demo/cmd: bail out if fail to prepare command
Check return value of prepare_cmd_lib() and exit if less than 0. Also change prepare_cmd_lib() to write its error message to stderr instead of stdout.
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1 changed files with 6 additions and 3 deletions
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@ -109,8 +109,11 @@ int main(int argc, char *argv[])
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/* prepare_cmd_lib() uses a Comedilib routine to find a
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* good command for the device. prepare_cmd() explicitly
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* creates a command, which may not work for your device. */
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prepare_cmd_lib(dev, options.subdevice, options.n_scan, options.n_chan, 1e9 / options.freq, cmd);
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//prepare_cmd(dev, options.subdevice, options.n_scan, options.n_chan, 1e9 / options.freq, cmd);
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ret = prepare_cmd_lib(dev, options.subdevice, options.n_scan, options.n_chan, 1e9 / options.freq, cmd);
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//ret = prepare_cmd(dev, options.subdevice, options.n_scan, options.n_chan, 1e9 / options.freq, cmd);
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if(ret < 0){
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exit(1);
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}
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fprintf(stderr, "command before testing:\n");
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dump_cmd(stderr, cmd);
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@ -234,7 +237,7 @@ int prepare_cmd_lib(comedi_t *dev, int subdevice, int n_scan, int n_chan, unsign
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* that's bad. */
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ret = comedi_get_cmd_generic_timed(dev, subdevice, cmd, n_chan, scan_period_nanosec);
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if(ret<0){
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printf("comedi_get_cmd_generic_timed failed\n");
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fprintf(stderr,"comedi_get_cmd_generic_timed failed\n");
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return ret;
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}
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