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//! Direct Memory Access (DMA)
#![macro_use]
#[cfg(any(bdma, dma))]
mod dma_bdma;
#[cfg(any(bdma, dma))]
pub use dma_bdma::*;
#[cfg(gpdma)]
pub(crate) mod gpdma;
#[cfg(gpdma)]
pub use gpdma::ringbuffered::*;
#[cfg(gpdma)]
pub use gpdma::*;
#[cfg(dmamux)]
mod dmamux;
#[cfg(dmamux)]
pub(crate) use dmamux::*;
mod util;
pub(crate) use util::*;
pub(crate) mod ringbuffer;
pub mod word;
use embassy_hal_internal::{impl_peripheral, PeripheralType};
use crate::interrupt;
/// The direction of a DMA transfer.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum Dir {
/// Transfer from memory to a peripheral.
MemoryToPeripheral,
/// Transfer from a peripheral to memory.
PeripheralToMemory,
}
/// DMA request type alias. (also known as DMA channel number in some chips)
#[cfg(any(dma_v2, bdma_v2, gpdma, dmamux))]
pub type Request = u8;
/// DMA request type alias. (also known as DMA channel number in some chips)
#[cfg(not(any(dma_v2, bdma_v2, gpdma, dmamux)))]
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 + PeripheralType + Into<AnyChannel> + 'static {}
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::$channel_peri> for crate::dma::AnyChannel {
fn from(val: crate::peripherals::$channel_peri) -> Self {
Self {
id: crate::dma::SealedChannel::id(&val),
}
}
}
};
}
/// 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];
// safety: must be called only once at startup
pub(crate) unsafe fn init(
cs: critical_section::CriticalSection,
#[cfg(bdma)] bdma_priority: interrupt::Priority,
#[cfg(dma)] dma_priority: interrupt::Priority,
#[cfg(gpdma)] gpdma_priority: interrupt::Priority,
) {
#[cfg(any(dma, bdma))]
dma_bdma::init(
cs,
#[cfg(dma)]
dma_priority,
#[cfg(bdma)]
bdma_priority,
);
#[cfg(gpdma)]
gpdma::init(cs, gpdma_priority);
#[cfg(dmamux)]
dmamux::init(cs);
}
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