embedded_sdmmc/
structure.rs
1macro_rules! access_field {
4 ($self:expr, $offset:expr, $start_bit:expr, 1) => {
5 ($self.data[$offset] & (1 << $start_bit)) != 0
6 };
7 ($self:expr, $offset:expr, $start:expr, $num_bits:expr) => {
8 ($self.data[$offset] >> $start) & (((1u16 << $num_bits) - 1) as u8)
9 };
10}
11
12macro_rules! define_field {
13 ($name:ident, bool, $offset:expr, $bit:expr) => {
14 pub fn $name(&self) -> bool {
16 access_field!(self, $offset, $bit, 1)
17 }
18 };
19 ($name:ident, u8, $offset:expr, $start_bit:expr, $num_bits:expr) => {
20 pub fn $name(&self) -> u8 {
22 access_field!(self, $offset, $start_bit, $num_bits)
23 }
24 };
25 ($name:ident, $type:ty, [ $( ( $offset:expr, $start_bit:expr, $num_bits:expr ) ),+ ]) => {
26 pub fn $name(&self) -> $type {
28 let mut result = 0;
29 $(
30 result <<= $num_bits;
31 let part = access_field!(self, $offset, $start_bit, $num_bits) as $type;
32 result |= part;
33 )+
34 result
35 }
36 };
37
38 ($name:ident, u8, $offset:expr) => {
39 pub fn $name(&self) -> u8 {
41 self.data[$offset]
42 }
43 };
44
45 ($name:ident, u16, $offset:expr) => {
46 pub fn $name(&self) -> u16 {
48 LittleEndian::read_u16(&self.data[$offset..$offset+2])
49 }
50 };
51
52 ($name:ident, u32, $offset:expr) => {
53 pub fn $name(&self) -> u32 {
55 LittleEndian::read_u32(&self.data[$offset..$offset+4])
56 }
57 };
58}
59
60