SSD3306 I2C  

A Rust crate for SSD1306 LCD display over I²C

https://github.com/marvinrobot42/ssd1306-i2c.git

Documentation

This crate is a fork of James Waples's SH1106 crate modifed for SSD1306 use updated to use embedded-hal 1.0.

The SSD1306 LCD contains old fashion 8 bit parallel interface, a SPI and I2C interface. This crate only uses the I2C interface. Also, note that this driver includes support for several display sizes but only 128 x 64 is avialble for the SSD1306 (as far as I know).

Features

• updated to use embedded-hal version 1.0.x
• supports embedded-hal-bus 0.1.0 for I2C bus sharing
• uses embedded-graphics crate for graphics abstraction
• designed for embedded use (ESP32-C3, -C6 and -S3, etc.)
• supports both primary and secondary SSD1306 I2C addresses (default is primary = 0x3c)
• no_std embedded compatible

Notes

I wanted to add a LCD display to my home automation environmental sensor IoT creation but I could not find a crate for the SSD1306 that depends on embedded-hal 1.0. It needs to have several devices on one I2C bus and since my sensors are embedded-hal 1.0 based the SSD1306 crate needs to be also. So I did a quick job of migrating James's SH1106 crate from embedded-hal 0.2.x to 1.0, and modified it for the SSD1306 LCD. Why start with SH1106 instead of his SSD1306 create: because the SH1106 seemed more modern and does not depend on other embedded-hal 0.2 crates like display-interface-i2c (which is four years old now). Note that this ssd1306-i2c crate does not support SH1106 display because the display initialization is not compatible.

My Sparkfun SSD1306 LCD (LCD-23453) only supports I2C so I could not work with or test SPI.

Recent version history

• 0.1.4 More documentation
• 0.1.1 Some document typo fixes
• 0.1.0 Initial release

Usage

Add the dependencies to Cargo.toml.

[dependencies]
ssd1306-i2c version = "0.1"
embedded-graphics = "0.8.1" 
esp-idf-hal = "0.43.0"  # an embedded-hal for your platform

Simple Example

A more complete example is in the repository examples path. See James's SSH1106 crate repository examples folder for more examples: https://github.com/jamwaffles/sh1106/tree/master/examples.

use ssd1306_i2c::{prelude::*, Builder}; 

use embedded_graphics::{
    mono_font::{ascii::FONT_6X10, ascii::FONT_6X13_BOLD, MonoTextStyleBuilder},
    image::{Image, ImageRawLE},
    pixelcolor::BinaryColor,
    prelude::*,
    text::{Baseline, Text},
};

use log::info;

...


fn main() -> Result<()> {
  // Bind the log crate to the ESP Logging facilities
  esp_idf_svc::log::EspLogger::initialize_default();
  ...

  let peripherals = Peripherals::take().unwrap();
  let pins = peripherals.pins;
  let sda = pins.gpio0;
  let scl = pins.gpio1;
  let i2c = peripherals.i2c0;
  let config = I2cConfig::new().baudrate(400.kHz().into());
  let i2c_dev = I2cDriver::new(i2c, sda, scl, &config)?;

  let mut display: GraphicsMode<_> = Builder::new()
    .with_size(DisplaySize::Display128x64NoOffset)
    .with_i2c_addr(0x3d)  //or 0x3c
    .with_rotation(DisplayRotation::Rotate0)
    .connect_i2c(i2c_dev)
    .into();

  info!("calling display.init()");
  FreeRtos::delay_ms(100);
  display.init().unwrap();

  display.flush().unwrap();
 
  display.clear();

  //********* display some text

  // creating MonoTextStyleBuilder
  let text_style = MonoTextStyleBuilder::new()
    .font(&FONT_6X10)
    .text_color(BinaryColor::On)
    .build();

  let text_style_bold = MonoTextStyleBuilder::new()
    .font(&FONT_6X13_BOLD)
    .text_color(BinaryColor::On)
    .build();

  info!("displaying Hello world! on LCD");
  Text::with_baseline("Hello Rust World!....", Point::zero(), text_style_bold, Baseline::Top)
    .draw(&mut display)
    .unwrap();
  info!("displaying Hello Rust! on LCD");
  Text::with_baseline("SSD1306-I2C", Point::new(0, 19), text_style, Baseline::Top)
    .draw(&mut display)
    .unwrap();

  display.flush().unwrap();


  loop {
    info!("looping with delay so ESP32 watchdog does not restart controller");

    FreeRtos::delay_ms(10000);
  }

}
    

License

You are free to copy, modify, and distribute this application with attribution under the terms of either

• Apache License, Version 2.0 (LICENSE-Apache-2.0 or https://opensource.org/licenses/Apache-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.

This project is not affiliated with nor endorsed in any way by Sparkfun.