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Edwin Noorlander
2026-06-18 18:37:03 +02:00
commit 77b04071be
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.gitignore vendored Normal file
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/target

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Cargo.lock generated Normal file
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Cargo.toml Normal file
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[package]
name = "I2C4002"
version = "0.1.0"
edition = "2024"
[dependencies]
embedded-hal = "1.0"
linux-embedded-hal = { version = "0.4", default-features = false, features = ["i2c"] }
[profile.dev]
codegen-units = 256

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README.md Normal file
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incl/lcd.rs Normal file
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use embedded_hal::i2c::I2c;
use std::thread::sleep;
use std::time::Duration;
pub struct Lcd<I: I2c> {
i2c: I,
addr: u8,
backlight: bool,
}
impl<I: I2c> Lcd<I> {
const RS: u8 = 0b001;
const EN: u8 = 0b100;
const BL: u8 = 0b1000;
pub fn new(i2c: I, addr: u8) -> Result<Self, I::Error> {
let mut lcd = Self { i2c, addr, backlight: true };
lcd.init()?;
Ok(lcd)
}
fn write_nibble(&mut self, nibble: u8, rs: u8) -> Result<(), I::Error> {
let bl = if self.backlight { Self::BL } else { 0 };
let data = nibble | rs | bl;
self.i2c.write(self.addr, &[data | Self::EN])?;
sleep(Duration::from_micros(1));
self.i2c.write(self.addr, &[data & !Self::EN])?;
sleep(Duration::from_micros(50));
Ok(())
}
fn write_byte(&mut self, byte: u8, rs: u8) -> Result<(), I::Error> {
self.write_nibble(byte & 0xF0, rs)?;
self.write_nibble((byte & 0x0F) << 4, rs)?;
Ok(())
}
fn cmd(&mut self, c: u8) -> Result<(), I::Error> {
self.write_byte(c, 0)?;
if c <= 0x03 {
sleep(Duration::from_millis(2));
}
Ok(())
}
fn data(&mut self, d: u8) -> Result<(), I::Error> {
self.write_byte(d, Self::RS)
}
fn init(&mut self) -> Result<(), I::Error> {
sleep(Duration::from_millis(50));
for _ in 0..3 {
self.write_nibble(0x30, 0)?;
sleep(Duration::from_millis(5));
}
self.write_nibble(0x20, 0)?;
sleep(Duration::from_millis(1));
self.cmd(0x28)?;
self.cmd(0x0C)?;
self.cmd(0x06)?;
self.cmd(0x01)?;
sleep(Duration::from_millis(2));
Ok(())
}
pub fn clear(&mut self) -> Result<(), I::Error> {
self.cmd(0x01)?;
sleep(Duration::from_millis(2));
Ok(())
}
pub fn set_cursor(&mut self, col: u8, row: u8) -> Result<(), I::Error> {
let addr = match row {
0 => 0x00,
1 => 0x40,
2 => 0x14,
3 => 0x54,
_ => 0x00,
};
self.cmd(0x80 | (addr + col))
}
pub fn create_char(&mut self, location: u8, data: &[u8; 8]) -> Result<(), I::Error> {
self.cmd(0x40 | (location << 3))?;
for &b in data {
self.data(b)?;
}
self.set_cursor(0, 0)
}
pub fn print(&mut self, s: &str) -> Result<(), I::Error> {
for b in s.bytes() {
self.data(b)?;
}
Ok(())
}
}

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src/main.rs Normal file
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#[path = "../incl/lcd.rs"]
mod lcd;
use lcd::Lcd;
use std::thread::sleep;
use std::time::Duration;
fn main() -> Result<(), Box<dyn std::error::Error>> {
use linux_embedded_hal::I2cdev;
let i2c = I2cdev::new("/dev/i2c-1")?;
let mut lcd = Lcd::new(i2c, 0x27)?;
let heart = [ 0b00000,
0b01010,
0b11111,
0b11111,
0b11111,
0b01110,
0b00100,
0b00000
];
lcd.clear()?;
lcd.create_char(0, &heart)?;
lcd.set_cursor(0, 0)?;
lcd.print("\x00")?;
lcd.set_cursor(12, 0)?;
lcd.print("Hello from Rust!")?;
lcd.set_cursor(8, 1)?;
lcd.print("40x2 LCD via I2C at 0x27")?;
let mut nr: i32 = 0;
loop {
lcd.set_cursor(37, 0)?;
lcd.print(&format!("{:>3}", nr))?;
nr = (nr + 1) % 256;
sleep(Duration::from_millis(125));
}
}