sdmmc_core/command/class/class5/cmd36/
arg.rs

1use crate::lib_bitfield;
2use crate::result::{Error, Result};
3
4lib_bitfield! {
5    /// Argument for CMD36.
6    pub Argument(u32): u32 {
7        /// Sets the address of the last erase group to be erased.
8        pub data_address: 31, 0;
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    /// Converts a [`u32`] into an [`Argument`].
24    pub const fn from_bits(val: u32) -> Self {
25        Self(val)
26    }
27
28    /// Attempts to convert a [`u32`] into an [`Argument`].
29    pub const fn try_from_bits(val: u32) -> Result<Self> {
30        Ok(Self::from_bits(val))
31    }
32
33    /// Converts the [Argument] into a byte array.
34    pub const fn bytes(&self) -> [u8; Self::LEN] {
35        self.0.to_be_bytes()
36    }
37
38    /// Attempts to convert a byte slice into an [`Argument`].
39    pub const fn try_from_bytes(val: &[u8]) -> Result<Self> {
40        match val.len() {
41            len if len < Self::LEN => Err(Error::invalid_length(len, Self::LEN)),
42            _ => Self::try_from_bits(u32::from_be_bytes([val[0], val[1], val[2], val[3]])),
43        }
44    }
45}
46
47impl Default for Argument {
48    fn default() -> Self {
49        Self::new()
50    }
51}
52
53impl From<Argument> for u32 {
54    fn from(val: Argument) -> Self {
55        val.bits()
56    }
57}
58
59impl From<Argument> for [u8; Argument::LEN] {
60    fn from(val: Argument) -> Self {
61        val.bytes()
62    }
63}
64
65impl TryFrom<u32> for Argument {
66    type Error = Error;
67
68    fn try_from(val: u32) -> Result<Self> {
69        Self::try_from_bits(val)
70    }
71}
72
73impl TryFrom<&[u8]> for Argument {
74    type Error = Error;
75
76    fn try_from(val: &[u8]) -> Result<Self> {
77        Self::try_from_bytes(val)
78    }
79}
80
81impl<const N: usize> TryFrom<&[u8; N]> for Argument {
82    type Error = Error;
83
84    fn try_from(val: &[u8; N]) -> Result<Self> {
85        Self::try_from_bytes(val.as_ref())
86    }
87}
88
89impl<const N: usize> TryFrom<[u8; N]> for Argument {
90    type Error = Error;
91
92    fn try_from(val: [u8; N]) -> Result<Self> {
93        Self::try_from_bytes(val.as_ref())
94    }
95}
96
97#[cfg(test)]
98mod tests {
99    use super::*;
100
101    #[test]
102    fn test_fields() {
103        (1..=u32::BITS)
104            .map(|r| ((1u64 << r) - 1) as u32)
105            .for_each(|raw_arg| {
106                let raw = raw_arg.to_be_bytes();
107                let exp_addr = raw_arg;
108                let mut exp_arg = Argument(raw_arg);
109
110                assert_eq!(Argument::try_from_bits(raw_arg), Ok(exp_arg));
111                assert_eq!(Argument::try_from_bytes(raw.as_ref()), Ok(exp_arg));
112                assert_eq!(Argument::try_from(raw_arg), Ok(exp_arg));
113                assert_eq!(Argument::try_from(raw), Ok(exp_arg));
114                assert_eq!(Argument::try_from(&raw), Ok(exp_arg));
115
116                assert_eq!(exp_arg.bits(), raw_arg);
117                assert_eq!(exp_arg.bytes(), raw);
118
119                assert_eq!(exp_arg.data_address(), exp_addr);
120
121                exp_arg.set_data_address(0);
122                assert_eq!(exp_arg.data_address(), 0);
123
124                exp_arg.set_data_address(exp_addr);
125                assert_eq!(exp_arg.data_address(), exp_addr);
126            });
127    }
128}
sdmmc_core/command/class/class5/cmd36/arg.rs

sdmmc_core/command/class/class5/cmd36/
arg.rs
