cntrlr 0.1.0

Simple, async embedded framework
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// SPDX-License-Identifier: AGPL-3.0-or-later
// Copyright 2020 Branan Riley <me@branan.info>

//! Digital pin support specific to the Teensy 3.2

use crate::{
    digital::PinMode,
    hw::{
        board::teensy_common::digital::{ModeOp, PinOp, ReadOp, WriteOp},
        mcu::kinetis::mk20dx256::{Port, Sim},
    },
    sync::Once,
};

/// Invoke an operation on a pin.
///
/// This abstracts the mapping of Teensy pins to MCU pins, allowing
/// operations to be defined generically and then invoked for any
/// given pin.
#[inline]
pub fn pin_op<Op: PinOp>(pin: usize, arg: Op::Arg) -> Option<Op::Result> {
    match pin {
        0 => Op::do_op(port_b().and_then(|port| port.pin::<16>()), arg),
        1 => Op::do_op(port_b().and_then(|port| port.pin::<17>()), arg),
        2 => Op::do_op(port_d().and_then(|port| port.pin::<0>()), arg),
        3 => Op::do_op(port_a().and_then(|port| port.pin::<12>()), arg),
        4 => Op::do_op(port_a().and_then(|port| port.pin::<13>()), arg),
        5 => Op::do_op(port_d().and_then(|port| port.pin::<7>()), arg),
        6 => Op::do_op(port_d().and_then(|port| port.pin::<4>()), arg),
        7 => Op::do_op(port_d().and_then(|port| port.pin::<2>()), arg),
        8 => Op::do_op(port_d().and_then(|port| port.pin::<3>()), arg),
        9 => Op::do_op(port_c().and_then(|port| port.pin::<3>()), arg),
        10 => Op::do_op(port_c().and_then(|port| port.pin::<4>()), arg),
        11 => Op::do_op(port_c().and_then(|port| port.pin::<6>()), arg),
        12 => Op::do_op(port_c().and_then(|port| port.pin::<7>()), arg),
        13 => Op::do_op(port_c().and_then(|port| port.pin::<5>()), arg),
        14 => Op::do_op(port_d().and_then(|port| port.pin::<1>()), arg),
        15 => Op::do_op(port_c().and_then(|port| port.pin::<0>()), arg),
        16 => Op::do_op(port_b().and_then(|port| port.pin::<0>()), arg),
        17 => Op::do_op(port_b().and_then(|port| port.pin::<1>()), arg),
        18 => Op::do_op(port_b().and_then(|port| port.pin::<3>()), arg),
        19 => Op::do_op(port_b().and_then(|port| port.pin::<2>()), arg),
        20 => Op::do_op(port_d().and_then(|port| port.pin::<5>()), arg),
        21 => Op::do_op(port_d().and_then(|port| port.pin::<6>()), arg),
        22 => Op::do_op(port_c().and_then(|port| port.pin::<1>()), arg),
        23 => Op::do_op(port_c().and_then(|port| port.pin::<2>()), arg),
        24 => Op::do_op(port_a().and_then(|port| port.pin::<5>()), arg),
        25 => Op::do_op(port_b().and_then(|port| port.pin::<19>()), arg),
        26 => Op::do_op(port_e().and_then(|port| port.pin::<1>()), arg),
        27 => Op::do_op(port_c().and_then(|port| port.pin::<9>()), arg),
        28 => Op::do_op(port_c().and_then(|port| port.pin::<8>()), arg),
        29 => Op::do_op(port_c().and_then(|port| port.pin::<10>()), arg),
        30 => Op::do_op(port_c().and_then(|port| port.pin::<11>()), arg),
        31 => Op::do_op(port_e().and_then(|port| port.pin::<0>()), arg),
        32 => Op::do_op(port_b().and_then(|port| port.pin::<18>()), arg),
        33 => Op::do_op(port_a().and_then(|port| port.pin::<4>()), arg),
        34 => Op::do_op(port_a().and_then(|port| port.pin::<1>()), arg),
        _ => None,
    }
}

/// Set a digital pin high or low.
///
/// The digital pins on the Teensy 3.0 are 5V tolerant, but use
/// 3.3V thresholds.
///
/// If `pin` is not a valid pin, does nothing.
///
/// Interactions with this method may be unpredictable if the pin
/// is not in an output mode or is in use by another module. In
/// particular, whether the write takes effect when the pin
/// becomes a digital output is MCU-specific and should not be
/// relied upon.
#[inline]
pub fn digital_write(pin: usize, value: bool) {
    pin_op::<WriteOp>(pin, value);
}

/// Read the state of a digital pin.
///
/// The digital pins on the Teensy 3.0 output 3.3V.
///
/// If `pin` is not a valid pin, returns `false`
///
/// The return value is implementation-specific and should not be
/// relied upon in the following cases:
/// * The pin is not set as a digital input
/// * The pin is in use by a different module
/// * The pin number is outside the range of pins on the board.
#[inline]
pub fn digital_read(pin: usize) -> bool {
    pin_op::<ReadOp>(pin, ()).unwrap_or(false)
}

/// Set a pin as a digital input or output
///
/// If `pin` is not a valid pin, does nothing.
///
/// Interactions with this method may be unpredictable if the pin
/// is in use by another module. In particular, whether or not
/// changes made by this method will take effect when the other
/// module releases the pin is implementation specific and should
/// not be relied upon.
#[inline]
pub fn pin_mode(pin: usize, mode: PinMode) {
    pin_op::<ModeOp>(pin, mode);
}

/// Port A
///
/// The global instance of PORT A, used to share port ownership among
/// different board modules.
pub fn port_a() -> Option<&'static Port<0>> {
    static PORT: Once<Port<0>> = Once::new();
    PORT.get_or_try_init(|| Sim::get().as_mut().and_then(Sim::enable_peripheral))
}

/// Port B
///
/// The global instance of PORT B, used to share port ownership among
/// different board modules.
pub fn port_b() -> Option<&'static Port<1>> {
    static PORT: Once<Port<1>> = Once::new();
    PORT.get_or_try_init(|| Sim::get().as_mut().and_then(Sim::enable_peripheral))
}

/// Port C
///
/// The global instance of PORT C, used to share port ownership among
/// different board modules.
pub fn port_c() -> Option<&'static Port<2>> {
    static PORT: Once<Port<2>> = Once::new();
    PORT.get_or_try_init(|| Sim::get().as_mut().and_then(Sim::enable_peripheral))
}

/// Port D
///
/// The global instance of PORT D, used to share port ownership among
/// different board modules.
pub fn port_d() -> Option<&'static Port<3>> {
    static PORT: Once<Port<3>> = Once::new();
    PORT.get_or_try_init(|| Sim::get().as_mut().and_then(Sim::enable_peripheral))
}

/// Port E
///
/// The global instance of PORT E, used to share port ownership among
/// different board modules.
pub fn port_e() -> Option<&'static Port<4>> {
    static PORT: Once<Port<4>> = Once::new();
    PORT.get_or_try_init(|| Sim::get().as_mut().and_then(Sim::enable_peripheral))
}