esp-hal/esp32s2-hal/examples/embassy_spi.rs

//! Embassy SPI
//!
//! Folowing pins are used:
//! SCLK    GPIO36
//! MISO    GPIO37
//! MOSI    GPIO35
//! CS      GPIO34
//!
//! Depending on your target and the board you are using you have to change the
//! pins.
//!
//! Connect MISO and MOSI pins to see the outgoing data is read as incoming
//! data.
//!
//! This is an example of running the embassy executor with SPI.

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

use embassy_executor::Spawner;
use embassy_time::{Duration, Timer};
use esp32s2_hal::{
    clock::ClockControl,
    dma::DmaPriority,
    embassy::{self},
    pdma::*,
    peripherals::Peripherals,
    prelude::*,
    spi::{Spi, SpiMode},
    IO,
};
use esp_backtrace as _;

#[main]
async fn main(_spawner: Spawner) -> ! {
    esp_println::println!("Init!");
    let peripherals = Peripherals::take();
    let system = peripherals.SYSTEM.split();
    let clocks = ClockControl::boot_defaults(system.clock_control).freeze();

    #[cfg(feature = "embassy-time-timg0")]
    {
        let timer_group0 = esp32s2_hal::timer::TimerGroup::new(peripherals.TIMG0, &clocks);
        embassy::init(&clocks, timer_group0.timer0);
    }

    esp32s2_hal::interrupt::enable(
        esp32s2_hal::peripherals::Interrupt::SPI2_DMA,
        esp32s2_hal::interrupt::Priority::Priority1,
    )
    .unwrap();

    let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
    let sclk = io.pins.gpio36;
    let miso = io.pins.gpio37;
    let mosi = io.pins.gpio35;
    let cs = io.pins.gpio34;

    let dma = Dma::new(system.dma);
    let dma_channel = dma.spi2channel;

    let mut descriptors = [0u32; 8 * 3];
    let mut rx_descriptors = [0u32; 8 * 3];

    let mut spi = Spi::new(
        peripherals.SPI2,
        sclk,
        mosi,
        miso,
        cs,
        100u32.kHz(),
        SpiMode::Mode0,
        &clocks,
    )
    .with_dma(dma_channel.configure(
        false,
        &mut descriptors,
        &mut rx_descriptors,
        DmaPriority::Priority0,
    ));

    let send_buffer = [0, 1, 2, 3, 4, 5, 6, 7];
    loop {
        let mut buffer = [0; 8];
        esp_println::println!("Sending bytes");
        embedded_hal_async::spi::SpiBus::transfer(&mut spi, &mut buffer, &send_buffer)
            .await
            .unwrap();
        esp_println::println!("Bytes recieved: {:?}", buffer);
        Timer::after(Duration::from_millis(5_000)).await;
    }
}