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Rust's hardware abstract layer (HAL) for K210 chip, a dual RV64GC SoC with hardware accelerated AI peripherals. Contributions welcomed!

Rust 100.00%

rust rust-embedded embedded-hal k210 kendryte riscv

k210-hal's Introduction

`k210-hal`

Hardware abstract layer (HAL) for K210 chip, a dual RV64GC SoC with hardware accelerated AI peripherals.

This project is developed and maintained by the RISC-V team.

Documentation

License

Copyright 2019 RISC-V team

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Code of Conduct

Contribution to this crate is organized under the terms of the Rust Code of Conduct, the maintainer of this crate, the RISC-V team, promises to intervene to uphold that code of conduct.

k210-hal's People

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k210-hal's Issues

Another release?

A lot of important changes have happened to k210-hal since 2019 (the last release) like this:
http://github.com/riscv-rust/k210-hal/commit/4b817b75a7296ab221f11b751c6ea20de980132a

Any chance of a 0.3.0?

GPIO abstraction

I am trying to wrap my head around the GPIO abstraction. The use of the type system is clever and intuitive (only a single owner for a given GPIO interface); however, I am struggling to understand how to use this architecture when the pull mode of the pin must change over time for signaling purposes.

I am trying to build a driver for a DHT-22 sensor, which uses a proprietary 1-wire signaling over GPIO. My first attempt looked something like this:

pub struct DhtReport {
    temperature: f32,
    humidity: f32
}

pub enum DhtError {
    Unavailable
}

type DhtResult = Result<DhtReport, DhtError>;

pub struct Dht22<GPIO, PIN> {
    gpio: GPIO,
    pin: PIN
}

impl<GPIO: GpioIndex, PIN: IoPin + Mode<GPIO::FUNC>> Dht22<GPIO, PIN>  {
    pub fn new(gpio: GPIO, pin: PIN) -> Self {
        Dht22 {
            gpio, pin
        }
    }
    pub fn report(&mut self) -> DhtResult {
        let buffer: [u8; 40] = [0; 40];
        let pin = Gpio::new(self.gpio, self.pin);
        let result = DhtReport {
            temperature: 0f32,
            humidity: 0f32
        };
        Err(DhtError::Unavailable)
    }
}

As you can see, that's not going to work because the ownership model prevents copying. Makes sense, but trying to use the Gpio abstraction doesn't work either, because while I can store an owned Gpio<GPIO, PIN>, due to type-mismatch and the ownership model, the pull direction cannot be changed through a mutable reference.

What am I supposed to do here? I suspect my inexperience of Rust is getting in the way here.

Consider add a repository link to Cargo.toml.

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