initial cleanup and mapping

examples/PiFace/metro.c

@@ -0,0 +1,111 @@
+/*
+ * metronome.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 <string.h>
+
+#include <wiringPi.h>
+#include <piFace.h>
+
+#define	PIFACE	200
+
+/*
+ * middleA:
+ *	Play middle A (on the relays - yea!)
+ *********************************************************************************
+ */
+
+static void middleA (void)
+{
+  unsigned int next ;
+
+  for (;;)
+  {
+    next = micros () + 1136 ;
+    digitalWrite (PIFACE + 0, 0)  ;
+    digitalWrite (PIFACE + 1, 0)  ;
+    while (micros () < next)
+      delayMicroseconds (1) ;
+    
+    next = micros () + 1137 ;
+    digitalWrite (PIFACE + 0, 1)  ;
+    digitalWrite (PIFACE + 1, 1)  ;
+    while (micros () < next)
+      delayMicroseconds (1) ;
+    
+  }
+}
+
+
+int main (int argc, char *argv [])
+{
+  int bpm, msPerBeat, state = 0 ;
+  unsigned int end ;
+
+  printf ("Raspberry Pi PiFace Metronome\n") ;
+  printf ("=============================\n") ;
+
+  piHiPri (50) ;
+
+  wiringPiSetupSys () ;	// Needed for timing functions
+  piFaceSetup      (PIFACE) ;
+
+  if (argc != 2)
+  {
+    printf ("Usage: %s <beates per minute>\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  if (strcmp (argv [1], "a") == 0)
+    middleA () ;
+
+  bpm = atoi (argv [1]) ;
+
+  if ((bpm < 40) || (bpm > 208))
+  {
+    printf ("%s range is 40 through 208 beats per minute\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  msPerBeat = 60000 / bpm  ;
+
+// Main loop:
+//	Put some random LED pairs up for a few seconds, then blank ...
+
+  for (;;)
+  {
+    end = millis ()  + msPerBeat ;
+
+    digitalWrite (PIFACE + 0, state)  ;
+    digitalWrite (PIFACE + 1, state)  ;
+
+    while (millis () < end)
+      delayMicroseconds (500) ;
+
+    state ^= 1 ;
+  }
+
+  return 0 ;
+}