embassy/examples/rp/src/bin/bluetooth.rs

//! This example test the RP Pico W on board LED.
//!
//! It does not work with the RP Pico board. See blinky.rs.

#![no_std]
#![no_main]

use bt_hci::controller::ExternalController;
use cyw43_pio::PioSpi;
use defmt::*;
use embassy_executor::Spawner;
use embassy_futures::join::join3;
use embassy_rp::bind_interrupts;
use embassy_rp::gpio::{Level, Output};
use embassy_rp::peripherals::{DMA_CH0, PIO0};
use embassy_rp::pio::{InterruptHandler, Pio};
use embassy_sync::blocking_mutex::raw::NoopRawMutex;
use embassy_time::{Duration, Timer};
use static_cell::StaticCell;
use trouble_host::advertise::{AdStructure, Advertisement, BR_EDR_NOT_SUPPORTED, LE_GENERAL_DISCOVERABLE};
use trouble_host::attribute::{AttributeTable, CharacteristicProp, Service, Uuid};
use trouble_host::gatt::GattEvent;
use trouble_host::{Address, BleHost, BleHostResources, PacketQos};
use {defmt_rtt as _, embassy_time as _, panic_probe as _};

bind_interrupts!(struct Irqs {
    PIO0_IRQ_0 => InterruptHandler<PIO0>;
});

#[embassy_executor::task]
async fn cyw43_task(runner: cyw43::Runner<'static, Output<'static>, PioSpi<'static, PIO0, 0, DMA_CH0>>) -> ! {
    runner.run().await
}

#[embassy_executor::main]
async fn main(spawner: Spawner) {
    let p = embassy_rp::init(Default::default());
    let fw = include_bytes!("../../../../cyw43-firmware/43439A0.bin");
    let clm = include_bytes!("../../../../cyw43-firmware/43439A0_clm.bin");
    let btfw = include_bytes!("../../../../cyw43-firmware/43439A0_btfw.bin");

    // To make flashing faster for development, you may want to flash the firmwares independently
    // at hardcoded addresses, instead of baking them into the program with `include_bytes!`:
    //     probe-rs download 43439A0.bin --format bin --chip RP2040 --base-address 0x10100000
    //     probe-rs download 43439A0_clm.bin --format bin --chip RP2040 --base-address 0x10140000
    //     probe-rs download 43439A0_btfw.bin --format bin --chip RP2040 --base-address 0x10141400
    //let fw = unsafe { core::slice::from_raw_parts(0x10100000 as *const u8, 224190) };
    //let clm = unsafe { core::slice::from_raw_parts(0x10140000 as *const u8, 4752) };
    //let btfw = unsafe { core::slice::from_raw_parts(0x10141400 as *const u8, 6164) };

    let pwr = Output::new(p.PIN_23, Level::Low);
    let cs = Output::new(p.PIN_25, Level::High);
    let mut pio = Pio::new(p.PIO0, Irqs);
    let spi = PioSpi::new(&mut pio.common, pio.sm0, pio.irq0, cs, p.PIN_24, p.PIN_29, p.DMA_CH0);

    static STATE: StaticCell<cyw43::State> = StaticCell::new();
    let state = STATE.init(cyw43::State::new());
    let (_net_device, bt_device, mut control, runner) = cyw43::new_with_bluetooth(state, pwr, spi, fw, btfw).await;
    unwrap!(spawner.spawn(cyw43_task(runner)));
    control.init(clm).await;

    let controller: ExternalController<_, 10> = ExternalController::new(bt_device);
    static HOST_RESOURCES: StaticCell<BleHostResources<4, 32, 27>> = StaticCell::new();
    let host_resources = HOST_RESOURCES.init(BleHostResources::new(PacketQos::None));

    let mut ble: BleHost<'_, _> = BleHost::new(controller, host_resources);

    ble.set_random_address(Address::random([0xff, 0x9f, 0x1a, 0x05, 0xe4, 0xff]));
    let mut table: AttributeTable<'_, NoopRawMutex, 10> = AttributeTable::new();

    // Generic Access Service (mandatory)
    let id = b"Pico W Bluetooth";
    let appearance = [0x80, 0x07];
    let mut bat_level = [0; 1];
    let handle = {
        let mut svc = table.add_service(Service::new(0x1800));
        let _ = svc.add_characteristic_ro(0x2a00, id);
        let _ = svc.add_characteristic_ro(0x2a01, &appearance[..]);
        svc.build();

        // Generic attribute service (mandatory)
        table.add_service(Service::new(0x1801));

        // Battery service
        let mut svc = table.add_service(Service::new(0x180f));

        svc.add_characteristic(
            0x2a19,
            &[CharacteristicProp::Read, CharacteristicProp::Notify],
            &mut bat_level,
        )
        .build()
    };

    let mut adv_data = [0; 31];
    AdStructure::encode_slice(
        &[
            AdStructure::Flags(LE_GENERAL_DISCOVERABLE | BR_EDR_NOT_SUPPORTED),
            AdStructure::ServiceUuids16(&[Uuid::Uuid16([0x0f, 0x18])]),
            AdStructure::CompleteLocalName(b"Pico W Bluetooth"),
        ],
        &mut adv_data[..],
    )
    .unwrap();

    let server = ble.gatt_server(&table);

    info!("Starting advertising and GATT service");
    let _ = join3(
        ble.run(),
        async {
            loop {
                match server.next().await {
                    Ok(GattEvent::Write { handle, connection: _ }) => {
                        let _ = table.get(handle, |value| {
                            info!("Write event. Value written: {:?}", value);
                        });
                    }
                    Ok(GattEvent::Read { .. }) => {
                        info!("Read event");
                    }
                    Err(e) => {
                        error!("Error processing GATT events: {:?}", e);
                    }
                }
            }
        },
        async {
            let mut advertiser = ble
                .advertise(
                    &Default::default(),
                    Advertisement::ConnectableScannableUndirected {
                        adv_data: &adv_data[..],
                        scan_data: &[],
                    },
                )
                .await
                .unwrap();
            let conn = advertiser.accept().await.unwrap();
            // Keep connection alive
            let mut tick: u8 = 0;
            loop {
                Timer::after(Duration::from_secs(10)).await;
                tick += 1;
                server.notify(handle, &conn, &[tick]).await.unwrap();
            }
        },
    )
    .await;
}