# Interfacing ST7789 LCD using SPI

[Reference](https://raspberrypi.stackexchange.com/questions/105364/how-to-connect-st7789-lcd-to-raspberry-pi)

## Technical Specifications

* Display 
  + Resolution: 240 x 240 pixels
  + Color 	  : RGB Full Color
  +Interface  :	SPI 
* Operating Ratings 
  + DC Power Input    : 	3.3V
  + Operating Current :	\<30mA (typical)
* Dimensions 		
  + Module Size (PCB) 	: 39.5 x 28mm (1.56″ x 1.1″)
  + Display diagonal 	: 33mm (1.3″)
  + Display (W x H) 	: 26 x 26mm (1.02 x 1.02″)
* Display Controller
  + SH1106

## Pinout

st7789

Label | Description
------|-----
BLK | Backlight Control.  If left unconnected, the backlight is always on.  Pull LOW to turn off
DC | Data / Command.  Determines type type of data being sent to the display.  LOW = Command, HIGH = Data
RES | Reset for the ST7789 LCD controller.  Normally HIGH, pull LOW to reset
SCK | Connects to SPI SCL (Clock)
DIN | Connect to SPI MOSI (Data)
VCC |  Connect to 3.3V.  This can come from the MCU or  separate power supply
GND | Connect to system ground.  This ground needs to be in common with the MCU.


Interfacing

ST7789 | Pi  | PinOut | Description
-----|-----|----|-----
VCC  | 3V3    | 17 | 3V3
GND  | GND    | 6 | Ground
DIN  | BCM 10 | 19 | SPI0 MOSI
SCK  | BCM 11 | 23  | SPI0 SCLK
CS   | BCM 7  | 26  | SPI0 CE1
DC   | BCM 9  | 21  | SPI0 MISO
RES  | BCM 19 | 35  | SPI1 MISO ?
BL   | BCM 27 | 13  | GPIO 2

![](SPI.PNG)

## [Sample Code](https://github.com/pimoroni/st7789-python.git)

update pi

```
sudo apt-get update
sudo apt-get install python-rpi.gpio python-spidev python-pip python-pil python-numpy

```

install python package

```
sudo pip install st7789
```

execute using python 2 sample in example folder

```
python scrolling-text.py
```