semi-working snake game

user-apps/snake/Cargo.toml

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+[package]
+name = "snake"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+abi = { path = "../../abi" }
+embedded-graphics = "0.8.1"
+embedded-snake = { path = "../../../embedded-snake-rs" }
+rand = { version = "0.9.0", default-features = false }

user-apps/snake/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());
+
+    println!("cargo:rerun-if-changed=memory.x");
+    println!("cargo:rustc-link-arg-bins=-Tmemory.x");
+}

user-apps/snake/src/main.rs

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+#![no_std]
+#![no_main]
+
+extern crate alloc;
+use abi::{
+    KeyCode, Rng,
+    display::{Display, SCREEN_HEIGHT, SCREEN_WIDTH},
+    get_key, lock_display, print, sleep,
+};
+use alloc::format;
+use core::panic::PanicInfo;
+use embedded_graphics::{pixelcolor::Rgb565, prelude::RgbColor};
+use embedded_snake::{Direction, SnakeGame};
+
+#[panic_handler]
+fn panic(info: &PanicInfo) -> ! {
+    print(&format!(
+        "user panic: {} @ {:?}",
+        info.message(),
+        info.location(),
+    ));
+    loop {}
+}
+
+#[unsafe(no_mangle)]
+pub extern "Rust" fn _start() {
+    main()
+}
+
+const CELL_SIZE: usize = 8;
+
+pub fn main() {
+    print("Starting Snake app");
+    let mut display = Display;
+
+    let mut game = SnakeGame::<100, Rgb565, Rng>::new(
+        SCREEN_WIDTH as u16,
+        SCREEN_HEIGHT as u16,
+        CELL_SIZE as u16,
+        CELL_SIZE as u16,
+        Rng,
+        Rgb565::BLACK,
+        Rgb565::GREEN,
+        Rgb565::RED,
+        50,
+    );
+
+    loop {
+        if let Some(event) = get_key() {
+            let direction = match event.key {
+                KeyCode::Up => Direction::Up,
+                KeyCode::Down => Direction::Down,
+                KeyCode::Right => Direction::Right,
+                KeyCode::Left => Direction::Left,
+                KeyCode::Esc => return,
+                _ => Direction::None,
+            };
+            game.set_direction(direction);
+        }
+
+        // ensure all draws show up at once
+        lock_display(true);
+        game.pre_draw(&mut display);
+        game.draw(&mut display);
+        lock_display(false);
+
+        sleep(15);
+    }
+}