Added info that '-n' is used to select the waveform.

diff --git a/demo/ao_waveform.c b/demo/ao_waveform.c
index fef1d2c208cf8cd1bc72bfd60e828e0523c9ec73..02c88639f6cf3a8ac1a60f7107ec9a7c923d8979 100644 (file)
--- a/demo/ao_waveform.c
+++ b/demo/ao_waveform.c
@@ -106,12 +106,13 @@ int main(int argc, char *argv[])
 
        init_parsed_options(&options);
        options.subdevice = -1;
-       options.n_chan = 0;     /* default waveform */
+       options.n_chan = -1;    /* waveform */
        parse_options(&options, argc, argv);
 
        /* Use n_chan to select waveform (cheat!) */
        fn = options.n_chan;
        if(fn < 0 || fn >= NUMFUNCS){
+               fprintf(stderr,"Use the option '-n' to select another waveform.\n");
                fn = 0;
        }
 
@@ -158,7 +159,8 @@ int main(int argc, char *argv[])
 
        dds_init(waveform_frequency, options.freq, fn);
 
-       dump_cmd(stdout,&cmd);
+       if (options.verbose) 
+               dump_cmd(stdout,&cmd);
 
        err = comedi_command_test(dev, &cmd);
        if (err < 0) {
@@ -189,7 +191,8 @@ int main(int argc, char *argv[])
                        "See the --write-buffer option of comedi_config\n", n);
                exit(1);
        }
-       printf("m=%d\n",m);
+       if (options.verbose)
+               printf("m=%d\n",m);
 
        ret = comedi_internal_trigger(dev, options.subdevice, 0);
        if(ret < 0){
@@ -206,7 +209,8 @@ int main(int argc, char *argv[])
                                perror("write");
                                exit(0);
                        }
-                       printf("m=%d\n",m);
+                       if (options.verbose)
+                               printf("m=%d\n",m);
                        n-=m;
                }
                total+=BUF_LEN;