embassy/examples/stm32l4/src/bin/i2c_dma.rs

#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]

use defmt::*;
use embassy_executor::executor::Spawner;
use embassy_stm32::i2c::I2c;
use embassy_stm32::time::Hertz;
use embassy_stm32::{interrupt, Peripherals};
use {defmt_rtt as _, panic_probe as _};

const ADDRESS: u8 = 0x5F;
const WHOAMI: u8 = 0x0F;

#[embassy_executor::main]
async fn main(_spawner: Spawner, p: Peripherals) -> ! {
    let irq = interrupt::take!(I2C2_EV);
    let mut i2c = I2c::new(p.I2C2, p.PB10, p.PB11, irq, p.DMA1_CH4, p.DMA1_CH5, Hertz(100_000));

    let mut data = [0u8; 1];
    unwrap!(i2c.write_read(ADDRESS, &[WHOAMI], &mut data).await);
    info!("Whoami: {}", data[0]);
}