sdmmc_core/command/class/class0/cmd4/
arg.rs

1use crate::lib_bitfield;
2use crate::register::Dsr;
3use crate::result::{Error, Result};
4
5const DSR_SHIFT: usize = 16;
6
7lib_bitfield! {
8    /// Argumentument for [Cmd4](super::Cmd4).
9    pub Argument(u32): u16 {
10        /// Programs the DSR of all cards.
11        raw_dsr: 31, 16;
12    }
13}
14
15impl Argument {
16    /// Represents the byte length of the [Argument].
17    pub const LEN: usize = 4;
18
19    /// Creates a new [Argument].
20    pub const fn new() -> Self {
21        Self((Dsr::DEFAULT as u32) << DSR_SHIFT)
22    }
23
24    /// Gets the [Dsr] field for the [Argument].
25    pub const fn dsr(&self) -> Dsr {
26        Dsr::from_bits(self.raw_dsr())
27    }
28
29    /// Sets the [Dsr] field for the [Argument].
30    pub fn set_dsr(&mut self, val: Dsr) {
31        self.set_raw_dsr(val.bits() as u32);
32    }
33
34    /// Converts a [`u32`] into an [Argument].
35    pub const fn from_bits(val: u32) -> Self {
36        Self(val)
37    }
38
39    /// Attempts to convert a [`u32`] into an [Argument].
40    pub const fn try_from_bits(val: u32) -> Result<Self> {
41        Ok(Self::from_bits(val))
42    }
43
44    /// Converts the [Argument] into a byte array.
45    pub const fn bytes(&self) -> [u8; Self::LEN] {
46        self.0.to_be_bytes()
47    }
48
49    /// Attempts to convert a byte slice into an [Argument].
50    pub const fn try_from_bytes(val: &[u8]) -> Result<Self> {
51        match val.len() {
52            len if len < Self::LEN => Err(Error::invalid_length(len, Self::LEN)),
53            _ => Ok(Self(u32::from_be_bytes([val[0], val[1], val[2], val[3]]))),
54        }
55    }
56}
57
58impl Default for Argument {
59    fn default() -> Self {
60        Self::new()
61    }
62}
63
64impl From<u32> for Argument {
65    fn from(val: u32) -> Self {
66        Self::from_bits(val)
67    }
68}
69
70impl From<Argument> for u32 {
71    fn from(val: Argument) -> Self {
72        val.bits()
73    }
74}
75
76impl From<Argument> for [u8; Argument::LEN] {
77    fn from(val: Argument) -> Self {
78        val.bytes()
79    }
80}
81
82impl TryFrom<&[u8]> for Argument {
83    type Error = Error;
84
85    fn try_from(val: &[u8]) -> Result<Self> {
86        Self::try_from_bytes(val)
87    }
88}
89
90impl<const N: usize> TryFrom<&[u8; N]> for Argument {
91    type Error = Error;
92
93    fn try_from(val: &[u8; N]) -> Result<Self> {
94        Self::try_from_bytes(val.as_ref())
95    }
96}
97
98impl<const N: usize> TryFrom<[u8; N]> for Argument {
99    type Error = Error;
100
101    fn try_from(val: [u8; N]) -> Result<Self> {
102        Self::try_from_bytes(val.as_ref())
103    }
104}
105
106#[cfg(test)]
107mod tests {
108    use super::*;
109
110    #[test]
111    fn test_fields() {
112        let mut arg = Argument::new();
113        let new_dsr = Dsr::new();
114
115        assert_eq!(arg.dsr(), new_dsr);
116
117        (1..u32::BITS)
118            .map(|r| ((1u64 << r) - 1) as u32)
119            .for_each(|raw_arg| {
120                let mut exp_arg = Argument(raw_arg);
121                let exp_dsr = Dsr::from_bits((raw_arg >> 16) as u16);
122                let raw = raw_arg.to_be_bytes();
123
124                assert_eq!(Argument::from_bits(raw_arg), exp_arg);
125                assert_eq!(Argument::try_from_bytes(&raw), Ok(exp_arg));
126                assert_eq!(Argument::try_from(&raw), Ok(exp_arg));
127                assert_eq!(Argument::try_from(raw), Ok(exp_arg));
128
129                assert_eq!(exp_arg.bits(), raw_arg);
130                assert_eq!(exp_arg.bytes(), raw);
131
132                assert_eq!(exp_arg.dsr(), exp_dsr);
133
134                exp_arg.set_dsr(new_dsr);
135                assert_eq!(exp_arg.dsr(), new_dsr);
136
137                exp_arg.set_dsr(exp_dsr);
138                assert_eq!(exp_arg.dsr(), exp_dsr);
139            });
140    }
141}
sdmmc_core/command/class/class0/cmd4/arg.rs

sdmmc_core/command/class/class0/cmd4/
arg.rs
