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Add SMBus HAL, dependent on embedded-hal-async::I2c #7

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Add SMBus HAL, dependent on embedded-hal-async::I2c #7

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3c0e966
Add SMBus HAL, dependent on embedded-hal-async::I2c
tullom Nov 24, 2025
0dad7cd
Added unit tests
tullom May 13, 2026
a10c732
Refactor SMBus async trait into Smbus + SwSmbusI2c
tullom May 13, 2026
92c5d66
Adress latest review comments.
tullom May 14, 2026
16ffef6
Move tests into standalone file
tullom May 15, 2026
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69 changes: 68 additions & 1 deletion Cargo.lock
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8 changes: 7 additions & 1 deletion embedded-mcu-hal/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -17,16 +17,22 @@ chrono = { version = "^0.4", default-features = false, optional = true }
defmt = { version = "1.0", optional = true }
embedded-hal = { workspace = true }
num_enum = { version = "0.7.5", default-features = false }
embedded-hal-async = "1.0.0"

[dev-dependencies]
proptest = "1.0.0"
tokio = { version = "1", features = ["macros", "rt", "time"] }
embedded-hal-mock = { version = "0.11", default-features = false, features = [
"eh1",
"embedded-hal-async",
] }
smbus-pec = { version = "1.0", default-features = false }

[features]
default = []

chrono = ["dep:chrono"]
defmt = ["dep:defmt"]
defmt = ["dep:defmt", "embedded-hal-async/defmt-03"]

[lints]
workspace = true
13 changes: 10 additions & 3 deletions embedded-mcu-hal/src/lib.rs
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Expand Up @@ -17,9 +17,14 @@
//! * **Device-agnostic** — no register addresses, magic values, or
//! MCU-specific types appear in any public API.
//!
//! * **Trait-only** — the crate ships no runtime code beyond the
//! [`time::Datetime`] value type and its helpers. Keeping implementations
//! out-of-crate means zero overhead: you only pay for what you use.
//! * **Mostly trait-only** — the crate is primarily a contract surface,
//! not a runtime. The only concrete runtime code shipped today is the
//! [`time::Datetime`] value type and its helpers, and a portable software
//! SMBus controller ([`smbus::bus::asynch::SwSmbusI2c`]) that layers the
//! SMBus protocol on top of any [`embedded_hal_async::i2c::I2c`]
//! implementation. Hardware-specific implementations of every trait
//! still belong in board or chip support crates, so generic drivers pay
//! only for what they use.
//!
//! * **`no_std` first** — every public item is usable in bare-metal firmware
//! with no heap allocator. The standard library is only linked during
Expand All @@ -45,6 +50,7 @@
//! |--------|----------------|
//! | [`time`] | Wall-clock date/time types and real-time clock (RTC) traits |
//! | [`nvram`] | Non-Volatile RAM storage traits |
//! | [`smbus`] | SMBus controller traits and a portable software implementation atop `embedded-hal-async` I²C |
//! | [`watchdog`] | Watchdog timer trait |
//!
//! # Optional Cargo features
Expand All @@ -70,5 +76,6 @@

pub mod i2c;
pub mod nvram;
pub mod smbus;
pub mod time;
pub mod watchdog;
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