Crate atat

Expand description

A helper crate to abstract away the state management and string parsing of AT command communication.

It works by creating structs for each AT command, that each implements AtatCmd. With corresponding response structs that each implements AtatResp.

This can be simplified alot using the atat_derive crate!

Examples

Command and response example without `atat_derive`:

use atat::{AtatCmd, AtatResp, Error, InternalError};
use core::fmt::Write;
use heapless::{String, Vec};

pub struct SetGreetingText<'a> {
    pub text: &'a str,
}

pub struct GetGreetingText;

pub struct NoResponse;

impl AtatResp for NoResponse {};

pub struct GreetingText {
    pub text: String<64>,
};

impl AtatResp for GreetingText {};

impl<'a> AtatCmd<64> for SetGreetingText<'a> {
    type Response = NoResponse;

    fn as_bytes(&self) -> Vec<u8, 64> {
        let mut buf: Vec<u8, 64> = Vec::new();
        write!(buf, "AT+CSGT={}", self.text);
        buf
    }

    fn parse(&self, resp: Result<&[u8], InternalError>) -> Result<Self::Response, Error> {
        Ok(NoResponse)
    }
}

impl AtatCmd<8> for GetGreetingText {
    type Response = GreetingText;

    fn as_bytes(&self) -> Vec<u8, 8> {
        Vec::from_slice(b"AT+CSGT?").unwrap()
    }

    fn parse(&self, resp: Result<&[u8], InternalError>) -> Result<Self::Response, Error> {
        // Parse resp into `GreetingText`
        Ok(GreetingText {
            text: String::from(core::str::from_utf8(resp.unwrap()).unwrap()),
        })
    }
}

Same example with `atat_derive`:

use atat::atat_derive::{AtatCmd, AtatResp};
use heapless::String;

#[derive(Clone, AtatCmd)]
#[at_cmd("+CSGT", NoResponse)]
pub struct SetGreetingText<'a> {
    #[at_arg(position = 0, len = 32)]
    pub text: &'a str,
}

#[derive(Clone, AtatCmd)]
#[at_cmd("+CSGT?", GreetingText)]
pub struct GetGreetingText;

#[derive(Clone, AtatResp)]
pub struct NoResponse;

#[derive(Clone, AtatResp)]
pub struct GreetingText {
    #[at_arg(position = 0)]
    pub text: String<64>,
};

Basic usage example (More available in examples folder):


use cortex_m::asm;
use hal::{
    gpio::{
        gpioa::{PA2, PA3},
        Alternate, Floating, Input, AF7,
    },
    pac::{interrupt, Peripherals, USART2},
    prelude::*,
    serial::{Config, Event::Rxne, Rx, Serial},
    timer::{Event, Timer},
};

use atat::{atat_derive::{AtatResp, AtatCmd}};

use heapless::{spsc::Queue, String};

use crate::rt::entry;
static mut INGRESS: Option<atat::IngressManager> = None;
static mut RX: Option<Rx<USART2>> = None;


#[derive(Clone, AtatResp)]
pub struct NoResponse;

#[derive(Clone, AtatCmd)]
#[at_cmd("", NoResponse, timeout_ms = 1000)]
pub struct AT;

#[entry]
fn main() -> ! {
    let p = Peripherals::take().unwrap();

    let mut flash = p.FLASH.constrain();
    let mut rcc = p.RCC.constrain();
    let mut pwr = p.PWR.constrain(&mut rcc.apb1r1);

    let mut gpioa = p.GPIOA.split(&mut rcc.ahb2);

    let clocks = rcc.cfgr.freeze(&mut flash.acr, &mut pwr);

    let tx = gpioa.pa2.into_af7(&mut gpioa.moder, &mut gpioa.afrl);
    let rx = gpioa.pa3.into_af7(&mut gpioa.moder, &mut gpioa.afrl);

    let mut timer = Timer::tim7(p.TIM7, 1.hz(), clocks, &mut rcc.apb1r1);
    let at_timer = Timer::tim6(p.TIM6, 100.hz(), clocks, &mut rcc.apb1r1);

    let mut serial = Serial::usart2(
        p.USART2,
        (tx, rx),
        Config::default().baudrate(115_200.bps()),
        clocks,
        &mut rcc.apb1r1,
    );

    serial.listen(Rxne);

    static mut RES_QUEUE: ResQueue<256> = Queue::new();
    static mut URC_QUEUE: UrcQueue<256, 10> = Queue::new();
    static mut COM_QUEUE: ComQueue = Queue::new();

    let queues = Queues {
        res_queue: unsafe { RES_QUEUE.split() },
        urc_queue: unsafe { URC_QUEUE.split() },
        com_queue: unsafe { COM_QUEUE.split() },
    };

    let (tx, rx) = serial.split();
    let (mut client, ingress) =
        ClientBuilder::new(tx, timer, atat::Config::new(atat::Mode::Timeout)).build(queues);

    unsafe { INGRESS = Some(ingress) };
    unsafe { RX = Some(rx) };

    // configure NVIC interrupts
    unsafe { cortex_m::peripheral::NVIC::unmask(hal::stm32::Interrupt::TIM7) };
    timer.listen(Event::TimeOut);

    // if all goes well you should reach this breakpoint
    asm::bkpt();

    loop {
        asm::wfi();

        match client.send(&AT) {
            Ok(response) => {
                // Do something with response here
            }
            Err(e) => {}
        }
    }
}

#[interrupt]
fn TIM7() {
    let ingress = unsafe { INGRESS.as_mut().unwrap() };
    ingress.digest();
}

#[interrupt]
fn USART2() {
    let ingress = unsafe { INGRESS.as_mut().unwrap() };
    let rx = unsafe { RX.as_mut().unwrap() };
    if let Ok(d) = nb::block!(rx.read()) {
        ingress.write(&[d]);
    }
}

Optional Cargo Features

derive (enabled by default) - Re-exports atat_derive to allow deriving Atat__ traits.

Re-exports

pub use bbqueue;

pub use nom;

pub use serde_bytes;

pub use heapless_bytes;

pub use atat_derive;

pub use self::derive::AtatLen;

pub use serde_at;

pub use heapless;

pub use digest::AtDigester;

pub use digest::AtDigester as DefaultDigester;

pub use digest::DigestResult;

pub use digest::Digester;

pub use digest::Parser;

Client responsible for handling send, receive and timeout from the userfacing side. The client is decoupled from the ingress-manager through some spsc queue consumers, where any received responses can be dequeued. The Client also has an spsc producer, to allow signaling commands like reset to the ingress-manager.

ClientBuilder

Builder to set up a Client and IngressManager pair.

Config

Configuration of both the ingress manager, and the AT client. Some of these parameters can be changed on the fly, through issuing a Command from the client.

IngressManager

Queues