hd44780-embedded-hal

Driver library for HD44780-LCD built ontop of [embedded-hal] or [embedded-hal-async]. If you want to make use of the [embedded-hal-async] traits, set the [async] feature. This crate can then be used with crates that implement there traits.

• on crates.io
• on github

Quick Example

// setup microcontroller environment
// ...

let i2c = ...;   // impl of embedded_hal_async::i2c::I2c       (or embedded_hal::i2c::I2c)
let delay = ...; // impl of embedded_hal_async::delay::DelayNs (or embedded_hal::delay::DelayNs)

let mut lcd = Hd44780::new(
    Pcf8574Interface::new(
        i2c,
        0x20,  // choose your address
        delay,
        Pcf8574EncoderDefault::new()
    ),
    DisplayTypeFont5x8::new(2,16,FnsetLines::Two)
);

lcd.init().await;

lcd.print_str("Hello World").await;

lcd.position(1,0).await; // set cursor to 2nd row

lcd_write!(
  lcd, 
  "{}={}", 
  hd44780_embedded_hal::characters::NonASCIIA00::GreekSmallPi, 
  3.1415
).await;

Interfaces

This library implements the following interfaces to connect HD44780 with your microcontroller:

• PCF8574
  • 8-bit portexpander through I2C
• GPIO 4-bit data length
  • requires 8 GPIO pins
• GPIO 8-bit data length
  • requires 12 GPIO pins

ToDo's

• There are some characters not defined in [characters.rs].
• Testing of GPIO Interfaces

Version History

• < 0.1.3 First versions
• 0.1.4 made crate more generic (create_char), added ping functionality