nunchuck: C port; FTI; C++ wraps C

Some API changes were made as well, see docs/apichanges.md.

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

examples/c/CMakeLists.txt

@@ -148,6 +148,7 @@ add_example (cjq4435)
 add_example (hmc5883l)
 add_example (wfs)
 add_example (enc03r)
+add_example (nunchuck)
 
 # Custom examples
 add_custom_example (nmea_gps_i2c-example-c nmea_gps_i2c.c nmea_gps)

examples/c/nunchuck.c

@@ -0,0 +1,84 @@
+/*
+ * 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 <upm_utilities.h>
+#include "nunchuck.h"
+
+bool shouldRun = true;
+
+void sig_handler(int signo)
+{
+    if (signo == SIGINT)
+        shouldRun = false;
+}
+
+int main(int argc, char **argv)
+{
+    signal(SIGINT, sig_handler);
+
+//! [Interesting]
+    // Instantiate a nunchuck controller bus 3
+    nunchuck_context sensor = nunchuck_init(3);
+
+    if (!sensor)
+    {
+        printf("%s: nunchuck_init() failed\n", __FUNCTION__);
+        return 1;
+    }
+
+    while (shouldRun)
+    {
+        if (nunchuck_update(sensor))
+        {
+            printf("%s: nunchuck_update() failed\n", __FUNCTION__);
+            nunchuck_close(sensor);
+            return 1;
+        }
+
+        int x, y, z;
+        nunchuck_get_stick(sensor, &x, &y);
+        printf("stickX: %d stickY: %d\n", x, y);
+
+        nunchuck_get_acceleration(sensor, &x, &y, &z);
+        printf("accelX: %d accelY: %d accelZ: %d\n", x, y, z);
+
+        bool bc, bz;
+        nunchuck_get_buttons(sensor, &bc, &bz);
+        printf("button C: %s\n",
+               ((bc) ? "pressed" : "not pressed"));
+        printf("button Z: %s\n\n",
+               ((bz) ? "pressed" : "not pressed"));
+
+        upm_delay_ms(100);
+    }
+
+    nunchuck_close(sensor);
+
+    //! [Interesting]
+    return 0;
+}