.. _odroid_go:

ODROID-GO
#########

Overview
********

ODROID-GO Game Kit is a "Do it yourself" ("DIY") portable game console by
HardKernel. It features a custom ESP32-WROVER with 16 MB flash and it operates
from 80 MHz - 240 MHz [1]_.

The features include the following:

- Dual core Xtensa microprocessor (LX6), running at 80 -  240MHz
- 4 MB of PSRAM
- 802.11b/g/n/e/i
- Bluetooth v4.2 BR/EDR and BLE
- 2.4 inch 320x240 TFT LCD
- Speaker
- Micro SD card slot
- Micro USB port (battery charging and USB_UART data communication
- Input Buttons (Menu, Volume, Select, Start, A, B, Direction Pad)
- Expansion port (I2C, GPIO, SPI)
- Cryptographic hardware acceleration (RNG, ECC, RSA, SHA-2, AES)

.. figure:: img/odroid_go.jpg
        :align: center
        :alt: ODROID-GO

        ODROID-Go Game Kit

External Connector
------------------

+-------+------------------+-------------------------+
| PIN # | Signal Name      | ESP32-WROVER Functions  |
+=======+==================+=========================+
| 1     | GND              | GND                     |
+-------+------------------+-------------------------+
| 2     | VSPI.SCK (IO18)  | GPIO18, VSPICLK         |
+-------+------------------+-------------------------+
| 3     | IO12             | GPIO12                  |
+-------+------------------+-------------------------+
| 4     | IO15             | GPIO15, ADC2_CH3        |
+-------+------------------+-------------------------+
| 5     | IO4              | GPIO4, ADC2_CH0         |
+-------+------------------+-------------------------+
| 6     | P3V3             | 3.3 V                   |
+-------+------------------+-------------------------+
| 7     | VSPI.MISO (IO19) | GPIO19, VSPIQ           |
+-------+------------------+-------------------------+
| 8     | VSPI.MOSI (IO23) | GPIO23, VSPID           |
+-------+------------------+-------------------------+
| 9     | N.C              | N/A                     |
+-------+------------------+-------------------------+
| 10    | VBUS             | USB VBUS (5V)           |
+-------+------------------+-------------------------+

Supported Features
******************

The Zephyr odroid_go board configuration supports the following hardware
features:

+------------+------------+-------------------------------------+
| Interface  | Controller | Driver/Component                    |
+============+============+=====================================+
| UART       | on-chip    | serial port                         |
+------------+------------+-------------------------------------+
| GPIO       | on-chip    | gpio                                |
+------------+------------+-------------------------------------+
| PINMUX     | on-chip    | pinmux                              |
+------------+------------+-------------------------------------+
| I2C        | on-chip    | i2c                                 |
+------------+------------+-------------------------------------+
| SPI        | on-chip    | spi                                 |
+------------+------------+-------------------------------------+


System requirements
*******************

Prerequisites
-------------

Espressif HAL requires WiFi and Bluetooth binary blobs in order work. Run the command
below to retrieve those files.

.. code-block:: console

   west blobs fetch hal_espressif

.. note::

   It is recommended running the command above after :file:`west update`.

Building & Flashing
-------------------

Build and flash applications as usual (see :ref:`build_an_application` and
:ref:`application_run` for more details).

.. zephyr-app-commands::
   :zephyr-app: samples/hello_world
   :board: odroid_go
   :goals: build

The usual ``flash`` target will work with the ``odroid_go`` board
configuration. Here is an example for the :ref:`hello_world`
application.

.. zephyr-app-commands::
   :zephyr-app: samples/hello_world
   :board: odroid_go
   :goals: flash

Open the serial monitor using the following command:

.. code-block:: shell

   west espressif monitor

After the board has automatically reset and booted, you should see the following
message in the monitor:

.. code-block:: console

   ***** Booting Zephyr OS vx.x.x-xxx-gxxxxxxxxxxxx *****
   Hello World! odroid_go

Debugging
---------

As with much custom hardware, the ESP32 modules require patches to
OpenOCD that are not upstreamed yet. Espressif maintains their own fork of
the project. The custom OpenOCD can be obtained at `OpenOCD ESP32`_

The Zephyr SDK uses a bundled version of OpenOCD by default. You can overwrite that behavior by adding the
``-DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts>``
parameter when building.

Here is an example for building the :ref:`hello_world` application.

.. zephyr-app-commands::
   :zephyr-app: samples/hello_world
   :board: odroid_go
   :goals: build flash
   :gen-args: -DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts>

You can debug an application in the usual way. Here is an example for the :ref:`hello_world` application.

.. zephyr-app-commands::
   :zephyr-app: samples/hello_world
   :board: odroid_go
   :goals: debug

References
**********

.. target-notes::

.. [1] https://wiki.odroid.com/odroid_go/odroid_go
.. _`OpenOCD ESP32`: https://github.com/espressif/openocd-esp32/releases