LED: Added C Src and Example

Changed from Grove LED to LED.

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

src/led/led.c

@@ -0,0 +1,62 @@
+/*
+ * Author: Brendan Le Foll <brendan.le.foll@intel.com>
+ * Contributions: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
+ * Contributions: Sarah Knepper <sarah.knepper@intel.com>
+ *                Abhishek Malik <abhishek.malik@intel.com>
+ * Copyright (c) 2016 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 "led.h"
+#include "upm_types.h"
+
+led_context led_init(uint8_t pin){
+    led_context dev =
+      (led_context)malloc(sizeof(struct _led_context));
+
+    if (!dev)
+      return NULL;
+
+    dev->led_pin = pin;
+    dev->gpio = mraa_gpio_init(dev->led_pin);
+
+    if (mraa_gpio_dir(dev->gpio, MRAA_GPIO_OUT) != MRAA_SUCCESS)
+      return NULL;
+
+    return dev;
+}
+
+void led_close(led_context dev){
+    free(dev);
+}
+
+upm_result_t led_on(led_context dev){
+    if (mraa_gpio_write(dev->gpio, 1) != MRAA_SUCCESS)
+        return UPM_ERROR_OPERATION_FAILED;
+
+    return UPM_SUCCESS;
+}
+
+upm_result_t led_off(led_context dev){
+    if (mraa_gpio_write(dev->gpio, 0) != MRAA_SUCCESS)
+        return UPM_ERROR_OPERATION_FAILED;
+
+    return UPM_SUCCESS;
+}