Extend the Quad Encoder test

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4396 42af7a65-404d-4744-a932-0658087f49c3

examples/README.txt

@@ -932,6 +932,10 @@ examples/qencoder
     and this value is ignored.  Otherwise, this number of samples is
     collected and the program terminates.  Default:  Samples are collected
     indefinitely.
+  CONFIG_EXAMPLES_QENCODER_DELAY - This value provides the delay (in
+    milliseonds) between each sample.  If CONFIG_NSH_BUILTIN_APPS
+    is defined, then this value is the default delay if no other delay is
+    provided on the command line.  Default:  100 milliseconds
 
 examples/rgmp
 ^^^^^^^^^^^^^

examples/qencoder/qe.h

@@ -55,6 +55,10 @@
  *   and this value is ignored.  Otherwise, this number of samples is
  *   collected and the program terminates.  Default:  Samples are collected
  *   indefinitely.
+ * CONFIG_EXAMPLES_QENCODER_DELAY - This value provides the delay (in
+ *   milliseonds) between each sample.  If CONFIG_NSH_BUILTIN_APPS
+ *   is defined, then this value is the default delay if no other delay is
+ *   provided on the command line.  Default:  100 milliseconds
  */
 
 #ifndef CONFIG_QENCODER
@@ -65,6 +69,10 @@
 #  define CONFIG_EXAMPLES_QENCODER_DEVPATH "/dev/qe0"
 #endif
 
+#ifndef CONFIG_EXAMPLES_QENCODER_DELAY
+#  define CONFIG_EXAMPLES_QENCODER_DELAY 100
+#endif
+
 /* Debug ********************************************************************/
 
 #ifdef CONFIG_CPP_HAVE_VARARGS
@@ -92,8 +100,9 @@
 #ifdef CONFIG_NSH_BUILTIN_APPS
 struct qe_example_s
 {
-  bool reset;
+  bool         reset;  /* True: set the count back to zero */
-  int  nloops;
+  unsigned int nloops; /* Collect this number of samples */
+  unsigned int delay;  /* Delay this number of seconds between samples */
 };
 #endif
 

examples/qencoder/qe_main.c

@@ -99,9 +99,10 @@ static void qe_help(void)
 {
   message("\nUsage: qe [OPTIONS]\n\n");
   message("OPTIONS include:\n");
-  message("  [-n samples] number of samples\n");
+  message("  [-n samples] Number of samples\n");
-  message("  [-r] reset the count\n");
+  message("  [-t msec]    Delay between samples (msec)\n");
-  message("  [-h] shows this message and exits\n\n");
+  message("  [-r]         Reset the position to zero\n");
+  message("  [-h]         Shows this message and exits\n\n");
 }
 #endif
 
@@ -157,6 +158,7 @@ void parse_args(int argc, FAR char **argv)
 
   g_qeexample.reset  = false;
   g_qeexample.nloops = 1;
+  g_qeexample.delay  = CONFIG_EXAMPLES_QENCODER_DELAY;
 
   for (index = 1; index < argc; )
     {
@@ -177,7 +179,19 @@ void parse_args(int argc, FAR char **argv)
                 exit(1);
               }
 
-            g_qeexample.nloops = (int)value;
+            g_qeexample.nloops = (unsigned int)value;
+            index += nargs;
+            break;
+
+          case 't':
+            nargs = arg_decimal(&argv[index], &value);
+            if (value < 0 || value > INT_MAX)
+              {
+                message("Sample delay out of range: %ld\n", value);
+                exit(1);
+              }
+
+            g_qeexample.delay = (unsigned int)value;
             index += nargs;
             break;
 
@@ -298,6 +312,14 @@ int MAIN_NAME(int argc, char *argv[])
         {
           message(MAIN_STRING "  %d\n", position);
         }
+
+      /* Delay a little bit */
+
+#if defined(CONFIG_NSH_BUILTIN_APPS)
+      usleep(g_qeexample.delay * 1000);
+#else
+      usleep(CONFIG_EXAMPLES_QENCODER_DELAY * 1000);
+#endif
     }
 
 errout_with_dev: