Crate ht16k33_async

source ·

Expand description

§HT16K33

ht16k33-async is an async driver for the Holtek HT16K33 “RAM Mapping 16*8 LED Controller Driver with keyscan”.

Currently, only the 28-pin SOP package type is supported.

§Features

Uses the embedded-hal-async hardware abstraction.
Supports no_std for embedded devices.
Supports all 20/24/28-pin SOP package types.
Displays all 128 LEDs.
Support dimming.
Reads keyscan.
Manages interrupts.

§Support

For questions, issues, feature requests, and other changes, please file an issue in the gitlab project.

§Usage

Using the embassy crate which implements the embedded-hal-async traits, on a Raspberry Pi Pico.

#![no_std]
#![no_main]

use embassy_executor::Spawner;
use panic_halt as _;
use embassy_rp::{i2c, bind_interrupts};
use embassy_rp::peripherals::I2C1;

bind_interrupts!(struct Irqs {
    I2C1_IRQ => i2c::InterruptHandler<I2C1>;
});

#[embassy_executor::main]
async fn main(spawner: Spawner) {
    let p = embassy_rp::init(Default::default());

    let scl = p.PIN_3;
    let sda = p.PIN_2;
    let i2c = i2c::I2c::new_async(p.I2C1, scl, sda, Irqs, i2c::Config::default());
    let mut driver = HT16K33::new(i2c, 0x3F);

    driver.setup().await.unwrap();

    let mut buffer = [0u8; 6];

    loop {
        // Copy keypresses to LEDs
        driver.read_keys(&mut buffer).await.unwrap();
        driver.write_whole_display(&buffer).await.unwrap();
    }
}

Structs§