examples: Cleanup C++ examples

Modify the C++ examples to be of same coding standard like C. As a
part of this cleanup, a new LED example is also added.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

examples/c++/uart_ow.cpp

@@ -0,0 +1,86 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.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.
+ *
+ * Example usage: Search and print the found OW device ID recursively.
+ *
+ */
+
+/* standard headers */
+#include <iostream>
+#include <stdlib.h>
+
+/* mraa headers */
+#include "mraa/common.hpp"
+#include "mraa/uart_ow.hpp"
+
+int
+main(void)
+{
+    mraa::Result status;
+    std::string id;
+    uint8_t count = 0;
+    uint8_t* ptr;
+
+    //! [Interesting]
+    mraa::UartOW uart(0);
+
+    // Reset the ow bus and see if anything is present
+    if ((status = uart.reset()) == mraa::SUCCESS) {
+        std::cout << "Reset succeeded, device(s) detected!" << std::endl;
+    } else {
+        std::cout << "Reset failed, returned " << int(status) << ". No devices on bus?" << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    std::cout << "Looking for devices..." << std::endl;
+
+    // start the search from scratch
+    id = uart.search(true);
+
+    if (id.empty()) {
+        std::cout << "No devices detected." << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    while (!id.empty()) {
+        // hack so we don't need to cast each element of the romcode
+        // for printf purposes
+        ptr = (uint8_t*) id.data();
+
+        // The first byte (0) is the device type (family) code.
+        // The last byte (7) is the rom code CRC value.  The
+        // intervening bytes are the unique 48 bit device ID.
+
+        std::cout << "Device %02d Type 0x%02x ID %02x%02x%02x%02x%02x%02x CRC 0x%02x" << count << ptr[0]
+                  << ptr[6] << ptr[5] << ptr[4] << ptr[3] << ptr[2] << ptr[1] << ptr[7] << std::endl;
+        count++;
+
+        // continue the search with start argument set to false
+        id = uart.search(false);
+    }
+
+    std::cout << "Exiting..." << std::endl;
+    //! [Interesting]
+
+    return EXIT_SUCCESS;
+}