Hello,
I have compliled a simple program that sets up the freq. and span. of a
spectrum analyzer and sets the peak marker and reads back the freq and power
of the marker.
Whenever the code gets to the ibrd after the CALC:MARK:Y? the whole linux
kernel hangs.
The ibwrt,ibrd sequence for extracting the frequency of the marker causes no
problems at all.
I did a GPIB trace and the instrument is sending the result of the power
back to the GPIB card on the linux box, but then it hangs.
I am running Red Hat 6.2 linux.
I installed the ni drivers.
everything seemed to configure correctlty.
the code is attached just for reference. pretty simple stuff, but it does
not work. Any ideas??
#include
#include "ugpib.h
"
main(argc,argv)
int argc;
char *argv[];
{
int dev1;
char freq[100];
char ampl[100];
char tempstring[100];
if(argc != 2)
{
printf("usage: spec_meas gpib_id \n");
exit(1);
}
sprintf(tempstring,"%s",argv[1]);
dev1 = ibdev(0,atoi(tempstring),0,12,1,0);
ibwrt(dev1,"CALC:MARK:X?",12);
ibrd(dev1,freq,100);
printf("%s\n",freq);
sleep(3);
ibwrt(dev1,"CALC:MARK:Y?",12);
ibrd(dev1,ampl,100);
printf("%s\n",ampl);
}
