Embassy compatibility #49
Description
The Embassy project imposes first-class async support in the Rust embedded world including wake-on-interrupt scenarios which may be extremely helpful in certain scenarios. Alas, this HAL crate is not compatible with embassy as it's not providing a generic timer driver.
My build.rs:
use std::env;
use std::fs::File;
use std::io::Write;
use std::path::PathBuf;
fn main() {
// Put `memory.x` in our output directory and ensure it's
// on the linker search path.
let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
File::create(out.join("memory.x"))
.unwrap()
.write_all(include_bytes!("memory.x"))
.unwrap();
println!("cargo:rustc-link-search={}", out.display());
// By default, Cargo will re-run a build script whenever
// any file in the project changes. By specifying `memory.x`
// here, we ensure the build script is only re-run when
// `memory.x` is changed.
println!("cargo:rerun-if-changed=memory.x");
println!("cargo:rustc-link-arg-bins=--nmagic");
println!("cargo:rustc-link-arg-bins=-Tlink.x");
println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
}and the main file:
#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_time::Timer;
use gd32f1x0_hal::{pac, prelude::*};
use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
loop {
Timer::after_millis(1000).await;
info!("one more second")
}
}Error on cargo build:
= note: rust-lld: error: undefined symbol: _embassy_time_now
>>> referenced by lib.rs:146 (src/lib.rs:146)
>>> embassy_time_driver-faf69ddeeee7d3fa.embassy_time_driver.71181d876a0d80ab-cgu.0.rcgu.o:(embassy_time_driver::now::h00fe3dbe3ce1d7f3) in archive /home/serhii/work/rusty-gd32/target/thumbv7m-none-eabi/debug/deps/libembassy_time_driver-faf69ddeeee7d3fa.rlib
rust-lld: error: undefined symbol: _embassy_time_allocate_alarm
>>> referenced by lib.rs:153 (src/lib.rs:153)
>>> embassy_time_driver-faf69ddeeee7d3fa.embassy_time_driver.71181d876a0d80ab-cgu.0.rcgu.o:(embassy_time_driver::allocate_alarm::h65b3cb5669a83b80) in archive /home/serhii/work/rusty-gd32/target/thumbv7m-none-eabi/debug/deps/libembassy_time_driver-faf69ddeeee7d3fa.rlib
rust-lld: error: undefined symbol: _embassy_time_set_alarm_callback
>>> referenced by lib.rs:158 (src/lib.rs:158)
>>> embassy_time_driver-faf69ddeeee7d3fa.embassy_time_driver.71181d876a0d80ab-cgu.0.rcgu.o:(embassy_time_driver::set_alarm_callback::h61450a8a8b58bacf) in archive /home/serhii/work/rusty-gd32/target/thumbv7m-none-eabi/debug/deps/libembassy_time_driver-faf69ddeeee7d3fa.rlib
rust-lld: error: undefined symbol: _embassy_time_set_alarm
>>> referenced by lib.rs:163 (src/lib.rs:163)
>>> embassy_time_driver-faf69ddeeee7d3fa.embassy_time_driver.71181d876a0d80ab-cgu.0.rcgu.o:(embassy_time_driver::set_alarm::h3bb1783fe163909a) in archive /home/serhii/work/rusty-gd32/target/thumbv7m-none-eabi/debug/deps/libembassy_time_driver-faf69ddeeee7d3fa.rlib