Button: Adding C sources and C examples

This commit adds C sources and examples for the button sensor.

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

examples/c/CMakeLists.txt

@@ -135,6 +135,8 @@ add_example (buzzer)
 add_example (ppd42ns)
 add_example (guvas12d)
 add_example (otp538u)
+add_example (button)
+add_example (button_intr)
 
 # Custom examples
 add_custom_example (nmea_gps_i2c-example-c nmea_gps_i2c.c nmea_gps)

examples/c/button.c

@@ -0,0 +1,59 @@
+/*
+ * Authors: 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "button.h"
+
+#include "upm_utilities.h"
+#include "mraa.h"
+
+int counter;
+
+void button_isr(void *arg){
+    counter++;
+}
+
+int main()
+{
+    counter = 0;
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
+    button_context dev = button_init(2);
+
+    button_install_isr(dev, MRAA_GPIO_EDGE_RISING, button_isr, NULL);
+    while(1){
+        printf("Interrupts: %d\n", counter);
+        upm_delay(3);
+    }
+
+    return 0;
+}

examples/c/button_intr.c

@@ -0,0 +1,54 @@
+/*
+ * Authors: Abhishek Malik <abhishek.malik@intel.com>
+ * Copyright (c) 2014 - 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "button.h"
+
+#include "upm_utilities.h"
+#include "mraa.h"
+
+int main()
+{
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
+    button_context dev = button_init(2);
+    bool abc = 0;
+    while(1){
+        if(button_get_value(dev, &abc) != UPM_SUCCESS){
+            printf("an error has occured\n");
+        }
+        upm_delay(1);
+        printf("value retrieved: %d\n", abc);
+    }
+
+    return 0;
+}