Merge branch 'master' of https://git.ece.iastate.edu/jdkruege/May1624-Wireless-Controller

Development/Software/buttonInterrupt.c

+/*
+ * buttonInterrupt.c
+ *
+ *  Created on: Feb 10, 2016
+ *      Author: Nik
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <mraa.h>
+
+static volatile int counter = 1;
+
+void interrupt(void* args) {
+    fprintf(stdout, "%d\n", counter);
+    counter++;
+}
+
+int buttonInterrupt() {
+
+	//initialize mraa
+    mraa_init();
+
+    //create mraa context
+    mraa_gpio_context context;
+
+    //set context to GPIO 15 (J20:7)
+    context = mraa_gpio_init(15);
+
+    if (context == NULL) {
+        return -1;
+    } else {
+    	fprintf(stdout, "GPIO Initialized\n");
+    }
+
+    mraa_gpio_dir(context, MRAA_GPIO_IN);
+
+    mraa_gpio_edge_t edge = MRAA_GPIO_EDGE_FALLING;
+
+    mraa_gpio_isr(context, edge, &interrupt, NULL);
+
+   // mraa_result_t result = mraa_gpio_isr_exit(context);
+
+   // return result;
+
+    return 0;
+}