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Raspberry Pi B+ 2.8 TFT Add-on V2.0 Touch Function Realizing

We’ve received many support tickets for asking how to make Raspberry Pi B+ 2.8 TFT Add-on V2.0 touchable. In this blog, we will demonstrate how to make Raspberry Pi B+ 2.8 TFT Add-on V2.0 show desktop upon Raspberry Pi B+ and its touch function.

Preparation

·Download Raspbian-2015-2-15.img into SD card, then launch Raspberry Pi B+
·Ensure your network connection working well
·Connect Raspberry Pi B+ 2.8 TFT Add-on V2.0 to Raspberry Pi B+ correctly

Install rpi-update and fbtft driver (intallation under the Raspberry Pi B+)

1.Before install the needed software, please do the configuration first. Raspberry Pi Software Configuration

sudo raspi-config

Enable Device Tree,SPI

2.Enter into the file /etc/modprobe.d/raspi-blacklist.conf

sudo vi /etc/modprobe.d/raspi-blacklist.conf

3.Comment the mask of spi out

#blacklist spi-bcm2708

4.Install the necessary software

sudo apt-get update
sudo apt-get install xinput evtest tslib libts-bin

5.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

Finnally got 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 b77683205688d3f6ae2b32a3c7f4e63de1c06a5d
*** A reboot is needed to activate the new firmware  

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

sudo reboot

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

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

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

Configure content as below:

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

Load the 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
startx &

Now, the desktop of Raspberry Pi B+ is demonstrated on the 2.8 TFT Add-on V2.0. However, you can’t use the touch function by now. Let’s do the following steps to make it can do.

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

Now, ctrl+c to return back to the Raspberry Pi desktop, and you are free to use mouse or touch pen to control the cursor.