3️⃣ NRF52 + Embedded Rust Example

Target: NRF52840
Board: Adafruit Feather NRF52840

📌 Goal:

• BLE communication
• Low-power operation with WFE (Wait-for-Event)

🛠 Dependencies

[dependencies]
cortex-m = "0.7"
nrf52840-hal = { version = "0.14", features = ["rt"] }
ble = "0.5"
panic-halt = "0.2"

⚡ Code: BLE + Low Power

#![no_std]
#![no_main]

use cortex_m::asm::wfe;
use nrf52840_hal::{
    gpio::{p0::Parts, Level},
    pac::Peripherals,
    prelude::*,
};

#[entry]
fn main() -> ! {
    let dp = Peripherals::take().unwrap();
    let port0 = Parts::new(dp.P0);

    let led = port0.p0_13.into_push_pull_output(Level::High);

    loop {
        wfe(); // Wait-for-event (low-power mode)
        led.set_low().unwrap(); // Blink LED on wake-up
    }
}

✅ BLE-ready, low-power MCU operation
✅ Efficient wake-up using WFE