Modified readme and added license

Author: noah-jonathan rosa

README.md

@@ -7,7 +7,7 @@ This device uses alternatively I2C or UART to communicate. An I2C or UART instan
 
 ## Examples
 
-There are 4 examples with the  X-NUCLEO-GNSS1A1 library.
+There are 5 examples with the  X-NUCLEO-GNSS1A1 library.
 
 * X_NUCLEO_GNSS1A1_HelloWorld_I2C: This example code provides a simple command line interface
   to communicate with the sensor via I2C protocol
@@ -21,12 +21,19 @@ There are 4 examples with the  X-NUCLEO-GNSS1A1 library.
 * X_NUCLEO_GNSS1A1_MicroNMEA_UART: This example code shows how to communicate with the sensor via 
   UART protocol using the lightweight Arduino MicroNMEA library. 
 
+* X_NUCLEO_GNSS1A1_VirtualCOMPort: This example code should be uploaded to the board in order to perform a
+  firmware upgrade using the Flash Updater java application. 
+
 ## Dependencies
 
 The X-NUCLEO-GNSS1A1 library requires the following Arduino library:
 
 * MicroNMEA: https://github.com/stevemarple/MicroNMEA
 
+In order to perform the firmware upgrade, the following Java application should be used:
+
+* Flash Updater: https://github.com/stm32duino/Teseo-LIV3F-Flash-Updater
+
 ## Note
 
 The device works only in an outdoor enviroment with a clear view of the sky.

examples/X_NUCLEO_GNSS1A1_VirtualCOMPort/X_NUCLEO_GNSS1A1_VirtualCOMPort.ino

@@ -1,3 +1,47 @@
+/**
+ ******************************************************************************
+ * @file    X_NUCLEO_GNSS1A1_VirtualCOMPort.ino
+ * @author  AST
+ * @version V1.0.0
+ * @date    January 2018
+ * @brief   Arduino test application for the STMicrolectronics X-NUCLEO-GNSS1A1
+ *          GNSS module expansion board based on TeseoLIV3F.
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>&copy; COPYRIGHT(c) 2019 STMicroelectronics</center></h2>
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *   1. Redistributions of source code must retain the above copyright notice,
+ *      this list of conditions and the following disclaimer.
+ *   2. Redistributions in binary form must reproduce the above copyright notice,
+ *      this list of conditions and the following disclaimer in the documentation
+ *      and/or other materials provided with the distribution.
+ *   3. Neither the name of STMicroelectronics nor the names of its contributors
+ *      may be used to endorse or promote products derived from this software
+ *      without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ******************************************************************************
+ */
+ 
+//NOTE: for compatibility with the Arduino Due some additional cabling needs to be performed:
+//      pin D8 should be connected to pin D18 and pin D2 should be connected to pin D19
+
+//NOTE: this sketch should be uploaded in order to perform a Firmware Upgrade procedure using
+//      the Flash Updater Java tool provided at https://github.com/stm32duino/Teseo-LIV3F-Flash-Updater
+
 volatile uint8_t fromPC[16];
 volatile uint8_t fromGNSS[16];
 volatile unsigned long idxPC = 0;