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add some error checking

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This commit is contained in:
David Schleef 2002-09-25 01:11:47 +00:00
parent 086659fc59
commit 5dae30af2f
1 changed files with 13 additions and 1 deletions
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14
demo/ao_waveform.c
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@ -117,7 +117,7 @@ int main(int argc, char *argv[])
parse_options(argc,argv);
/* Force n_chan to be 1 */
n_chan = 2;
n_chan = 1;
if(value){
waveform_frequency = value;
@ -163,6 +163,18 @@ int main(int argc, char *argv[])
dump_cmd(stdout,&cmd);
err = comedi_command_test(dev, &cmd);
if (err < 0) {
comedi_perror("comedi_command_test");
exit(1);
}
err = comedi_command_test(dev, &cmd);
if (err < 0) {
comedi_perror("comedi_command_test");
exit(1);
}
if ((err = comedi_command(dev, &cmd)) < 0) {
comedi_perror("comedi_command");
exit(1);