String based IO initialization for MRAA

Signed-off-by: Mihai Stefanescu <mihai.stefanescu@rinftech.com>
Signed-off-by: Noel Eck <noel.eck@intel.com>

examples/c/initio.c

@@ -0,0 +1,49 @@
+/*
+ * Author: Mihai Stefanescu <mihai.stefanescu@rinftech.com>
+ * Copyright (c) 2018 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 "mraa/initio.h"
+
+int
+main()
+{
+    printf("Starting example\n");
+
+    mraa_io_descriptor* desc;
+    if (mraa_io_init("g:3:1-upm_stuff", &desc) != MRAA_SUCCESS) {
+        printf("Error in mraa_io_init()\n");
+    }
+
+    printf("Leftover string = %s\n", desc->leftover_str);
+
+    /* Check value set in mraa_io_init. */
+    printf("Gpio value = %d\n", mraa_gpio_read(desc->gpios[0]));
+
+    if (mraa_io_close(desc) != MRAA_SUCCESS) {
+        printf("failed to close mraa io descriptor\n");
+    }
+
+    printf("Done\n");
+}