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

//! Input device component interfaces for devices such as `Button`
use devices::GPIODevice;
use traits::*;
use sysfs_gpio::{Direction,Pin};


/// Represents a generic GPIO input device.
#[derive(Debug)]
pub struct InputDevice {
    pub pin : Pin
}


impl InputDevice {
    /// Creates a new input device with pin number `pin`
    pub fn new(pin:u64) -> InputDevice{
        let gpiodevice = GPIODevice::new(pin);
        // set direction to input
        gpiodevice.pin.set_direction(Direction::In).expect("Could not set pin to Input mode");
        InputDevice {
            pin: gpiodevice.pin
            }
    }
}

impl Device for InputDevice {
    fn pin(&self) -> Pin {
       self.pin
    }

    /// Returns a value representing the device's state.
    fn value(&self) -> i8 {
        
        let value =  self.pin.get_value().expect("Could not check if device is active");
        value as i8
    }
}


/// Represents a generic input device with typical on/off behaviour.
/// Adds machinery to fire the active and inactive events for devices 
/// that operate in a typical digital manner: straight forward on / off
/// states with (reasonably) clean transitions between the two.

pub struct DigitalInputDevice {
    pin : Pin
}

impl DigitalInputDevice{
    /// Create a new Digital Input Device
    pub fn new(pin:u64) -> DigitalInputDevice {
        let inpin = InputDevice::new(pin);
        DigitalInputDevice { pin: inpin.pin }
    }
}

/// gives DigitalInputDevice Device behaviours such as close, is_active, etc
impl Device for DigitalInputDevice {
    fn pin(&self) -> Pin {
       self.pin
    }

    /// Returns a value representing the device's state.
    fn value(&self) -> i8 { 
        let value =  self.pin.get_value().expect("Could not check if device is active");
        value as i8
    }
}

/// Give DigitalInputDevice event traits 
impl EventsTrait for DigitalInputDevice {}


/// Represents a simple push button or switch.
/// Connect one side of the button to a ground pin, and the other to any GPIO pin

pub struct Button {
    pin: Pin
}

impl Device for Button {
    fn pin(&self) -> Pin {
       self.pin
    }
    /// Returns a value representing the device's state.
    fn value(&self) -> i8 { 
        let value =  self.pin.get_value().expect("Could not check if device is active");
        value as i8
    }
}

impl EventsTrait for Button {}

impl Button {
    /// Create a new Button
    pub fn new(pin:u64) -> Button{
        let din = DigitalInputDevice::new(pin);
        Button{
            pin : din.pin
        }
    }

    /// Pause the script until the device is activated
    pub fn wait_for_press(&self){
        self.wait_for_active();
    }

    /// Pause the script until the device is deactivated
    pub fn wait_for_release(&self){
        self.wait_for_inactive();
    }


}    


/// Represents a generic input device which takes its value 
/// from the average of a queue of historical values.

pub struct SmoothedInputDevice;

// Todo implement SmoothedInputDevice