mirror of
https://github.com/esp-rs/esp-hal.git
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17884743bd
* Add macro to create DMA buffers and descriptors * Remove WDT disabling from remaining examples * CHANGELOG.md entry * Remove redundant `unsafe` * Easier way to make RX and TX same sized
95 lines
2.5 KiB
Rust
95 lines
2.5 KiB
Rust
//! Embassy SPI
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//!
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//! Folowing pins are used:
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//! SCLK GPIO36
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//! MISO GPIO37
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//! MOSI GPIO35
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//! CS GPIO34
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//!
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//! Depending on your target and the board you are using you have to change the
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//! pins.
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//!
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//! Connect MISO and MOSI pins to see the outgoing data is read as incoming
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//! data.
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//!
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//! This is an example of running the embassy executor with SPI.
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#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use embassy_executor::Spawner;
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use embassy_time::{Duration, Timer};
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use esp32s2_hal::{
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clock::ClockControl,
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dma::DmaPriority,
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dma_descriptors,
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embassy::{self},
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pdma::*,
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peripherals::Peripherals,
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prelude::*,
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spi::{
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master::{prelude::*, Spi},
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SpiMode,
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},
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IO,
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};
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use esp_backtrace as _;
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#[main]
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async fn main(_spawner: Spawner) {
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esp_println::println!("Init!");
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let peripherals = Peripherals::take();
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let system = peripherals.SYSTEM.split();
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let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
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#[cfg(feature = "embassy-time-systick")]
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embassy::init(
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&clocks,
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esp32s2_hal::systimer::SystemTimer::new(peripherals.SYSTIMER),
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);
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#[cfg(feature = "embassy-time-timg0")]
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{
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let timer_group0 = esp32s2_hal::timer::TimerGroup::new(peripherals.TIMG0, &clocks);
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embassy::init(&clocks, timer_group0.timer0);
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}
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esp32s2_hal::interrupt::enable(
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esp32s2_hal::peripherals::Interrupt::SPI2_DMA,
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esp32s2_hal::interrupt::Priority::Priority1,
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)
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.unwrap();
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let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
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let sclk = io.pins.gpio36;
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let miso = io.pins.gpio37;
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let mosi = io.pins.gpio35;
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let cs = io.pins.gpio34;
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let dma = Dma::new(system.dma);
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let dma_channel = dma.spi2channel;
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let (mut descriptors, mut rx_descriptors) = dma_descriptors!(32000);
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let mut spi = Spi::new(peripherals.SPI2, 100u32.kHz(), SpiMode::Mode0, &clocks)
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.with_pins(Some(sclk), Some(mosi), Some(miso), Some(cs))
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.with_dma(dma_channel.configure(
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false,
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&mut descriptors,
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&mut rx_descriptors,
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DmaPriority::Priority0,
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));
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let send_buffer = [0, 1, 2, 3, 4, 5, 6, 7];
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loop {
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let mut buffer = [0; 8];
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esp_println::println!("Sending bytes");
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embedded_hal_async::spi::SpiBus::transfer(&mut spi, &mut buffer, &send_buffer)
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.await
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.unwrap();
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esp_println::println!("Bytes recieved: {:?}", buffer);
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Timer::after(Duration::from_millis(5_000)).await;
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}
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}
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