sdmmc_core/command/class/class1/cmd46/
arg.rs

1use crate::lib_bitfield;
2use crate::result::{Error, Result};
3
4lib_bitfield! {
5    /// Argumentument for CMD46.
6    pub Argument(u32): u16 {
7        /// Queued task ID.
8        raw_task_id: 20, 16;
9    }
10}
11
12impl Argument {
13    /// Represents the byte length of the [Argument].
14    pub const LEN: usize = 4;
15    /// Represents the default value of the [Argument].
16    pub const DEFAULT: u32 = 0;
17
18    /// Creates a new [Argument].
19    pub const fn new() -> Self {
20        Self(Self::DEFAULT)
21    }
22
23    /// Gets the queued task ID for the [Argument].
24    pub const fn task_id(&self) -> u8 {
25        self.raw_task_id() as u8
26    }
27
28    /// Sets the queued task ID for the [Argument].
29    pub fn set_task_id(&mut self, val: u8) {
30        self.set_raw_task_id(val as u32);
31    }
32
33    /// Attempts to convert a [`u32`] into an [`Argument`].
34    pub const fn try_from_bits(val: u32) -> Result<Self> {
35        Ok(Self(val))
36    }
37
38    /// Converts the [Argument] into a byte array.
39    pub const fn bytes(&self) -> [u8; Self::LEN] {
40        self.0.to_be_bytes()
41    }
42
43    /// Attempts to convert a byte slice into an [`Argument`].
44    pub const fn try_from_bytes(val: &[u8]) -> Result<Self> {
45        match val.len() {
46            len if len < Self::LEN => Err(Error::invalid_length(len, Self::LEN)),
47            _ => Self::try_from_bits(u32::from_be_bytes([val[0], val[1], val[2], val[3]])),
48        }
49    }
50}
51
52impl Default for Argument {
53    fn default() -> Self {
54        Self::new()
55    }
56}
57
58impl From<Argument> for u32 {
59    fn from(val: Argument) -> Self {
60        val.bits()
61    }
62}
63
64impl From<Argument> for [u8; Argument::LEN] {
65    fn from(val: Argument) -> Self {
66        val.bytes()
67    }
68}
69
70impl TryFrom<u32> for Argument {
71    type Error = Error;
72
73    fn try_from(val: u32) -> Result<Self> {
74        Self::try_from_bits(val)
75    }
76}
77
78impl TryFrom<&[u8]> for Argument {
79    type Error = Error;
80
81    fn try_from(val: &[u8]) -> Result<Self> {
82        Self::try_from_bytes(val)
83    }
84}
85
86impl<const N: usize> TryFrom<&[u8; N]> for Argument {
87    type Error = Error;
88
89    fn try_from(val: &[u8; N]) -> Result<Self> {
90        Self::try_from_bytes(val.as_ref())
91    }
92}
93
94impl<const N: usize> TryFrom<[u8; N]> for Argument {
95    type Error = Error;
96
97    fn try_from(val: [u8; N]) -> Result<Self> {
98        Self::try_from_bytes(val.as_ref())
99    }
100}
101
102#[cfg(test)]
103mod tests {
104    use super::*;
105
106    #[test]
107    fn test_fields() {
108        (1..=u32::BITS)
109            .map(|r| ((1u64 << r) - 1) as u32)
110            .for_each(|raw_arg| {
111                let mut exp_arg = Argument(raw_arg);
112                let raw = raw_arg.to_be_bytes();
113                let exp_task_id = ((raw_arg & 0x1f_0000) >> 16) as u8;
114
115                assert_eq!(Argument::try_from_bits(raw_arg), Ok(exp_arg));
116                assert_eq!(Argument::try_from_bytes(&raw), Ok(exp_arg));
117                assert_eq!(Argument::try_from(raw_arg), Ok(exp_arg));
118                assert_eq!(Argument::try_from(&raw), Ok(exp_arg));
119                assert_eq!(Argument::try_from(raw), Ok(exp_arg));
120
121                assert_eq!(exp_arg.bits(), raw_arg);
122                assert_eq!(exp_arg.bytes(), raw);
123
124                assert_eq!(exp_arg.task_id(), exp_task_id);
125
126                exp_arg.set_task_id(0);
127                assert_eq!(exp_arg.task_id(), 0);
128
129                exp_arg.set_task_id(exp_task_id);
130                assert_eq!(exp_arg.task_id(), exp_task_id);
131            });
132    }
133}
sdmmc_core/command/class/class1/cmd46/arg.rs

sdmmc_core/command/class/class1/cmd46/
arg.rs
