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

https://youtu.be/GciLKcWQZK4

YouTube playlist with all videos related to ST7789:

https://www.youtube.com/playlist?list=PLxb1losWErZ7thUyB05phRR3DoiYN_kcD

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

• 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)

• 240x240 1.3" IPS (without CS pin)

Circuit	Front	Back

• 240x240 1.54" IPS (with CS pin)

Circuit	Front	Back

• 240x280 1.69" IPS

Circuit	Front	Back

• 170x320 1.9" IPS

Circuit	Front	Back

• 240x320 2.0" IPS

Circuit	Front	Back

• 240x320 2.8" TFT? - use inverseDisplay(1)

Circuit	Front	Back

• 76x284 2.25" TFT? - use inverseDisplay(1)

Circuit	Front	Back

Without CS (1.3" only) - use CS_ALWAYS_LOW

With CS - don't use CS_ALWAYS_LOW

If you find it useful and want to buy me a coffee or a beer:

https://buycoffee.to/cbm80

https://www.paypal.me/cbm80amiga