rotaryencoder: add C driver and example; FTI; C++ wraps C

Signed-off-by: Jon Trulson <jtrulson@ics.com>

examples/c/CMakeLists.txt

@@ -125,6 +125,7 @@ add_example (biss0001)
 add_example (bmi160)
 add_example (jhd1313m1)
 add_example (lm35)
+add_example (rotaryencoder)
 
 # Custom examples
 add_custom_example (nmea_gps_i2c-example-c nmea_gps_i2c.c nmea_gps)

examples/c/rotaryencoder.c

@@ -0,0 +1,69 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2015 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 <stdio.h>
+#include <signal.h>
+
+#include "rotaryencoder.h"
+#include "upm_utilities.h"
+
+int shouldRun = true;
+
+void sig_handler(int signo)
+{
+    if (signo == SIGINT)
+        shouldRun = false;
+}
+
+
+int main()
+{
+    signal(SIGINT, sig_handler);
+
+//! [Interesting]
+    // Instantiate a Grove Rotary Encoder, using signal pins D2 and D3
+    rotaryencoder_context sensor = rotaryencoder_init(2, 3);
+
+    if (!sensor)
+    {
+        printf("rotaryencoder_init() failed.\n");
+        return 1;
+    }
+
+    while (shouldRun)
+    {
+        printf("Position: %d\n", rotaryencoder_get_position(sensor));
+
+        upm_delay_ms(100);
+    }
+
+
+    printf("Exiting...\n");
+
+    rotaryencoder_close(sensor);
+
+//! [Interesting]
+    return 0;
+}