initial cleanup and mapping

examples/Gertboard/buttons.c

@@ -0,0 +1,83 @@
+/*
+ * buttons.c:
+ *	Read the Gertboard buttons. Each one will act as an on/off
+ *	tiggle switch for 3 different LEDs
+ *
+ * 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 <wiringPi.h>
+
+// Array to keep track of our LEDs
+
+int leds [] = { 0, 0, 0 } ;
+
+// scanButton:
+//	See if a button is pushed, if so, then flip that LED and
+//	wait for the button to be let-go
+
+void scanButton (int button)
+{
+  if (digitalRead (button) == HIGH)	// Low is pushed
+    return ;
+
+  leds [button] ^= 1 ; // Invert state
+  digitalWrite (4 + button, leds [button]) ;
+
+  while (digitalRead (button) == LOW)	// Wait for release
+    delay (10) ;
+}
+
+int main (void)
+{
+  int i ;
+
+  printf ("Raspberry Pi Gertboard Button Test\n") ;
+
+  wiringPiSetup () ;
+
+// Setup the outputs:
+//	Pins 3, 4, 5, 6 and 7 output:
+//	We're not using 3 or 4, but make sure they're off anyway
+//	(Using same hardware config as blink12.c)
+
+  for (i = 3 ; i < 8 ; ++i)
+  {
+    pinMode      (i, OUTPUT) ;
+    digitalWrite (i, 0) ;
+  }
+
+// Setup the inputs
+
+  for (i = 0 ; i < 3 ; ++i)
+  {
+    pinMode         (i, INPUT) ;
+    pullUpDnControl (i, PUD_UP) ;
+    leds [i] = 0 ;
+  }
+
+  for (;;)
+  {
+    for (i = 0 ; i < 3 ; ++i)
+      scanButton (i) ;
+    delay (1) ;
+  }
+}