rp: add initial version

embassy-rp-examples/.cargo/config

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+[unstable]
+build-std = ["core"]
+build-std-features = ["panic_immediate_abort"]
+
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "probe-run-rp --chip RP2040"
+
+rustflags = [
+  # LLD (shipped with the Rust toolchain) is used as the default linker
+  "-C", "link-arg=--nmagic",
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
+
+  # if you run into problems with LLD switch to the GNU linker by commenting out
+  # this line
+  # "-C", "linker=arm-none-eabi-ld",
+
+  # if you need to link to pre-compiled C libraries provided by a C toolchain
+  # use GCC as the linker by commenting out both lines above and then
+  # uncommenting the three lines below
+  # "-C", "linker=arm-none-eabi-gcc",
+  # "-C", "link-arg=-Wl,-Tlink.x",
+  # "-C", "link-arg=-nostartfiles",
+
+  # Code-size optimizations.
+  "-Z", "trap-unreachable=no",
+]
+
+[build]
+target = "thumbv6m-none-eabi"        # Cortex-M0 and Cortex-M0+

embassy-rp-examples/Cargo.toml

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+[package]
+authors = ["Dario Nieuwenhuis <dirbaio@dirbaio.net>"]
+edition = "2018"
+name = "embassy-rp-examples"
+version = "0.1.0"
+
+[features]
+default = [
+    "defmt-default",
+]
+defmt-default = []
+defmt-trace = []
+defmt-debug = []
+defmt-info = []
+defmt-warn = []
+defmt-error = []
+
+
+[dependencies]
+embassy = { version = "0.1.0", path = "../embassy", features = ["defmt", "defmt-trace"] }
+embassy-rp = { version = "0.1.0", path = "../embassy-rp", features = ["defmt", "defmt-trace"] }
+rp2040-boot2 = { git = "https://github.com/rp-rs/rp2040-boot2-rs", branch="main" }
+rp2040-pac2 = { git = "https://github.com/Dirbaio/rp2040-pac", rev="254f4677937801155ca3cb17c7bb9d38eb62683e" }
+atomic-polyfill = { version = "0.1.1" }
+
+defmt = "0.2.0"
+defmt-rtt = "0.2.0"
+
+cortex-m = { version = "0.7.1", features = ["inline-asm"] }
+cortex-m-rt = "0.6.13"
+embedded-hal    = { version = "0.2.4" }
+panic-probe = "0.1.0"
+futures = { version = "0.3.8", default-features = false, features = ["async-await", "cfg-target-has-atomic", "unstable"] }

embassy-rp-examples/build.rs

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+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+}

embassy-rp-examples/memory.x

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+MEMORY {
+    BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+    FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+    RAM   : ORIGIN = 0x20000000, LENGTH = 256K
+}
+
+SECTIONS {
+    /* ### Boot loader */
+    .boot2 ORIGIN(BOOT2) :
+    {
+        KEEP(*(.boot2));
+    } > BOOT2
+} INSERT BEFORE .text;

embassy-rp-examples/src/main.rs

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+#![no_std]
+#![no_main]
+#![feature(asm)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+
+use core::sync::atomic::{AtomicUsize, Ordering};
+use defmt::{panic, *};
+use defmt_rtt as _;
+use embassy::executor::Spawner;
+use embassy::interrupt::InterruptExt;
+use embassy_rp::{dma, gpio, interrupt, uart, Peripherals};
+use embedded_hal::digital::v2::OutputPin;
+use panic_probe as _;
+use rp2040_pac2 as pac;
+
+#[link_section = ".boot2"]
+#[used]
+pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER;
+
+defmt::timestamp! {"{=u64}", {
+    static COUNT: AtomicUsize = AtomicUsize::new(0);
+    // NOTE(no-CAS) `timestamps` runs with interrupts disabled
+    let n = COUNT.load(Ordering::Relaxed);
+    COUNT.store(n + 1, Ordering::Relaxed);
+    n as u64
+}
+}
+
+#[embassy::main]
+async fn main(spanwer: Spawner) {
+    let p = unwrap!(Peripherals::take());
+
+    let mut config = uart::Config::default();
+    let mut uart = uart::Uart::new(p.UART0, p.PIN_0, p.PIN_1, p.PIN_2, p.PIN_3, config);
+    uart.send("Hello World!\r\n".as_bytes());
+
+    let mut led = gpio::Output::new(p.PIN_25, gpio::Level::Low);
+
+    let irq = interrupt::take!(DMA_IRQ_0);
+    unsafe {
+        //pac::DMA.inte0().write(|w| w.set_inte0(1 << 0));
+    }
+    irq.set_handler(dma_irq);
+    irq.unpend();
+    irq.enable();
+
+    let from: [u32; 4] = [1, 2, 3, 4];
+    let mut to: [u32; 4] = [9, 8, 7, 6];
+    info!("before dma: from = {:?}, to = {:?}", from, to);
+    cortex_m::asm::delay(4_000_000);
+    dma::Dma::copy(p.DMA_CH0, &from, &mut to);
+    cortex_m::asm::delay(4_000_000);
+    info!("after dma: from = {:?}, to = {:?}", from, to);
+
+    loop {
+        info!("led on!");
+        uart.send("ON!\r".as_bytes());
+        led.set_high().unwrap();
+        cortex_m::asm::delay(1_000_000);
+
+        info!("led off!");
+        uart.send("Off!\r".as_bytes());
+        led.set_low().unwrap();
+        cortex_m::asm::delay(4_000_000);
+    }
+}
+
+unsafe fn dma_irq(ctx: *mut ()) {
+    info!("DMA IRQ!");
+}