keyboard.rs

#![no_std]
#![no_main]

use alloc::string::String;
use esp_hal::clock::CpuClock;
use esp_hal::delay::Delay;
use esp_hal::gpio::Level::High;
use esp_hal::gpio::{Output, OutputConfig};
use esp_hal::i2c::master::{BusTimeout, Config, I2c};
use esp_hal::main;
use esp_hal::time::Rate;
use log::info;

#[panic_handler]
fn panic(_: &core::panic::PanicInfo) -> ! {
    loop {}
}

extern crate alloc;

pub const LILYGO_KB_I2C_ADDRESS: u8 = 0x55;

// This creates a default app-descriptor required by the esp-idf bootloader.
// For more information see: <https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/system/app_image_format.html#application-description>
esp_bootloader_esp_idf::esp_app_desc!();


#[main]
fn main() -> ! {

    esp_println::logger::init_logger_from_env();
    let config = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
    let peripherals = esp_hal::init(config);

    esp_alloc::heap_allocator!(size: 72 * 1024);

    let delay = Delay::new();

    // have to turn on the board and wait 500ms before using the keyboard
    let mut board_power = Output::new(peripherals.GPIO10, High, OutputConfig::default());
    board_power.set_high();
    info!("board is powering up");
    delay.delay_millis(1000);

    let mut i2c = I2c::new(
        peripherals.I2C0,
        Config::default()
            .with_frequency(Rate::from_khz(100))
            .with_timeout(BusTimeout::Disabled),
    )
    .unwrap()
    .with_sda(peripherals.GPIO18)
    .with_scl(peripherals.GPIO8);

    info!("looping over the keyboard");
    loop {
        let mut data = [0u8; 1];
        let kb_res = i2c.read(LILYGO_KB_I2C_ADDRESS, &mut data);
        match kb_res {
            Ok(_) => {
                if data[0] != 0x00 {
                    info!("kb_res = {:?}", String::from_utf8_lossy(&data));
                    delay.delay_millis(100);
                }
            }
            Err(e) => {
                info!("kb_res = {e}");
                delay.delay_millis(1000);
            }
        }
    }
}