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

/// Types for the peripheral singletons.
#[macro_export]
macro_rules! peripherals_definition {
    ($($(#[$cfg:meta])? $name:ident),*$(,)?) => {
        /// Types for the peripheral singletons.
        pub mod peripherals {
            $(
                $(#[$cfg])?
                #[allow(non_camel_case_types)]
                #[doc = concat!(stringify!($name), " peripheral")]
                pub struct $name { _private: () }

                $(#[$cfg])?
                impl $name {
                    /// Unsafely create an instance of this peripheral out of thin air.
                    ///
                    /// # Safety
                    ///
                    /// You must ensure that you're only using one instance of this type at a time.
                    #[inline]
                    pub unsafe fn steal() -> Self {
                        Self{ _private: ()}
                    }
                }

                $(#[$cfg])?
                $crate::impl_peripheral!($name);
            )*
        }
    };
}

/// Define the peripherals struct.
#[macro_export]
macro_rules! peripherals_struct {
    ($($(#[$cfg:meta])? $name:ident),*$(,)?) => {
        /// Struct containing all the peripheral singletons.
        ///
        /// To obtain the peripherals, you must initialize the HAL, by calling [`crate::init`].
        #[allow(non_snake_case)]
        pub struct Peripherals {
            $(
                #[doc = concat!(stringify!($name), " peripheral")]
                $(#[$cfg])?
                pub $name: peripherals::$name,
            )*
        }

        impl Peripherals {
            ///Returns all the peripherals *once*
            #[inline]
            pub(crate) fn take() -> Self {
                critical_section::with(Self::take_with_cs)
            }

            ///Returns all the peripherals *once*
            #[inline]
            pub(crate) fn take_with_cs(_cs: critical_section::CriticalSection) -> Self {
                #[no_mangle]
                static mut _EMBASSY_DEVICE_PERIPHERALS: bool = false;

                // safety: OK because we're inside a CS.
                unsafe {
                    if _EMBASSY_DEVICE_PERIPHERALS {
                        panic!("init called more than once!")
                    }
                    _EMBASSY_DEVICE_PERIPHERALS = true;
                    Self::steal()
                }
            }
        }

        impl Peripherals {
            /// Unsafely create an instance of this peripheral out of thin air.
            ///
            /// # Safety
            ///
            /// You must ensure that you're only using one instance of this type at a time.
            #[inline]
            pub unsafe fn steal() -> Self {
                Self {
                    $(
                        $(#[$cfg])?
                        $name: peripherals::$name::steal(),
                    )*
                }
            }
        }
    };
}

/// Defining peripheral type.
#[macro_export]
macro_rules! peripherals {
    ($($(#[$cfg:meta])? $name:ident),*$(,)?) => {
        $crate::peripherals_definition!(
            $(
                $(#[$cfg])?
                $name,
            )*
        );
        $crate::peripherals_struct!(
            $(
                $(#[$cfg])?
                $name,
            )*
        );
    };
}

/// Convenience converting into reference.
#[macro_export]
macro_rules! into_ref {
    ($($name:ident),*) => {
        $(
            let mut $name = $name.into_ref();
        )*
    }
}

/// Implement the peripheral trait.
#[macro_export]
macro_rules! impl_peripheral {
    ($type:ident) => {
        impl $crate::Peripheral for $type {
            type P = $type;

            #[inline]
            unsafe fn clone_unchecked(&self) -> Self::P {
                #[allow(clippy::needless_update)]
                $type { ..*self }
            }
        }
    };
}