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author | joerg <joerg@FreeBSD.org> | 2010-01-25 06:37:44 +0000 |
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committer | joerg <joerg@FreeBSD.org> | 2010-01-25 06:37:44 +0000 |
commit | 048b796ee5ec4c61205ae039484da25230762f4f (patch) | |
tree | 2cc505734644d54e0a9402e61852637c656cda48 /share/man/man4 | |
parent | 627ca92735e5359e6f20b6c910538b5b82e36a3a (diff) | |
download | FreeBSD-src-048b796ee5ec4c61205ae039484da25230762f4f.zip FreeBSD-src-048b796ee5ec4c61205ae039484da25230762f4f.tar.gz |
Add an example, derived from the basic demo phk once sent me.
Diffstat (limited to 'share/man/man4')
-rw-r--r-- | share/man/man4/gpib.4 | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/share/man/man4/gpib.4 b/share/man/man4/gpib.4 index e5e7a1b..1e84381 100644 --- a/share/man/man4/gpib.4 +++ b/share/man/man4/gpib.4 @@ -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" |