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ST7789_AVR
Fast SPI library for the ST7789 IPS display optimized for AVR Arduinos
Replaces obsolete Arduino_ST7789_Fast: https://github.com/cbm80amiga/Arduino_ST7789_Fast
Significantly optimized for 16MHz AVR Arduino boards (2.5-5x faster than other libraries).
Achieved 7.1Mbps SPI transfer rate (at DIV2/16MHz clock).
In compatiliblity mode it should work with other MCUs, but I didn't test all configurations.
For STM32 (BluePill) there is separate optimized version here: https://github.com/cbm80amiga/Arduino_ST7789_STM
YouTube video:
YouTube playlist with all videos related to ST7789:
https://www.youtube.com/playlist?list=PLxb1losWErZ7thUyB05phRR3DoiYN_kcD
Configuration
Use #define COMPATIBILITY_MODE - then the library should work on all Arduino compatible boards
Remove above define for the best performance on 16MHz AVR
Use #define CS_ALWAYS_LOW for LCD boards where CS pin is internally connected to the ground, it gives better performance
Tested with Arduino IDE 1.6.5 and Adafruit_GFX 1.5.6
Extra Features
- invertDisplay()
- sleepDisplay()
- enableDisplay()
- idleDisplay() - saves power by limiting colors to 3 bit mode (8 colors)
- resetDisplay() - software reset
- partialDisplay() and setPartArea() - limiting display area for power saving
- setScrollArea() and setScroll() - smooth vertical scrolling
- fast drawImage() from RAM
- fast drawImage() from flash (PROGMEM)
Tested displays:
- 240x240 1.3" IPS (without CS pin)
| Circuit | Front | Back |
|---|---|---|
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- 240x240 1.54" IPS (with CS pin)
| Circuit | Front | Back |
|---|---|---|
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 |
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- 240x280 1.69" IPS
| Circuit | Front | Back |
|---|---|---|
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 |
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- 170x320 1.9" IPS
| Circuit | Front | Back |
|---|---|---|
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 |
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- 240x320 2.0" IPS
| Circuit | Front | Back |
|---|---|---|
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 |
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- 240x320 2.8" TFT? - use inverseDisplay(1)
| Circuit | Front | Back |
|---|---|---|
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Connections:
Without CS (1.3" only) - use CS_ALWAYS_LOW
| LCD pin | LCD pin name | Arduino |
|---|---|---|
| #01 | GND | GND |
| #02 | VCC | VCC (3.3V only!) |
| #03 | SCL | D13/SCK |
| #04 | SDA | D11/MOSI |
| #05 | RES | D9 or any digital |
| #06 | DC | D10 or any digital |
| #07 | BLK | NC |
With CS - don't use CS_ALWAYS_LOW
| LCD pin | LCD pin name | Arduino |
|---|---|---|
| #01 | GND | GND |
| #02 | VCC | VCC (3.3V only!) |
| #03 | SCL | D13/SCK |
| #04 | SDA | D11/MOSI |
| #05 | RES | optional |
| #06 | DC | D10 or any digital |
| #07 | CS | D9 or any digital |
| #08 | BLK | VCC |
If you find it useful and want to buy me a coffee or a beer: