1//! DMA word sizes.
2
3#[allow(missing_docs)]
4#[derive(Debug, Copy, Clone, PartialEq, Eq)]
5#[cfg_attr(feature = "defmt", derive(defmt::Format))]
6pub enum WordSize {
7 OneByte,
8 TwoBytes,
9 FourBytes,
10}
11
12impl WordSize {
13 /// Amount of bytes of this word size.
14 pub fn bytes(&self) -> usize {
15 match self {
16 Self::OneByte => 1,
17 Self::TwoBytes => 2,
18 Self::FourBytes => 4,
19 }
20 }
21}
22
23trait SealedWord {}
24
25/// DMA word trait.
26///
27/// This is implemented for u8, u16, u32, etc.
28#[allow(private_bounds)]
29pub trait Word: SealedWord + Default + Copy + 'static {
30 /// Word size
31 fn size() -> WordSize;
32 /// Amount of bits of this word size.
33 fn bits() -> usize;
34}
35
36macro_rules! impl_word {
37 (_, $T:ident, $bits:literal, $size:ident) => {
38 impl SealedWord for $T {}
39 impl Word for $T {
40 fn bits() -> usize {
41 $bits
42 }
43 fn size() -> WordSize {
44 WordSize::$size
45 }
46 }
47 };
48 ($T:ident, $uX:ident, $bits:literal, $size:ident) => {
49 #[repr(transparent)]
50 #[derive(Copy, Clone, Default)]
51 #[doc = concat!(stringify!($T), " word size")]
52 pub struct $T(pub $uX);
53 impl_word!(_, $T, $bits, $size);
54 };
55}
56
57impl_word!(U1, u8, 1, OneByte);
58impl_word!(U2, u8, 2, OneByte);
59impl_word!(U3, u8, 3, OneByte);
60impl_word!(U4, u8, 4, OneByte);
61impl_word!(U5, u8, 5, OneByte);
62impl_word!(U6, u8, 6, OneByte);
63impl_word!(U7, u8, 7, OneByte);
64impl_word!(_, u8, 8, OneByte);
65impl_word!(U9, u16, 9, TwoBytes);
66impl_word!(U10, u16, 10, TwoBytes);
67impl_word!(U11, u16, 11, TwoBytes);
68impl_word!(U12, u16, 12, TwoBytes);
69impl_word!(U13, u16, 13, TwoBytes);
70impl_word!(U14, u16, 14, TwoBytes);
71impl_word!(U15, u16, 15, TwoBytes);
72impl_word!(_, u16, 16, TwoBytes);
73impl_word!(U17, u32, 17, FourBytes);
74impl_word!(U18, u32, 18, FourBytes);
75impl_word!(U19, u32, 19, FourBytes);
76impl_word!(U20, u32, 20, FourBytes);
77impl_word!(U21, u32, 21, FourBytes);
78impl_word!(U22, u32, 22, FourBytes);
79impl_word!(U23, u32, 23, FourBytes);
80impl_word!(U24, u32, 24, FourBytes);
81impl_word!(U25, u32, 25, FourBytes);
82impl_word!(U26, u32, 26, FourBytes);
83impl_word!(U27, u32, 27, FourBytes);
84impl_word!(U28, u32, 28, FourBytes);
85impl_word!(U29, u32, 29, FourBytes);
86impl_word!(U30, u32, 30, FourBytes);
87impl_word!(U31, u32, 31, FourBytes);
88impl_word!(_, u32, 32, FourBytes);
89