Add rp-pico example

examples/rp2040-hal-blocking/.cargo/config.toml

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+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "probe-rs run --chip RP2040 --protocol swd"
+# runner = "elf2uf2-rs -d"
+
+rustflags = [
+  "-C", "link-arg=--nmagic",
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
+]
+
+[build]
+target = "thumbv6m-none-eabi"
+
+[env]
+DEFMT_LOG = "debug"

examples/rp2040-hal-blocking/.gitignore

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+**/*.rs.bk
+.#*
+.gdb_history
+Cargo.lock
+target/
+
+# editor files
+.vscode/*
+!.vscode/*.md
+!.vscode/*.svd
+!.vscode/launch.json
+!.vscode/tasks.json
+!.vscode/extensions.json
+!.vscode/settings.json

examples/rp2040-hal-blocking/.vscode/settings.json

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+{
+    "rust-analyzer.cargo.target": "thumbv6m-none-eabi",
+    "rust-analyzer.checkOnSave.allTargets": false,
+    "editor.formatOnSave": true,
+    "[toml]": {
+        "editor.formatOnSave": false,
+    }
+}

examples/rp2040-hal-blocking/Cargo.toml

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+[package]
+authors = ["9names"]
+edition = "2018"
+readme = "README.md"
+name = "wii-ext_blocking_demo"
+version = "0.1.0"
+resolver = "2"
+publish = false
+
+[dependencies]
+cortex-m = "0.7.3"
+cortex-m-rt = "0.7.0"
+embedded-hal = { version = "0.2.7", features = ["unproven"] }
+embedded-time = "0.12.0"
+defmt = "0.3.0"
+defmt-rtt = "0.4.0"
+panic-probe = { version = "0.3.0", features = ["print-defmt"] }
+fugit = "0.3.6"
+usb-device = "0.2"
+usbd-human-interface-device = "0.4.5"
+wii-ext = { version = "0.3.0", features = ["defmt_print",], path = "../../wii-ext" }
+rp-pico = "0.8.0"
+
+[profile.release]
+debug = 2

examples/rp2040-hal-blocking/README.md

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+# Example project for wii-ext using Raspberry Pi Pico
+
+Just a simple example of how to use wii-ext-rs.  
+Grab a pico, wire up a classic controller or nunchuk and test it out!

examples/rp2040-hal-blocking/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");
+}

examples/rp2040-hal-blocking/memory.x

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+MEMORY {
+    BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+    FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+    RAM   : ORIGIN = 0x20000000, LENGTH = 256K
+}
+
+EXTERN(BOOT2_FIRMWARE)
+
+SECTIONS {
+    /* ### Boot loader */
+    .boot2 ORIGIN(BOOT2) :
+    {
+        KEEP(*(.boot2));
+    } > BOOT2
+} INSERT BEFORE .text;

examples/rp2040-hal-blocking/src/main.rs

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+//! Interact with a Wii extension controller via the wii-ext crate on a Pico board
+//!
+//! It will enumerate as a USB joystick, which you can use to control a game
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use defmt_rtt as _;
+use panic_probe as _;
+
+use rp_pico as bsp;
+use bsp::hal::{
+    self,
+    entry,
+    clocks::{init_clocks_and_plls, Clock},
+    gpio::FunctionI2C,
+    pac,
+    sio::Sio,
+    watchdog::Watchdog,
+};
+use fugit::RateExtU32;
+use wii_ext::{classic_sync::Classic, core::classic::ClassicReadingCalibrated};
+
+use usb_device::class_prelude::*;
+use usb_device::prelude::*;
+use usbd_human_interface_device::device::joystick::JoystickReport;
+use usbd_human_interface_device::prelude::*;
+
+#[entry]
+fn main() -> ! {
+    info!("Program start");
+    let mut pac = pac::Peripherals::take().unwrap();
+    let core = pac::CorePeripherals::take().unwrap();
+    let mut watchdog = Watchdog::new(pac.WATCHDOG);
+    let sio = Sio::new(pac.SIO);
+
+    // External high-speed crystal on the pico board is 12Mhz
+    let external_xtal_freq_hz = 12_000_000u32;
+    let clocks = init_clocks_and_plls(
+        external_xtal_freq_hz,
+        pac.XOSC,
+        pac.CLOCKS,
+        pac.PLL_SYS,
+        pac.PLL_USB,
+        &mut pac.RESETS,
+        &mut watchdog,
+    )
+    .ok()
+    .unwrap();
+
+    let mut delay = cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().to_Hz());
+
+    let pins = bsp::Pins::new(
+        pac.IO_BANK0,
+        pac.PADS_BANK0,
+        sio.gpio_bank0,
+        &mut pac.RESETS,
+    );
+
+    let usb_bus = UsbBusAllocator::new(hal::usb::UsbBus::new(
+        pac.USBCTRL_REGS,
+        pac.USBCTRL_DPRAM,
+        clocks.usb_clock,
+        true,
+        &mut pac.RESETS,
+    ));
+
+    let mut joy = UsbHidClassBuilder::new()
+        .add_device(usbd_human_interface_device::device::joystick::JoystickConfig::default())
+        .build(&usb_bus);
+
+    //https://pid.codes
+    let mut usb_dev = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0x1209, 0x0001))
+        .manufacturer("usbd-human-interface-device")
+        .product("Rusty joystick")
+        .serial_number("TEST")
+        .build();
+
+    let sda_pin = pins.gpio8.into_function::<FunctionI2C>();
+    let scl_pin = pins.gpio9.into_function::<FunctionI2C>();
+
+    let i2c = bsp::hal::I2C::i2c0(
+        pac.I2C0,
+        sda_pin,
+        scl_pin,
+        100.kHz(),
+        &mut pac.RESETS,
+        &clocks.peripheral_clock,
+    );
+
+    // Create, initialise and calibrate the controller
+    let mut controller = Classic::new(i2c, &mut delay).unwrap();
+
+    let hi_res = false;
+
+    // Enable hi-resolution mode. This also updates calibration
+    // Don't really need it for this single stick mode. Plus it might make recovery easier...
+    if hi_res {
+        controller.enable_hires(&mut delay).unwrap();
+    }
+
+    // If you have a Nunchuk controller, use this instead.
+    // let mut controller = Nunchuk::new(i2c, &mut delay).unwrap();
+    loop {
+        // Some controllers need a delay between reads or they become unhappy
+        // delay.delay_ms(10);
+
+        // Capture the current button and axis values
+        let input = controller.read_blocking(&mut delay);
+        if let Ok(input) = input {
+            match joy.device().write_report(&get_report(&input)) {
+                Err(UsbHidError::WouldBlock) => {}
+                Ok(_) => {}
+                Err(e) => {
+                    core::panic!("Failed to write joystick report: {:?}", e)
+                }
+            }
+            // Print inputs from the controller
+            debug!("{:?}", input);
+        } else {
+            // re-init controller on failure
+            let _ = controller.init(&mut delay);
+            if hi_res {
+                let _ = controller.enable_hires(&mut delay);
+            }
+        }
+
+        if usb_dev.poll(&mut [&mut joy]) {}
+    }
+}
+
+fn get_report(input: &ClassicReadingCalibrated) -> JoystickReport {
+    // Read out buttons first
+    let mut buttons = 0;
+
+    buttons += input.button_b as u8;
+    buttons += (input.button_a as u8) << 1;
+    buttons += (input.button_y as u8) << 2;
+    buttons += (input.button_x as u8) << 3;
+    buttons += (input.button_trigger_l as u8) << 4;
+    buttons += (input.button_trigger_r as u8) << 5;
+    buttons += (input.button_minus as u8) << 6;
+    buttons += (input.button_plus as u8) << 7;
+
+    JoystickReport {
+        buttons,
+        x: input.joystick_left_x,
+        y: -input.joystick_left_y,
+    }
+}
+
+// End of file