sdmmc_core/command/class/class9/cmd39/
arg.rs

1use crate::lib_bitfield;
2use crate::result::{Error, Result};
3
4lib_bitfield! {
5    /// Argument for CMD39.
6    pub Argument(u32): u16 {
7        raw_rca: 31, 16;
8        /// Indicates whether to write to (`true`) or read from (`false`) the register.
9        pub register_write_flag: 15;
10        raw_register_address: 14, 8;
11        raw_register_data: 7, 0;
12    }
13}
14
15impl Argument {
16    /// Represents the byte length of the [Argument].
17    pub const LEN: usize = 4;
18    /// Represents the default value of the [Argument].
19    pub const DEFAULT: u32 = 0;
20
21    /// Creates a new [Argument].
22    pub const fn new() -> Self {
23        Self(Self::DEFAULT)
24    }
25
26    /// Gets the `RCA` field of the [Argument].
27    pub const fn rca(&self) -> u16 {
28        self.raw_rca()
29    }
30
31    /// Sets the `RCA` field of the [Argument].
32    pub fn set_rca(&mut self, val: u16) {
33        self.set_raw_rca(val as u32);
34    }
35
36    /// Gets the card register address field of the [Argument].
37    pub const fn register_address(&self) -> u8 {
38        self.raw_register_address() as u8
39    }
40
41    /// Sets the card register address field of the [Argument].
42    pub fn set_register_address(&mut self, val: u8) {
43        self.set_raw_register_address(val as u32);
44    }
45
46    /// Gets the card register data field of the [Argument].
47    pub const fn register_data(&self) -> u8 {
48        self.raw_register_data() as u8
49    }
50
51    /// Sets the card register data field of the [Argument].
52    pub fn set_register_data(&mut self, val: u8) {
53        self.set_raw_register_data(val as u32);
54    }
55
56    /// Converts a [`u32`] into an [`Argument`].
57    pub const fn from_bits(val: u32) -> Self {
58        Self(val)
59    }
60
61    /// Attempts to convert a [`u32`] into an [`Argument`].
62    pub const fn try_from_bits(val: u32) -> Result<Self> {
63        Ok(Self::from_bits(val))
64    }
65
66    /// Converts the [Argument] into a byte array.
67    pub const fn bytes(&self) -> [u8; Self::LEN] {
68        self.0.to_be_bytes()
69    }
70
71    /// Attempts to convert a byte slice into an [`Argument`].
72    pub const fn try_from_bytes(val: &[u8]) -> Result<Self> {
73        match val.len() {
74            len if len < Self::LEN => Err(Error::invalid_length(len, Self::LEN)),
75            _ => Self::try_from_bits(u32::from_be_bytes([val[0], val[1], val[2], val[3]])),
76        }
77    }
78}
79
80impl Default for Argument {
81    fn default() -> Self {
82        Self::new()
83    }
84}
85
86impl From<Argument> for u32 {
87    fn from(val: Argument) -> Self {
88        val.bits()
89    }
90}
91
92impl From<Argument> for [u8; Argument::LEN] {
93    fn from(val: Argument) -> Self {
94        val.bytes()
95    }
96}
97
98impl TryFrom<u32> for Argument {
99    type Error = Error;
100
101    fn try_from(val: u32) -> Result<Self> {
102        Self::try_from_bits(val)
103    }
104}
105
106impl TryFrom<&[u8]> for Argument {
107    type Error = Error;
108
109    fn try_from(val: &[u8]) -> Result<Self> {
110        Self::try_from_bytes(val)
111    }
112}
113
114impl<const N: usize> TryFrom<&[u8; N]> for Argument {
115    type Error = Error;
116
117    fn try_from(val: &[u8; N]) -> Result<Self> {
118        Self::try_from_bytes(val.as_ref())
119    }
120}
121
122impl<const N: usize> TryFrom<[u8; N]> for Argument {
123    type Error = Error;
124
125    fn try_from(val: [u8; N]) -> Result<Self> {
126        Self::try_from_bytes(val.as_ref())
127    }
128}
129
130#[cfg(test)]
131mod tests {
132    use super::*;
133
134    #[test]
135    fn test_fields() {
136        (1..=u32::BITS)
137            .map(|r| ((1u64 << r) - 1) as u32)
138            .for_each(|raw_arg| {
139                let raw = raw_arg.to_be_bytes();
140                let mut exp_arg = Argument(raw_arg);
141
142                let exp_rca = (raw_arg >> 16) as u16;
143                let exp_write_flag = (raw_arg & (1 << 15)) != 0;
144                let exp_addr = ((raw_arg & 0x7f00) >> 8) as u8;
145                let exp_data = (raw_arg & 0xff) as u8;
146
147                assert_eq!(Argument::try_from_bits(raw_arg), Ok(exp_arg));
148                assert_eq!(Argument::try_from_bytes(raw.as_ref()), Ok(exp_arg));
149                assert_eq!(Argument::try_from(raw_arg), Ok(exp_arg));
150                assert_eq!(Argument::try_from(raw), Ok(exp_arg));
151                assert_eq!(Argument::try_from(&raw), Ok(exp_arg));
152
153                assert_eq!(exp_arg.bits(), raw_arg);
154                assert_eq!(exp_arg.bytes(), raw);
155
156                assert_eq!(exp_arg.rca(), exp_rca);
157
158                exp_arg.set_rca(0);
159                assert_eq!(exp_arg.rca(), 0);
160
161                exp_arg.set_rca(exp_rca);
162                assert_eq!(exp_arg.rca(), exp_rca);
163
164                assert_eq!(exp_arg.register_write_flag(), exp_write_flag);
165
166                test_field!(exp_arg, register_write_flag: 15);
167
168                assert_eq!(exp_arg.register_address(), exp_addr);
169
170                exp_arg.set_register_address(0);
171                assert_eq!(exp_arg.register_address(), 0);
172
173                exp_arg.set_register_address(exp_addr);
174                assert_eq!(exp_arg.register_address(), exp_addr);
175
176                assert_eq!(exp_arg.register_data(), exp_data);
177
178                exp_arg.set_register_data(0);
179                assert_eq!(exp_arg.register_data(), 0);
180
181                exp_arg.set_register_data(exp_data);
182                assert_eq!(exp_arg.register_data(), exp_data);
183            });
184    }
185}
sdmmc_core/command/class/class9/cmd39/arg.rs

sdmmc_core/command/class/class9/cmd39/
arg.rs
