TFT_eSPI_Scroll

TFT_eSPI_Scroll library adds text scroll functionality to the existing TFT_eSPI library. This library by default uses 1-bit color-depth which makes it perform very fast & flickerless with very minimum ram usages. The color-depth can be changed accordingly to match required performances. This library supports all the processors that TFT_eSPI library supports. Available in PlatformIO Registry and Arduino Library Manager.

Installation

Platform IO:

1. Open platformio.ini, a project configuration file located in the root of PlatformIO project.
2. Add the following line to the lib_deps option of [env:] section:

xunicatt/TFT_eSPI_Scroll@^1.0.1

3. Build a project, PlatformIO will automatically install dependencies.

Arduino:

1. Open the Arduino IDE.
2. With the editor open, let's take a look at the left column. Here, we can see a couple of icons. Let's click the on the "library" icon.
3. A list will now appear of all available libraries, search for TFT_eSPI_Scroll.
4. Select a version and Click Install.

Include

TFT_eSPI_Scroll library provides the following header files that can be included in your project.

#include <TFT_eSPI_Scroll.h>

Usage

Object Creation:-

#include <TFT_eSPI.h>
#include <TFT_eSPI_Scroll.h>

TFT_eSPI tft;
TFT_eSPI_Scroll scroll;

Initialization:-

Warning

Note it is important to initialize the "TFT_eSPI" library before using "TFT_eSPI_Scroll".

Using this method the "TFT_eSPI_Scroll" library initializes in 1-bit color-depth mode. Only black and white color is available in this color-depth. Though 1-bit color-depth is limited to B/W colors, it is not only fast but also memory efficient and renders without any flickering or glitches.

int textFont = 4;

void setup(){
    tft.init();
    if(scroll.init(&tft, textFont) != NO_ERROR){
        // memory allocation failed
    }

    // rest of the code
}

To set other color-depths, intialize the library with:

// previous codes

int colorDepth = 4; // 4-bit color depth

if(scroll.init(&tft, textFont, colorDepth) != NO_ERROR){
    // memory allocation failed
}

// rest of the code

Writing to display:-

int count = 0;

void loop(){
    scroll.write("Count: " + String(count++));
}

Changing the background & foreground color:-

Warning

Note in order to apply proper colors (excluding 1-Bit default), proper color-depth must be selected during initialization.

// bg & fg {8-bit}
scroll.setColor(TFT_BLUE, TFT_YELLOW);

// bg & fg {4-bit} COLOR_<name>_4B
scroll.setColor(COLOR_BLUE_4B, COLOR_YELLOW_4B);

// bg & fg {1-bit} COLOR_<name>_1B
scroll.setColor(COLOR_WHITE_1B, COLOR_BLACK_1B);

Reseting the library while freeing up spaces:-

scroll.reset();

Version

1.0.5