Hello world

firmware/.cargo/config.toml

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+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "elf2uf2-rs -d"
+
+[build]
+target = "thumbv6m-none-eabi"
+
+[env]
+DEFMT_LOG = "info"

firmware/.gitignore

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+# Cargo build artifacts
+/target/
+**/.idea

firmware/Cargo.toml

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+[package]
+edition = "2024"
+name = "led-mask"
+version = "0.1.0"
+authors = ["Adam Gausmann <adam@gaussian.dev>"]
+resolver = "2"
+
+[[bin]]
+name = "led-mask"
+test = false
+bench = false
+
+[dependencies]
+defmt = "1.0"
+defmt-rtt = "1.1"
+panic-probe = { version = "1.0", features = ["print-defmt"] }
+
+embedded-hal = "1.0.0"
+embedded-hal-async = "1.0.0"
+embedded-io = "0.6.1"
+embedded-io-async = "0.6.1"
+embedded-storage = "0.3.1"
+
+cortex-m-rt = "0.7.3"
+
+embassy-executor = { version = "0.9", features = [
+    "arch-cortex-m",
+    "executor-thread",
+    "defmt",
+    "executor-interrupt",
+] }
+embassy-sync = "0.7"
+embassy-time = { version = "0.5", features = [
+    "defmt",
+    "defmt-timestamp-uptime",
+] }
+cortex-m = { version = "0.7.7" }
+embassy-rp = { version = "0.8", features = ["defmt", "unstable-pac", "time-driver", "critical-section-impl", "rp2040", "boot2-w25q080"] }
+embedded-graphics = "0.8"
+mipidsi = "0.9.0"
+embedded-hal-bus = "0.3.0"
+
+[profile.release]
+debug = 2
+lto = true
+opt-level = 'z'
+
+[profile.dev]
+debug = 2
+lto = true
+opt-level = "z"

firmware/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");
+
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+println!("cargo:rustc-link-arg-bins=-Tlink-rp.x");
+}

firmware/memory.x

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+MEMORY
+{
+BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+RAM   : ORIGIN = 0x20000000, LENGTH = 264K
+}
+

firmware/rust-toolchain.toml

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+# Before upgrading check that everything is available on all tier1 targets here:
+# https://rust-lang.github.io/rustup-components-history
+[toolchain]
+channel = "stable"
+components = [ "rustfmt" ]
+targets = [
+    "thumbv6m-none-eabi",
+    "thumbv7em-none-eabihf",
+    "thumbv8m.main-none-eabihf",
+    "riscv32imac-unknown-none-elf",
+]

firmware/src/main.rs

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+#![no_std]
+#![no_main]
+
+use embassy_executor::Spawner;
+use embassy_rp::gpio::{Input, Level, Output, Pull};
+use embassy_rp::pwm::{self, Pwm};
+use embassy_time::{Delay, Timer};
+use embedded_hal_bus::spi::ExclusiveDevice;
+use mipidsi::interface::SpiInterface;
+use mipidsi::models::ST7789;
+use mipidsi::options::Orientation;
+use {defmt_rtt as _, panic_probe as _};
+
+use embassy_rp::spi;
+use embassy_rp::spi::{Blocking, Spi};
+use embedded_graphics::image::{Image, ImageRawLE};
+use embedded_graphics::mono_font::MonoTextStyle;
+use embedded_graphics::mono_font::ascii::FONT_10X20;
+use embedded_graphics::pixelcolor::Rgb565;
+use embedded_graphics::prelude::*;
+use embedded_graphics::text::Text;
+
+use {defmt_rtt as _, panic_probe as _};
+
+const DISPLAY_FREQ: u32 = 64_000_000;
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) -> ! {
+    let p = embassy_rp::init(Default::default());
+
+    // display SPI
+
+    let mut display_buffer = [0u8; 512];
+
+    let mut display = {
+        let mut config = spi::Config::default();
+        config.frequency = DISPLAY_FREQ;
+        config.phase = spi::Phase::CaptureOnSecondTransition;
+        config.polarity = spi::Polarity::IdleHigh;
+        let clk = p.PIN_18;
+        let mosi = p.PIN_19;
+        let spi_bus: Spi<'_, _, Blocking> = Spi::new_blocking_txonly(p.SPI0, clk, mosi, config);
+        let cs = Output::new(p.PIN_17, Level::High);
+        let spi_dev = ExclusiveDevice::new(spi_bus, cs, Delay).expect("set cs high");
+
+        let dc = Output::new(p.PIN_16, Level::Low);
+
+        let di = SpiInterface::new(spi_dev, dc, &mut display_buffer);
+        mipidsi::Builder::new(ST7789, di)
+            .color_order(mipidsi::options::ColorOrder::Rgb)
+            .invert_colors(mipidsi::options::ColorInversion::Inverted)
+            .display_size(135, 240)
+            .display_offset(52, 40)
+            .orientation(Orientation::new().rotate(mipidsi::options::Rotation::Deg90))
+            .init(&mut Delay)
+            .expect("display init")
+    };
+    let _display_backlight = Output::new(p.PIN_20, Level::High);
+    display.clear(Rgb565::BLACK).unwrap();
+
+    let raw_image_data = ImageRawLE::new(include_bytes!("assets/ferris.raw"), 86);
+    let ferris = Image::new(&raw_image_data, Point::new(0, 0));
+    ferris.draw(&mut display).unwrap();
+
+    let style = MonoTextStyle::new(&FONT_10X20, Rgb565::GREEN);
+    Text::new(
+        "Hello embedded_graphics \n + embassy + RP2040!",
+        Point::new(0, 68),
+        style,
+    )
+    .draw(&mut display)
+    .unwrap();
+
+    // setup RGB LED
+    let mut rg_config = pwm::Config::default();
+    rg_config.compare_a = 0xffff;
+    rg_config.compare_b = 0xffff;
+    let mut b_config = pwm::Config::default();
+    b_config.compare_a = 0xffff;
+    let mut rg_pwm = Pwm::new_output_ab(p.PWM_SLICE3, p.PIN_6, p.PIN_7, rg_config.clone());
+    let mut b_pwm = Pwm::new_output_a(p.PWM_SLICE4, p.PIN_8, b_config.clone());
+
+    let mut set_led = |r: u8, g: u8, b: u8| {
+        rg_config.compare_a = 0x101 * (255 - r as u16);
+        rg_config.compare_b = 0x101 * (255 - g as u16);
+        b_config.compare_a = 0x101 * (255 - b as u16);
+        rg_pwm.set_config(&rg_config);
+        b_pwm.set_config(&b_config);
+    };
+
+    // Setup buzzer
+    let mut buzzer_config = pwm::Config::default();
+    buzzer_config.compare_b = 0x4000;
+    buzzer_config.enable = false;
+    let _buzzer_pwm = Pwm::new_output_b(p.PWM_SLICE5, p.PIN_11, buzzer_config.clone());
+
+    // Setup buttons
+    let _btn_a = Input::new(p.PIN_12, Pull::Up);
+    let _btn_b = Input::new(p.PIN_13, Pull::Up);
+    let _btn_x = Input::new(p.PIN_14, Pull::Up);
+    let _btn_y = Input::new(p.PIN_15, Pull::Up);
+
+    loop {
+        Timer::after_millis(100).await;
+        set_led(0, 0, 63);
+    }
+}