View source for 2inch LCD Module

{{Product|
|images=[[File:2inch-LCD-Module-6.jpg|400px]]
|categories=[[:Category:Modules|LCD/OLEDs/LCD]]
|interfaces={{Category|SPI}}
|brand=Waveshare
}}

==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
*The basic functions have been encapsulated on the demo, which can realize picture rotation, draw dots, lines, circles, rectangles, display English characters and Chinese characters, and display pictures.

===Specifications===
*Operating voltage: 3.3V/5V
*Interface: SPI
*LCD type: IPS
*Controller: ST7789V
*Resolution: 240(V) x 320(H)RGB
*Display size: 23.4（H）x 23.4（V）mm
*Pixel size: 0.0975（H）x 0.0975（V）mm
*Dimension: 58 x 35(mm)

===Interface===
{|border=1 style="text-align:center; width:600px"
|-style="background:green; color:white"
|'''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 LCD controllers, the communication method of the controller can be configured, they are usually using 8080 parallel interface, 3-line SPI, 4-line SPI, and other communication methods. This LCD uses a 4-line SPI interface for reducing GPIO and fast speed.LCD

===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.
{{2inch-LCD-Module-RaspberryPi-Guides}}
{{2inch-LCD-Module-STM32-Guides}}
{{2inch-LCD-Module-Arduino-Guides}}

==Resources==

===Document===
*[https://{{SERVERNAME}}/en/w/upload/e/ee/2inch_LCD_Module_SchDoc.pdf schematic]
*[https://{{SERVERNAME}}/en/w/upload/a/ad/ST7789VW.pdf Datasheet]

===Demo codes===
*[https://{{SERVERNAME}}/en/w/upload/1/19/2inch_LCD_Module_code.7z Demo codes]

===3D Drawing===
*[https://{{SERVERNAME}}/en/w/upload/9/93/2inch_LCD_Module_3D_Drawing.zip 2inch LCD Module 3D drawing]

==FAQ==
{{FAQ|'''1. '''The LCD keeps black when using it with Raspberry Pi?
| a) Please check that if you have enabled SPI interface
b)Check  BL pin, if BL pin has no output value, you can try to disconnect BL pin and test it again.
}}
{{FAQ|'''2.''' The python codes has error?
|Please install image libraries and test it again. Run command: '''sudo apt-get install python-imaging''' to install it and test again.
}}

==Supports==
{{Service}}