, "ibdev = %d\n", dmm);
ibwrt(dmm, "*IDN?\r\n", 7);
ibrd(dmm, buf, sizeof buf - 1);
strvisx(vbuf, buf, ibcnt, VIS_WHITE | VIS_CSTYLE);
printf("%s\n", vbuf);
return (0);
}
Poul-Henning
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[EMAIL PROTECTED] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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