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)
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

Programming

Two components are required in order to build applications for this board: the toolchain [2] and the SDK [3]. Both are provided by the SoC manufacturer.

The SDK contains headers and a hardware abstraction layer library (provided only as object files) that are required for the port to function.

The toolchain is available for Linux, Windows, and macOS hosts and instructions to obtain and set them up are available in the ESP-IDF repository, as explained in the ESP-IDF Programming Guide.

Set up build environment

With both the toolchain and SDK installed, the Zephyr build system must be instructed to use this particular variant by setting the following shell variables:

export ZEPHYR_TOOLCHAIN_VARIANT="espressif"
export ESPRESSIF_TOOLCHAIN_PATH="/path/to/xtensa-esp32-elf/"

Flashing

The usual flash target will work with the odroid_go board configuration. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b odroid_go samples/hello_world -- -DESP_IDF_PATH=/path/to/esp-idf/

Refer to Building an Application and Run an Application for more details.

All flashing options are handled by the West (Zephyr’s meta-tool) tool, including flashing with custom options such as a different serial port. The west tool supports specific options for the ESP32 board, as listed here:

--esp-idf-path ESP_IDF_PATH
 path to ESP-IDF
--esp-device ESP_DEVICE
 serial port to flash, default /dev/ttyUSB0
--esp-baud-rate ESP_BAUD_RATE
 serial baud rate, default 921600
--esp-flash-size ESP_FLASH_SIZE
 flash size, default “detect”
--esp-flash-freq ESP_FLASH_FREQ
 flash frequency, default “40m”
--esp-flash-mode ESP_FLASH_MODE
 flash mode, default “dio”
--esp-tool ESP_TOOL
 complete path to espidf, default is to search for it in [ESP_IDF_PATH]/components/esptool_py/esptool/esptool.py
--esp-flash-bootloader ESP_FLASH_BOOTLOADER
 Bootloader image to flash
--esp-flash-partition_table ESP_FLASH_PARTITION_TABLE
 Partition table to flash

For example, to flash to /dev/ttyUSB0, use the following command after having build the application in the build directory:

west flash -d build/ --skip-rebuild --esp-tool=/path/to/esp-idf/components/esptool_py/esptool/esptool.py --esp-device /dev/ttyUSB0

Connect ODROID-GO to your PC via the mini USB port and run your favorite terminal program to listen for output.

minicom -D /dev/ttyUSB0 -b 115200

Power off and then power on ODROID-GO. You should see the following message in your terminal:

Hello World! odroid_go