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Merge #613

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613: Rust stable support r=Dirbaio a=Dirbaio

This PR adds (limited) stable Rust support!

The drawbacks are: 

- No `#[embassy::task]`, `#[embassy::main]`. (requires `type_alias_impl_trait`). You have to manually allocate the tasks somewhere they'll live forever. See [example](https://github.com/embassy-rs/embassy/blob/master/examples/nrf/src/bin/raw_spawn.rs)
- No async trait impls (requires GATs). Note that the full API surface of HALs is still available through inherent methods: #552 #581 
- Some stuff is not constructible in const (requires `const_fn_trait_bound`), although there's an (ugly) workaround for the generic `Mutex`.

So it's not that bad in the end, it's fully usable for shipping production-ready firmwares. We'll still recommend nightly as the default, until GATs and `type_alias_impl_trait` are stable.

Co-authored-by: Dario Nieuwenhuis <dirbaio@dirbaio.net>
This commit is contained in:
bors[bot] 2022-02-12 00:30:47 +00:00 committed by GitHub
commit e728a32672
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46 changed files with 988 additions and 848 deletions
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26
.github/workflows/rust.yml vendored
View File

@ -12,11 +12,11 @@ env:
jobs:
all:
runs-on: ubuntu-20.04
needs: [build, test]
needs: [build-nightly, build-stable, test]
steps:
- name: Done
run: exit 0
build:
build-nightly:
runs-on: ubuntu-latest
permissions:
id-token: write
@ -41,6 +41,28 @@ jobs:
chmod +x /usr/local/bin/cargo-batch
./ci.sh
rm -rf target_ci/*{,/release}/{build,deps,.fingerprint}/{lib,}{embassy,stm32}*
build-stable:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
with:
submodules: true
- name: Cache multiple paths
uses: actions/cache@v2
with:
path: |
~/.cargo/bin/
~/.cargo/registry/index/
~/.cargo/registry/cache/
~/.cargo/git/db/
target_ci_stable
key: rust-stable-${{ runner.os }}-${{ hashFiles('rust-toolchain.toml') }}
- name: build
run: |
curl -L -o /usr/local/bin/cargo-batch https://github.com/embassy-rs/cargo-batch/releases/download/batch-0.1.0/cargo-batch
chmod +x /usr/local/bin/cargo-batch
./ci_stable.sh
rm -rf target_ci_stable/*{,/release}/{build,deps,.fingerprint}/{lib,}{embassy,stm32}*
test:
runs-on: ubuntu-latest

1
.gitignore vendored
View File

@ -1,5 +1,6 @@
target
target_ci
target_ci_stable
Cargo.lock
third_party
/Cargo.toml

15
.vscode/settings.json vendored
View File

@ -4,16 +4,19 @@
"rust-analyzer.assist.importGranularity": "module",
"rust-analyzer.checkOnSave.allFeatures": false,
"rust-analyzer.checkOnSave.allTargets": false,
"rust-analyzer.checkOnSave.command": "clippy",
"rust-analyzer.checkOnSave.noDefaultFeatures": true,
"rust-analyzer.cargo.allFeatures": false,
"rust-analyzer.cargo.noDefaultFeatures": true,
"rust-analyzer.experimental.procAttrMacros": false,
"rust-analyzer.checkOnSave.noDefaultFeatures": true,
"rust-analyzer.procMacro.enable": true,
"rust-analyzer.cargo.runBuildScripts": true,
"rust-analyzer.cargo.target": "thumbv7em-none-eabi",
"rust-analyzer.cargo.features": [
// These are needed to prevent embassy-net from failing to build
//"embassy-net/medium-ethernet",
//"embassy-net/tcp",
//"embassy-net/pool-16",
"nightly",
],
"rust-analyzer.linkedProjects": [
// Declare for the target you wish to develop
@ -35,12 +38,4 @@
// "examples/stm32wl55/Cargo.toml",
// "examples/wasm/Cargo.toml",
],
"rust-analyzer.procMacro.enable": true,
"rust-analyzer.cargo.runBuildScripts": true,
"files.watcherExclude": {
"**/.git/objects/**": true,
"**/.git/subtree-cache/**": true,
"**/target/**": true
},
"git.ignoreLimitWarning": true
}

36
ci.sh
View File

@ -24,24 +24,24 @@ rm -rf stm32-metapac
mv stm32-metapac-gen/out stm32-metapac
cargo batch \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv7em-none-eabi \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv7em-none-eabi --features log,executor-agnostic \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv7em-none-eabi --features defmt \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv6m-none-eabi --features defmt \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52805,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52810,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52811,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52820,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52832,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52833,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nrf9160-s,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nrf9160-ns,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nrf5340-app-s,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nrf5340-app-ns,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nrf5340-net,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52840,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52840,log,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52840,defmt,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv7em-none-eabi --features nightly \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv7em-none-eabi --features nightly,log,executor-agnostic \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv7em-none-eabi --features nightly,defmt \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv6m-none-eabi --features nightly,defmt \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nightly,nrf52805,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nightly,nrf52810,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nightly,nrf52811,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nightly,nrf52820,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nightly,nrf52832,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nightly,nrf52833,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nightly,nrf9160-s,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nightly,nrf9160-ns,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nightly,nrf5340-app-s,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nightly,nrf5340-app-ns,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nightly,nrf5340-net,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nightly,nrf52840,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nightly,nrf52840,log,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nightly,nrf52840,defmt,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32f411ce,defmt,time-driver-any \
--- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32f411ce,defmt,time-driver-any,unstable-traits \
--- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32f429zi,log,time-driver-any \

30
ci_stable.sh Executable file
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@ -0,0 +1,30 @@
#!/bin/bash
set -euo pipefail
export CARGO_TARGET_DIR=$PWD/target_ci_stable
export RUSTFLAGS=-Dwarnings
export DEFMT_LOG=trace
sed -i 's/channel.*/channel = "stable"/g' rust-toolchain.toml
cargo batch \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv7em-none-eabi \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv7em-none-eabi --features log,executor-agnostic \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv7em-none-eabi --features defmt \
--- build --release --manifest-path embassy/Cargo.toml --target thumbv6m-none-eabi --features defmt \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52805,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52810,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52811,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52820,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52832,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52833,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nrf9160-s,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nrf9160-ns,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nrf5340-app-s,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nrf5340-app-ns,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features nrf5340-net,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52840,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52840,log,gpiote,time-driver-rtc1 \
--- build --release --manifest-path embassy-nrf/Cargo.toml --target thumbv7em-none-eabi --features nrf52840,defmt,gpiote,time-driver-rtc1,unstable-traits \
--- build --release --manifest-path examples/nrf/Cargo.toml --target thumbv7em-none-eabi --no-default-features --out-dir out/examples/nrf --bin raw_spawn \

4
docs/modules/ROOT/examples/basic/Cargo.toml
View File

@ -5,8 +5,8 @@ name = "embassy-basic-example"
version = "0.1.0"
[dependencies]
embassy = { version = "0.1.0", path = "../../../../../embassy", features = ["defmt"] }
embassy-nrf = { version = "0.1.0", path = "../../../../../embassy-nrf", features = ["defmt", "nrf52840", "time-driver-rtc1", "gpiote"] }
embassy = { version = "0.1.0", path = "../../../../../embassy", features = ["defmt", "nightly"] }
embassy-nrf = { version = "0.1.0", path = "../../../../../embassy-nrf", features = ["defmt", "nrf52840", "time-driver-rtc1", "gpiote", "nightly"] }
defmt = "0.3"
defmt-rtt = "0.3"

11
embassy-macros/src/chip/nrf.rs
View File

@ -1,11 +0,0 @@
use crate::path::ModulePrefix;
use proc_macro2::TokenStream;
use quote::quote;
pub fn generate(embassy_prefix: &ModulePrefix, config: syn::Expr) -> TokenStream {
let embassy_nrf_path = embassy_prefix.append("embassy_nrf").path();
quote!(
let p = #embassy_nrf_path::init(#config);
)
}

10
embassy-macros/src/chip/rp.rs
View File

@ -1,10 +0,0 @@
use crate::path::ModulePrefix;
use proc_macro2::TokenStream;
use quote::quote;
pub fn generate(embassy_prefix: &ModulePrefix, config: syn::Expr) -> TokenStream {
let embassy_rp_path = embassy_prefix.append("embassy_rp").path();
quote!(
let p = #embassy_rp_path::init(#config);
)
}

11
embassy-macros/src/chip/stm32.rs
View File

@ -1,11 +0,0 @@
use crate::path::ModulePrefix;
use proc_macro2::TokenStream;
use quote::quote;
pub fn generate(embassy_prefix: &ModulePrefix, config: syn::Expr) -> TokenStream {
let embassy_stm32_path = embassy_prefix.append("embassy_stm32").path();
quote!(
let p = #embassy_stm32_path::init(#config);
)
}

534
embassy-macros/src/lib.rs
View File

@ -1,228 +1,39 @@
#![feature(proc_macro_diagnostic)]
extern crate proc_macro;
use darling::FromMeta;
use proc_macro::TokenStream;
use proc_macro2::Span;
use quote::{format_ident, quote};
use std::iter;
use syn::spanned::Spanned;
use syn::{parse, Type, Visibility};
use syn::{ItemFn, ReturnType};
mod path;
use path::ModulePrefix;
#[derive(Debug, FromMeta)]
struct TaskArgs {
#[darling(default)]
pool_size: Option<usize>,
#[darling(default)]
send: bool,
#[darling(default)]
embassy_prefix: ModulePrefix,
}
mod macros;
mod util;
use macros::*;
#[proc_macro_attribute]
pub fn task(args: TokenStream, item: TokenStream) -> TokenStream {
let macro_args = syn::parse_macro_input!(args as syn::AttributeArgs);
let mut task_fn = syn::parse_macro_input!(item as syn::ItemFn);
let args = syn::parse_macro_input!(args as syn::AttributeArgs);
let f = syn::parse_macro_input!(item as syn::ItemFn);
let macro_args = match TaskArgs::from_list(&macro_args) {
Ok(v) => v,
Err(e) => {
return TokenStream::from(e.write_errors());
}
};
let embassy_prefix = macro_args.embassy_prefix.append("embassy");
let embassy_path = embassy_prefix.path();
let pool_size: usize = macro_args.pool_size.unwrap_or(1);
let mut fail = false;
if task_fn.sig.asyncness.is_none() {
task_fn
.sig
.span()
.unwrap()
.error("task functions must be async")
.emit();
fail = true;
}
if !task_fn.sig.generics.params.is_empty() {
task_fn
.sig
.span()
.unwrap()
.error("task functions must not be generic")
.emit();
fail = true;
}
if pool_size < 1 {
return parse::Error::new(Span::call_site(), "pool_size must be 1 or greater")
.to_compile_error()
.into();
}
let mut arg_names: syn::punctuated::Punctuated<syn::Ident, syn::Token![,]> =
syn::punctuated::Punctuated::new();
let mut args = task_fn.sig.inputs.clone();
for arg in args.iter_mut() {
match arg {
syn::FnArg::Receiver(_) => {
arg.span()
.unwrap()
.error("task functions must not have receiver arguments")
.emit();
fail = true;
}
syn::FnArg::Typed(t) => match t.pat.as_mut() {
syn::Pat::Ident(i) => {
arg_names.push(i.ident.clone());
i.mutability = None;
}
_ => {
arg.span()
.unwrap()
.error("pattern matching in task arguments is not yet supporteds")
.emit();
fail = true;
}
},
}
}
if fail {
return TokenStream::new();
}
let name = task_fn.sig.ident.clone();
let visibility = &task_fn.vis;
task_fn.sig.ident = format_ident!("task");
let impl_ty = if macro_args.send {
quote!(impl ::core::future::Future + Send + 'static)
} else {
quote!(impl ::core::future::Future + 'static)
};
let attrs = &task_fn.attrs;
let result = quote! {
#(#attrs)*
#visibility fn #name(#args) -> #embassy_path::executor::SpawnToken<#impl_ty> {
use #embassy_path::executor::raw::TaskStorage;
#task_fn
type F = #impl_ty;
#[allow(clippy::declare_interior_mutable_const)]
const NEW_TASK: TaskStorage<F> = TaskStorage::new();
static POOL: [TaskStorage<F>; #pool_size] = [NEW_TASK; #pool_size];
unsafe { TaskStorage::spawn_pool(&POOL, move || task(#arg_names)) }
}
};
result.into()
task::run(args, f).unwrap_or_else(|x| x).into()
}
#[proc_macro_attribute]
pub fn interrupt(args: TokenStream, input: TokenStream) -> TokenStream {
let mut f: ItemFn = syn::parse(input).expect("`#[interrupt]` must be applied to a function");
pub fn main(args: TokenStream, item: TokenStream) -> TokenStream {
let args = syn::parse_macro_input!(args as syn::AttributeArgs);
let f = syn::parse_macro_input!(item as syn::ItemFn);
main::run(args, f).unwrap_or_else(|x| x).into()
}
if !args.is_empty() {
return parse::Error::new(Span::call_site(), "This attribute accepts no arguments")
.to_compile_error()
.into();
}
let fspan = f.span();
let ident = f.sig.ident.clone();
let ident_s = ident.to_string();
// XXX should we blacklist other attributes?
let valid_signature = f.sig.constness.is_none()
&& f.vis == Visibility::Inherited
&& f.sig.abi.is_none()
&& f.sig.inputs.is_empty()
&& f.sig.generics.params.is_empty()
&& f.sig.generics.where_clause.is_none()
&& f.sig.variadic.is_none()
&& match f.sig.output {
ReturnType::Default => true,
ReturnType::Type(_, ref ty) => match **ty {
Type::Tuple(ref tuple) => tuple.elems.is_empty(),
Type::Never(..) => true,
_ => false,
},
};
if !valid_signature {
return parse::Error::new(
fspan,
"`#[interrupt]` handlers must have signature `[unsafe] fn() [-> !]`",
)
.to_compile_error()
.into();
}
f.block.stmts = iter::once(
syn::parse2(quote! {{
// Check that this interrupt actually exists
let __irq_exists_check: interrupt::#ident;
}})
.unwrap(),
)
.chain(f.block.stmts)
.collect();
quote!(
#[doc(hidden)]
#[export_name = #ident_s]
#[allow(non_snake_case)]
#f
)
.into()
#[proc_macro_attribute]
pub fn interrupt(args: TokenStream, item: TokenStream) -> TokenStream {
let args = syn::parse_macro_input!(args as syn::AttributeArgs);
let f = syn::parse_macro_input!(item as syn::ItemFn);
interrupt::run(args, f).unwrap_or_else(|x| x).into()
}
#[proc_macro]
pub fn interrupt_declare(item: TokenStream) -> TokenStream {
let name = syn::parse_macro_input!(item as syn::Ident);
let name = format_ident!("{}", name);
let name_interrupt = format_ident!("{}", name);
let name_handler = format!("__EMBASSY_{}_HANDLER", name);
let result = quote! {
#[allow(non_camel_case_types)]
pub struct #name_interrupt(());
unsafe impl ::embassy::interrupt::Interrupt for #name_interrupt {
type Priority = crate::interrupt::Priority;
fn number(&self) -> u16 {
use cortex_m::interrupt::InterruptNumber;
let irq = InterruptEnum::#name;
irq.number() as u16
}
unsafe fn steal() -> Self {
Self(())
}
unsafe fn __handler(&self) -> &'static ::embassy::interrupt::Handler {
#[export_name = #name_handler]
static HANDLER: ::embassy::interrupt::Handler = ::embassy::interrupt::Handler::new();
&HANDLER
}
}
unsafe impl ::embassy::util::Unborrow for #name_interrupt {
type Target = #name_interrupt;
unsafe fn unborrow(self) -> #name_interrupt {
self
}
}
};
result.into()
interrupt_declare::run(name).unwrap_or_else(|x| x).into()
}
/// # interrupt_take procedural macro
///
/// core::panic! is used as a default way to panic in this macro as there is no sensible way of enabling/disabling defmt for macro generation.
@ -231,312 +42,5 @@ pub fn interrupt_declare(item: TokenStream) -> TokenStream {
#[proc_macro]
pub fn interrupt_take(item: TokenStream) -> TokenStream {
let name = syn::parse_macro_input!(item as syn::Ident);
let name = format!("{}", name);
let name_interrupt = format_ident!("{}", name);
let name_handler = format!("__EMBASSY_{}_HANDLER", name);
let result = quote! {
{
#[allow(non_snake_case)]
#[export_name = #name]
pub unsafe extern "C" fn trampoline() {
extern "C" {
#[link_name = #name_handler]
static HANDLER: ::embassy::interrupt::Handler;
}
let func = HANDLER.func.load(::embassy::export::atomic::Ordering::Relaxed);
let ctx = HANDLER.ctx.load(::embassy::export::atomic::Ordering::Relaxed);
let func: fn(*mut ()) = ::core::mem::transmute(func);
func(ctx)
}
static TAKEN: ::embassy::export::atomic::AtomicBool = ::embassy::export::atomic::AtomicBool::new(false);
if TAKEN.compare_exchange(false, true, ::embassy::export::atomic::Ordering::AcqRel, ::embassy::export::atomic::Ordering::Acquire).is_err() {
core::panic!("IRQ Already taken");
}
let irq: interrupt::#name_interrupt = unsafe { ::core::mem::transmute(()) };
irq
}
};
result.into()
}
#[cfg(feature = "stm32")]
#[path = "chip/stm32.rs"]
mod chip;
#[cfg(feature = "nrf")]
#[path = "chip/nrf.rs"]
mod chip;
#[cfg(feature = "rp")]
#[path = "chip/rp.rs"]
mod chip;
#[cfg(any(
feature = "nrf",
feature = "rp",
feature = "stm32",
feature = "wasm",
feature = "std"
))]
#[derive(Debug, FromMeta)]
struct MainArgs {
#[darling(default)]
embassy_prefix: ModulePrefix,
#[allow(unused)]
#[darling(default)]
config: Option<syn::LitStr>,
}
#[cfg(any(feature = "nrf", feature = "rp", feature = "stm32"))]
#[proc_macro_attribute]
pub fn main(args: TokenStream, item: TokenStream) -> TokenStream {
let macro_args = syn::parse_macro_input!(args as syn::AttributeArgs);
let task_fn = syn::parse_macro_input!(item as syn::ItemFn);
let macro_args = match MainArgs::from_list(&macro_args) {
Ok(v) => v,
Err(e) => {
return TokenStream::from(e.write_errors());
}
};
let mut fail = false;
if task_fn.sig.asyncness.is_none() {
task_fn
.sig
.span()
.unwrap()
.error("task functions must be async")
.emit();
fail = true;
}
if !task_fn.sig.generics.params.is_empty() {
task_fn
.sig
.span()
.unwrap()
.error("main function must not be generic")
.emit();
fail = true;
}
let args = task_fn.sig.inputs.clone();
if args.len() != 2 {
task_fn
.sig
.span()
.unwrap()
.error("main function must have 2 arguments")
.emit();
fail = true;
}
if fail {
return TokenStream::new();
}
let embassy_prefix = macro_args.embassy_prefix;
let embassy_prefix_lit = embassy_prefix.literal();
let embassy_path = embassy_prefix.append("embassy").path();
let task_fn_body = task_fn.block;
let config = macro_args
.config
.map(|s| s.parse::<syn::Expr>().unwrap())
.unwrap_or_else(|| {
syn::Expr::Verbatim(quote! {
Default::default()
})
});
let chip_setup = chip::generate(&embassy_prefix, config);
let result = quote! {
#[#embassy_path::task(embassy_prefix = #embassy_prefix_lit)]
async fn __embassy_main(#args) {
#task_fn_body
}
#[cortex_m_rt::entry]
fn main() -> ! {
unsafe fn make_static<T>(t: &mut T) -> &'static mut T {
::core::mem::transmute(t)
}
#chip_setup
let mut executor = #embassy_path::executor::Executor::new();
let executor = unsafe { make_static(&mut executor) };
executor.run(|spawner| {
spawner.must_spawn(__embassy_main(spawner, p));
})
}
};
result.into()
}
#[cfg(feature = "std")]
#[proc_macro_attribute]
pub fn main(args: TokenStream, item: TokenStream) -> TokenStream {
let macro_args = syn::parse_macro_input!(args as syn::AttributeArgs);
let task_fn = syn::parse_macro_input!(item as syn::ItemFn);
let macro_args = match MainArgs::from_list(&macro_args) {
Ok(v) => v,
Err(e) => {
return TokenStream::from(e.write_errors());
}
};
let embassy_path = macro_args.embassy_prefix.append("embassy");
let mut fail = false;
if task_fn.sig.asyncness.is_none() {
task_fn
.sig
.span()
.unwrap()
.error("task functions must be async")
.emit();
fail = true;
}
if !task_fn.sig.generics.params.is_empty() {
task_fn
.sig
.span()
.unwrap()
.error("main function must not be generic")
.emit();
fail = true;
}
let args = task_fn.sig.inputs.clone();
if args.len() != 1 {
task_fn
.sig
.span()
.unwrap()
.error("main function must have one argument")
.emit();
fail = true;
}
if fail {
return TokenStream::new();
}
let task_fn_body = task_fn.block.clone();
let embassy_path = embassy_path.path();
let embassy_prefix_lit = macro_args.embassy_prefix.literal();
let result = quote! {
#[#embassy_path::task(embassy_prefix = #embassy_prefix_lit)]
async fn __embassy_main(#args) {
#task_fn_body
}
fn main() -> ! {
unsafe fn make_static<T>(t: &mut T) -> &'static mut T {
::core::mem::transmute(t)
}
let mut executor = #embassy_path::executor::Executor::new();
let executor = unsafe { make_static(&mut executor) };
executor.run(|spawner| {
spawner.spawn(__embassy_main(spawner)).unwrap();
})
}
};
result.into()
}
#[cfg(feature = "wasm")]
#[proc_macro_attribute]
pub fn main(args: TokenStream, item: TokenStream) -> TokenStream {
let macro_args = syn::parse_macro_input!(args as syn::AttributeArgs);
let task_fn = syn::parse_macro_input!(item as syn::ItemFn);
let macro_args = match MainArgs::from_list(&macro_args) {
Ok(v) => v,
Err(e) => {
return TokenStream::from(e.write_errors());
}
};
let embassy_path = macro_args.embassy_prefix.append("embassy");
let mut fail = false;
if task_fn.sig.asyncness.is_none() {
task_fn
.sig
.span()
.unwrap()
.error("task functions must be async")
.emit();
fail = true;
}
if !task_fn.sig.generics.params.is_empty() {
task_fn
.sig
.span()
.unwrap()
.error("main function must not be generic")
.emit();
fail = true;
}
let args = task_fn.sig.inputs.clone();
if args.len() != 1 {
task_fn
.sig
.span()
.unwrap()
.error("main function must have one argument")
.emit();
fail = true;
}
if fail {
return TokenStream::new();
}
let task_fn_body = task_fn.block.clone();
let embassy_path = embassy_path.path();
let embassy_prefix_lit = macro_args.embassy_prefix.literal();
let result = quote! {
#[#embassy_path::task(embassy_prefix = #embassy_prefix_lit)]
async fn __embassy_main(#args) {
#task_fn_body
}
use wasm_bindgen::prelude::*;
#[wasm_bindgen(start)]
pub fn main() -> Result<(), JsValue> {
static EXECUTOR: #embassy_path::util::Forever<#embassy_path::executor::Executor> = #embassy_path::util::Forever::new();
let executor = EXECUTOR.put(#embassy_path::executor::Executor::new());
executor.start(|spawner| {
spawner.spawn(__embassy_main(spawner)).unwrap();
});
Ok(())
}
};
result.into()
interrupt_take::run(name).unwrap_or_else(|x| x).into()
}

66
embassy-macros/src/macros/interrupt.rs Normal file
View File

@ -0,0 +1,66 @@
use darling::FromMeta;
use proc_macro2::TokenStream;
use quote::quote;
use std::iter;
use syn::ReturnType;
use syn::{Type, Visibility};
use crate::util::ctxt::Ctxt;
#[derive(Debug, FromMeta)]
struct Args {}
pub fn run(args: syn::AttributeArgs, mut f: syn::ItemFn) -> Result<TokenStream, TokenStream> {
let _args = Args::from_list(&args).map_err(|e| e.write_errors())?;
let ident = f.sig.ident.clone();
let ident_s = ident.to_string();
// XXX should we blacklist other attributes?
let valid_signature = f.sig.constness.is_none()
&& f.vis == Visibility::Inherited
&& f.sig.abi.is_none()
&& f.sig.inputs.is_empty()
&& f.sig.generics.params.is_empty()
&& f.sig.generics.where_clause.is_none()
&& f.sig.variadic.is_none()
&& match f.sig.output {
ReturnType::Default => true,
ReturnType::Type(_, ref ty) => match **ty {
Type::Tuple(ref tuple) => tuple.elems.is_empty(),
Type::Never(..) => true,
_ => false,
},
};
let ctxt = Ctxt::new();
if !valid_signature {
ctxt.error_spanned_by(
&f.sig,
"`#[interrupt]` handlers must have signature `[unsafe] fn() [-> !]`",
);
}
ctxt.check()?;
f.block.stmts = iter::once(
syn::parse2(quote! {{
// Check that this interrupt actually exists
let __irq_exists_check: interrupt::#ident;
}})
.unwrap(),
)
.chain(f.block.stmts)
.collect();
let result = quote!(
#[doc(hidden)]
#[export_name = #ident_s]
#[allow(non_snake_case)]
#f
);
Ok(result)
}

37
embassy-macros/src/macros/interrupt_declare.rs Normal file
View File

@ -0,0 +1,37 @@
use proc_macro2::TokenStream;
use quote::{format_ident, quote};
pub fn run(name: syn::Ident) -> Result<TokenStream, TokenStream> {
let name = format_ident!("{}", name);
let name_interrupt = format_ident!("{}", name);
let name_handler = format!("__EMBASSY_{}_HANDLER", name);
let result = quote! {
#[allow(non_camel_case_types)]
pub struct #name_interrupt(());
unsafe impl ::embassy::interrupt::Interrupt for #name_interrupt {
type Priority = crate::interrupt::Priority;
fn number(&self) -> u16 {
use cortex_m::interrupt::InterruptNumber;
let irq = InterruptEnum::#name;
irq.number() as u16
}
unsafe fn steal() -> Self {
Self(())
}
unsafe fn __handler(&self) -> &'static ::embassy::interrupt::Handler {
#[export_name = #name_handler]
static HANDLER: ::embassy::interrupt::Handler = ::embassy::interrupt::Handler::new();
&HANDLER
}
}
unsafe impl ::embassy::util::Unborrow for #name_interrupt {
type Target = #name_interrupt;
unsafe fn unborrow(self) -> #name_interrupt {
self
}
}
};
Ok(result)
}

36
embassy-macros/src/macros/interrupt_take.rs Normal file
View File

@ -0,0 +1,36 @@
use proc_macro2::TokenStream;
use quote::{format_ident, quote};
pub fn run(name: syn::Ident) -> Result<TokenStream, TokenStream> {
let name = format!("{}", name);
let name_interrupt = format_ident!("{}", name);
let name_handler = format!("__EMBASSY_{}_HANDLER", name);
let result = quote! {
{
#[allow(non_snake_case)]
#[export_name = #name]
pub unsafe extern "C" fn trampoline() {
extern "C" {
#[link_name = #name_handler]
static HANDLER: ::embassy::interrupt::Handler;
}
let func = HANDLER.func.load(::embassy::export::atomic::Ordering::Relaxed);
let ctx = HANDLER.ctx.load(::embassy::export::atomic::Ordering::Relaxed);
let func: fn(*mut ()) = ::core::mem::transmute(func);
func(ctx)
}
static TAKEN: ::embassy::export::atomic::AtomicBool = ::embassy::export::atomic::AtomicBool::new(false);
if TAKEN.compare_exchange(false, true, ::embassy::export::atomic::Ordering::AcqRel, ::embassy::export::atomic::Ordering::Acquire).is_err() {
core::panic!("IRQ Already taken");
}
let irq: interrupt::#name_interrupt = unsafe { ::core::mem::transmute(()) };
irq
}
};
Ok(result)
}

135
embassy-macros/src/macros/main.rs Normal file
View File

@ -0,0 +1,135 @@
use darling::FromMeta;
use proc_macro2::TokenStream;
use quote::quote;
use crate::util::ctxt::Ctxt;
use crate::util::path::ModulePrefix;
#[cfg(feature = "stm32")]
const HAL: Option<&str> = Some("embassy_stm32");
#[cfg(feature = "nrf")]
const HAL: Option<&str> = Some("embassy_nrf");
#[cfg(feature = "rp")]
const HAL: Option<&str> = Some("embassy_rp");
#[cfg(not(any(feature = "stm32", feature = "nrf", feature = "rp")))]
const HAL: Option<&str> = None;
#[derive(Debug, FromMeta)]
struct Args {
#[darling(default)]
embassy_prefix: ModulePrefix,
#[allow(unused)]
#[darling(default)]
config: Option<syn::LitStr>,
}
pub fn run(args: syn::AttributeArgs, f: syn::ItemFn) -> Result<TokenStream, TokenStream> {
let args = Args::from_list(&args).map_err(|e| e.write_errors())?;
let fargs = f.sig.inputs.clone();
let ctxt = Ctxt::new();
if f.sig.asyncness.is_none() {
ctxt.error_spanned_by(&f.sig, "task functions must be async");
}
if !f.sig.generics.params.is_empty() {
ctxt.error_spanned_by(&f.sig, "task functions must not be generic");
}
if HAL.is_some() && fargs.len() != 2 {
ctxt.error_spanned_by(&f.sig, "main function must have 2 arguments");
}
if HAL.is_none() && fargs.len() != 1 {
ctxt.error_spanned_by(&f.sig, "main function must have 2 arguments");
}
ctxt.check()?;
let embassy_prefix = args.embassy_prefix;
let embassy_prefix_lit = embassy_prefix.literal();
let embassy_path = embassy_prefix.append("embassy").path();
let f_body = f.block;
#[cfg(feature = "wasm")]
let main = quote! {
#[wasm_bindgen::prelude::wasm_bindgen(start)]
pub fn main() -> Result<(), wasm_bindgen::JsValue> {
static EXECUTOR: #embassy_path::util::Forever<#embassy_path::executor::Executor> = #embassy_path::util::Forever::new();
let executor = EXECUTOR.put(#embassy_path::executor::Executor::new());
executor.start(|spawner| {
spawner.spawn(__embassy_main(spawner)).unwrap();
});
Ok(())
}
};
#[cfg(all(feature = "std", not(feature = "wasm")))]
let main = quote! {
fn main() -> ! {
let mut executor = #embassy_path::executor::Executor::new();
let executor = unsafe { __make_static(&mut executor) };
executor.run(|spawner| {
spawner.must_spawn(__embassy_main(spawner));
})
}
};
#[cfg(all(not(feature = "std"), not(feature = "wasm")))]
let main = {
let config = args
.config
.map(|s| s.parse::<syn::Expr>().unwrap())
.unwrap_or_else(|| {
syn::Expr::Verbatim(quote! {
Default::default()
})
});
let (hal_setup, peris_arg) = match HAL {
Some(hal) => {
let embassy_hal_path = embassy_prefix.append(hal).path();
(
quote!(
let p = #embassy_hal_path::init(#config);
),
quote!(p),
)
}
None => (quote!(), quote!()),
};
quote! {
#[cortex_m_rt::entry]
fn main() -> ! {
#hal_setup
let mut executor = #embassy_path::executor::Executor::new();
let executor = unsafe { __make_static(&mut executor) };
executor.run(|spawner| {
spawner.must_spawn(__embassy_main(spawner, #peris_arg));
})
}
}
};
let result = quote! {
#[#embassy_path::task(embassy_prefix = #embassy_prefix_lit)]
async fn __embassy_main(#fargs) {
#f_body
}
unsafe fn __make_static<T>(t: &mut T) -> &'static mut T {
::core::mem::transmute(t)
}
#main
};
Ok(result)
}

5
embassy-macros/src/macros/mod.rs Normal file
View File

@ -0,0 +1,5 @@
pub mod interrupt;
pub mod interrupt_declare;
pub mod interrupt_take;
pub mod main;
pub mod task;

90
embassy-macros/src/macros/task.rs Normal file
View File

@ -0,0 +1,90 @@
use darling::FromMeta;
use proc_macro2::TokenStream;
use quote::{format_ident, quote};
use crate::util::ctxt::Ctxt;
use crate::util::path::ModulePrefix;
#[derive(Debug, FromMeta)]
struct Args {
#[darling(default)]
pool_size: Option<usize>,
#[darling(default)]
send: bool,
#[darling(default)]
embassy_prefix: ModulePrefix,
}
pub fn run(args: syn::AttributeArgs, mut f: syn::ItemFn) -> Result<TokenStream, TokenStream> {
let args = Args::from_list(&args).map_err(|e| e.write_errors())?;
let embassy_prefix = args.embassy_prefix.append("embassy");
let embassy_path = embassy_prefix.path();
let pool_size: usize = args.pool_size.unwrap_or(1);
let ctxt = Ctxt::new();
if f.sig.asyncness.is_none() {
ctxt.error_spanned_by(&f.sig, "task functions must be async");
}
if !f.sig.generics.params.is_empty() {
ctxt.error_spanned_by(&f.sig, "task functions must not be generic");
}
if pool_size < 1 {
ctxt.error_spanned_by(&f.sig, "pool_size must be 1 or greater");
}
let mut arg_names: syn::punctuated::Punctuated<syn::Ident, syn::Token![,]> =
syn::punctuated::Punctuated::new();
let mut fargs = f.sig.inputs.clone();
for arg in fargs.iter_mut() {
match arg {
syn::FnArg::Receiver(_) => {
ctxt.error_spanned_by(arg, "task functions must not have receiver arguments");
}
syn::FnArg::Typed(t) => match t.pat.as_mut() {
syn::Pat::Ident(i) => {
arg_names.push(i.ident.clone());
i.mutability = None;
}
_ => {
ctxt.error_spanned_by(
arg,
"pattern matching in task arguments is not yet supporteds",
);
}
},
}
}
ctxt.check()?;
let name = f.sig.ident.clone();
let visibility = &f.vis;
f.sig.ident = format_ident!("task");
let impl_ty = if args.send {
quote!(impl ::core::future::Future + Send + 'static)
} else {
quote!(impl ::core::future::Future + 'static)
};
let attrs = &f.attrs;
let result = quote! {
#(#attrs)*
#visibility fn #name(#fargs) -> #embassy_path::executor::SpawnToken<#impl_ty> {
use #embassy_path::executor::raw::TaskStorage;
#f
type F = #impl_ty;
#[allow(clippy::declare_interior_mutable_const)]
const NEW_TASK: TaskStorage<F> = TaskStorage::new();
static POOL: [TaskStorage<F>; #pool_size] = [NEW_TASK; #pool_size];
unsafe { TaskStorage::spawn_pool(&POOL, move || task(#arg_names)) }
}
};
Ok(result)
}

72
embassy-macros/src/util/ctxt.rs Normal file
View File

@ -0,0 +1,72 @@
// nifty utility borrowed from serde :)
// https://github.com/serde-rs/serde/blob/master/serde_derive/src/internals/ctxt.rs
use proc_macro2::TokenStream;
use quote::{quote, ToTokens};
use std::cell::RefCell;
use std::fmt::Display;
use std::thread;
use syn;
/// A type to collect errors together and format them.
///
/// Dropping this object will cause a panic. It must be consumed using `check`.
///
/// References can be shared since this type uses run-time exclusive mut checking.
#[derive(Default)]
pub struct Ctxt {
// The contents will be set to `None` during checking. This is so that checking can be
// enforced.
errors: RefCell<Option<Vec<syn::Error>>>,
}
impl Ctxt {
/// Create a new context object.
///
/// This object contains no errors, but will still trigger a panic if it is not `check`ed.
pub fn new() -> Self {
Ctxt {
errors: RefCell::new(Some(Vec::new())),
}
}
/// Add an error to the context object with a tokenenizable object.
///
/// The object is used for spanning in error messages.
pub fn error_spanned_by<A: ToTokens, T: Display>(&self, obj: A, msg: T) {
self.errors
.borrow_mut()
.as_mut()
.unwrap()
// Curb monomorphization from generating too many identical methods.
.push(syn::Error::new_spanned(obj.into_token_stream(), msg));
}
/// Add one of Syn's parse errors.
#[allow(unused)]
pub fn syn_error(&self, err: syn::Error) {
self.errors.borrow_mut().as_mut().unwrap().push(err);
}
/// Consume this object, producing a formatted error string if there are errors.
pub fn check(self) -> Result<(), TokenStream> {
let errors = self.errors.borrow_mut().take().unwrap();
match errors.len() {
0 => Ok(()),
_ => Err(to_compile_errors(errors)),
}
}
}
fn to_compile_errors(errors: Vec<syn::Error>) -> proc_macro2::TokenStream {
let compile_errors = errors.iter().map(syn::Error::to_compile_error);
quote!(#(#compile_errors)*)
}
impl Drop for Ctxt {
fn drop(&mut self) {
if !thread::panicking() && self.errors.borrow().is_some() {
panic!("forgot to check for errors");
}
}
}

2
embassy-macros/src/util/mod.rs Normal file
View File

@ -0,0 +1,2 @@
pub mod ctxt;
pub mod path;

0
embassy-macros/src/path.rs → embassy-macros/src/util/path.rs
View File

8
embassy-nrf/Cargo.toml
View File

@ -6,14 +6,18 @@ edition = "2018"
[features]
# Enable nightly-only features
nightly = ["embassy/nightly", "embedded-hal-1", "embedded-hal-async"]
# Reexport the PAC for the currently enabled chip at `embassy_nrf::pac`.
# This is unstable because semver-minor (non-breaking) releases of embassy-nrf may major-bump (breaking) the PAC version.
# If this is an issue for you, you're encouraged to directly depend on a fixed version of the PAC.
# There are no plans to make this stable.
unstable-pac = []
# Implement embedded-hal 1.0 alpha and embedded-hal-async traits.
unstable-traits = ["embedded-hal-1", "embedded-hal-async"]
# Implement embedded-hal 1.0 alpha traits.
# Implement embedded-hal-async traits if `nightly` is set as well.
unstable-traits = ["embedded-hal-1"]
nrf52805 = ["nrf52805-pac", "_ppi"]
nrf52810 = ["nrf52810-pac", "_ppi"]

7
embassy-nrf/src/gpiote.rs
View File

@ -463,7 +463,6 @@ mod eh02 {
#[cfg(feature = "unstable-traits")]
mod eh1 {
use super::*;
use futures::FutureExt;
impl<'d, C: Channel, T: GpioPin> embedded_hal_1::digital::ErrorType for InputChannel<'d, C, T> {
type Error = Infallible;
@ -480,6 +479,12 @@ mod eh1 {
self.pin.is_low()
}
}
}
#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
mod eh1a {
use super::*;
use futures::FutureExt;
impl<'d, T: GpioPin> embedded_hal_async::digital::Wait for Input<'d, T> {
type WaitForHighFuture<'a>

6
embassy-nrf/src/lib.rs
View File

@ -1,6 +1,8 @@
#![no_std]
#![feature(generic_associated_types)]
#![feature(type_alias_impl_trait)]
#![cfg_attr(
feature = "nightly",
feature(generic_associated_types, type_alias_impl_trait)
)]
#[cfg(not(any(
feature = "nrf51",

9
embassy-nrf/src/spim.rs
View File

@ -374,7 +374,6 @@ mod eh02 {
#[cfg(feature = "unstable-traits")]
mod eh1 {
use super::*;
use core::future::Future;
impl embedded_hal_1::spi::Error for Error {
fn kind(&self) -> embedded_hal_1::spi::ErrorKind {
@ -437,7 +436,7 @@ mod eh1 {
fn transaction<'a>(
&mut self,
operations: &mut [embedded_hal_async::spi::Operation<'a, u8>],
operations: &mut [embedded_hal_1::spi::blocking::Operation<'a, u8>],
) -> Result<(), Self::Error> {
use embedded_hal_1::spi::blocking::Operation;
for o in operations {
@ -451,6 +450,12 @@ mod eh1 {
Ok(())
}
}
}
#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
mod eh1a {
use super::*;
use core::future::Future;
impl<'d, T: Instance> embedded_hal_async::spi::Read<u8> for Spim<'d, T> {
type ReadFuture<'a>

3
embassy-nrf/src/time_driver.rs
View File

@ -2,6 +2,7 @@ use core::cell::Cell;
use core::sync::atomic::{compiler_fence, AtomicU32, AtomicU8, Ordering};
use core::{mem, ptr};
use critical_section::CriticalSection;
use embassy::blocking_mutex::raw::CriticalSectionRawMutex;
use embassy::blocking_mutex::CriticalSectionMutex as Mutex;
use embassy::interrupt::{Interrupt, InterruptExt};
use embassy::time::driver::{AlarmHandle, Driver};
@ -94,7 +95,7 @@ const ALARM_STATE_NEW: AlarmState = AlarmState::new();
embassy::time_driver_impl!(static DRIVER: RtcDriver = RtcDriver {
period: AtomicU32::new(0),
alarm_count: AtomicU8::new(0),
alarms: Mutex::new([ALARM_STATE_NEW; ALARM_COUNT]),
alarms: Mutex::const_new(CriticalSectionRawMutex::new(), [ALARM_STATE_NEW; ALARM_COUNT]),
});
impl RtcDriver {

9
embassy-nrf/src/twim.rs
View File

@ -679,7 +679,7 @@ mod eh1 {
fn transaction<'a>(
&mut self,
_address: u8,
_operations: &mut [embedded_hal_async::i2c::Operation<'a>],
_operations: &mut [embedded_hal_1::i2c::blocking::Operation<'a>],
) -> Result<(), Self::Error> {
todo!();
}
@ -690,13 +690,15 @@ mod eh1 {
_operations: O,
) -> Result<(), Self::Error>
where
O: IntoIterator<Item = embedded_hal_async::i2c::Operation<'a>>,
O: IntoIterator<Item = embedded_hal_1::i2c::blocking::Operation<'a>>,
{
todo!();
}
}
}
impl<'d, T: Instance> embedded_hal_async::i2c::I2c for Twim<'d, T> {
#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
impl<'d, T: Instance> embedded_hal_async::i2c::I2c for Twim<'d, T> {
type ReadFuture<'a>
where
Self: 'a,
@ -743,5 +745,4 @@ mod eh1 {
let _ = operations;
async move { todo!() }
}
}
}

61
embassy-nrf/src/uarte.rs
View File

@ -844,7 +844,6 @@ mod eh02 {
#[cfg(feature = "unstable-traits")]
mod eh1 {
use super::*;
use core::future::Future;
impl embedded_hal_1::serial::Error for Error {
fn kind(&self) -> embedded_hal_1::serial::ErrorKind {
@ -872,6 +871,36 @@ mod eh1 {
}
}
impl<'d, T: Instance> embedded_hal_1::serial::ErrorType for UarteTx<'d, T> {
type Error = Error;
}
impl<'d, T: Instance> embedded_hal_1::serial::blocking::Write for UarteTx<'d, T> {
fn write(&mut self, buffer: &[u8]) -> Result<(), Self::Error> {
self.blocking_write(buffer)
}
fn flush(&mut self) -> Result<(), Self::Error> {
Ok(())
}
}
impl<'d, T: Instance> embedded_hal_1::serial::ErrorType for UarteRx<'d, T> {
type Error = Error;
}
impl<'d, U: Instance, T: TimerInstance> embedded_hal_1::serial::ErrorType
for UarteWithIdle<'d, U, T>
{
type Error = Error;
}
}
#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
mod eh1a {
use super::*;
use core::future::Future;
impl<'d, T: Instance> embedded_hal_async::serial::Read for Uarte<'d, T> {
type ReadFuture<'a>
where
@ -903,22 +932,6 @@ mod eh1 {
}
}
// =====================
impl<'d, T: Instance> embedded_hal_1::serial::ErrorType for UarteTx<'d, T> {
type Error = Error;
}
impl<'d, T: Instance> embedded_hal_1::serial::blocking::Write for UarteTx<'d, T> {
fn write(&mut self, buffer: &[u8]) -> Result<(), Self::Error> {
self.blocking_write(buffer)
}
fn flush(&mut self) -> Result<(), Self::Error> {
Ok(())
}
}
impl<'d, T: Instance> embedded_hal_async::serial::Write for UarteTx<'d, T> {
type WriteFuture<'a>
where
@ -939,12 +952,6 @@ mod eh1 {
}
}
// =====================
impl<'d, T: Instance> embedded_hal_1::serial::ErrorType for UarteRx<'d, T> {
type Error = Error;
}
impl<'d, T: Instance> embedded_hal_async::serial::Read for UarteRx<'d, T> {
type ReadFuture<'a>
where
@ -956,14 +963,6 @@ mod eh1 {
}
}
// =====================
impl<'d, U: Instance, T: TimerInstance> embedded_hal_1::serial::ErrorType
for UarteWithIdle<'d, U, T>
{
type Error = Error;
}
impl<'d, U: Instance, T: TimerInstance> embedded_hal_async::serial::Read
for UarteWithIdle<'d, U, T>
{

2
embassy-rp/Cargo.toml
View File

@ -13,7 +13,7 @@ edition = "2018"
unstable-pac = []
[dependencies]
embassy = { version = "0.1.0", path = "../embassy", features = [ "time-tick-1mhz" ] }
embassy = { version = "0.1.0", path = "../embassy", features = [ "time-tick-1mhz", "nightly"] }
embassy-hal-common = {version = "0.1.0", path = "../embassy-hal-common" }
embassy-macros = { version = "0.1.0", path = "../embassy-macros", features = ["rp"]}
atomic-polyfill = "0.1.5"

7
embassy-rp/src/timer.rs
View File

@ -1,7 +1,8 @@
use atomic_polyfill::{AtomicU8, Ordering};
use core::cell::Cell;
use critical_section::CriticalSection;
use embassy::blocking_mutex::CriticalSectionMutex as Mutex;
use embassy::blocking_mutex::raw::CriticalSectionRawMutex;
use embassy::blocking_mutex::Mutex;
use embassy::interrupt::{Interrupt, InterruptExt};
use embassy::time::driver::{AlarmHandle, Driver};
@ -20,12 +21,12 @@ const DUMMY_ALARM: AlarmState = AlarmState {
};
struct TimerDriver {
alarms: Mutex<[AlarmState; ALARM_COUNT]>,
alarms: Mutex<CriticalSectionRawMutex, [AlarmState; ALARM_COUNT]>,
next_alarm: AtomicU8,
}
embassy::time_driver_impl!(static DRIVER: TimerDriver = TimerDriver{
alarms: Mutex::new([DUMMY_ALARM; ALARM_COUNT]),
alarms: Mutex::const_new(CriticalSectionRawMutex::new(), [DUMMY_ALARM; ALARM_COUNT]),
next_alarm: AtomicU8::new(0),
});

2
embassy-stm32/Cargo.toml
View File

@ -6,7 +6,7 @@ edition = "2018"
resolver = "2"
[dependencies]
embassy = { version = "0.1.0", path = "../embassy" }
embassy = { version = "0.1.0", path = "../embassy", features = ["nightly"]}
embassy-macros = { version = "0.1.0", path = "../embassy-macros", features = ["stm32"] }
embassy-hal-common = {version = "0.1.0", path = "../embassy-hal-common" }
embassy-net = { version = "0.1.0", path = "../embassy-net", default-features = false, optional = true }

8
embassy-stm32/src/time_driver.rs
View File

@ -3,13 +3,15 @@ use core::cell::Cell;
use core::convert::TryInto;
use core::sync::atomic::{compiler_fence, Ordering};
use core::{mem, ptr};
use embassy::blocking_mutex::raw::CriticalSectionRawMutex;
use embassy::blocking_mutex::Mutex;
use embassy::interrupt::InterruptExt;
use embassy::time::driver::{AlarmHandle, Driver};
use embassy::time::TICKS_PER_SECOND;
use stm32_metapac::timer::regs;
use crate::interrupt;
use crate::interrupt::{CriticalSection, Interrupt, Mutex};
use crate::interrupt::{CriticalSection, Interrupt};
use crate::pac::timer::{vals, TimGp16};
use crate::peripherals;
use crate::rcc::sealed::RccPeripheral;
@ -95,7 +97,7 @@ struct RtcDriver {
period: AtomicU32,
alarm_count: AtomicU8,
/// Timestamp at which to fire alarm. u64::MAX if no alarm is scheduled.
alarms: Mutex<[AlarmState; ALARM_COUNT]>,
alarms: Mutex<CriticalSectionRawMutex, [AlarmState; ALARM_COUNT]>,
}
const ALARM_STATE_NEW: AlarmState = AlarmState::new();
@ -103,7 +105,7 @@ const ALARM_STATE_NEW: AlarmState = AlarmState::new();
embassy::time_driver_impl!(static DRIVER: RtcDriver = RtcDriver {
period: AtomicU32::new(0),
alarm_count: AtomicU8::new(0),
alarms: Mutex::new([ALARM_STATE_NEW; ALARM_COUNT]),
alarms: Mutex::const_new(CriticalSectionRawMutex::new(), [ALARM_STATE_NEW; ALARM_COUNT]),
});
impl RtcDriver {

6
embassy/Cargo.toml
View File

@ -10,8 +10,12 @@ default = []
std = ["futures/std", "time", "time-tick-1mhz", "embassy-macros/std"]
wasm = ["wasm-bindgen", "js-sys", "embassy-macros/wasm", "wasm-timer", "time", "time-tick-1mhz"]
# Enable nightly-only features
nightly = ["embedded-hal-async"]
# Implement embedded-hal 1.0 alpha and embedded-hal-async traits.
unstable-traits = ["embedded-hal-1", "embedded-hal-async"]
# Implement embedded-hal-async traits if `nightly` is set as well.
unstable-traits = ["embedded-hal-1"]
# Enable `embassy::time` module.
# NOTE: This feature is only intended to be enabled by crates providing the time driver implementation.

20
embassy/src/blocking_mutex/kind.rs
View File

@ -1,20 +0,0 @@
pub trait MutexKind {
type Mutex<T>: super::Mutex<Data = T>;
}
pub enum CriticalSection {}
impl MutexKind for CriticalSection {
type Mutex<T> = super::CriticalSectionMutex<T>;
}
#[cfg(any(cortex_m, feature = "std"))]
pub enum ThreadMode {}
#[cfg(any(cortex_m, feature = "std"))]
impl MutexKind for ThreadMode {
type Mutex<T> = super::ThreadModeMutex<T>;
}
pub enum Noop {}
impl MutexKind for Noop {
type Mutex<T> = super::NoopMutex<T>;
}

194
embassy/src/blocking_mutex/mod.rs
View File

@ -1,67 +1,107 @@
//! Blocking mutex (not async)
pub mod kind;
pub mod raw;
use self::raw::RawMutex;
use core::cell::UnsafeCell;
use critical_section::CriticalSection;
/// Any object implementing this trait guarantees exclusive access to the data contained
/// within the mutex for the duration of the lock.
/// Adapted from <https://github.com/rust-embedded/mutex-trait>.
pub trait Mutex {
/// Data protected by the mutex.
type Data;
pub struct Mutex<R, T: ?Sized> {
// NOTE: `raw` must be FIRST, so when using ThreadModeMutex the "can't drop in non-thread-mode" gets
// to run BEFORE dropping `data`.
raw: R,
data: UnsafeCell<T>,
}
fn new(data: Self::Data) -> Self;
unsafe impl<R: RawMutex + Send, T: ?Sized + Send> Send for Mutex<R, T> {}
unsafe impl<R: RawMutex + Sync, T: ?Sized + Send> Sync for Mutex<R, T> {}
impl<R: RawMutex, T> Mutex<R, T> {
/// Creates a new mutex in an unlocked state ready for use.
#[cfg(feature = "nightly")]
#[inline]
pub const fn new(val: T) -> Mutex<R, T> {
Mutex {
raw: R::INIT,
data: UnsafeCell::new(val),
}
}
/// Creates a new mutex in an unlocked state ready for use.
#[cfg(not(feature = "nightly"))]
#[inline]
pub fn new(val: T) -> Mutex<R, T> {
Mutex {
raw: R::INIT,
data: UnsafeCell::new(val),
}
}
/// Creates a critical section and grants temporary access to the protected data.
fn lock<R>(&self, f: impl FnOnce(&Self::Data) -> R) -> R;
}
/// A "mutex" based on critical sections
///
/// # Safety
///
/// **This Mutex is only safe on single-core systems.**
///
/// On multi-core systems, a `CriticalSection` **is not sufficient** to ensure exclusive access.
pub struct CriticalSectionMutex<T> {
inner: UnsafeCell<T>,
}
// NOTE: A `CriticalSectionMutex` can be used as a channel so the protected data must be `Send`
// to prevent sending non-Sendable stuff (e.g. access tokens) across different
// execution contexts (e.g. interrupts)
unsafe impl<T> Sync for CriticalSectionMutex<T> where T: Send {}
impl<T> CriticalSectionMutex<T> {
/// Creates a new mutex
pub const fn new(value: T) -> Self {
CriticalSectionMutex {
inner: UnsafeCell::new(value),
}
pub fn lock<U>(&self, f: impl FnOnce(&T) -> U) -> U {
self.raw.lock(|| {
let ptr = self.data.get() as *const T;
let inner = unsafe { &*ptr };
f(inner)
})
}
}
impl<T> CriticalSectionMutex<T> {
impl<R, T> Mutex<R, T> {
/// Creates a new mutex based on a pre-existing raw mutex.
///
/// This allows creating a mutex in a constant context on stable Rust.
#[inline]
pub const fn const_new(raw_mutex: R, val: T) -> Mutex<R, T> {
Mutex {
raw: raw_mutex,
data: UnsafeCell::new(val),
}
}
/// Consumes this mutex, returning the underlying data.
#[inline]
pub fn into_inner(self) -> T {
self.data.into_inner()
}
/// Returns a mutable reference to the underlying data.
///
/// Since this call borrows the `Mutex` mutably, no actual locking needs to
/// take place---the mutable borrow statically guarantees no locks exist.
#[inline]
pub fn get_mut(&mut self) -> &mut T {
unsafe { &mut *self.data.get() }
}
}
pub type CriticalSectionMutex<T> = Mutex<raw::CriticalSectionRawMutex, T>;
pub type NoopMutex<T> = Mutex<raw::NoopRawMutex, T>;
impl<T> Mutex<raw::CriticalSectionRawMutex, T> {
/// Borrows the data for the duration of the critical section
pub fn borrow<'cs>(&'cs self, _cs: CriticalSection<'cs>) -> &'cs T {
unsafe { &*self.inner.get() }
pub fn borrow<'cs>(&'cs self, _cs: critical_section::CriticalSection<'cs>) -> &'cs T {
let ptr = self.data.get() as *const T;
unsafe { &*ptr }
}
}
impl<T> Mutex for CriticalSectionMutex<T> {
type Data = T;
fn new(data: T) -> Self {
Self::new(data)
}
fn lock<R>(&self, f: impl FnOnce(&Self::Data) -> R) -> R {
critical_section::with(|cs| f(self.borrow(cs)))
impl<T> Mutex<raw::NoopRawMutex, T> {
/// Borrows the data
pub fn borrow(&self) -> &T {
let ptr = self.data.get() as *const T;
unsafe { &*ptr }
}
}
// ThreadModeMutex does NOT use the generic mutex from above because it's special:
// it's Send+Sync even if T: !Send. There's no way to do that without specialization (I think?).
//
// There's still a ThreadModeRawMutex for use with the generic Mutex (handy with Channel, for example),
// but that will require T: Send even though it shouldn't be needed.
#[cfg(any(cortex_m, feature = "std"))]
pub use thread_mode_mutex::*;
#[cfg(any(cortex_m, feature = "std"))]
@ -75,15 +115,15 @@ mod thread_mode_mutex {
/// **This Mutex is only safe on single-core systems.**
///
/// On multi-core systems, a `ThreadModeMutex` **is not sufficient** to ensure exclusive access.
pub struct ThreadModeMutex<T> {
pub struct ThreadModeMutex<T: ?Sized> {
inner: UnsafeCell<T>,
}
// NOTE: ThreadModeMutex only allows borrowing from one execution context ever: thread mode.
// Therefore it cannot be used to send non-sendable stuff between execution contexts, so it can
// be Send+Sync even if T is not Send (unlike CriticalSectionMutex)
unsafe impl<T> Sync for ThreadModeMutex<T> {}
unsafe impl<T> Send for ThreadModeMutex<T> {}
unsafe impl<T: ?Sized> Sync for ThreadModeMutex<T> {}
unsafe impl<T: ?Sized> Send for ThreadModeMutex<T> {}
impl<T> ThreadModeMutex<T> {
/// Creates a new mutex
@ -92,79 +132,35 @@ mod thread_mode_mutex {
inner: UnsafeCell::new(value),
}
}
}
impl<T: ?Sized> ThreadModeMutex<T> {
pub fn lock<R>(&self, f: impl FnOnce(&T) -> R) -> R {
f(self.borrow())
}
/// Borrows the data
pub fn borrow(&self) -> &T {
assert!(
in_thread_mode(),
raw::in_thread_mode(),
"ThreadModeMutex can only be borrowed from thread mode."
);
unsafe { &*self.inner.get() }
}
}
impl<T> Mutex for ThreadModeMutex<T> {
type Data = T;
fn new(data: T) -> Self {
Self::new(data)
}
fn lock<R>(&self, f: impl FnOnce(&Self::Data) -> R) -> R {
f(self.borrow())
}
}
impl<T> Drop for ThreadModeMutex<T> {
impl<T: ?Sized> Drop for ThreadModeMutex<T> {
fn drop(&mut self) {
// Only allow dropping from thread mode. Dropping calls drop on the inner `T`, so
// `drop` needs the same guarantees as `lock`. `ThreadModeMutex<T>` is Send even if
// T isn't, so without this check a user could create a ThreadModeMutex in thread mode,
// send it to interrupt context and drop it there, which would "send" a T even if T is not Send.
assert!(
in_thread_mode(),
raw::in_thread_mode(),
"ThreadModeMutex can only be dropped from thread mode."
);
// Drop of the inner `T` happens after this.
}
}
pub fn in_thread_mode() -> bool {
#[cfg(feature = "std")]
return Some("main") == std::thread::current().name();
#[cfg(not(feature = "std"))]
return cortex_m::peripheral::SCB::vect_active()
== cortex_m::peripheral::scb::VectActive::ThreadMode;
}
}
/// A "mutex" that does nothing and cannot be shared between threads.
pub struct NoopMutex<T> {
inner: T,
}
impl<T> NoopMutex<T> {
pub const fn new(value: T) -> Self {
NoopMutex { inner: value }
}
}
impl<T> NoopMutex<T> {
pub fn borrow(&self) -> &T {
&self.inner
}
}
impl<T> Mutex for NoopMutex<T> {
type Data = T;
fn new(data: T) -> Self {
Self::new(data)
}
fn lock<R>(&self, f: impl FnOnce(&Self::Data) -> R) -> R {
f(self.borrow())
}
}

112
embassy/src/blocking_mutex/raw.rs Normal file
View File

@ -0,0 +1,112 @@
use core::marker::PhantomData;
pub trait RawMutex {
const INIT: Self;
fn lock<R>(&self, f: impl FnOnce() -> R) -> R;
}
pub struct CriticalSectionRawMutex {
_phantom: PhantomData<()>,
}
unsafe impl Send for CriticalSectionRawMutex {}
unsafe impl Sync for CriticalSectionRawMutex {}
impl CriticalSectionRawMutex {
pub const fn new() -> Self {
Self {
_phantom: PhantomData,
}
}
}
impl RawMutex for CriticalSectionRawMutex {
const INIT: Self = Self::new();
fn lock<R>(&self, f: impl FnOnce() -> R) -> R {
critical_section::with(|_| f())
}
}
// ================
pub struct NoopRawMutex {
_phantom: PhantomData<*mut ()>,
}
unsafe impl Send for NoopRawMutex {}
impl NoopRawMutex {
pub const fn new() -> Self {
Self {
_phantom: PhantomData,
}
}
}
impl RawMutex for NoopRawMutex {
const INIT: Self = Self::new();
fn lock<R>(&self, f: impl FnOnce() -> R) -> R {
f()
}
}
// ================
#[cfg(any(cortex_m, feature = "std"))]
mod thread_mode {
use super::*;
pub struct ThreadModeRawMutex {
_phantom: PhantomData<()>,
}
unsafe impl Send for ThreadModeRawMutex {}
unsafe impl Sync for ThreadModeRawMutex {}
impl ThreadModeRawMutex {
pub const fn new() -> Self {
Self {
_phantom: PhantomData,
}
}
}
impl RawMutex for ThreadModeRawMutex {
const INIT: Self = Self::new();
fn lock<R>(&self, f: impl FnOnce() -> R) -> R {
assert!(
in_thread_mode(),
"ThreadModeMutex can only be locked from thread mode."
);
f()
}
}
impl Drop for ThreadModeRawMutex {
fn drop(&mut self) {
// Only allow dropping from thread mode. Dropping calls drop on the inner `T`, so
// `drop` needs the same guarantees as `lock`. `ThreadModeMutex<T>` is Send even if
// T isn't, so without this check a user could create a ThreadModeMutex in thread mode,
// send it to interrupt context and drop it there, which would "send" a T even if T is not Send.
assert!(
in_thread_mode(),
"ThreadModeMutex can only be dropped from thread mode."
);
// Drop of the inner `T` happens after this.
}
}
pub(crate) fn in_thread_mode() -> bool {
#[cfg(feature = "std")]
return Some("main") == std::thread::current().name();
#[cfg(not(feature = "std"))]
return cortex_m::peripheral::SCB::vect_active()
== cortex_m::peripheral::scb::VectActive::ThreadMode;
}
}
#[cfg(any(cortex_m, feature = "std"))]
pub use thread_mode::*;

90
embassy/src/channel/mpsc.rs
View File

@ -47,7 +47,7 @@ use core::task::Waker;
use futures::Future;
use heapless::Deque;
use crate::blocking_mutex::kind::MutexKind;
use crate::blocking_mutex::raw::RawMutex;
use crate::blocking_mutex::Mutex;
use crate::waitqueue::WakerRegistration;
@ -56,7 +56,7 @@ use crate::waitqueue::WakerRegistration;
/// Instances are created by the [`split`](split) function.
pub struct Sender<'ch, M, T, const N: usize>
where
M: MutexKind,
M: RawMutex,
{
channel: &'ch Channel<M, T, N>,
}
@ -66,7 +66,7 @@ where
/// Instances are created by the [`split`](split) function.
pub struct Receiver<'ch, M, T, const N: usize>
where
M: MutexKind,
M: RawMutex,
{
channel: &'ch Channel<M, T, N>,
}
@ -99,7 +99,7 @@ pub fn split<M, T, const N: usize>(
channel: &mut Channel<M, T, N>,
) -> (Sender<M, T, N>, Receiver<M, T, N>)
where
M: MutexKind,
M: RawMutex,
{
let sender = Sender { channel };
let receiver = Receiver { channel };
@ -112,7 +112,7 @@ where
impl<'ch, M, T, const N: usize> Receiver<'ch, M, T, N>
where
M: MutexKind,
M: RawMutex,
{
/// Receives the next value for this receiver.
///
@ -161,7 +161,7 @@ where
impl<'ch, M, T, const N: usize> Drop for Receiver<'ch, M, T, N>
where
M: MutexKind,
M: RawMutex,
{
fn drop(&mut self) {
self.channel.lock(|c| c.deregister_receiver())
@ -170,14 +170,14 @@ where
pub struct RecvFuture<'ch, M, T, const N: usize>
where
M: MutexKind,
M: RawMutex,
{
channel: &'ch Channel<M, T, N>,
}
impl<'ch, M, T, const N: usize> Future for RecvFuture<'ch, M, T, N>
where
M: MutexKind,
M: RawMutex,
{
type Output = Option<T>;
@ -193,7 +193,7 @@ where
impl<'ch, M, T, const N: usize> Sender<'ch, M, T, N>
where
M: MutexKind,
M: RawMutex,
{
/// Sends a value, waiting until there is capacity.
///
@ -268,7 +268,7 @@ where
pub struct SendFuture<'ch, M, T, const N: usize>
where
M: MutexKind,
M: RawMutex,
{
channel: &'ch Channel<M, T, N>,
message: Option<T>,
@ -276,7 +276,7 @@ where
impl<'ch, M, T, const N: usize> Future for SendFuture<'ch, M, T, N>
where
M: MutexKind,
M: RawMutex,
{
type Output = Result<(), SendError<T>>;
@ -295,18 +295,18 @@ where
}
}
impl<'ch, M, T, const N: usize> Unpin for SendFuture<'ch, M, T, N> where M: MutexKind {}
impl<'ch, M, T, const N: usize> Unpin for SendFuture<'ch, M, T, N> where M: RawMutex {}
struct CloseFuture<'ch, M, T, const N: usize>
where
M: MutexKind,
M: RawMutex,
{
channel: &'ch Channel<M, T, N>,
}
impl<'ch, M, T, const N: usize> Future for CloseFuture<'ch, M, T, N>
where
M: MutexKind,
M: RawMutex,
{
type Output = ();
@ -321,7 +321,7 @@ where
impl<'ch, M, T, const N: usize> Drop for Sender<'ch, M, T, N>
where
M: MutexKind,
M: RawMutex,
{
fn drop(&mut self) {
self.channel.lock(|c| c.deregister_sender())
@ -330,7 +330,7 @@ where
impl<'ch, M, T, const N: usize> Clone for Sender<'ch, M, T, N>
where
M: MutexKind,
M: RawMutex,
{
fn clone(&self) -> Self {
self.channel.lock(|c| c.register_sender());
@ -546,30 +546,50 @@ impl<T, const N: usize> ChannelState<T, N> {
/// All data sent will become available in the same order as it was sent.
pub struct Channel<M, T, const N: usize>
where
M: MutexKind,
M: RawMutex,
{
inner: M::Mutex<RefCell<ChannelState<T, N>>>,
inner: Mutex<M, RefCell<ChannelState<T, N>>>,
}
impl<M, T, const N: usize> Channel<M, T, N>
where
M: MutexKind,
M: RawMutex,
{
/// Establish a new bounded channel. For example, to create one with a NoopMutex:
///
/// ```
/// use embassy::channel::mpsc;
/// use embassy::blocking_mutex::kind::Noop;
/// use embassy::blocking_mutex::raw::NoopRawMutex;
/// use embassy::channel::mpsc::Channel;
///
/// // Declare a bounded channel of 3 u32s.
/// let mut channel = Channel::<Noop, u32, 3>::new();
/// let mut channel = Channel::<NoopRawMutex, u32, 3>::new();
/// // once we have a channel, obtain its sender and receiver
/// let (sender, receiver) = mpsc::split(&mut channel);
/// ```
#[cfg(feature = "nightly")]
pub const fn new() -> Self {
Self {
inner: Mutex::new(RefCell::new(ChannelState::new())),
}
}
/// Establish a new bounded channel. For example, to create one with a NoopMutex:
///
/// ```
/// use embassy::channel::mpsc;
/// use embassy::blocking_mutex::raw::NoopRawMutex;
/// use embassy::channel::mpsc::Channel;
///
/// // Declare a bounded channel of 3 u32s.
/// let mut channel = Channel::<NoopRawMutex, u32, 3>::new();
/// // once we have a channel, obtain its sender and receiver
/// let (sender, receiver) = mpsc::split(&mut channel);
/// ```
#[cfg(not(feature = "nightly"))]
pub fn new() -> Self {
Self {
inner: M::Mutex::new(RefCell::new(ChannelState::new())),
inner: Mutex::new(RefCell::new(ChannelState::new())),
}
}
@ -586,7 +606,7 @@ mod tests {
use futures_executor::ThreadPool;
use futures_timer::Delay;
use crate::blocking_mutex::kind::{CriticalSection, Noop};
use crate::blocking_mutex::raw::{CriticalSectionRawMutex, NoopRawMutex};
use crate::util::Forever;
use super::*;
@ -655,7 +675,7 @@ mod tests {
#[test]
fn simple_send_and_receive() {
let mut c = Channel::<Noop, u32, 3>::new();
let mut c = Channel::<NoopRawMutex, u32, 3>::new();
let (s, r) = split(&mut c);
assert!(s.clone().try_send(1).is_ok());
assert_eq!(r.try_recv().unwrap(), 1);
@ -663,7 +683,7 @@ mod tests {
#[test]
fn should_close_without_sender() {
let mut c = Channel::<Noop, u32, 3>::new();
let mut c = Channel::<NoopRawMutex, u32, 3>::new();
let (s, r) = split(&mut c);
drop(s);
match r.try_recv() {
@ -674,7 +694,7 @@ mod tests {
#[test]
fn should_close_once_drained() {
let mut c = Channel::<Noop, u32, 3>::new();
let mut c = Channel::<NoopRawMutex, u32, 3>::new();
let (s, r) = split(&mut c);
assert!(s.try_send(1).is_ok());
drop(s);
@ -687,7 +707,7 @@ mod tests {
#[test]
fn should_reject_send_when_receiver_dropped() {
let mut c = Channel::<Noop, u32, 3>::new();
let mut c = Channel::<NoopRawMutex, u32, 3>::new();
let (s, r) = split(&mut c);
drop(r);
match s.try_send(1) {
@ -698,7 +718,7 @@ mod tests {
#[test]
fn should_reject_send_when_channel_closed() {
let mut c = Channel::<Noop, u32, 3>::new();
let mut c = Channel::<NoopRawMutex, u32, 3>::new();
let (s, mut r) = split(&mut c);
assert!(s.try_send(1).is_ok());
r.close();
@ -714,7 +734,7 @@ mod tests {
async fn receiver_closes_when_sender_dropped_async() {
let executor = ThreadPool::new().unwrap();
static CHANNEL: Forever<Channel<CriticalSection, u32, 3>> = Forever::new();
static CHANNEL: Forever<Channel<CriticalSectionRawMutex, u32, 3>> = Forever::new();
let c = CHANNEL.put(Channel::new());
let (s, mut r) = split(c);
assert!(executor
@ -729,7 +749,7 @@ mod tests {
async fn receiver_receives_given_try_send_async() {
let executor = ThreadPool::new().unwrap();
static CHANNEL: Forever<Channel<CriticalSection, u32, 3>> = Forever::new();
static CHANNEL: Forever<Channel<CriticalSectionRawMutex, u32, 3>> = Forever::new();
let c = CHANNEL.put(Channel::new());
let (s, mut r) = split(c);
assert!(executor
@ -742,7 +762,7 @@ mod tests {
#[futures_test::test]
async fn sender_send_completes_if_capacity() {
let mut c = Channel::<CriticalSection, u32, 1>::new();
let mut c = Channel::<CriticalSectionRawMutex, u32, 1>::new();
let (s, mut r) = split(&mut c);
assert!(s.send(1).await.is_ok());
assert_eq!(r.recv().await, Some(1));
@ -750,7 +770,7 @@ mod tests {
#[futures_test::test]
async fn sender_send_completes_if_closed() {
static CHANNEL: Forever<Channel<CriticalSection, u32, 1>> = Forever::new();
static CHANNEL: Forever<Channel<CriticalSectionRawMutex, u32, 1>> = Forever::new();
let c = CHANNEL.put(Channel::new());
let (s, r) = split(c);
drop(r);
@ -764,7 +784,7 @@ mod tests {
async fn senders_sends_wait_until_capacity() {
let executor = ThreadPool::new().unwrap();
static CHANNEL: Forever<Channel<CriticalSection, u32, 1>> = Forever::new();
static CHANNEL: Forever<Channel<CriticalSectionRawMutex, u32, 1>> = Forever::new();
let c = CHANNEL.put(Channel::new());
let (s0, mut r) = split(c);
assert!(s0.try_send(1).is_ok());
@ -784,7 +804,7 @@ mod tests {
#[futures_test::test]
async fn sender_close_completes_if_closing() {
static CHANNEL: Forever<Channel<CriticalSection, u32, 1>> = Forever::new();
static CHANNEL: Forever<Channel<CriticalSectionRawMutex, u32, 1>> = Forever::new();
let c = CHANNEL.put(Channel::new());
let (s, mut r) = split(c);
r.close();
@ -793,7 +813,7 @@ mod tests {
#[futures_test::test]
async fn sender_close_completes_if_closed() {
static CHANNEL: Forever<Channel<CriticalSection, u32, 1>> = Forever::new();
static CHANNEL: Forever<Channel<CriticalSectionRawMutex, u32, 1>> = Forever::new();
let c = CHANNEL.put(Channel::new());
let (s, r) = split(c);
drop(r);

4
embassy/src/channel/signal.rs
View File

@ -32,13 +32,15 @@ enum State<T> {
unsafe impl<T: Send> Send for Signal<T> {}
unsafe impl<T: Send> Sync for Signal<T> {}
impl<T: Send> Signal<T> {
impl<T> Signal<T> {
pub const fn new() -> Self {
Self {
state: UnsafeCell::new(State::None),
}
}
}
impl<T: Send> Signal<T> {
/// Mark this Signal as completed.
pub fn signal(&self, val: T) {
critical_section::with(|_| unsafe {

28
embassy/src/executor/raw/mod.rs
View File

@ -57,6 +57,7 @@ pub struct TaskHeader {
}
impl TaskHeader {
#[cfg(feature = "nightly")]
pub(crate) const fn new() -> Self {
Self {
state: AtomicU32::new(0),
@ -71,6 +72,21 @@ impl TaskHeader {
}
}
#[cfg(not(feature = "nightly"))]
pub(crate) fn new() -> Self {
Self {
state: AtomicU32::new(0),
run_queue_item: RunQueueItem::new(),
executor: Cell::new(ptr::null()),
poll_fn: UninitCell::uninit(),
#[cfg(feature = "time")]
expires_at: Cell::new(Instant::from_ticks(0)),
#[cfg(feature = "time")]
timer_queue_item: timer_queue::TimerQueueItem::new(),
}
}
pub(crate) unsafe fn enqueue(&self) {
critical_section::with(|cs| {
let state = self.state.load(Ordering::Relaxed);
@ -113,7 +129,8 @@ pub struct TaskStorage<F: Future + 'static> {
}
impl<F: Future + 'static> TaskStorage<F> {
/// Create a new Task, in not-spawned state.
/// Create a new TaskStorage, in not-spawned state.
#[cfg(feature = "nightly")]
pub const fn new() -> Self {
Self {
raw: TaskHeader::new(),
@ -121,6 +138,15 @@ impl<F: Future + 'static> TaskStorage<F> {
}
}
/// Create a new TaskStorage, in not-spawned state.
#[cfg(not(feature = "nightly"))]
pub fn new() -> Self {
Self {
raw: TaskHeader::new(),
future: UninitCell::uninit(),
}
}
/// Try to spawn a task in a pool.
///
/// See [`Self::spawn()`] for details.

16
embassy/src/lib.rs
View File

@ -1,8 +1,13 @@
#![cfg_attr(not(any(feature = "std", feature = "wasm")), no_std)]
#![feature(generic_associated_types)]
#![feature(const_fn_trait_bound)]
#![feature(const_fn_fn_ptr_basics)]
#![feature(type_alias_impl_trait)]
#![cfg_attr(
feature = "nightly",
feature(
const_fn_trait_bound,
const_fn_fn_ptr_basics,
generic_associated_types,
type_alias_impl_trait
)
)]
#![allow(clippy::new_without_default)]
// This mod MUST go first, so that the others see its macros.
@ -20,7 +25,8 @@ pub mod io;
pub mod time;
pub mod util;
pub use embassy_macros::*;
#[cfg(feature = "nightly")]
pub use embassy_macros::{main, task};
#[doc(hidden)]
/// Implementation details for embassy macros. DO NOT USE.

12
embassy/src/time/delay.rs
View File

@ -16,11 +16,7 @@ pub struct Delay;
#[cfg(feature = "unstable-traits")]
mod eh1 {
use core::future::Future;
use futures::FutureExt;
use super::*;
use crate::time::Timer;
impl embedded_hal_1::delay::blocking::DelayUs for Delay {
type Error = core::convert::Infallible;
@ -33,6 +29,14 @@ mod eh1 {
Ok(block_for(Duration::from_millis(ms as u64)))
}
}
}
#[cfg(all(feature = "unstable-traits", feature = "nightly"))]
mod eh1a {
use super::*;
use crate::time::Timer;
use core::future::Future;
use futures::FutureExt;
impl embedded_hal_async::delay::DelayUs for Delay {
type Error = core::convert::Infallible;

7
embassy/src/waitqueue/waker_agnostic.rs
View File

@ -2,7 +2,8 @@ use core::cell::Cell;
use core::mem;
use core::task::Waker;
use crate::blocking_mutex::CriticalSectionMutex as Mutex;
use crate::blocking_mutex::raw::CriticalSectionRawMutex;
use crate::blocking_mutex::Mutex;
/// Utility struct to register and wake a waker.
#[derive(Debug)]
@ -50,13 +51,13 @@ impl WakerRegistration {
/// Utility struct to register and wake a waker.
pub struct AtomicWaker {
waker: Mutex<Cell<Option<Waker>>>,
waker: Mutex<CriticalSectionRawMutex, Cell<Option<Waker>>>,
}
impl AtomicWaker {
pub const fn new() -> Self {
Self {
waker: Mutex::new(Cell::new(None)),
waker: Mutex::const_new(CriticalSectionRawMutex::new(), Cell::new(None)),
}
}

3
examples/nrf/Cargo.toml
View File

@ -4,6 +4,9 @@ edition = "2018"
name = "embassy-nrf-examples"
version = "0.1.0"
[features]
default = ["nightly"]
nightly = ["embassy-nrf/nightly"]
[dependencies]
embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt"] }

6
examples/nrf/src/bin/mpsc.rs
View File

@ -6,7 +6,7 @@
mod example_common;
use defmt::unwrap;
use embassy::blocking_mutex::kind::Noop;
use embassy::blocking_mutex::raw::NoopRawMutex;
use embassy::channel::mpsc::{self, Channel, Sender, TryRecvError};
use embassy::executor::Spawner;
use embassy::time::{Duration, Timer};
@ -19,10 +19,10 @@ enum LedState {
Off,
}
static CHANNEL: Forever<Channel<Noop, LedState, 1>> = Forever::new();
static CHANNEL: Forever<Channel<NoopRawMutex, LedState, 1>> = Forever::new();
#[embassy::task(pool_size = 1)]
async fn my_task(sender: Sender<'static, Noop, LedState, 1>) {
async fn my_task(sender: Sender<'static, NoopRawMutex, LedState, 1>) {
loop {
let _ = sender.send(LedState::On).await;
Timer::after(Duration::from_secs(1)).await;

6
examples/nrf/src/bin/uart_split.rs
View File

@ -6,7 +6,7 @@
mod example_common;
use example_common::*;
use embassy::blocking_mutex::kind::Noop;
use embassy::blocking_mutex::raw::NoopRawMutex;
use embassy::channel::mpsc::{self, Channel, Sender};
use embassy::executor::Spawner;
use embassy::util::Forever;
@ -14,7 +14,7 @@ use embassy_nrf::peripherals::UARTE0;
use embassy_nrf::uarte::UarteRx;
use embassy_nrf::{interrupt, uarte, Peripherals};
static CHANNEL: Forever<Channel<Noop, [u8; 8], 1>> = Forever::new();
static CHANNEL: Forever<Channel<NoopRawMutex, [u8; 8], 1>> = Forever::new();
#[embassy::main]
async fn main(spawner: Spawner, p: Peripherals) {
@ -56,7 +56,7 @@ async fn main(spawner: Spawner, p: Peripherals) {
}
#[embassy::task]
async fn reader(mut rx: UarteRx<'static, UARTE0>, s: Sender<'static, Noop, [u8; 8], 1>) {
async fn reader(mut rx: UarteRx<'static, UARTE0>, s: Sender<'static, NoopRawMutex, [u8; 8], 1>) {
let mut buf = [0; 8];
loop {
info!("reading...");

2
examples/std/Cargo.toml
View File

@ -5,7 +5,7 @@ name = "embassy-std-examples"
version = "0.1.0"
[dependencies]
embassy = { version = "0.1.0", path = "../../embassy", features = ["log", "std", "time"] }
embassy = { version = "0.1.0", path = "../../embassy", features = ["log", "std", "time", "nightly"] }
embassy-net = { version = "0.1.0", path = "../../embassy-net", features=["std", "log", "medium-ethernet", "tcp", "dhcpv4"] }
async-io = "1.6.0"

11
examples/stm32f3/src/bin/button_events.rs
View File

@ -12,7 +12,7 @@
#[path = "../example_common.rs"]
mod example_common;
use embassy::blocking_mutex::kind::Noop;
use embassy::blocking_mutex::raw::NoopRawMutex;
use embassy::channel::mpsc::{self, Channel, Receiver, Sender};
use embassy::executor::Spawner;
use embassy::time::{with_timeout, Duration, Timer};
@ -77,7 +77,7 @@ enum ButtonEvent {
Hold,
}
static BUTTON_EVENTS_QUEUE: Forever<Channel<Noop, ButtonEvent, 4>> = Forever::new();
static BUTTON_EVENTS_QUEUE: Forever<Channel<NoopRawMutex, ButtonEvent, 4>> = Forever::new();
#[embassy::main]
async fn main(spawner: Spawner, p: Peripherals) {
@ -103,7 +103,10 @@ async fn main(spawner: Spawner, p: Peripherals) {
}
#[embassy::task]
async fn led_blinker(mut leds: Leds<'static>, queue: Receiver<'static, Noop, ButtonEvent, 4>) {
async fn led_blinker(
mut leds: Leds<'static>,
queue: Receiver<'static, NoopRawMutex, ButtonEvent, 4>,
) {
loop {
leds.blink().await;
match queue.try_recv() {
@ -121,7 +124,7 @@ async fn led_blinker(mut leds: Leds<'static>, queue: Receiver<'static, Noop, But
#[embassy::task]
async fn button_waiter(
mut button: ExtiInput<'static, PA0>,
queue: Sender<'static, Noop, ButtonEvent, 4>,
queue: Sender<'static, NoopRawMutex, ButtonEvent, 4>,
) {
const DOUBLE_CLICK_DELAY: u64 = 250;
const HOLD_DELAY: u64 = 1000;

2
examples/wasm/Cargo.toml
View File

@ -8,7 +8,7 @@ version = "0.1.0"
crate-type = ["cdylib"]
[dependencies]
embassy = { version = "0.1.0", path = "../../embassy", features = ["log", "wasm"] }
embassy = { version = "0.1.0", path = "../../embassy", features = ["log", "wasm", "nightly"] }
wasm-logger = "0.2.0"
wasm-bindgen = "0.2"