Difference between revisions of "2inch LCD Module"

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==Hardware description==
 
==Hardware description==
 +
ST7789V supports RGB444, RGB565 and RGB666 three formats. This LCD uses RGB565.<br />
 +
For most of the LCD controller, there are several interfaces for choosing, this module we use SPI interface which is fast and simple.
 +
===Communication protocol===
 +
:[[File:2inch_LCD_Module_manual_1.png|700px]]
 +
Note: It is not like the tradition SPI protocol, it only uses MOSI to send data from master to slave for LCD display. For details please refer to Datasheet Page 105.
 +
 +
RESX: Reset, should be pull-down when power on, set to 1 other time.
 +
 +
CSX: Slave chip select. The chip is enabled only CS is set Low
 +
 +
D/CX: Data/Command selection; DC=0, write command; DC=1, write data
 +
 +
SDA: Data transmitted. (RGB data)
 +
 +
SCL: SPI clock
 +
 +
The SPI communication protocol of the data transmission uses control bits: clock phase (CPHA) and clock polarity (CPOL):
 +
 +
CPOL defines the level while the synchronization clock is idle. If CPOL=0, then it is LOW.
 +
 +
CPHA defines at whish clock’s tick the data transmission starts. CPHL=0 – at the first one, otherwise at the second one
 +
 +
This combination of two bits provides 4 modes of SPI data transmission. The commonly used is SPI0 mode, i.e. GPHL=0 and CPOL=0.
 +
 +
According to the figure above, data transmitting begins at the first falling edge, 8bit data are transmitted at one clock cycle. It is SPI0. MSB.
 +
 +
==Raspberry Pi examples==
 +
For Raspberry Pi we provide examples based on C and python
 +
===Enable SPI===
 +
Open terminal and run commands to enable SPI interface
 +
sudo raspi-config
 +
Choose Interfacing Options -> SPI -> Yes
 +
 +
Then reboot Raspberry Pi
 +
 +
===Libraries installation===
 +
*BCM2835
 +
<pre>
 +
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.60.tar.gz
 +
tar zxvf bcm2835-1.60.tar.gz
 +
cd bcm2835-1.60/
 +
sudo ./configure
 +
sudo make
 +
sudo make check
 +
sudo make install
 +
</pre>
 +
*WiringPi
 +
<pre>
 +
sudo apt-get install wiringpi
 +
cd /tmp
 +
wget https://project-downloads.drogon.net/wiringpi-latest.deb
 +
sudo dpkg -i wiringpi-latest.deb
 +
gpio -v
 +
</pre>
 +
*Python2
 +
<pre>
 +
sudo apt-get updata
 +
sudo apt-get install python-pip
 +
sudo pip install RPi.GPIO
 +
sudo pip install spidev
 +
sudo apt-get install python-imaging
 +
</pre>
 +
*Python3
 +
<pre>
 +
sudo apt-get update
 +
sudo apt-get install python3-pip
 +
sudo pip3 install RPi.GPIO
 +
sudo pip3 install spidev
 +
sudo apt-get install python3-imaging
 +
</pre>
 +
===Hardware connection===
 +
:[[File:2inch-LCD-Module-3.jpg|600px]]
 +
{|border="1" style="text-align:center; width:600px"
 +
|-style="background:green; color:white"
 +
|'''2inch LCD'''|| '''Board number'''||'''BCM number'''
 +
|-
 +
|VCC||5V||5V
 +
|-
 +
|GND||GND||GND
 +
|-
 +
|DIN||19||MOSI
 +
|-
 +
|CLK||23||SCLK
 +
|-
 +
|CS||24||CE0
 +
|-
 +
|DC||22||P25
 +
|-
 +
|RST||13||P27
 +
|-
 +
|BL||12||P18
 +
|}
  
 
==Resources==
 
==Resources==

Revision as of 03:51, 18 November 2019

2inch LCD Module
2inch LCD Module
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Instruction

This is a general LCD display Module, IPS screen, 2inch diagonal, 240×320 resolution, with embedded controller, communicating via SPI interface

Feature

  • SPI interface, requires minimum GPIO for controlling
  • Comes with development resources and manual

Specifications

  • Driver: ST7789
  • Interface: SPI
  • Display color: RGB, 262K color
  • Resolution: 240×320
  • Backlight: LED
  • Operating voltage: 3.3V

Interface

SYMBOL Description
VCC Power (3.3V input)
GND Ground
DIN SPI data input
CLK SPI clock input
CS Chip selection, low active
DC Data/Command selection (high for data, low for command)
RST Reset, low active
BL Backlight

Hardware description

ST7789V supports RGB444, RGB565 and RGB666 three formats. This LCD uses RGB565.
For most of the LCD controller, there are several interfaces for choosing, this module we use SPI interface which is fast and simple.

Communication protocol

2inch LCD Module manual 1.png

Note: It is not like the tradition SPI protocol, it only uses MOSI to send data from master to slave for LCD display. For details please refer to Datasheet Page 105.

RESX: Reset, should be pull-down when power on, set to 1 other time.

CSX: Slave chip select. The chip is enabled only CS is set Low

D/CX: Data/Command selection; DC=0, write command; DC=1, write data

SDA: Data transmitted. (RGB data)

SCL: SPI clock

The SPI communication protocol of the data transmission uses control bits: clock phase (CPHA) and clock polarity (CPOL):

CPOL defines the level while the synchronization clock is idle. If CPOL=0, then it is LOW.

CPHA defines at whish clock’s tick the data transmission starts. CPHL=0 – at the first one, otherwise at the second one

This combination of two bits provides 4 modes of SPI data transmission. The commonly used is SPI0 mode, i.e. GPHL=0 and CPOL=0.

According to the figure above, data transmitting begins at the first falling edge, 8bit data are transmitted at one clock cycle. It is SPI0. MSB.

Raspberry Pi examples

For Raspberry Pi we provide examples based on C and python

Enable SPI

Open terminal and run commands to enable SPI interface

sudo raspi-config

Choose Interfacing Options -> SPI -> Yes

Then reboot Raspberry Pi

Libraries installation

  • BCM2835
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.60.tar.gz
tar zxvf bcm2835-1.60.tar.gz 
cd bcm2835-1.60/
sudo ./configure
sudo make
sudo make check
sudo make install
  • WiringPi
sudo apt-get install wiringpi
cd /tmp
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
  • Python2
sudo apt-get updata
sudo apt-get install python-pip 
sudo pip install RPi.GPIO
sudo pip install spidev
sudo apt-get install python-imaging
  • Python3
sudo apt-get update
sudo apt-get install python3-pip
sudo pip3 install RPi.GPIO
sudo pip3 install spidev
sudo apt-get install python3-imaging

Hardware connection

2inch-LCD-Module-3.jpg
2inch LCD Board number BCM number
VCC 5V 5V
GND GND GND
DIN 19 MOSI
CLK 23 SCLK
CS 24 CE0
DC 22 P25
RST 13 P27
BL 12 P18

Resources

Document

Demo codes

FAQ

...

Supports

Support

If you require technical support, please go to the Support page and open a ticket.