Itead 2.8 TFT Add-on V2.0 Touch

A small display, again one of those LCD screens attached via SPI. slow refresh, OS support frozen in time.

Instructions that worked for me, April 2020. 

https://www.itead.cc/blog/raspberry-pi-b-2-8-tft-add-on-v2-0-touch-function-realizing


Download Raspbian-2015-02-16.img into SD card, then launch Raspberry Pi B 
Its old Wheezy Debian, unsupported and outdated, so make sure you change to the legacy update, the official repository moved on. But there is a legacy repository!

Replace this line in /etc/apt/sources.list
deb http://legacy.raspbian.org/raspbian/ wheezy main contrib non-free rpi

Now you can do the 

sudo apt-get update

Do the usual raspi_config, add SPI support

sudo nano  /etc/modprobe.d/raspi-blacklist.conf
Comment the mask of spi out
#blacklist spi-bcm2708

Connect Raspberry Pi B+ 2.8 TFT Add-on V2.0 to Raspberry Pi B+ correctly

sudo apt-get install xinput evtest tslib libts-bin

Download the fbtft driver, and you may need to run the following command three times:
sudo REPO_URI=https://github.com/notro/rpi-firmware rpi-update

Finally get the codes:
*** Running pre-install script
Work around rpi-update issue #106
*** Updating firmware
*** Updating kernel modules
*** depmod 3.12.21+
*** Updating VideoCore libraries
*** Using HardFP libraries
*** Updating SDK
*** Running ldconfig
*** Storing current firmware revision
*** Running post-install script
/lib/firmware
*** Deleting downloaded files
*** Syncing changes to disk
*** If no errors appeared, your firmware was successfully updated to b77683205688d3f6ae2b32a3c7
f4e63de1c06a5d
*** A reboot is needed to activate the new firmware

By now,you need to reboot your Raspberry Pi B+
sudo reboot

sudo touch /usr/share/X11/xorg.conf.d/99-fbdev.conf

Configure the file /usr/share/X11/xorg.conf.d/99-fbdev.conf

sudo nano /usr/share/X11/xorg.conf.d/99-fbdev.conf

Section "Device"
  Identifier "itdb28"
  Driver "fbdev"
  Option "fbdev" "/dev/fb1"
EndSection

sudo modprobe fbtft_device name=itdb28 gpios=reset:5,dc:6,wr:12,cs:13,db00:20,db01:21,db02:22,d
b03:23,db04:24,db05:25,db06:26,db07:27 rotate=90 fps=50

Add the following contents to file /boot/config.txt
dtoverlay=ads7846,cs=1,speed=2000000,penirq=17,swapxy=1,xmin=230,xmax=3850,ymin=190,ymax=3850,p
max=255,xohms=100
startx &
 (you may have to reboot)

Load the touch driver
1.Add the following contents to file /boot/config.txt

dtoverlay=ads7846,cs=1,speed=2000000,penirq=17,swapxy=1,xmin=230,xmax=3850,ymin=190,ymax=3850,pmax=255,xohms=100
2.Reboot Raspberry Pi B+

sudo reboot
3.Load TFT display driver

sudo modprobe fbtft_device name=itdb28 gpios=reset:5,dc:6,wr:12,cs:13,db00:20,db01:21,db02:22,db03:23,db04:24,db05:25,db06:26,db07:27 rotate=90 fps=50
4.start up X Server

startx &
Adjust the X&Y directions of this touch screen
DISPLAY=:0 xinput --set-prop 'ADS7846 Touchscreen' 'Evdev Axis Inversion' 0 1
Test
·Check the event’s number which is in accord with the touch screen.

	cat /proc/bus/input/devices

This event’s number here is event3, then you need to execute the following command to do the calibration and test touch screen according to the event’s number you’ve got. When do calibrating, you’d better use touch pen to click the cross’s center unless you want a rough calibration result.

·Touch screen calibration

sudo TSLIB_FBDEVICE=/dev/fb1 TSLIB_TSDEVICE=/dev/input/event3 ts_calibrate

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