esp-hal/examples/src/bin/embassy_spi.rs

//! Embassy SPI
//!
//! 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.
//!
//! The following wiring is assumed:
//! SCLK => GPIO0
//! MISO => GPIO2
//! MOSI => GPIO4
//! CS   => GPIO5

//% CHIPS: esp32 esp32c2 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3
//% FEATURES: embassy embassy-generic-timers esp-hal/unstable

#![no_std]
#![no_main]

use embassy_executor::Spawner;
use embassy_time::{Duration, Timer};
use esp_backtrace as _;
use esp_hal::{
    dma::{DmaRxBuf, DmaTxBuf},
    dma_buffers,
    spi::{
        master::{Config, Spi},
        Mode,
    },
    time::RateExtU32,
    timer::timg::TimerGroup,
};

#[esp_hal_embassy::main]
async fn main(_spawner: Spawner) {
    esp_println::println!("Init!");
    let peripherals = esp_hal::init(esp_hal::Config::default());

    let timg0 = TimerGroup::new(peripherals.TIMG0);
    esp_hal_embassy::init(timg0.timer0);

    let sclk = peripherals.GPIO0;
    let miso = peripherals.GPIO2;
    let mosi = peripherals.GPIO4;
    let cs = peripherals.GPIO5;

    cfg_if::cfg_if! {
        if #[cfg(any(feature = "esp32", feature = "esp32s2"))] {
            let dma_channel = peripherals.DMA_SPI2;
        } else {
            let dma_channel = peripherals.DMA_CH0;
        }
    }

    let (rx_buffer, rx_descriptors, tx_buffer, tx_descriptors) = dma_buffers!(32000);
    let dma_rx_buf = DmaRxBuf::new(rx_descriptors, rx_buffer).unwrap();
    let dma_tx_buf = DmaTxBuf::new(tx_descriptors, tx_buffer).unwrap();

    let mut spi = Spi::new(
        peripherals.SPI2,
        Config::default()
            .with_frequency(100.kHz())
            .with_mode(Mode::Mode0),
    )
    .unwrap()
    .with_sck(sclk)
    .with_mosi(mosi)
    .with_miso(miso)
    .with_cs(cs)
    .with_dma(dma_channel)
    .with_buffers(dma_rx_buf, dma_tx_buf)
    .into_async();

    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 received: {:?}", buffer);
        Timer::after(Duration::from_millis(5_000)).await;
    }
}