1.44inch LCD HAT
- 1 Introduction
- 2 Specification
- 3 Pinout
- 4 LCD and the controller
- 5 Working Protocol
- 6 Enable SPI interface
- 7 Install Libraries
- 8 Download Examples
- 9 Run the demo
- 10 FBCP Transplant
- 11 Others
- 12 Resources
- 13 Demo
- 14 Datasheet
- 15 FAQ
- 16 Support
1.44inch LCD HAT, SPI interfaces
- Operating voltage: 3.3V
- Interface: SPI
- LCD type: TFT
- Controller: ST7735S
- Resolution: 128*128 （Pixel）
- Display size: 25.5*26.5（mm）
- Pixel size: 0.129（W）*0.219（H）（MM）
- Dimension: 65 x 30.2(mm)
|PIN||Raspberry Pi Interface (BCM)||Description|
|Joystick UP||P6||Upward direction of the Joystick|
|Joystick Down||P19||Downward direction of the Joystick|
|Joystick Left||P5||Left direction of the Joystick|
|Joystick Right||P26||Right direction of the Joystick|
|Joystick Press||P13||Press the Joystick|
|SCLK||P11/SCLK||SPI clock line|
|MOSI||P10/MOS||SPI data line|
LCD and the controller
The ST7735S is a 132*162 pixel LCD controller, but the pixel of the 1.44inch LCD HAT is 128*128. So we have made some processing on the display: the horizontal direction starts from the second pixel, so that to guarantee the location of RAM in the LCD is consistent with the actual location at the same time.
This LCD accepts 8-bits/9-bits/16-bits/18-bits parallel interface, that are RGB444, RGB565, RGB666. The color format used in demo codes is RGB565.
This LCD use 4-lines SPI interface for reducing GPIO and fast speed.LCD
Note: Different from the traditional SPI protocol, the data line from the slave to the master is hidden since the device only has display requirement.
RESX Is the reset pin, it should be low when powering the module and be higher at other times;；
CSX is slave chip select, when CS is low, the chip is enabled.
D/CX is data/command control pin, when DC = 0, write command, when DC = 1, write data
SDA is the data pin for transmitting RGB data, it works as the MOSI pin of SPI interface;
SCL worka s the SCLK pins of SPI interface.
SPI communication has data transfer timing, which is combined by CPHA and CPOL.
CPOL determines the level of the serial synchronous clock at idle state. When CPOL = 0, the level is Low. However, CPOL has little effect to the transmission.
CPHA determines whether data is collected at the first clock edge or at the second clock edge of serial synchronous clock; when CPHL = 0, data is collected at the first clock edge.
There are 4 SPI communication modes. SPI0 is commonly used, in which CPHL = 0, CPOL = 0.
Enable SPI interface
- Open terminal, use command to enter the configuration page
sudo raspi-config Choose Interfacing Options -> SPI -> Yes to enable SPI interface
Please make sure that SPI interface was not used by other devices, you can check in the /boot/config.txt
- Install BCM2835 libraries
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.68.tar.gz tar zxvf bcm2835-1.68.tar.gz cd bcm2835-1.68/ sudo ./configure && sudo make && sudo make check && sudo make install
For more details, please refer to http://www.airspayce.com/mikem/bcm2835/
- Install Python libraries
sudo apt-get update sudo apt-get install python-pip sudo pip install RPi.GPIO sudo pip install spidev
Open Raspberry Pi terminal and run the following command
sudo apt-get install p7zip-full -y wget https://www.waveshare.com/w/upload/f/fa/1.44inch-LCD-HAT-Code.7z 7z x 1.44inch-LCD-HAT-Code.7z sudo chmod 777 -R 1.44inch-LCD-HAT-Code cd 1.44inch-LCD-HAT-Code/RaspberryPi/
Run the demo
cd c make clean make sudo ./main
- For Raspberry Pi 4B and system version after raspbian_lite-2019-06-20, please set as following for normal input:
sudo nano /boot/config.txt
And then add the following line at the end of the config.txt
cd python sudo python main.py sudo python key_demo.py
The Framebuffer uses a memory area to store the display content, and changes the data in the memory to change the display content.
There is an open-source project on github: fbcp-ili9341. Compared with other fbcp projects, this project uses partial refresh and DMA to achieve a refresh rate of up to 60fps.
Compile and Run
sudo apt-get install cmake -y cd ~ wget https://www.waveshare.com/w/upload/f/f9/Waveshare_fbcp.7z sudo apt-get install p7zip-full 7z x Waveshare_fbcp.7z cd waveshare_fbcp mkdir build cd build cmake -DSPI_BUS_CLOCK_DIVISOR=20 -DWAVESHARE_1INCH44_LCD_HAT=ON -DBACKLIGHT_CONTROL=ON -DSTATISTICS=0 .. make -j sudo ./fbcp
Auto-start when Power on
sudo cp ~/Fbcp-ili9341/build/fbcp-ili9341 /usr/local/bin/fbcp sudo nano /etc/rc.local
And then add fbcp& before exit 0, as the picture below.
Set the display resolution
Set the user interface display size in the /boot/config.txt file.
sudo nano /boot/config.txt
Then add the following lines at the end of the config.txt.
hdmi_force_hotplug=1 hdmi_cvt=300 300 60 1 0 0 0 hdmi_group=2 hdmi_mode=1 hdmi_mode=87 display_rotate=0
【Note】If you are using Raspberry Pi 4B, you need to comment out the following lines on the [pi4] part. The modification is as below:
[pi4] # Enable DRM VC4 V3D driver on top of the dispmanx display stack #dtoverlay=vc4-fkms-v3d #max_framebuffers=2
And then reboot the system
The final display effect is scaled and displayed on the 1.3inch LCD in proportion. The setting of the resolution here should be slightly larger than the LCD resolution, the too high resolution will cause the font display to be blurred.
After rebooting the system, the Raspberry Pi OS user interface will be displayed.
There are a joystick and three buttons on the panel of the module, which we can use to control the mouse of the Raspberry Pi
- Install the library, then download and run the demo
sudo apt-get install python-xlib sudo pip install PyMouse wget http://www.waveshare.net/w/upload/d/d3/Mouse.7z 7z x Mouse.7z sudo python mouse.py
【Note】The mouse.py needs to run under the graphical interface, which will not run under the SSH login. You can skip this step directly, the Pi will run the demo automatically by booting up.
- If you are using the Raspberry PI 4B and the version of your image is after raspbian_lite-2019-06-20, you need to set as below:
sudo nano /boot/config.txt
And then add the following line at the end of the config.txt.
Use the joystick to move up, down, left, and right, you can see that the mouse is moving.
- Set the auto-start when power on
cd .config/ mkdir autostart cd autostart/ sudo nano local.desktop
And then add the following lines at the end of the local.desktop
[Desktop Entry] Type=Application Exec=python /home/pi/mouse.py
Reboot the system, you can use the buttons to control the mouse.
If you are interested in getting a game console, you can refer to the following two links: