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#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
#[path = "../example_common.rs"]
mod example_common;
use core::mem;
use cortex_m_rt::entry;
use defmt::*;
use embassy_executor::executor::Executor;
use embassy_nrf::gpio::{AnyPin, Input, Pin as _, Pull};
use embassy_nrf::interrupt::Priority;
use embassy_util::Forever;
use futures::pin_mut;
use nrf_softdevice::ble::{gatt_server, peripheral};
use nrf_softdevice::{raw, Softdevice};
static EXECUTOR: Forever<Executor> = Forever::new();
#[embassy_executor::task]
async fn softdevice_task(sd: &'static Softdevice) {
sd.run().await;
}
#[nrf_softdevice::gatt_service(uuid = "9e7312e0-2354-11eb-9f10-fbc30a62cf38")]
struct FooService {
#[characteristic(uuid = "9e7312e0-2354-11eb-9f10-fbc30a63cf38", read, write, notify)]
foo: u16,
}
#[nrf_softdevice::gatt_server]
struct Server {
foo: FooService,
}
async fn run_bluetooth(sd: &'static Softdevice, server: &Server) {
#[rustfmt::skip]
let adv_data = &[
0x02, 0x01, raw::BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE as u8,
0x03, 0x03, 0x09, 0x18,
0x0a, 0x09, b'H', b'e', b'l', b'l', b'o', b'R', b'u', b's', b't',
];
#[rustfmt::skip]
let scan_data = &[
0x03, 0x03, 0x09, 0x18,
];
loop {
let config = peripheral::Config::default();
let adv = peripheral::ConnectableAdvertisement::ScannableUndirected { adv_data, scan_data };
let conn = unwrap!(peripheral::advertise_connectable(sd, adv, &config).await);
info!("advertising done!");
let res = gatt_server::run(&conn, server, |e| match e {
ServerEvent::Foo(FooServiceEvent::FooWrite(val)) => {
info!("wrote foo level: {}", val);
if let Err(e) = server.foo.foo_notify(&conn, val + 1) {
info!("send notification error: {:?}", e);
}
}
ServerEvent::Foo(FooServiceEvent::FooCccdWrite { notifications }) => {
info!("foo notifications: {}", notifications)
}
})
.await;
if let Err(e) = res {
info!("gatt_server run exited with error: {:?}", e);
}
}
}
#[embassy_executor::task]
async fn bluetooth_task(sd: &'static Softdevice, server: Server, button1: AnyPin, button2: AnyPin) {
info!("Bluetooth is OFF");
info!("Press nrf52840-dk button 1 to enable, button 2 to disable");
let button1 = Input::new(button1, Pull::Up);
let button2 = Input::new(button2, Pull::Up);
pin_mut!(button1);
pin_mut!(button2);
loop {
button1.as_mut().wait_for_low().await;
info!("Bluetooth ON!");
// Create a future that will run the bluetooth loop.
// Note the lack of `.await`! This creates the future but doesn't poll it yet.
let bluetooth_fut = run_bluetooth(sd, &server);
// Create a future that will resolve when the OFF button is pressed.
let off_fut = async {
button2.as_mut().wait_for_low().await;
info!("Bluetooth OFF!");
};
pin_mut!(bluetooth_fut);
pin_mut!(off_fut);
// Select the two futures.
//
// select() returns when one of the two futures returns. The other future is dropped before completing.
//
// Since the bluetooth future never finishes, this can only happen when the Off button is pressed.
// This will cause the bluetooth future to be dropped.
//
// If it was advertising, the nested `peripheral::advertise_connectable` future will be dropped, which will cause
// the softdevice to stop advertising.
// If it was connected, it will drop everything including the `Connection` instance, which
// will tell the softdevice to disconnect it.
//
// This demonstrates the awesome power of Rust's async-await combined with nrf-softdevice's async wrappers.
// It's super easy to cancel a complex tree of operations: just drop its future!
futures::future::select(bluetooth_fut, off_fut).await;
}
}
#[entry]
fn main() -> ! {
info!("Hello World!");
let mut config = embassy_nrf::config::Config::default();
config.gpiote_interrupt_priority = Priority::P2;
config.time_interrupt_priority = Priority::P2;
let p = embassy_nrf::init(config);
let config = nrf_softdevice::Config {
clock: Some(raw::nrf_clock_lf_cfg_t {
source: raw::NRF_CLOCK_LF_SRC_RC as u8,
rc_ctiv: 4,
rc_temp_ctiv: 2,
accuracy: 7,
}),
conn_gap: Some(raw::ble_gap_conn_cfg_t {
conn_count: 6,
event_length: 24,
}),
conn_gatt: Some(raw::ble_gatt_conn_cfg_t { att_mtu: 256 }),
gatts_attr_tab_size: Some(raw::ble_gatts_cfg_attr_tab_size_t { attr_tab_size: 32768 }),
gap_role_count: Some(raw::ble_gap_cfg_role_count_t {
adv_set_count: 1,
periph_role_count: 3,
central_role_count: 3,
central_sec_count: 0,
_bitfield_1: raw::ble_gap_cfg_role_count_t::new_bitfield_1(0),
}),
gap_device_name: Some(raw::ble_gap_cfg_device_name_t {
p_value: b"HelloRust" as *const u8 as _,
current_len: 9,
max_len: 9,
write_perm: unsafe { mem::zeroed() },
_bitfield_1: raw::ble_gap_cfg_device_name_t::new_bitfield_1(raw::BLE_GATTS_VLOC_STACK as u8),
}),
..Default::default()
};
let sd = Softdevice::enable(&config);
let executor = EXECUTOR.put(Executor::new());
executor.run(move |spawner| {
let server = unwrap!(Server::new(sd));
unwrap!(spawner.spawn(softdevice_task(sd)));
unwrap!(spawner.spawn(bluetooth_task(sd, server, p.P0_11.degrade(), p.P0_12.degrade())));
});
}
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