diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3a4ed8f536..164c538e98 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -180,6 +180,35 @@ jobs:
if: ${{ matrix.backend != 'riscv32-imc-clint' }}
run: cargo xtask --platform hifive1 --backend ${{ matrix.backend }} example-check
+ # Platform esp32c3: verify all examples, checks
+ checkexamplesesp32c3:
+ name: check examples (esp32c3)
+ runs-on: ubuntu-22.04
+ strategy:
+ matrix:
+ backend:
+ - riscv-esp32-c3
+ toolchain:
+ - nightly
+ steps:
+ - name: Checkout
+ uses: actions/checkout@v4
+
+ - name: Install Rust ${{ matrix.toolchain }}
+ run: |
+ rustup toolchain install nightly-2023-11-14 --component rust-src --target riscv32imc-unknown-none-elf
+
+ - name: Configure Rust target
+ run: |
+ rustup target add riscv32imc-unknown-none-elf
+
+ - name: Cache Dependencies
+ uses: Swatinem/rust-cache@v2
+
+ - name: Check the examples
+ run: cargo xtask --platform esp32-c3 --backend ${{ matrix.backend }} example-check
+
+
buildqemu:
name: Get modern QEMU, build and store
runs-on: ubuntu-22.04
@@ -797,6 +826,7 @@ jobs:
# clippyhifive1 TODO
- checkexampleslm3s6965
- checkexampleshifive1
+ - checkexamplesesp32c3
- testexampleslm3s6965
- testexampleshifive1
- tests
diff --git a/examples/esp32c3/.cargo/config.toml b/examples/esp32c3/.cargo/config.toml
new file mode 100644
index 0000000000..fb52d86782
--- /dev/null
+++ b/examples/esp32c3/.cargo/config.toml
@@ -0,0 +1,15 @@
+[target.riscv32imc-unknown-none-elf]
+runner = "espflash flash --monitor"
+
+[build]
+rustflags = [
+ "-C", "link-arg=-Tlinkall.x",
+ # Required to obtain backtraces (e.g. when using the "esp-backtrace" crate.)
+ # NOTE: May negatively impact performance of produced code
+ "-C", "force-frame-pointers",
+]
+
+target = "riscv32imc-unknown-none-elf"
+
+[unstable]
+build-std = ["core"]
diff --git a/examples/esp32c3/Cargo.lock b/examples/esp32c3/Cargo.lock
new file mode 100644
index 0000000000..7e6d0d0e21
--- /dev/null
+++ b/examples/esp32c3/Cargo.lock
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+ "minijinja",
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diff --git a/examples/esp32c3/Cargo.toml b/examples/esp32c3/Cargo.toml
new file mode 100644
index 0000000000..9a4e813c19
--- /dev/null
+++ b/examples/esp32c3/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "esp32-c3"
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+
+[workspace]
+
+[dependencies]
+rtic = {path = "../../rtic/"}
+esp-hal = { version = "0.16.1", features = ["esp32c3", "direct-vectoring", "interrupt-preemption"] }
+esp-backtrace = { version = "0.11.0", features = [
+ "esp32c3",
+ "panic-handler",
+ "exception-handler",
+ "println",
+] }
+
+esp32c3 = {version = "0.21.0", features = ["critical-section"]}
+esp-println = { version = "0.9.0", features = ["esp32c3", "uart"] }
+
+[features]
+test-critical-section = []
+riscv-esp32c3-backend = ["rtic/riscv-esp32c3-backend"]
diff --git a/examples/esp32c3/README.md b/examples/esp32c3/README.md
new file mode 100644
index 0000000000..37d0167fb1
--- /dev/null
+++ b/examples/esp32c3/README.md
@@ -0,0 +1,33 @@
+### ESP32-C3 RTIC template
+This crate showcases a simple RTIC application for the ESP32-C3.
+
+## Prerequisites
+
+# Nightly Rust
+The ESP32-C3 HAL requires a nightly build of Rust.
+Following the example of the (Espressif no_std book)[https://docs.esp-rs.org/no_std-training/02_2_software.html], we use this specific build:
+```rustup toolchain install nightly-2023-11-14 --component rust-src --target riscv32imc-unknown-none-elf```
+
+# Espressif toolchain
+
+This crate uses the most convenient option in ``cargo-espflash`` and ``espflash``
+```cargo install cargo-espflash espflash```
+
+## Running the crate
+
+```cargo run --example sw_and_hw --features=riscv-esp32c3-backend (--release)```
+
+should do the trick.
+
+# Expected behavior
+The program
+- Prints ``init``
+- Enters a high prio task
+- During the execution of the high prio task, the button should be non-functional
+- Pends a low prio task
+- Exits the high prio task
+- Enters the low prio task
+- During the execution of the low prio task, the button should be functional.
+- Exits the low prio task
+- Prints ``idle``
+
diff --git a/examples/esp32c3/examples/sw_and_hw.rs b/examples/esp32c3/examples/sw_and_hw.rs
new file mode 100644
index 0000000000..413df92b18
--- /dev/null
+++ b/examples/esp32c3/examples/sw_and_hw.rs
@@ -0,0 +1,66 @@
+#![no_main]
+#![no_std]
+
+#[rtic::app(device = esp32c3, dispatchers=[FROM_CPU_INTR0, FROM_CPU_INTR1])]
+mod app {
+ use esp_backtrace as _;
+ use esp_hal::{
+ gpio::{Event, Gpio9, Input, PullDown, IO},
+ peripherals::Peripherals,
+ prelude::*,
+ };
+ use esp_println::println;
+ #[shared]
+ struct Shared {}
+
+ #[local]
+ struct Local {
+ button: Gpio9>,
+ }
+
+ // do nothing in init
+ #[init]
+ fn init(_: init::Context) -> (Shared, Local) {
+ println!("init");
+ let peripherals = Peripherals::take();
+ let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
+ let mut button = io.pins.gpio9.into_pull_down_input();
+ button.listen(Event::FallingEdge);
+ foo::spawn().unwrap();
+ (Shared {}, Local { button })
+ }
+
+ #[idle()]
+ fn idle(_: idle::Context) -> ! {
+ println!("idle");
+ loop {}
+ }
+
+ #[task(priority = 5)]
+ async fn foo(_: foo::Context) {
+ bar::spawn().unwrap(); //enqueue low prio task
+ println!("Inside high prio task, press button now!");
+ let mut x = 0;
+ while x < 5000000 {
+ x += 1; //burn cycles
+ esp_hal::riscv::asm::nop();
+ }
+ println!("Leaving high prio task.");
+ }
+ #[task(priority = 2)]
+ async fn bar(_: bar::Context) {
+ println!("Inside low prio task, press button now!");
+ let mut x = 0;
+ while x < 5000000 {
+ x += 1; //burn cycles
+ esp_hal::riscv::asm::nop();
+ }
+ println!("Leaving low prio task.");
+ }
+
+ #[task(binds=GPIO, local=[button], priority = 3)]
+ fn gpio_handler(cx: gpio_handler::Context) {
+ cx.local.button.clear_interrupt();
+ println!("button");
+ }
+}
diff --git a/examples/esp32c3/rust-toolchain.toml b/examples/esp32c3/rust-toolchain.toml
new file mode 100644
index 0000000000..446d6fe524
--- /dev/null
+++ b/examples/esp32c3/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel = "nightly-2023-11-14"
+components = ["rust-src"]
+targets = ["riscv32imc-unknown-none-elf"]
diff --git a/rtic-macros/src/codegen/bindings/esp32c3.rs b/rtic-macros/src/codegen/bindings/esp32c3.rs
index f8ea22a34c..26617e079c 100644
--- a/rtic-macros/src/codegen/bindings/esp32c3.rs
+++ b/rtic-macros/src/codegen/bindings/esp32c3.rs
@@ -176,11 +176,11 @@ mod esp32c3 {
// Check for stack overflow using symbols from `risc-v-rt`.
extern "C" {
pub static _stack_start: u32;
- pub static __ebss: u32;
+ pub static _bss_end: u32;
}
let stack_start = &_stack_start as *const _ as u32;
- let ebss = &__ebss as *const _ as u32;
+ let ebss = &_bss_end as *const _ as u32;
if stack_start > ebss {
// No flip-link usage, check the SP for overflow.
@@ -241,8 +241,9 @@ mod esp32c3 {
stmts
}
-}
pub fn extra_modules(_app: &App, _analysis: &SyntaxAnalysis) -> Vec {
vec![]
}
+}
+
diff --git a/rtic/Cargo.toml b/rtic/Cargo.toml
index f23c65000f..9a67dd12c0 100644
--- a/rtic/Cargo.toml
+++ b/rtic/Cargo.toml
@@ -10,13 +10,7 @@ categories = ["concurrency", "embedded", "no-std", "asynchronous"]
description = "Real-Time Interrupt-driven Concurrency (RTIC): a concurrency framework for building real-time systems"
documentation = "https://rtic.rs/"
edition = "2021"
-keywords = [
- "embedded",
- "async",
- "runtime",
- "no-std",
- "rtos",
-]
+keywords = ["embedded", "async", "runtime", "no-std", "rtos"]
license = "MIT OR Apache-2.0"
name = "rtic"
readme = "../README.md"
@@ -32,8 +26,8 @@ name = "rtic"
[dependencies]
riscv-slic = { git = "https://github.com/romancardenas/riscv-slic.git", rev = "2a91edb", optional = true }
-esp32c3 = { version = "0.20.0", optional = true}
-riscv = {version = "0.11.0", optional = true}
+esp32c3 = { version = "0.21.0", optional = true }
+riscv = { version = "0.11.0", optional = true }
cortex-m = { version = "0.7.0", optional = true }
bare-metal = "1.0.0"
# portable-atomic = { version = "0.3.19" }
@@ -68,7 +62,14 @@ thumbv8main-backend = ["cortex-m", "rtic-macros/cortex-m-basepri"]
# riscv-clic-backend = ["rtic-macros/riscv-clic"]
# riscv-ch32-backend = ["rtic-macros/riscv-ch32"]
riscv-esp32c3-backend = ["esp32c3", "riscv", "rtic-macros/riscv-esp32c3"]
-riscv-clint-backend = ["riscv", "riscv-slic/clint-backend", "rtic-macros/riscv-slic"]
+riscv-clint-backend = [
+ "riscv",
+ "riscv-slic/clint-backend",
+ "rtic-macros/riscv-slic",
+]
# needed for testing
-test-critical-section = ["cortex-m/critical-section-single-core", "rtic-monotonics/systick-100hz"]
+test-critical-section = [
+ "cortex-m/critical-section-single-core",
+ "rtic-monotonics/systick-100hz",
+]
diff --git a/xtask/src/argument_parsing.rs b/xtask/src/argument_parsing.rs
index a3a404f1e5..f72be77710 100644
--- a/xtask/src/argument_parsing.rs
+++ b/xtask/src/argument_parsing.rs
@@ -166,8 +166,8 @@ impl Backends {
Backends::Thumbv7 => ARMV7M,
Backends::Thumbv8Base => ARMV8MBASE,
Backends::Thumbv8Main => ARMV8MMAIN,
- Backends::Riscv32ImcClint => RISCV32IMC,
- Backends::RiscvEsp32C3 | Backends::Riscv32ImacClint => RISCV32IMAC,
+ Backends::Riscv32ImcClint | Backends::RiscvEsp32C3 => RISCV32IMC,
+ Backends::Riscv32ImacClint => RISCV32IMAC,
}
}
@@ -202,6 +202,7 @@ pub enum BuildOrCheck {
#[derive(clap::ValueEnum, Copy, Clone, Default, Debug)]
pub enum Platforms {
+ Esp32C3,
Hifive1,
#[default]
Lm3s6965,
@@ -215,6 +216,7 @@ pub enum Platforms {
impl Platforms {
pub fn name(&self) -> String {
let name = match self {
+ Platforms::Esp32C3 => "esp32c3",
Platforms::Hifive1 => "hifive1",
Platforms::Lm3s6965 => "lm3s6965",
Platforms::Nrf52840 => "nrf52840",
@@ -230,6 +232,7 @@ impl Platforms {
pub fn rust_flags(&self) -> Vec {
let c = "-C".to_string();
match self {
+ Platforms::Esp32C3 => vec![c, "link-arg=-Tlinkall.x".to_string()],
Platforms::Hifive1 => vec![c, "link-arg=-Thifive1-link.x".to_string()],
Platforms::Lm3s6965 => vec![c, "link-arg=-Tlink.x".to_string()],
Platforms::Nrf52840 => vec![
@@ -267,6 +270,7 @@ impl Platforms {
/// Get the default backend for the platform
pub fn default_backend(&self) -> Backends {
match self {
+ Platforms::Esp32C3 => Backends::RiscvEsp32C3,
Platforms::Hifive1 => Backends::Riscv32ImcClint,
Platforms::Lm3s6965 => Backends::Thumbv7,
Platforms::Nrf52840 => unimplemented!(),
@@ -282,6 +286,10 @@ impl Platforms {
/// If the backend is supported, but no special features are needed, return Ok(None).
pub fn features(&self, backend: &Backends) -> Result