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demo/mmap: default to 'read' subdevice instead of subdevice 0

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If the '-s' option has not been specified, default to using the current
'read' subdevice if there is one instead of defaulting to subdevice 0.
Fall back to using subdevice 0 if there is no 'read' subdevice.
This commit is contained in:
Ian Abbott 2016-11-08 14:20:49 +00:00
parent c2cf7c8018
commit 1e8ca17ba9
1 changed files with 12 additions and 0 deletions
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12
demo/mmap.c
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@ -50,6 +50,7 @@ int main(int argc, char *argv[])
struct parsed_options options;
init_parsed_options(&options);
options.subdevice = -1;
parse_options(&options, argc, argv);
dev = comedi_open(options.filename);
@ -58,6 +59,17 @@ int main(int argc, char *argv[])
exit(1);
}
if(options.subdevice < 0) {
/* Subdevice not set on command line. */
/* Default to the 'read' subdevice (if any). */
options.subdevice = comedi_get_read_subdevice(dev);
if(options.subdevice < 0) {
/* No 'read' subdevice, so default to 0 instead. */
options.subdevice = 0;
}
fprintf(stderr, "defaulted to subdevice %d\n", options.subdevice);
}
ret = comedi_get_buffer_size(dev, options.subdevice);
if(ret < 0){
comedi_perror("comedi_get_buffer_size");