added some comments, including advice on how to make interrupt handler run at hard...

diff --git a/demo/cmd.c b/demo/cmd.c
index ea544e43e9ac55a9989f62993d398d4a2a79e845..33ddb0f2e2d0bbcbe851c29945669ad25e563a74 100644 (file)
--- a/demo/cmd.c
+++ b/demo/cmd.c
@@ -86,6 +86,9 @@ void do_cmd(comedi_t *dev,comedi_cmd *cmd)
 
        dump_cmd(cmd);
 
+       /* restoring the chanlist stuff in this way is only required
+        * for comedi versions before 0.7.56
+        */ 
        cmd->chanlist =         chanlist;
        cmd->chanlist_len =     n_chans;
 
@@ -149,6 +152,10 @@ void do_cmd_1(comedi_t *dev)
 
        /* flags */
        cmd.flags =     0;
+       /* the TRIG_RT flag will ask that the driver's interrupt handler be
+        * run at hard real time priority if you have a real time OS
+        */ 
+       //cmd.flags |= TRIG_RT; 
 
        /* each event requires a trigger, which is specified
           by a source and an argument.  For example, to specify