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# Interfacing ST7789 LCD using SPI
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[Reference](https://raspberrypi.stackexchange.com/questions/105364/how-to-connect-st7789-lcd-to-raspberry-pi)
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## Technical Specifications
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* Display
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+ Resolution: 240 x 240 pixels
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+ Color : RGB Full Color
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+Interface : SPI
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* Operating Ratings
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+ DC Power Input : 3.3V
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+ Operating Current : \<30mA (typical)
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* Dimensions
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+ Module Size (PCB) : 39.5 x 28mm (1.56″ x 1.1″)
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+ Display diagonal : 33mm (1.3″)
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+ Display (W x H) : 26 x 26mm (1.02 x 1.02″)
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* Display Controller
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+ SH1106
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## Pinout
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st7789
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Label | Description
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------|-----
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BLK | Backlight Control. If left unconnected, the backlight is always on. Pull LOW to turn off
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DC | Data / Command. Determines type type of data being sent to the display. LOW = Command, HIGH = Data
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RES | Reset for the ST7789 LCD controller. Normally HIGH, pull LOW to reset
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SCK | Connects to SPI SCL (Clock)
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DIN | Connect to SPI MOSI (Data)
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VCC | Connect to 3.3V. This can come from the MCU or separate power supply
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GND | Connect to system ground. This ground needs to be in common with the MCU.
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Interfacing
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ST7789 | Pi | PinOut | Description
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-----|-----|----|-----
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VCC | 3V3 | 17 | 3V3
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GND | GND | 6 | Ground
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DIN | BCM 10 | 19 | SPI0 MOSI
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SCK | BCM 11 | 23 | SPI0 SCLK
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CS | BCM 7 | 26 | SPI0 CE1
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DC | BCM 9 | 21 | SPI0 MISO
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RES | BCM 19 | 35 | SPI1 MISO ?
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BL | BCM 27 | 13 | GPIO 2
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## [Sample Code](https://github.com/pimoroni/st7789-python.git)
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update pi
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```
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sudo apt-get update
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sudo apt-get install python-rpi.gpio python-spidev python-pip python-pil python-numpy
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```
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install python package
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```
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sudo pip install st7789
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```
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execute using python 2 sample in example folder
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```
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python scrolling-text.py
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```
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