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Add an example, derived from the basic demo phk once sent me.

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This commit is contained in:
joerg 2010-01-25 06:37:44 +00:00
parent 627ca92735
commit 048b796ee5
1 changed files with 33 additions and 0 deletions
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33
share/man/man4/gpib.4
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@ -44,6 +44,39 @@ IEC-625 (or just "IEC bus"), or HP-IB (Hewlett Packard Instrument
Bus), or GPIB (General Purpose Instrument Bus).
The device can become either a listener, talker, controller, and
in particular a master controller on the bus.
.Ss Example
The following example code queries the device provided as
.Va argv[1]
for its identification response.
.Bd -literal
/* compile with: cc -O -o ibtest ibtest.c -lgpib */
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include <vis.h>
#include <gpib/gpib.h>
int
main(int argc, char **argv)
{
int dmm;
unsigned char buf[100];
char vbuf[sizeof buf * 4];
/* DVM */
dmm = ibdev(0, (argc > 1? atoi(argv[1]): 7), 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);
}
.Ed
.Sh FILES
.Bl -tag -width /dev/gpibNNib
.It Pa /dev/gpib Ns Em N Ns "ib"