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.cpp

@@ -0,0 +1,101 @@
+/*
+ * Author: Brendan Le Foll <brendan.le.foll@intel.com>
+ * Contributors: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+ * Copyright (c) 2015 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: Prints "Hello Mraa!" recursively. Press Ctrl+C to exit
+ *
+ */
+
+/* standard headers */
+#include <iostream>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* mraa headers */
+#include "mraa/common.hpp"
+#include "mraa/uart.hpp"
+
+/* UART port */
+#define UART_PORT 0
+
+const char* dev_path = "/dev/ttyS0";
+
+volatile sig_atomic_t flag = 1;
+
+void
+sig_handler(int signum)
+{
+    if (signum == SIGINT) {
+        std::cout << "Exiting..." << std::endl;
+        flag = 0;
+    }
+}
+
+int
+main(void)
+{
+    signal(SIGINT, sig_handler);
+
+    //! [Interesting]
+    // If you have a valid platform configuration use numbers to represent uart
+    // device. If not use raw mode where std::string is taken as a constructor
+    // parameter
+    mraa::Uart* uart;
+    try {
+        uart = new mraa::Uart(UART_PORT);
+    } catch (std::exception& e) {
+        std::cerr << e.what() << ", likely invalid platform config" << std::endl;
+    }
+
+    try {
+        uart = new mraa::Uart(dev_path);
+    } catch (std::exception& e) {
+        std::cerr << "Error while setting up raw UART, do you have a uart?" << std::endl;
+        std::terminate();
+    }
+
+    if (uart->setBaudRate(115200) != mraa::SUCCESS) {
+        std::cerr << "Error setting parity on UART" << std::endl;
+    }
+
+    if (uart->setMode(8, mraa::UART_PARITY_NONE, 1) != mraa::SUCCESS) {
+        std::cerr << "Error setting parity on UART" << std::endl;
+    }
+
+    if (uart->setFlowcontrol(false, false) != mraa::SUCCESS) {
+        std::cerr << "Error setting flow control UART" << std::endl;
+    }
+
+    while (flag) {
+        /* send data through uart */
+        uart->writeStr("Hello Mraa!");
+
+        sleep(1);
+    }
+    //! [Interesting]
+
+    delete uart;
+
+    return EXIT_SUCCESS;
+}