1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

use embedded_hal_02::blocking;

/// Wrapper that implements async traits using blocking implementations.
///
/// This allows driver writers to depend on the async traits while still supporting embedded-hal peripheral implementations.
///
/// BlockingAsync will implement any async trait that maps to embedded-hal traits implemented for the wrapped driver.
///
/// Driver users are then free to choose which implementation that is available to them.
pub struct BlockingAsync<T> {
    wrapped: T,
}

impl<T> BlockingAsync<T> {
    /// Create a new instance of a wrapper for a given peripheral.
    pub fn new(wrapped: T) -> Self {
        Self { wrapped }
    }
}

//
// I2C implementations
//
impl<T, E> embedded_hal_1::i2c::ErrorType for BlockingAsync<T>
where
    E: embedded_hal_1::i2c::Error + 'static,
    T: blocking::i2c::WriteRead<Error = E> + blocking::i2c::Read<Error = E> + blocking::i2c::Write<Error = E>,
{
    type Error = E;
}

impl<T, E> embedded_hal_async::i2c::I2c for BlockingAsync<T>
where
    E: embedded_hal_1::i2c::Error + 'static,
    T: blocking::i2c::WriteRead<Error = E> + blocking::i2c::Read<Error = E> + blocking::i2c::Write<Error = E>,
{
    async fn read(&mut self, address: u8, read: &mut [u8]) -> Result<(), Self::Error> {
        self.wrapped.read(address, read)
    }

    async fn write(&mut self, address: u8, write: &[u8]) -> Result<(), Self::Error> {
        self.wrapped.write(address, write)
    }

    async fn write_read(&mut self, address: u8, write: &[u8], read: &mut [u8]) -> Result<(), Self::Error> {
        self.wrapped.write_read(address, write, read)
    }

    async fn transaction(
        &mut self,
        address: u8,
        operations: &mut [embedded_hal_1::i2c::Operation<'_>],
    ) -> Result<(), Self::Error> {
        let _ = address;
        let _ = operations;
        todo!()
    }
}

//
// SPI implementatinos
//

impl<T, E> embedded_hal_async::spi::ErrorType for BlockingAsync<T>
where
    E: embedded_hal_1::spi::Error,
    T: blocking::spi::Transfer<u8, Error = E> + blocking::spi::Write<u8, Error = E>,
{
    type Error = E;
}

impl<T, E> embedded_hal_async::spi::SpiBus<u8> for BlockingAsync<T>
where
    E: embedded_hal_1::spi::Error + 'static,
    T: blocking::spi::Transfer<u8, Error = E> + blocking::spi::Write<u8, Error = E>,
{
    async fn flush(&mut self) -> Result<(), Self::Error> {
        Ok(())
    }

    async fn write(&mut self, data: &[u8]) -> Result<(), Self::Error> {
        self.wrapped.write(data)?;
        Ok(())
    }

    async fn read(&mut self, data: &mut [u8]) -> Result<(), Self::Error> {
        self.wrapped.transfer(data)?;
        Ok(())
    }

    async fn transfer(&mut self, read: &mut [u8], write: &[u8]) -> Result<(), Self::Error> {
        // Ensure we write the expected bytes
        for i in 0..core::cmp::min(read.len(), write.len()) {
            read[i] = write[i].clone();
        }
        self.wrapped.transfer(read)?;
        Ok(())
    }

    async fn transfer_in_place(&mut self, data: &mut [u8]) -> Result<(), Self::Error> {
        self.wrapped.transfer(data)?;
        Ok(())
    }
}

/// NOR flash wrapper
use embedded_storage::nor_flash::{ErrorType, NorFlash, ReadNorFlash};
use embedded_storage_async::nor_flash::{NorFlash as AsyncNorFlash, ReadNorFlash as AsyncReadNorFlash};

impl<T> ErrorType for BlockingAsync<T>
where
    T: ErrorType,
{
    type Error = T::Error;
}

impl<T> AsyncNorFlash for BlockingAsync<T>
where
    T: NorFlash,
{
    const WRITE_SIZE: usize = <T as NorFlash>::WRITE_SIZE;
    const ERASE_SIZE: usize = <T as NorFlash>::ERASE_SIZE;

    async fn write(&mut self, offset: u32, data: &[u8]) -> Result<(), Self::Error> {
        self.wrapped.write(offset, data)
    }

    async fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
        self.wrapped.erase(from, to)
    }
}

impl<T> AsyncReadNorFlash for BlockingAsync<T>
where
    T: ReadNorFlash,
{
    const READ_SIZE: usize = <T as ReadNorFlash>::READ_SIZE;
    async fn read(&mut self, address: u32, data: &mut [u8]) -> Result<(), Self::Error> {
        self.wrapped.read(address, data)
    }

    fn capacity(&self) -> usize {
        self.wrapped.capacity()
    }
}