New demo program.

diff --git a/demo/choose_filter.c b/demo/choose_filter.c
new file mode 100644 (file)
index 0000000..787d689
--- /dev/null
+++ b/demo/choose_filter.c
@@ -0,0 +1,65 @@
+/*
+ * INSN_CONFIG_FILTER example
+ * Part of Comedilib
+ *
+ * Copyright (c) 1999,2000 David A. Schleef <ds@schleef.org>
+ * Copyright (c) 2007 Frank Mori Hess <fmhess@users.sourceforge.net>
+ *
+ * This file may be freely modified, distributed, and combined with
+ * other software, as long as proper attribution is given in the
+ * source code.
+ */
+/*
+ * Requirements:  A board with a subdevice that supports
+ *    INSN_CONFIG_FILTER, such as the PFI subdevice on an NI m-series
+ *    or 660x board.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <comedilib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <getopt.h>
+#include <ctype.h>
+#include "examples.h"
+
+
+comedi_t *device;
+
+int main(int argc, char *argv[])
+{
+       int retval;
+       lsampl_t filter_selection;
+       struct parsed_options options;
+
+       init_parsed_options(&options);
+       parse_options(&options, argc, argv);
+
+       device = comedi_open(options.filename);
+       if(!device){
+               comedi_perror(options.filename);
+               exit(-1);
+       }
+       filter_selection = options.value;
+       printf("Selecting filter %d on subdevice %d channel %d.\n", filter_selection, options.subdevice, options.channel);
+       comedi_insn insn;
+       lsampl_t data[2];
+       memset(&insn, 0, sizeof(comedi_insn));
+       insn.insn = INSN_CONFIG;
+       insn.subdev = options.subdevice;
+       insn.chanspec = options.channel;
+       insn.data = data;
+       insn.n = sizeof(data) / sizeof(data[0]);
+       data[0] = INSN_CONFIG_FILTER;
+       data[1] = filter_selection;
+
+       retval = comedi_do_insn(device, &insn);
+       if(retval < 0) comedi_perror("comedi_do_insn");
+       return retval;
+}
+