mean00 / simplerILI9341

simple and portable ILI9341 library (and similar chips)

simplerILI9341

This is a simple & portable ILI9341 library. It comes in two flavors : C++ and Rust
It only deals with the core drawing and font display, taking advantage of the specificities of that controller such as DMA repeat etc...

The library supports modified "Truetype"/adafruit fonts ( 1 bit per pixel, 2 bit per pixel and font compression are supported).
The library prints strings "in place", so you can avoid flickering effects (no need to clear-then-print, just print).

It also supports heatshrink-byte compressed one bpp bitmap (i.e. 2 colors image).

It supports ILI3941 and partially ST7789/ST7735

C++

You must derive the class and implements the hw dependant part. As a result, it is highly portable, both in terms of hw (SPI, parallel,...) and in terms of MCU.

In your derived class , you have to provide the following methods :

virtual void sendByte(int byte)=0; // 8 bytes
virtual void sendWord(int byte)=0; // 16 bytes
virtual void sendBytes(int nb, const uint8_t *data)=0; // 8 bits
virtual void sendWords(int nb, const uint16_t *data)=0; // 16 bits
virtual void updateHwRotation()=0;
virtual void floodWords(int nb, const uint16_t data)=0; // 16 bits            
virtual void setAddress(int x, int y, int w, int h)=0;
virtual void dataEnd()=0;
virtual void dataBegin()=0;
virtual void pushColors(int len, uint16_t *data)=0;

Rust

You must provide an "access" crate to give access to your device. That part is platform / hw dependant. The core is platform agnostic. There are 2 samples provided :

• lnSPI : ILI9341 connected to SPI bus, using the lnArduino framework
• SIM : Basic port to run the driver on your PC

The access crate is very small, basically 4 or 5 functions to provide. NB : There is also a "simulator" in the sim folder. It enables running your stuff on a PC to test it before putting it on the final system.