Raspberry Pi: TFT 3.5" setup

3.5 inch Touch Screen TFT LCD Designed for Raspberry Pi

1. Expand the filesystem

sudo raspi-config

2. Change fb0 to fb1

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

3. Enable SPI if needed

# remove or comment out the spi blacklist line
sudo nano /etc/modprobe.d/raspi-blacklist.conf

4. FBTFT drivers as loadable modules

sudo REPO_URI=https://github.com/notro/rpi-firmware rpi-update
sudo reboot

5. Test

sudo modprobe flexfb width=480 height=320 regwidth=16 init=-1,0xb0,0x0,-1,0x11,-2,250,-1,0x3A,0x55,-1,0xC2,0x44,-1,0xC5,0x00,0x00,0x00,0x00,-1,0xE0,0x0F,0x1F,0x1C,0x0C,0x0F,0x08,0x48,0x98,0x37,0x0A,0x13,0x04,0x11,0x0D,0x00,-1,0xE1,0x0F,0x32,0x2E,0x0B,0x0D,0x05,0x47,0x75,0x37,0x06,0x10,0x03,0x24,0x20,0x00,-1,0xE2,0x0F,0x32,0x2E,0x0B,0x0D,0x05,0x47,0x75,0x37,0x06,0x10,0x03,0x24,0x20,0x00,-1,0x36,0x28,-1,0x11,-1,0x29,-3
sudo modprobe fbtft_device debug=3 rotate=0 name=flexfb speed=16000000 gpios=reset:25,dc:24

6. Perminantly add Driver

sudo nano /etc/modules

#Add to file /etc/modules
flexfb width=480 height=320 regwidth=16 init=-1,0xb0,0x0,-1,0x11,-2,250,-1,0x3A,0x55,-1,0xC2,0x44,-1,0xC5,0x00,0x00,0x00,0x00,-1,0xE0,0x0F,0x1F,0x1C,0x0C,0x0F,0x08,0x48,0x98,0x37,0x0A,0x13,0x04,0x11,0x0D,0x00,-1,0xE1,0x0F,0x32,0x2E,0x0B,0x0D,0x05,0x47,0x75,0x37,0x06,0x10,0x03,0x24,0x20,0x00,-1,0xE2,0x0F,0x32,0x2E,0x0B,0x0D,0x05,0x47,0x75,0x37,0x06,0x10,0x03,0x24,0x20,0x00,-1,0x36,0x28,-1,0x11,-1,0x29,-3
fbtft_device debug=3 rotate=0 name=flexfb speed=16000000 gpios=reset:25,dc:24

7. Additional settings

 sudo nano /boot/config.txt

#config.txt
gpu_mem=128

and

sudo nano /boot/cmdline.txt

Insert before "rootwait"

#cmdline.txt
fbcon=map:1 fbcon=font:ProFont6x11

8. Re-enable SPI

sudo raspi-config

9. Touch Screen

sudo apt-get -y install xinput evtest libts-bin

10. Edit /etc/modules

sudo nano /etc/modules

# Touchscreen
ads7846_device model=7846 cs=1 gpio_pendown=17 keep_vref_on=1 swap_xy=1 pressure_max=255 x_plate_ohms=60 x_min=200 x_max=3900 y_min=200 y_max=3900

11. Touchscreen calibration

 wget http://adafruit-download.s3.amazonaws.com/xinput-calibrator_0.7.5-1_armhf.deb
 sudo dpkg -i -B xinput-calibrator_0.7.5-1_armhf.deb

Create a new touch screen calibration config file for X

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

 Section "InputClass"
     Identifier "calibration"
     MatchProduct "ADS7846 Touchscreen"
     Option "Calibration" "3930 89 141 3920"
     Option "SwapAxes" "0"
 EndSection

sudo reboot

12. Recalibrate

If you need to recalibrate.
Before to start it, you have to delete (if exist) /usr/share/X11/xorg.conf.d/99-calibration.conf

DISPLAY=:0.0 xinput_calibrator

13. Force the screen to stay on

sudo nano /etc/lightdm/lightdm.conf

Add the following lines to the [SeatDefaults] section:

#don't sleep the screen
xserver-command=X -s 0 dpms

More info

New way!

1.) Get dtc compiler with overlay support:

wget -c https://raw.githubusercontent.com/RobertCNelson/tools/master/pkgs/dtc.sh
chmod +x dtc.sh
sudo ./dtc.sh

2.) Clone repo onto your pi

git clone https://github.com/swkim01/waveshare-dtoverlays.git

3.) According to your LCD's type, copy the overlay file waveshare32b-overlay.dtb or waveshare35b-overlay.dtb to /boot/overlays as root
In case of waveshare 3.2" LCD

sudo cp waveshare-dtoverlays/waveshare32b-overlay.dtb /boot/overlays/

or if linux 4.4 kernel or newer,

sudo cp waveshare-dtoverlays/waveshare32b-overlay.dtb /boot/overlays/waveshare32b.dtbo

In case of waveshare 3.5/4" LCD

sudo cp waveshare-dtoverlays/waveshare35a-overlay.dtb /boot/overlays/

or if linux 4.4 kernel or newer,

sudo cp waveshare-dtoverlays/waveshare35a-overlay.dtb /boot/overlays/waveshare35a.dtbo

4.) Specify this overlay file in your /boot/config.txt

dtoverlay=waveshare32b

or

dtoverlay=waveshare35a

You can configure some parameters of the lcd module like this:

dtoverlay=waveshare32b:rotate=270
dtoverlay=waveshare35a:rotate=90,swapxy=1

5.) reboot your raspberry pi