Use to 3.5inch LCD Shield

Fully assembled 3.5inch display with 480×320 pixels TFT LCD and a resistive touch overlay. Just plug it on top of ODROID-C2/C1+/C0. XU4 needs the Shifter-Shield board to use this display.

You will need an official Ubuntu image to configure it. You can simply download the Kernel updates (via dist-upgrade) and configure your ODROID for this display shield.

Where to buy

Specifications

LCD TypeTFT
LCD InterfaceParallel 8-bit
LCD ControllerILI9488
LCD Active area48.96(H) x 73.44(V)mm
Touch Screen TypeResistive
Touch Screen ControllerSX865X(I2C)
BacklightLED
Resolution480*320(Pixel)
Board Size56(H) x 95(V) x 17(T)mm
ETC5pin RTC Shield connector

Schematic : 3.5inch_lcd_rev0.1.pdf

Used pins

Pin Num Symbol Description
1, 173.3VPower positive (3.3V power input)
2, 45VPower positive (5V power input)
3RTC_SDAI2C data bus for RTC
5RTC_SCLI2C clock for RTC
6, 9, 14, 20, 25, 30, 34, 39GNDGround
7RTC_INTInterrupt for RTC shield
8, 10, 26, 31, 35, 37NCNo connection
11/RSTBReset signal input terminal. Active at 'L'.
12/CSChip select signal input pin
13DB7Data bus
15DB6Data bus
16DB2Data bus
18DB0Data bus
19DB5Data bus
21DB4Data bus
22DB1Data bus
23DB3Data bus
24WRBWrite strobe signal
27TP_SDAI2C data bus for Touch controller
28TP_SCLI2C Clock for Touch controller
29RSRegister select signal.
32TP_NRSTReset for Touch controller
33LEDKBacklight GPIO
36TP_NIRQInterrupt for Touch controller
38VDD1V8Power positive (1.8V power input)
40SW ADCADC Input for Switches

GPIO pin map

Pin Num Name Export GPIO num
C2C1Shift shield on XU4
11 reset #247 #88 #174
29 dc #228 #101 #28
24 wr #229 #117 #190
12 cs #238 #87 #173
18 db00 #233 #102 #23
22 db01 #231 #103 #24
16 db02 #236 #104 #19
23 db03 #230 #105 #189
21 db04 #232 #106 #191
19 db05 #235 #107 #192
15 db06 #237 #115 #22
13 db07 #239 #116 #21

How to activate the 3.5inch LCD shield with your ODROID-C2/C1

You need a HDMI connection or a Serial/SSH console connection to follow below instruction.

Configuring framebuffer and Touch driver

0. Update your Kernel

sudo apt-get update 
sudo apt-get upgrade
sudo apt-get dist-upgrade

1. Insert modules

ODROID-C1/C2

sudo modprobe aml_i2c
sudo modprobe pwm-meson
sudo modprobe pwm-ctrl
sudo modprobe fbtft_device name=flexpfb rotate=270
sudo modprobe flexfb chip=ili9488
sudo modprobe sx865x

ODROID-XU4

First, To enable sx865x touch driver on ODROID-XU4 you need to fix a dtb as following commands.

sudo apt-get install device-tree-compiler
sudo cp /media/boot/exynos5422-odroidxu3.dtb /media/boot/exynos5422-odroidxu3.dtb.old
sudo fdtput -t s /media/boot/exynos5422-odroidxu3.dtb /hsi2c@12CB0000/sx865x@49 status "okay"
sudo reboot

Load modules

sudo modprobe fbtft_device name=flexpfb rotate=270
sudo modprobe flexfb chip=ili9488

You will have a new frame buffer /dev/fbX

Find a flexfb framebuffer node

ls /dev/fb*
/dev/fb2
cat /sys/class/graphics/fb2/name
flexfb

Run Console

0. Install package

sudo apt-get install fbset

1. backlight enable

ODROID-XU4 does not use PWM control

echo 500000 | sudo tee /sys/devices/platform/pwm-ctrl/freq0
echo 1 | sudo tee /sys/devices/platform/pwm-ctrl/enable0
echo 1023 | sudo tee /sys/devices/platform/pwm-ctrl/duty0

2. Run con2fbmap

con2fbmap <console> <framebuffer>

sudo con2fbmap 1 2

3. Change foreground virtual terminal

The command chvt N makes /dev/ttyN the foreground terminal.

sudo chvt 1

chvt 1 : console
chvt 7 : X11

4. Auto login on console

Edit tty1 service

sudo systemctl edit getty@tty1

And add

[Service]
ExecStart=
ExecStart=-/sbin/agetty -a odroid --noclear %I $TERM
odroid@odroid:~$ sudo systemctl cat getty@tty1 | grep Exec
ExecStart=-/sbin/agetty --noclear %I $TERM
ExecStart=
ExecStart=-/sbin/agetty -a odroid --noclear %I $TERM

Restart tty1 service

sudo systemctl restart getty@tty1

Run Xwindow

0. Create a new config file

sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.old
sudo rm -fr /etc/X11/xorg.conf.d/exynos.conf

Add following lines in “/etc/X11/xorg.conf” file.

Section "Device"
    Identifier    "C fbdev"
    Driver        "fbdev"
    Option        "fbdev" "/dev/fb2"
EndSection

1. Backlight enable

ODROID-XU4 does not use PWM control

echo 500000 | sudo tee /sys/devices/platform/pwm-ctrl/freq0
echo 1 | sudo tee /sys/devices/platform/pwm-ctrl/enable0
echo 1023 | sudo tee /sys/devices/platform/pwm-ctrl/duty0

2. Run

sudo /etc/init.d/lightdm start

Backlight control

ODROID-XU4 does not use PWM control

Set frequency & enable

echo 500000 | sudo tee /sys/devices/platform/pwm-ctrl/freq0
echo 1 | sudo tee /sys/devices/platform/pwm-ctrl/enable0

echo <0-1023> | sudo tee /sys/devices/platform/pwm-ctrl/duty0 =⇒ for back light brightness control

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

Touch Calibration

0. The xinput-calibrator pakage download

sudo apt-get install xinput-calibrator

1. Login

You need a login to get DISPLAY.
If you want auto login.
Edit /etc/lightdm/lightdm.conf file to enable auto-login: (password: odroid)

odroid@odroid:~$ sudo vi /etc/lightdm/lightdm.conf
[sudo] password for odroid: 
odroid@odroid:~$ cat /etc/lightdm/lightdm.conf 
[SeatDefaults]
autologin-user=odroid
autologin-user-timeout=0
odroid@odroid:~$ 

2. Check your DISPLAY

odroid@odroid:~$ w                                                              
09:13:31 up 35 min,  2 users,  load average: 0.09, 0.08, 0.12                  
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT             
odroid   ttySAC2                   08:42    2.00s  0.75s  0.02s w               
odroid   :0       :0               05:39   ?xdm?   1:15   0.63s mate-session    
odroid@odroid:~$

3. Run calibrator

If your display mode is portrait(rotate 0 or 180), run following command.

DISPLAY=:0 xinput set-prop 'SX865X Touchscreen' 'Evdev Axes Swap' 0

Run

DISPLAY=:0 xinput_calibrator

Follow the directions on your screen.
then, you will get something like


Copy to “/etc/X11/xorg.conf.d/99-calibration.conf”

sudo mkdir /etc/X11/xorg.conf.d/
sudo vi /etc/X11/xorg.conf.d/99-calibration.conf

4. Reboot

sudo reboot

Using keypad

There are four tact switches on LCD shield. And the switches change a value of adc when you preess the these.

sysfs node
C2 - /sys/class/saradc/ch0
C1 - /sys/class/saradc/saradc_ch0
XU4 - /sys/devices/12d10000.adc/iio\:device0/in_voltage3_raw

SBCswitch numADC value
C2/C1 SW1 5 ±10
SW2 515 ±10
SW3 680 ±10
SW4 770 ±10
XU4 SW1 0 ±100
SW2 2030 ±100
SW3 2695 ±100
SW4 3014 ±100

Build Wiring Pi

sudo apt-get install git
git clone https://github.com/hardkernel/wiringPi
cd wiringPi
./build

Build a source code

4 Keys on the shield will be mapped to “SPACE”, “UP”, “DOWN”, “ENTER” input event.

ODROID-C2/C1

tftlcd35_key.c

wget http://dn.odroid.com/source_peripherals/lcd35/tftlcd35_key.c

Compile & Run

gcc -o tftlcd35_key tftlcd35_key.c -lwiringPi -lwiringPiDev -lpthread
sudo ./tftlcd35_key &

ODROID-XU4

tftlcd35_key_xu4.c

wget http://dn.odroid.com/source_peripherals/lcd35/tftlcd35_key_xu4.c

Compile & Run

gcc -o tftlcd35_key_xu4 tftlcd35_key_xu4.c -lwiringPi -lwiringPiDev -lpthread
sudo ./tftlcd35_key_xu4 &

Auto Run

Applications

en/3.5inch_lcd_shield.txt · Last modified: 2017/04/07 09:20 by odroid
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