initial cleanup and mapping

examples/PiFace/buttons.c

@@ -0,0 +1,103 @@
+/*
+ * buttons.c:
+ *	Simple test for the PiFace interface board.
+ *
+ *	Read the buttons and output the same to the 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>
+#include <piFace.h>
+
+int outputs [4] = { 0,0,0,0 } ;
+
+// Use 200 as the pin-base for the PiFace board
+
+#define	PIFACE_BASE	200
+
+
+/*
+ * scanButton:
+ *	Read the guiven button - if it's pressed, then flip the state
+ *	of the correspoinding output pin
+ *********************************************************************************
+ */
+
+void scanButton (int button)
+{
+  if (digitalRead (PIFACE_BASE + button) == LOW)
+  {
+    outputs [button] ^= 1 ;
+    digitalWrite (PIFACE_BASE + button, outputs [button]) ;
+    printf ("Button %d pushed - output now: %s\n",
+		button, (outputs [button] == 0) ? "Off" : "On") ;
+  }
+
+  while (digitalRead (PIFACE_BASE + button) == LOW)
+    delay (1) ;
+}
+
+
+/*
+ * start here
+ *********************************************************************************
+ */
+
+int main (void)
+{
+  int pin, button ;
+
+  printf ("Raspberry Pi wiringPi + PiFace test program\n") ;
+  printf ("===========================================\n") ;
+  printf ("\n") ;
+  printf (
+"This program reads the buttons and uses them to toggle the first 4\n"
+"outputs. Push a button once to turn an output on, and push it again to\n"
+"turn it off again.\n\n") ;
+
+// Always initialise wiringPi. Use wiringPiSys() if you don't need
+//	(or want) to run as root
+
+  wiringPiSetupSys () ;
+
+  piFaceSetup (PIFACE_BASE) ;
+
+// Enable internal pull-ups & start with all off
+
+  for (pin = 0 ; pin < 8 ; ++pin)
+  {
+    pullUpDnControl (PIFACE_BASE + pin, PUD_UP) ;
+    digitalWrite    (PIFACE_BASE + pin, 0) ;
+  }
+
+// Loop, scanning the buttons
+
+  for (;;)
+  {
+    for (button = 0 ; button < 4 ; ++button)
+      scanButton (button) ;
+    delay (5) ;
+  }
+
+  return 0 ;
+}