WiringPi: Bring back all of the stuffs I removed to do with peripherals

Imported from the official WiringPi repository, version 2.60.

Signed-off-by: Deokgyu Yang <secugyu@gmail.com>
Change-Id: I82dc00ab9f038f9bc4c6a9c4ca3affe5a5d33ae1
diff --git a/examples/blink8-drcn.c b/examples/blink8-drcn.c
new file mode 100644
index 0000000..96c775b
--- /dev/null
+++ b/examples/blink8-drcn.c
@@ -0,0 +1,61 @@
+/*
+ * blink8-drcn.c:
+ *	Simple sequence over the first 8 GPIO pins - LEDs
+ *	Aimed at the Ladder board, but it's fairly generic.
+ *
+ * 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 <drcNet.h>
+
+int main (void)
+{
+  int i, led ;
+
+  printf ("Raspberry Pi - 8-LED Sequencer\n") ;
+  printf ("==============================\n") ;
+  printf ("\n") ;
+  printf ("Connect LEDs to the first 8 GPIO pins and watch ...\n") ;
+
+  int pinBase = 100 ;
+
+//  wiringPiSetup () ;
+  drcSetupNet (pinBase, 100, "192.168.254.21", "6124", "123456") ;
+
+  for (i = 0 ; i < 8 ; ++i)
+    pinMode (i + pinBase, OUTPUT) ;
+
+  for (;;)
+  {
+    for (led = 0 ; led < 8 ; ++led)
+    {
+      digitalWrite (led + pinBase, 1) ;
+      delay (10) ;
+    }
+
+    for (led = 0 ; led < 8 ; ++led)
+    {
+      digitalWrite (led + pinBase, 0) ;
+      delay (10) ;
+    }
+  }
+}