initial cleanup and mapping

examples/PiFace/reaction.c

@@ -0,0 +1,194 @@
+/*
+ * reaction.c:
+ *	Simple test for the PiFace interface board.
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include <wiringPi.h>
+#include <piFace.h>
+
+
+int outputs [4] = { 0,0,0,0 } ;
+
+#define	PIFACE	200
+
+/*
+ * light:
+ *	Light up the given LED - actually lights up a pair
+ *********************************************************************************
+ */
+
+void light (int led, int value)
+{
+  led *= 2 ;
+  digitalWrite (PIFACE + led + 0, value) ;
+  digitalWrite (PIFACE + led + 1, value) ;
+}
+
+/*
+ * lightAll:
+ *	All On or Off
+ *********************************************************************************
+ */
+
+void lightAll (int onoff)
+{
+  light (0, onoff) ;
+  light (1, onoff) ;
+  light (2, onoff) ;
+  light (3, onoff) ;
+}
+
+
+/*
+ * waitForNoButtons:
+ *	Wait for all buttons to be released
+ *********************************************************************************
+ */
+
+void waitForNoButtons (void)
+{
+  int i, button ;
+
+  for (;;)
+  {
+    button = 0 ;
+    for (i = 0 ; i < 4 ; ++i)
+      button += digitalRead (PIFACE + i) ;
+
+    if (button == 4)
+      break ;
+  }
+}
+
+
+void scanButton (int button)
+{
+  if (digitalRead (PIFACE + button) == LOW)
+  {
+    outputs [button] ^= 1 ;
+    digitalWrite (PIFACE + button, outputs [button]) ;
+  }
+
+  while (digitalRead (PIFACE + button) == LOW)
+    delay (1) ;
+}
+
+
+int main (void)
+{
+  int i, j ;
+  int led, button ;
+  unsigned int start, stop ;
+
+  printf ("Raspberry Pi PiFace Reaction Timer\n") ;
+  printf ("==================================\n") ;
+
+  if (piFaceSetup (PIFACE) == -1)
+    exit (1) ;
+
+// Enable internal pull-ups
+
+  for (i = 0 ; i < 8 ; ++i)
+    pullUpDnControl (PIFACE + i, PUD_UP) ;
+
+
+// Main game loop:
+//	Put some random LED pairs up for a few seconds, then blank ...
+
+  for (;;)
+  {
+    printf ("Press any button to start ... \n") ; fflush (stdout) ;
+
+    for (;;)
+    {
+      led = rand () % 4 ;
+      light (led, 1) ;
+      delay (10) ;
+      light (led, 0) ;
+
+      button = 0 ;
+      for (j = 0 ; j < 4 ; ++j)
+	button += digitalRead (PIFACE + j) ;
+
+      if (button != 4)
+	break ;
+    }
+
+    waitForNoButtons () ;
+
+    printf ("Wait for it ... ") ; fflush (stdout) ;
+
+    led = rand () % 4 ;
+    delay (rand () % 500 + 1000) ;
+    light (led, 1) ;
+
+    start = millis () ;
+    for (button = -1 ; button == -1 ; )
+    {
+      for (j = 0 ; j < 4 ; ++j)
+	if (digitalRead (PIFACE + j) == 0)	// Pushed
+	{
+	  button = j ;
+	  break ;
+	}
+    }
+    stop = millis () ;
+    button = 3 - button ; // Correct for the buttons/LEDs reversed
+
+    light (led, 0) ;
+
+    waitForNoButtons () ;
+
+    light (led, 1) ;
+
+    if (button == led)
+    {
+      printf ("You got it in %3d mS\n", stop - start) ;
+    }
+    else
+    {
+      printf ("Missed: You pushed %d - LED was %d\n", button, led) ;
+      for (;;)
+      {
+	light (button, 1) ;
+	delay (100) ;
+	light (button, 0) ;
+	delay (100) ;
+	i = 0 ;
+	for (j = 0 ; j < 4 ; ++j)
+	  i += digitalRead (PIFACE + j) ;
+	if (i != 4)
+	  break ;
+      }
+
+      waitForNoButtons () ;
+    }
+    light (led, 0) ;
+    delay (4000) ;
+  }
+
+  return 0 ;
+}