sdmmc_core/command/class/class0/cmd7/
arg.rs

1use crate::lib_bitfield;
2use crate::result::{Error, Result};
3
4lib_bitfield! {
5    /// Argumentument for CMD7.
6    pub Argument(u32): u16 {
7        /// Programs the RCA value for card select on the CMD line.
8        raw_rca: 31, 16;
9    }
10}
11
12impl Argument {
13    /// Represents the byte length of the [Argument].
14    pub const LEN: usize = 4;
15    /// Represents the raw 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 `RCA` field for the card select on the CMD line.
24    pub const fn rca(&self) -> u16 {
25        self.raw_rca()
26    }
27
28    /// Sets the `RCA` field for the card select on the CMD line.
29    pub fn set_rca(&mut self, val: u16) {
30        self.set_raw_rca(val as u32)
31    }
32
33    /// Converts a [`u32`] into an [Argument].
34    pub const fn from_bits(val: u32) -> Self {
35        Self(val)
36    }
37
38    /// Attempts to convert a [`u32`] into an [Argument].
39    pub const fn try_from_bits(val: u32) -> Result<Self> {
40        Ok(Self::from_bits(val))
41    }
42
43    /// Converts the [Argument] into a byte array.
44    pub const fn bytes(&self) -> [u8; Self::LEN] {
45        self.0.to_be_bytes()
46    }
47
48    /// Attempts to convert a byte slice into an [Argument].
49    pub const fn try_from_bytes(val: &[u8]) -> Result<Self> {
50        match val.len() {
51            len if len < Self::LEN => Err(Error::invalid_length(len, Self::LEN)),
52            _ => Ok(Self::from_bits(u32::from_be_bytes([
53                val[0], val[1], val[2], val[3],
54            ]))),
55        }
56    }
57}
58
59impl Default for Argument {
60    fn default() -> Self {
61        Self::new()
62    }
63}
64
65impl From<u32> for Argument {
66    fn from(val: u32) -> Self {
67        Self::from_bits(val)
68    }
69}
70
71impl From<Argument> for u32 {
72    fn from(val: Argument) -> Self {
73        val.bits()
74    }
75}
76
77impl From<Argument> for [u8; Argument::LEN] {
78    fn from(val: Argument) -> Self {
79        val.bytes()
80    }
81}
82
83impl TryFrom<&[u8]> for Argument {
84    type Error = Error;
85
86    fn try_from(val: &[u8]) -> Result<Self> {
87        Self::try_from_bytes(val)
88    }
89}
90
91impl<const N: usize> TryFrom<&[u8; N]> for Argument {
92    type Error = Error;
93
94    fn try_from(val: &[u8; N]) -> Result<Self> {
95        Self::try_from_bytes(val.as_ref())
96    }
97}
98
99impl<const N: usize> TryFrom<[u8; N]> for Argument {
100    type Error = Error;
101
102    fn try_from(val: [u8; N]) -> Result<Self> {
103        Self::try_from_bytes(val.as_ref())
104    }
105}
106
107#[cfg(test)]
108mod tests {
109    use super::*;
110
111    #[test]
112    fn test_fields() {
113        (1..=u16::BITS)
114            .map(|r| ((1u32 << r) - 1) as u16)
115            .for_each(|rca| {
116                let raw = (rca as u32) << 16;
117                let raw_bytes = raw.to_be_bytes();
118
119                let mut exp_arg = Argument(raw);
120
121                assert_eq!(Argument::try_from_bits(raw), Ok(exp_arg));
122                assert_eq!(Argument::from_bits(raw), exp_arg);
123                assert_eq!(Argument::from(raw), exp_arg);
124
125                assert_eq!(Argument::try_from_bytes(&raw_bytes), Ok(exp_arg));
126                assert_eq!(Argument::try_from(raw_bytes), Ok(exp_arg));
127                assert_eq!(Argument::try_from(&raw_bytes), Ok(exp_arg));
128
129                assert_eq!(exp_arg.bytes(), raw_bytes);
130                assert_eq!(<[u8; Argument::LEN]>::from(exp_arg), raw_bytes);
131
132                assert_eq!(exp_arg.rca(), rca);
133
134                exp_arg.set_rca(0);
135                assert_eq!(exp_arg.rca(), 0);
136
137                exp_arg.set_rca(rca);
138                assert_eq!(exp_arg.rca(), rca);
139            });
140    }
141}
sdmmc_core/command/class/class0/cmd7/arg.rs

sdmmc_core/command/class/class0/cmd7/
arg.rs
