Collision: Added C Src and Example

This module was initially known as GroveCollision. It has been
now changed to Collision. C source and examples added.

Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>

src/collision/collision.c

@@ -0,0 +1,60 @@
+
+/*
+ * Author: Zion Orent <sorent@ics.com>
+ *         Abhishek Malik <abhishek.malik@intel.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 "collision.h"
+
+collision_context collision_init(int pin){
+    collision_context dev =
+      (collision_context)malloc(sizeof(struct _collision_context));
+
+    if (!dev)
+      return NULL;
+
+    dev->gpio_pin = pin;
+    dev->gpio = mraa_gpio_init(dev->gpio_pin);
+
+    if(mraa_gpio_dir(dev->gpio, MRAA_GPIO_IN) != MRAA_SUCCESS)
+      {
+        free(dev);
+        return NULL;
+      }
+
+    return dev;
+}
+
+void collision_close(collision_context dev){
+    free(dev);
+}
+
+upm_result_t collision_is_colliding(collision_context dev, bool* collision_val){
+    int value = mraa_gpio_read(dev->gpio);
+
+    if(!value)
+        *collision_val = true;
+    else
+        *collision_val = false;
+
+    return UPM_SUCCESS;
+}