Overview and Warning:

This is a modified version of the official PJRC ILI9341_t3 library (https://github.com/PaulStoffregen/ILI9341_t3) to work with ILI9488 displays. And it is always a Work In Progress.

Currently the library has been verified to work with Teensy 3.2 (no framebuffer), T3.5, T3.6, T4.0, T4.1 and the Teensy Micromod board. Teensy LC is not supported at this time.

This library borrows some concepts and functionality from another ILI9341 library, https://github.com/KurtE/ILI9341_t3n. It also incorporates functionality from the TFT_ILI9341_ESP, https://github.com/Bodmer/TFT_ILI9341_ESP, for additional functions:

    int16_t  drawNumber(long long_num,int poX, int poY);
    int16_t  drawFloat(float floatNumber,int decimal,int poX, int poY);   
    int16_t drawString(const String& string, int poX, int poY);
    int16_t drawString(char string[], int16_t len, int poX, int poY);
    void setTextDatum(uint8_t datum);

In addition, scrolling text has been added using appropriate function from, https://github.com/vitormhenrique/ILI9341_t3:

    void enableScroll(void);
    void resetScrollBackgroundColor(uint16_t color);
    void setScrollTextArea(int16_t x, int16_t y, int16_t w, int16_t h);
    void setScrollBackgroundColor(uint16_t color);
    void scrollTextArea(uint8_t scrollSize);
    void resetScrollBackgroundColor(uint16_t color);

NOTE: Scroll text area does not appear to work correctly with the ILI9488 displays that are readily available from EBAY or Amazon (the SPI only red boards with the yellow connector) without using a FrameBuffer. The ScrollTest_Framebuffer example shows how to use scrollTextBuffer with a Framebuffer.

This library was created to allow extended use on the ILI9488 larger display and supports T3.5, t3.6 and beyond.

For further development status see: https://forum.pjrc.com/threads/55735-ILI9488_t3-Support-for-the-ILI9488-on-T3-x-and-beyond

Frame Buffer

The teensy 3.6 and now 3.5 have a lot more memory than previous Teensy processors, so on these boards, I borrowed some ideas from the ILI9341_t3DMA library and added code to be able to use a logical Frame Buffer. To enable this I added a couple of API's

    uint8_t useFrameBuffer(boolean b) - if b non-zero it will allocate memory and start using
    void	freeFrameBuffer(void) - Will free up the memory that was used.
    void	updateScreen(void); - Will update the screen with all of your updates...
	void	setFrameBuffer(uint16_t *frame_buffer); - Now have the ability allocate the frame buffer and pass it in, to avoid use of malloc

Asynchronous Update support (Frame buffer)

The code now has support to use DMA for Asynchronous updates of the screen. You can choose to do the updates once or in continuous mode. Note: I mainly use the oneshot as I prefer more control on when the screen updates which helps to minimize things like flashing and tearing. Some of the New methods for this include:

	bool	updateScreenAsync(bool update_cont = false); - Starts an update either one shot or continuous
	void	waitUpdateAsyncComplete(void);  - Wait for any active update to complete
	void	endUpdateAsync();			 - Turn of the continuous mode.
	boolean	asyncUpdateActive(void)      - Lets you know if an async operation is still active

Additional APIs

In addition, this library now has some of the API's and functionality that has been requested in a pull request. In particular it now supports, the ability to set a clipping rectangle as well as setting an origin that is used with the drawing primitives. These new API's include:

	void setOrigin(int16_t x = 0, int16_t y = 0); 
	void getOrigin(int16_t* x, int16_t* y);
	void setClipRect(int16_t x1, int16_t y1, int16_t w, int16_t h); 
	void setClipRect();

Adafruit library info

But as this code is based of of their work, their original information is included below and uses fonts and the Adafruit GFX library:

---

This is a library for the Adafruit ILI9341 display products

This library works with the Adafruit 2.8" Touch Shield V2 (SPI) ----> http://www.adafruit.com/products/1651

Check out the links above for our tutorials and wiring diagrams. These displays use SPI to communicate, 4 or 5 pins are required to interface (RST is optional).

Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!

Written by Limor Fried/Ladyada for Adafruit Industries. MIT license, all text above must be included in any redistribution

To download. click the DOWNLOADS button in the top right corner, rename the uncompressed folder Adafruit_ILI9341. Check that the Adafruit_ILI9341 folder contains Adafruit_ILI9341.cpp and Adafruit_ILI9341.

Place the Adafruit_ILI9341 library folder your arduinosketchfolder/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE

Also requires the Adafruit_GFX library for Arduino.

Future Updates

Again WIP