1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
//! Digital I/O
//!
//! The traits in this module are now deprecated. Please use the new versions included
//! in `digital::v2`.

#![allow(deprecated)]

/// Single digital push-pull output pin
///
/// *This version of the trait is now deprecated. Please use the new `OutputPin` trait in
/// `digital::v2::OutputPin`*.

pub trait OutputPin {
    /// Drives the pin low
    ///
    /// *NOTE* the actual electrical state of the pin may not actually be low, e.g. due to external
    /// electrical sources
    fn set_low(&mut self);

    /// Drives the pin high
    ///
    /// *NOTE* the actual electrical state of the pin may not actually be high, e.g. due to external
    /// electrical sources
    fn set_high(&mut self);
}

/// Push-pull output pin that can read its output state
///
/// *This trait is available if embedded-hal is built with the `"unproven"` feature.*
///
/// *This version of the trait is now deprecated. Please use the new `StatefulOutputPin` trait in
/// `digital::v2::StatefulOutputPin`*.
#[cfg(feature = "unproven")]
pub trait StatefulOutputPin {
    /// Is the pin in drive high mode?
    ///
    /// *NOTE* this does *not* read the electrical state of the pin
    fn is_set_high(&self) -> bool;

    /// Is the pin in drive low mode?
    ///
    /// *NOTE* this does *not* read the electrical state of the pin
    fn is_set_low(&self) -> bool;
}

/// Output pin that can be toggled
///
/// *This trait is available if embedded-hal is built with the `"unproven"` feature.*
///
/// *This version of the trait is now deprecated. Please use the new `ToggleableOutputPin`
/// trait in `digital::v2::ToggleableOutputPin`*.
///
/// See [toggleable](toggleable) to use a software implementation if
/// both [OutputPin](trait.OutputPin.html) and
/// [StatefulOutputPin](trait.StatefulOutputPin.html) are
/// implemented. Otherwise, implement this using hardware mechanisms.
#[cfg(feature = "unproven")]
pub trait ToggleableOutputPin {
    /// Toggle pin output.
    fn toggle(&mut self);
}

/// If you can read **and** write the output state, a pin is
/// toggleable by software.
///
/// *This version of the module is now deprecated. Please use the new `toggleable` module in
/// `digital::v2::toggleable`*.
///
/// ```
/// use embedded_hal::digital::{OutputPin, StatefulOutputPin, ToggleableOutputPin};
/// use embedded_hal::digital::toggleable;
///
/// /// A virtual output pin that exists purely in software
/// struct MyPin {
///     state: bool
/// }
///
/// impl OutputPin for MyPin {
///    fn set_low(&mut self) {
///        self.state = false;
///    }
///    fn set_high(&mut self) {
///        self.state = true;
///    }
/// }
///
/// impl StatefulOutputPin for MyPin {
///    fn is_set_low(&self) -> bool {
///        !self.state
///    }
///    fn is_set_high(&self) -> bool {
///        self.state
///    }
/// }
///
/// /// Opt-in to the software implementation.
/// impl toggleable::Default for MyPin {}
///
/// let mut pin = MyPin { state: false };
/// pin.toggle();
/// assert!(pin.is_set_high());
/// pin.toggle();
/// assert!(pin.is_set_low());
/// ```
#[cfg(feature = "unproven")]
pub mod toggleable {
    #[allow(deprecated)]
    use super::{OutputPin, StatefulOutputPin, ToggleableOutputPin};

    /// Software-driven `toggle()` implementation.
    ///
    /// *This trait is available if embedded-hal is built with the `"unproven"` feature.*
    #[allow(deprecated)]
    pub trait Default: OutputPin + StatefulOutputPin {}

    #[allow(deprecated)]
    impl<P> ToggleableOutputPin for P
    where
        P: Default,
    {
        /// Toggle pin output
        fn toggle(&mut self) {
            if self.is_set_low() {
                self.set_high();
            } else {
                self.set_low();
            }
        }
    }
}

/// Single digital input pin
///
/// *This trait is available if embedded-hal is built with the `"unproven"` feature.*
///
/// *This version of the trait is now deprecated. Please use the new `InputPin` trait in
/// `digital::v2::InputPin`*.
#[cfg(feature = "unproven")]
pub trait InputPin {
    /// Is the input pin high?
    fn is_high(&self) -> bool;

    /// Is the input pin low?
    fn is_low(&self) -> bool;
}