Q100

PIN OUT

PIN	Raspberry Pi Interface (BCM)	Description
SCLK	P11/SCLK	SPI clock line
MOSI	P10/MOS	SPI data line
CS	P8/CE0	Chip selection
DC	P25	Data/Command control
RST	NOT USE	Reset
BL	P27	Backlight

LCD and the controller

The ST7789VW is a single-chip controller/driver for 262K-color, graphic type TFT-LCD. It consists of 240 source line and 320 gate line driving circuits. The resolution of this LCD is 240 (H) RGB x 240(V), it supports horizontal mode and vertical mode, and it doesn't use all the RAM of the controller.

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 a 4-line SPI interface for reducing GPIO and fast speed.LCD

LCD Working Protocol

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.

NVMe SSD boot tutorial

Reter to NVMe SSD boot with the Raspberry Pi 5

LCD display tutorial

Enable SPI interface

Reter to How to enable SPI

sudo raspi-config
Choose Interfacing Options -> SPI -> Yes  to enable SPI interface

Install lgpio liberery

PS: If you use the bookworm system, you can only use lgpio library, bcm2835 and wiringPi can't be installed and used

#Open the Raspberry Pi terminal and run the following command
wget https://github.com/joan2937/lg/archive/master.zip
unzip master.zip
cd lg-master
sudo make install

# You can refer to the official website for more: https://github.com/gpiozero/lg

Install Python

sudo apt-get update
sudo apt-get install python3-pip
sudo apt-get install python3-pil
sudo apt-get install python3-numpy
sudo pip3 install spidev

Download Examples

Open the Raspberry Pi terminal and run the following command:

sudo apt-get install p7zip-full -y
wget https://sourceforge.net/projects/u-geek/files/HATs//Raspi_M2_HAT/Raspi_M2_HAT_code.7z
7z x Raspi_M2_HAT_code.7z -r -o./Raspi_M2_HAT_code
sudo chmod 777 -R Raspi_M2_HAT_code
cd Raspi_M2_HAT_code

Run the demo:

sudo python stats.py

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Anonymous user #1

9 days ago

Score 0

I am once again asking how to get in contact WITH ANY SUPPORT PERSON WHATSOEVER IN REGARDS TO A FAULTY X882-A1 CONNECTOR. POTENTIAL BUYERS be aware this is what they are putting their customers through. I have tried other means of communication only to be ignored.

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