WFS: Added water flow sensor without grove dependency

Signed-off-by: Sisinty Sasmita Patra <sisinty.s.patra@intel.com>

examples/c++/CMakeLists.txt

@@ -212,6 +212,7 @@ add_example (zfm20)
 add_example (zfm20-register)
 add_example (uln200xa)
 add_example (grovewfs)
+add_example (wfs)
 add_example (isd1820)
 add_example (sx6119)
 add_example (si114x)

examples/c++/wfs.cxx

@@ -0,0 +1,78 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2014 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <unistd.h>
+#include <iostream>
+#include <signal.h>
+#include "wfs.hpp"
+
+using namespace std;
+
+int shouldRun = true;
+
+void sig_handler(int signo)
+{
+  if (signo == SIGINT)
+    shouldRun = false;
+}
+
+
+int main()
+{
+  signal(SIGINT, sig_handler);
+
+//! [Interesting]
+  // Instantiate a Water Flow Sensor on digital pin D2
+  upm::WFS* flow = new upm::WFS(2);
+  
+  // set the flow counter to 0 and start counting
+  flow->clearFlowCounter();
+  flow->startFlowCounter();
+
+  while (shouldRun)
+    {
+      // we grab these (,illis and flowCount) just for display
+      // purposes in this example
+      uint32_t millis = flow->getMillis();
+      uint32_t flowCount = flow->flowCounter();
+
+      float fr = flow->flowRate();
+
+      // output milliseconds passed, flow count, and computed flow rate
+      cout << "Millis: " << millis << " Flow Count: " << flowCount;
+      cout << " Flow Rate: " << fr << " LPM" << endl;
+
+      // best to gather data for at least one second for reasonable
+      // results.
+      sleep(2);
+    }
+
+  flow->stopFlowCounter();
+//! [Interesting]
+
+  cout << "Exiting..." << endl;
+
+  delete flow;
+  return 0;
+}