py32-hal 0.4.0

HAL and Embassy support for the Py32 family of microcontrollers
Documentation 
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

//! Direct Memory Access (DMA)

// The following code is modified from embassy-stm32
// https://github.com/embassy-rs/embassy/tree/main/embassy-stm32
// Special thanks to the Embassy Project and its contributors for their work!

#![macro_use]

mod dma;
pub use dma::*;

mod util;
pub(crate) use util::*;

pub(crate) mod ringbuffer;
pub mod word;

use embassy_hal_internal::{impl_peripheral, Peripheral};

use crate::interrupt;

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
enum Dir {
    MemoryToPeripheral,
    PeripheralToMemory,
}

/// DMA request type alias. (also known as DMA channel number in some chips)
pub type Request = u8;
// pub type Request = ();

pub(crate) trait SealedChannel {
    fn id(&self) -> u8;
}

pub(crate) trait ChannelInterrupt {
    #[cfg_attr(not(feature = "rt"), allow(unused))]
    unsafe fn on_irq();
}

/// DMA channel.
#[allow(private_bounds)]
pub trait Channel: SealedChannel + Peripheral<P = Self> + Into<AnyChannel> + 'static {
    /// Type-erase (degrade) this pin into an `AnyChannel`.
    ///
    /// This converts DMA channel singletons (`DMA1_CH3`, `DMA2_CH1`, ...), which
    /// are all different types, into the same type. It is useful for
    /// creating arrays of channels, or avoiding generics.
    #[inline]
    fn degrade(self) -> AnyChannel {
        AnyChannel { id: self.id() }
    }
}

macro_rules! dma_channel_impl {
    ($channel_peri:ident, $index:expr) => {
        impl crate::dma::SealedChannel for crate::peripherals::$channel_peri {
            fn id(&self) -> u8 {
                $index
            }
        }
        impl crate::dma::ChannelInterrupt for crate::peripherals::$channel_peri {
            unsafe fn on_irq() {
                crate::dma::AnyChannel { id: $index }.on_irq();
            }
        }

        impl crate::dma::Channel for crate::peripherals::$channel_peri {}

        impl From<crate::peripherals::$channel_peri> for crate::dma::AnyChannel {
            fn from(x: crate::peripherals::$channel_peri) -> Self {
                crate::dma::Channel::degrade(x)
            }
        }
    };
}

/// Type-erased DMA channel.
pub struct AnyChannel {
    pub(crate) id: u8,
}
impl_peripheral!(AnyChannel);

impl AnyChannel {
    fn info(&self) -> &ChannelInfo {
        &crate::_generated::DMA_CHANNELS[self.id as usize]
    }
}

impl SealedChannel for AnyChannel {
    fn id(&self) -> u8 {
        self.id
    }
}
impl Channel for AnyChannel {}

const CHANNEL_COUNT: usize = crate::_generated::DMA_CHANNELS.len();
static STATE: [ChannelState; CHANNEL_COUNT] = [ChannelState::NEW; CHANNEL_COUNT];

/// "No DMA" placeholder.
///
/// You may pass this in place of a real DMA channel when creating a driver
/// to indicate it should not use DMA.
///
/// This often causes async functionality to not be available on the instance,
/// leaving only blocking functionality.
pub struct NoDma;

impl_peripheral!(NoDma);

// safety: must be called only once at startup
pub(crate) unsafe fn init(
    cs: critical_section::CriticalSection,
    dma_priority: interrupt::Priority,
) {
    dma::init(cs, dma_priority);
}