LCD I2C Driver for ESP32

This Rust crate provides a library for controlling various LCD displays (e.g., 16x2, 20x4) using the I2C protocol with the ESP32 microcontroller. It supports common functionalities such as cursor manipulation, display control, custom character creation, and more.

Features

• Multi-size LCD display support (16x2, 20x4, etc.).
• I2C communication with ESP32.
• Basic display control functions: clear, home, turn on/off, backlight control.
• Custom character creation (e.g., emojis, graphics).
• Cursor management: move cursor, enable/disable cursor blink.
• Print text, including handling long strings.
• Line management for smooth text flow across rows.

Requirements

• Rust toolchain
• ESP32 development environment
• anyhow for error handling
• esp-idf-sys for ESP32 system support

Installation

Add this crate as a dependency in your Cargo.toml:

[dependencies]
lcd_i2c_rs = "1.0.0"

Ensure that you have setup the esp-idf toolchain for Rust Development on ESP32.

Example

use lcd_i2c_rs::Lcd;
use esp_idf_hal::i2c::*;

let i2c = I2cDriver::new(/* params */).unwrap();
let mut lcd = Lcd::new(i2c, 16, 2); // Initialize for a 16x2 LCD display
lcd.init().unwrap();
lcd.print("Hello, World!").unwrap();
lcd.clear().unwrap();
lcd.set_cursor(0, 1).unwrap(); // Move to first column of the second row

let smiley = [
    0b00000,
    0b01010,
    0b00000,
    0b00000,
    0b10001,
    0b01110,
    0b00000,
];
lcd.create_custom_chars(0, &smiley).unwrap();
lcd.print("\0").unwrap(); // Print the custom character

lcd.cursor(true).unwrap(); // Enable the cursor
lcd.blink(true).unwrap();  // Enable blinking

lcd.print_long_str("This string is longer than one line and will wrap around.").unwrap();

API Documentation

Modules

Structs

• Lcd<'a>: Represents the LCD object, which handles all communication with the display.

Methods

• new(i2c, rows, cols): Create a new Lcd instance.

• init(): Initialize the display.

• display_on() / display_off(): Turn the display on or off.

• backlight_on() / backlight_off(): Control the backlight.

• clear(): Clear the display.

• cursor(on: bool): Enable or disable the cursor.

• blink(on: bool): Enable or disable cursor blinking.

• home(): Move the cursor to the home position.

• set_cursor(col, row): Set the cursor position.

• next_line(): Move the cursor to the next line.

• print(text): Print text to the display.

• print_str(text): Print strings to the display.

• print_long_str(text): Print long strings across multiple lines.

• create_custom_chars(location, charmap): Create custom characters.

Contributing

Contributions are welcome! Please open an issue or submit a pull request if you'd like to improve this library.

Guidelines

• Follow the Rust API design guidelines.
• Ensure compatibility with common LCD displays.
• Document all public functions and structs.

License

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)