ODROID-VU8C

8inch multi-touch screen for ODROID-C2 and C1+
It gives users the ability to create all-in-one, integrated projects such as tablets, game consoles, infotainment systems and embedded systems.

Where to buy

Specifications

  • 8-inch TFT-LCD
  • Resolution: 1024×768 pixels (4:3 ratio)
  • finger capacitive touch input (USB ID 18D1:4E12)
  • light brightness control with ODROID GPIO PWM
  • consumption : 700mA/5Volt (Only LCD and display controller)
  • Wide Viewing angle : Left 75, Right 75, Up 75, Down 75 degree
  • Dimensions : 189 x 149 x 29 mm
  • Viewable screen size : 162 x121.5 mm (active area)

Usage

Software settings

Touchscreen drivers are available with support for 10 touch points, and proper drivers are integrated in the latest Ubuntu and Android OS images.

1. Resolution configuration

Screen resolution must be configured to WVGA (1024×768) and the DVI option should be enabled.
If you use ODROID-C1/C1+/C0, you need to edit hdmi resolution and vout mode in boot.ini.
In case of ODROID-C2 and ODROID-N2, display auto detection mode can adjust those options by default without any change.

ODROID-C2

As aforementioned, you don't need to edit boot.ini with display auto detection mode that is default option on ODROID-C2.

# Auto Detection of Monitor settings based on your Screen information
# See: http://odroid.com/dokuwiki/doku.php?id=en:c2_auto_detect_display
setenv display_autodetect "true"

But if you want to use a manual mode, please refer to the following.

Ubuntu
# Auto detection
setenv display_autodetect "false"
 
# Resolutions
# setenv m "1080p"  # 1080P@60Hz
setenv m "1024x768p60hz"
 
# HDMI DVI/VGA modes
# By default its set to HDMI, if needed change below.
# Uncomment only a single Line.
setenv vout "dvi"
Android
# Resolutions
# setenv hdmimode "1080p60hz"
setenv hdmimode "1024x768p60hz"
 
# HDMI DVI/VGA modes
setenv vout_mode "dvi"
 
# Auto detection
setenv display_autodetect "false"
ODROID-C1/C1+/C0
Ubuntu
# setenv m "1080p"         # 1080P@60Hz
setenv m "1024x768p60hz"   # 1024x768
 
# HDMI DVI Mode Configuration
# setenv vout_mode "hdmi"
setenv vout_mode "dvi"
# setenv vout_mode "vga"
Android
# Resolutions
# setenv hdmimode "720p"
setenv hdmimode "1024x768p60hz"
 
# HDMI DVI/VGA modes
setenv vout_mode "dvi"
ODROID-N2

As aforementioned, you don't need to edit boot.ini with display auto detection mode that is default option on ODROID-N2.

# Auto Detection of Monitor settings based on your Screen information
setenv display_autodetect "true"

But if you want to use a manual mode, please refer to the following.

Ubuntu
# Auto detection
setenv display_autodetect "false"
 
# Resolutions
# setenv hdmimode "1080p60hz"  # 1080P@60Hz
setenv hdmimode "1024x768p60hz"
 
### Change voutmode to "dvi"
# setenv voutmode "hdmi"
setenv voutmode "dvi"
Android
# Resolutions
# setenv hdmimode "1080p60hz"
setenv hdmimode "1024x768p60hz"
 
# HDMI DVI/VGA modes
setenv voutmode "dvi"
 
# Auto detection
setenv display_autodetect "false"

2. Backlight ON/OFF

[ Ubuntu ]

Add the following lines into “/etc/rc.local”.

ODROID-C2
path="/sys/class/gpio"
echo 214 > $path/export
echo out > $path/gpio214/direction
echo 0 > $path/gpio214/value
ODROID-C1+/C1/C0
path="/sys/class/gpio"
echo 97 > $path/export
echo out > $path/gpio97/direction
echo 0 > $path/gpio97/value

[ Android ]

How to control backlight of the ODROID-VU5/7/7+/8C

3. Backlight control with PWM

GPIO configuration

ODROID-C2
cd /sys/class/gpio
echo 214 | sudo tee export
echo out | sudo tee gpio214/direction
echo 0 | sudo tee gpio214/value
echo 234 | sudo tee unexport
ODROID-C1+/C1/C0
cd /sys/class/gpio
echo 97 | sudo tee export
echo out | sudo tee gpio97/direction
echo 0 | sudo tee gpio97/value
echo 108 | sudo tee unexport

PWM configuration

[Ubuntu]

Load PWM driver modules. 

sudo modprobe pwm-meson
sudo modprobe pwm-ctrl

Ignore warning message of “pwm-ctrl pwm-ctrl: cannot export to PWM-1 : modprobe pwm-meson npwm=2”
Enable PWM via sysfs. 

echo 100000 | sudo tee /sys/devices/platform/pwm-ctrl/freq0
echo 1 | sudo tee /sys/devices/platform/pwm-ctrl/enable0

Set duty ratio (value can be 0 to 1023. Lower is brighter) 

echo 1023 | sudo tee /sys/devices/platform/pwm-ctrl/duty0
[Android]

Load PWM driver modules. 

root@odroidc2:/ # insmod /system/lib/modules/pwm-meson.ko npwm="1"
root@odroidc2:/ # insmod /system/lib/modules/pwm-ctrl.ko

Enable PWM via sysfs. 

root@odroidc2:/ # cd /sys/devices/pwm-ctrl.43/
root@odroidc2:/sys/devices/pwm-ctrl.43 # ls
driver
duty0
enable0
freq0
modalias
power
subsystem
uevent
root@odroidc2:/sys/devices/pwm-ctrl.43 # cat enable0
PWM_0 : off
root@odroidc2:/sys/devices/pwm-ctrl.43 # echo 1 > enable0
root@odroidc2:/sys/devices/pwm-ctrl.43 # cat enable0
PWM_0 : on

Set default frequency. 

root@odroidc2:/sys/devices/pwm-ctrl.43 # echo 100000 > freq0

Set duty ratio.
Value can be 0 to 1023 and lower value means brighter. 

root@odroidc2:/sys/devices/pwm-ctrl.43 # cat duty0
0
root@odroidc2:/sys/devices/pwm-ctrl.43 #echo 160 > duty0
root@odroidc2:/sys/devices/pwm-ctrl.43 # cat duty0
160

4. How to Set Auto Backlight On/Off by Monitor Status

Please refer to the following wiki page if you want to run auto backlight on/off control that is triggered by monitor on/off status.
back light control

Hardware assembling

Documents

ODROID-VU8C + XU4 Ass'y