added comment

diff --git a/demo/cmd.c b/demo/cmd.c
index e535cc78f1ed2ef0ad8322fbe35413d24c507b5a..3181d9e3bc1d0d48ce527bbf2cb6dcaf0f34b9d9 100644 (file)
--- a/demo/cmd.c
+++ b/demo/cmd.c
@@ -118,6 +118,12 @@ static void do_cmd(comedi_t *dev,comedi_cmd *cmd)
        }
 }
 
+/*
+ * This part of the demo measures channels 1, 2, 3, 4 at a rate of
+ * 10 khz, with the inter-sample time at 10 us (100 khz).  The number
+ * of scans measured is 10.  This is analogous to the old mode2
+ * acquisition.
+ */
 static void do_cmd_1(comedi_t *dev)
 {
        comedi_cmd cmd;
@@ -153,14 +159,14 @@ static void do_cmd_1(comedi_t *dev)
         * events occur periodically at a rate of scan_begin_arg
         * nanoseconds between scans. */
        cmd.scan_begin_src =    TRIG_TIMER;
-       cmd.scan_begin_arg =    1000000;        /* in ns */
+       cmd.scan_begin_arg =    100000; /* in ns */
 
        /* The timing between each sample in a scan is controlled
         * by convert.  Like above, TRIG_TIMER specifies that
         * convert events occur periodically at a rate of convert_arg
         * nanoseconds between scans. */
        cmd.convert_src =       TRIG_TIMER;
-       cmd.convert_arg =       100000;         /* in ns */
+       cmd.convert_arg =       10000;          /* in ns */
 
        /* The end of each scan is almost always specified using
         * TRIG_COUNT, with the argument being the same as the