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#![deny(unused_must_use)]
use core::cell::RefCell;
use core::task::Context;
use embassy_net_driver::{Capabilities, HardwareAddress, LinkState};
use embassy_sync::blocking_mutex;
use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
use embassy_sync::channel::Channel;
use embassy_sync::mutex::Mutex;
use embassy_sync::waitqueue::AtomicWaker;
use crate::mac::event::MacEvent;
use crate::mac::indications::{write_frame_from_beacon_indication, write_frame_from_data_indication};
use crate::mac::runner::{BUF_SIZE, ZeroCopyPubSub};
use crate::mac::{Control, MTU, Runner};
use crate::sub::mac::{Mac, MacRx, MacTx};
pub struct NetworkState {
pub mac_addr: [u8; 8],
pub short_addr: [u8; 2],
pub pan_id: [u8; 2],
pub link_state: LinkState,
pub link_waker: AtomicWaker,
}
impl NetworkState {
pub const fn new() -> Self {
Self {
mac_addr: [0u8; 8],
short_addr: [0u8; 2],
pan_id: [0u8; 2],
link_state: LinkState::Down,
link_waker: AtomicWaker::new(),
}
}
}
pub struct DriverState<'d> {
pub mac_tx: Mutex<CriticalSectionRawMutex, MacTx>,
pub mac_rx: MacRx,
pub rx_event_channel: ZeroCopyPubSub<CriticalSectionRawMutex, MacEvent<'d>>,
pub rx_data_channel: Channel<CriticalSectionRawMutex, MacEvent<'d>, 1>,
pub tx_data_channel: Channel<CriticalSectionRawMutex, (&'d mut [u8; MTU], usize), BUF_SIZE>,
pub tx_buf_channel: Channel<CriticalSectionRawMutex, &'d mut [u8; MTU], BUF_SIZE>,
pub tx_buf_queue: [[u8; MTU]; BUF_SIZE],
pub network_state: blocking_mutex::Mutex<CriticalSectionRawMutex, RefCell<NetworkState>>,
}
impl<'d> DriverState<'d> {
pub const fn new(mac: Mac) -> Self {
let (mac_rx, mac_tx) = mac.split();
let mac_tx = Mutex::new(mac_tx);
Self {
mac_tx,
mac_rx,
rx_event_channel: ZeroCopyPubSub::new(RefCell::new(None)),
rx_data_channel: Channel::new(),
tx_data_channel: Channel::new(),
tx_buf_channel: Channel::new(),
tx_buf_queue: [[0u8; MTU]; BUF_SIZE],
network_state: blocking_mutex::Mutex::new(RefCell::new(NetworkState::new())),
}
}
}
pub struct Driver<'d> {
tx_data_channel: &'d Channel<CriticalSectionRawMutex, (&'d mut [u8; MTU], usize), BUF_SIZE>,
tx_buf_channel: &'d Channel<CriticalSectionRawMutex, &'d mut [u8; MTU], BUF_SIZE>,
rx_data_channel: &'d Channel<CriticalSectionRawMutex, MacEvent<'d>, 1>,
network_state: &'d blocking_mutex::Mutex<CriticalSectionRawMutex, RefCell<NetworkState>>,
}
impl<'d> Driver<'d> {
pub fn new(
driver_state: &'d mut DriverState<'d>,
short_address: [u8; 2],
mac_address: [u8; 8],
) -> (Self, Runner<'d>, Control<'d>) {
(
Self {
tx_data_channel: &driver_state.tx_data_channel,
tx_buf_channel: &driver_state.tx_buf_channel,
rx_data_channel: &driver_state.rx_data_channel,
network_state: &driver_state.network_state,
},
Runner::new(
&driver_state.rx_event_channel,
&driver_state.rx_data_channel,
&mut driver_state.mac_rx,
&driver_state.tx_data_channel,
&driver_state.tx_buf_channel,
&driver_state.mac_tx,
&mut driver_state.tx_buf_queue,
&driver_state.network_state,
short_address,
mac_address,
),
Control::new(
&driver_state.rx_event_channel,
&driver_state.mac_tx,
&driver_state.network_state,
),
)
}
}
impl<'d> embassy_net_driver::Driver for Driver<'d> {
// type RxToken<'a> = RxToken<'a, 'd> where Self: 'a;
// type TxToken<'a> = TxToken<'a, 'd> where Self: 'a;
type RxToken<'a>
= RxToken<'d>
where
Self: 'a;
type TxToken<'a>
= TxToken<'d>
where
Self: 'a;
fn receive(&mut self, cx: &mut Context) -> Option<(Self::RxToken<'_>, Self::TxToken<'_>)> {
if self.rx_data_channel.poll_ready_to_receive(cx).is_ready()
&& self.tx_buf_channel.poll_ready_to_receive(cx).is_ready()
{
Some((
RxToken {
rx: self.rx_data_channel,
},
TxToken {
tx: self.tx_data_channel,
tx_buf: self.tx_buf_channel,
},
))
} else {
None
}
}
fn transmit(&mut self, cx: &mut Context) -> Option<Self::TxToken<'_>> {
if self.tx_buf_channel.poll_ready_to_receive(cx).is_ready() {
Some(TxToken {
tx: self.tx_data_channel,
tx_buf: self.tx_buf_channel,
})
} else {
None
}
}
fn capabilities(&self) -> Capabilities {
let mut caps = Capabilities::default();
caps.max_transmission_unit = MTU;
// caps.max_burst_size = Some(self.tx.len());
caps
}
fn link_state(&mut self, cx: &mut Context) -> LinkState {
critical_section::with(|cs| {
let network_state = self.network_state.borrow(cs).borrow_mut();
// Unconditionally register the waker to avoid a race
network_state.link_waker.register(cx.waker());
network_state.link_state
})
}
fn hardware_address(&self) -> HardwareAddress {
HardwareAddress::Ieee802154(critical_section::with(|cs| {
self.network_state.borrow(cs).borrow().mac_addr
}))
}
}
pub struct RxToken<'d> {
rx: &'d Channel<CriticalSectionRawMutex, MacEvent<'d>, 1>,
}
impl<'d> embassy_net_driver::RxToken for RxToken<'d> {
fn consume<R, F>(self, f: F) -> R
where
F: FnOnce(&mut [u8]) -> R,
{
let mut buffer = [0u8; MTU];
match self.rx.try_receive().unwrap() {
MacEvent::McpsDataInd(data_event) => write_frame_from_data_indication(data_event, &mut buffer),
MacEvent::MlmeBeaconNotifyInd(data_event) => write_frame_from_beacon_indication(data_event, &mut buffer),
_ => {}
};
f(&mut buffer[..])
}
}
pub struct TxToken<'d> {
tx: &'d Channel<CriticalSectionRawMutex, (&'d mut [u8; MTU], usize), BUF_SIZE>,
tx_buf: &'d Channel<CriticalSectionRawMutex, &'d mut [u8; MTU], BUF_SIZE>,
}
impl<'d> embassy_net_driver::TxToken for TxToken<'d> {
fn consume<R, F>(self, len: usize, f: F) -> R
where
F: FnOnce(&mut [u8]) -> R,
{
// Only valid tx buffers should be put into the queue
let buf = self.tx_buf.try_receive().unwrap();
let r = f(&mut buf[..len]);
// The tx channel should always be of equal capacity to the tx_buf channel
self.tx.try_send((buf, len)).unwrap();
r
}
}
|
