Add documentation

Adds documentation for the firmware update process

Author: santaimpersonator

flex_boards/SparkPNT_GNSS_Flex_Module_ZED-X20P-Tilt/docs/assets/img/hookup_guide/assembly-firmware_update-alt.jpg

@@ -0,0 +1,92 @@
+## Hardware Assembly
+The simplest method to update the firmware on the ZED-X20P GNSS receiver, is through its `UART1` interface with the u-center 2 software application. Users can either utilize the [GNSS Flex breakout board](../SparkFun_GNSS_Flex_Breakout/index.md) or a [USB-to-serial adapter](https://www.sparkfun.com/sparkfun-serial-basic-breakout-ch340c-and-usb-c.html) to access the `UART1` interface of the ZED-X20P GNSS receiver.
+
+
+!!! warning "HPG v2.00 Firmware"
+	As of HPG v2.02, firmware updates can be performed with either the `UART1`, I^2^C, or SPI interfaces of the ZED-X20P. However, with the original HPG v2.00 firmware, firmware updates could only be performed through the `UART1` interface.
+
+
+<div class="grid" markdown>
+
+<div markdown>
+
+<figure markdown>
+[![UART connection](./assets/img/hookup_guide/assembly-firmware_update.jpg){ width="400" }](./assets/img/hookup_guide/assembly-firmware_update.jpg "Click to enlarge")
+<figcaption markdown>Connecting to the `UART1` interface with the Flex breakout board.</figcaption>
+</figure>
+
+</div>
+
+
+<div markdown>
+
+<figure markdown>
+[![UART connection](./assets/img/hookup_guide/assembly-firmware_update-alt.jpg){ width="400" }](./assets/img/hookup_guide/assembly-firmware_update-alt.jpg "Click to enlarge")
+<figcaption markdown>Connecting to the `UART1` interface through the GNSS Flex headers, using a [USB-to-serial adapter](https://www.sparkfun.com/sparkfun-serial-basic-breakout-ch340c-and-usb-c.html).</figcaption>
+</figure>
+
+</div>
+
+</div>
+
+
+??? tip "GNSS Flex Headers"
+	Below, is a table of the pin connections between the `UART1` interface of the GNSS Flex headers and a [USB-to-serial adapter](https://www.sparkfun.com/sparkfun-serial-basic-breakout-ch340c-and-usb-c.html). Additionally, we have provided a diagram of the pin locations on the GNSS Flex header.
+
+
+	<div class="grid" markdown>
+
+	<div style="text-align: center;" markdown>
+
+	| GNSS Flex Header Pins | USB-to-Serial Adapter |
+	| :----: | :---: |
+	| `3V3`  | `3V3` |
+	| `GND`  | `GND` |
+	| `TXD1` | `RXI` |
+	| `RXD1` | `TXO` |
+
+	</div>
+
+
+	<div markdown>
+
+	<figure markdown>
+	[![GNSS Fex header connections](./assets/img/hookup_guide/headers-firmware_update.png){ width="400" }](./assets/img/hookup_guide/headers-firmware_update.png "Click to enlarge")
+	<figcaption markdown>The GNSS Flex header pins for the `UART1` interface of the ZED-X20P GNSS Flex module.</figcaption>
+	</figure>
+
+	</div>
+
+	</div>
+
+
+	!!! note
+		The ZED-X20P GNSS receiver requires 3.3V to power the module.
+
+
+
+!!! info
+	For more information, please reference the [user manual](https://www.u-blox.com/en/info/u-center-2-user-guide#93-updating-firmware).
+
+
+!!! example "Example - I^2^C Interface"
+	For those curious, we have found that it is possible to [update the firmware through the I^2^C interface](https://community.sparkfun.com/t/how-to-update-gnss-flex-phat-zed-x20p-firmware-with-u-center-2/67090/9) of the ZED-X20P GNSS receiver.
+
+
+
+## u-center 2 Application
+Users will need to [connect to the ZED-X20P GNSS Flex module](https://www.u-blox.com/en/info/u-center-2-user-guide#32-connecting-a-device) in the u-center 2 application. Once connected, select the **Firmware update** tool from the **Tools and Services** panel; then, follow the instructions outlined in the [user manual](https://www.u-blox.com/en/info/u-center-2-user-guide#93-updating-firmware). Otherwise, users can also follow this instructional video from u-blox.
+
+
+<div class="video" style="text-align: center; margin: auto;" markdown>
+<iframe src="https://www.youtube.com/embed/RonjsBTdW3A" title="Firmware update on u-center 2 (ver. 23.03.)" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+![QR code](./assets/img/qr_code/video-firmware_update.png){ .qr width="85" }
+</div>
+
+
+!!! info
+	For the latest firmware, please check the [u-blox ZED-X20P product page](https://www.u-blox.com/en/product/zed-x20p-module?legacy=Current#Documentation-&-resources).
+
+
+!!! tip
+	If the ZED-X20P is in the safe boot mode, it requires a training sequence to be enabled during the firmware update process.

flex_boards/SparkPNT_GNSS_Flex_Module_ZED-X20P-Tilt/docs/assets/img/hookup_guide/assembly-firmware_update.jpg

@@ -19,5 +19,6 @@ nav:
     - Enable GPS L5: l5_signal.md
     - Configuration Settings: configuration_interface.md
     - UBX Protocol: ubx_protocol.md
+    - Firmware Update: firmware_update.md
   - Troubleshooting Tips: troubleshooting_tips.md
   - Resources: resources.md