Module async_runtime 

Embassy-based async runtime hosted on the oveRTOS C substrate.

Activated by the async Cargo feature combined with C-side CONFIG_OVE_ASYNC=y (build.rs detects this and emits cfg(has_async)). The module provides:

• Executor — wraps embassy_executor::raw::Executor and blocks on ove_event_wait between polls. Yields cleanly to the underlying RTOS scheduler on FreeRTOS / Zephyr / NuttX; on POSIX blocks on a pthread condvar. Replaces the upstream __pender symbol with one that signals an ove_event via the right thread-vs-ISR variant.
• critical_section::Impl backed by ove_irq_lock / ove_irq_unlock on every target.
• embassy_time_driver::Driver backed by ove_time_get_us + ove_timer_*_ns.
• Async wrappers around the comm primitives (AsyncStream, AsyncQueue, AsyncEventGroup, AsyncSemaphore, AsyncUart, AsyncInput) that ride on the C-level _set_notify hooks.

Re-exports

pub use eventgroup::AsyncEventGroup;

pub use executor::Executor;

pub use gpio::AsyncInput;

pub use i2c::AsyncI2c;

pub use queue::AsyncQueue;

pub use semaphore::AsyncSemaphore;

pub use spi::AsyncSpi;

pub use stream::AsyncStream;

pub use uart::AsyncUart;

Modules

eventgroup

Async wrapper around crate::EventGroup using ove_eventgroup_set_notify.

executor

oveRTOS-native embassy executor.

gpio

Async GPIO input wrapper using the existing ove_gpio_irq_register callback path — no new C-side API needed.

i2c

Async I2C bus wrapper. See super::spi for the design notes — same pattern, with an embedded_hal_async::i2c::I2c<SevenBitAddress> impl when the embedded-hal-async feature is enabled.

queue

Async wrapper around crate::Queue using ove_queue_set_notify.

semaphore

Async wrapper around crate::Semaphore using ove_sem_set_notify.

spi

Async SPI bus wrapper.

stream

Async wrapper around crate::Stream using the C-level ove_stream_set_notify notify hook.

uart

Async wrapper around crate::Uart using ove_uart_set_rx_notify, which delegates to the underlying RX stream’s notify hook.

Structs

Spawner

Re-export of embassy_executor::Spawner. The Spawner returned by the executor’s run-loop init closure is this type. Handle to spawn tasks into an executor.