[DMA 7/8]: Remove Dma, move channels to Peripherals (#2545)

* Move DMA channels into Peripherals

* Initialize DMA in the critical section needed for clock management

* Update esp-hal/MIGRATING-0.22.md

Co-authored-by: Jesse Braham <jessebraham@users.noreply.github.com>

---------

Co-authored-by: Jesse Braham <jessebraham@users.noreply.github.com>

esp-hal/CHANGELOG.md

@@ -23,7 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
-- DMA channel objects now implement `Peripheral` (#2526)
+- In addition to taking by value, peripheral drivers can now mutably borrow DMA channel objects. (#2526)
 - DMA channel objects are no longer wrapped in `Channel`. The `Channel` drivers are now managed by DMA enabled peripheral drivers. (#2526)
 - The `Dpi` driver and `DpiTransfer` now have a `Mode` type parameter. The driver's asyncness is determined by the asyncness of the `Lcd` used to create it. (#2526)
 - `dma::{Channel, ChannelRx, ChannelTx}::set_priority` for GDMA devices (#2403)
@@ -35,6 +35,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `SystemTimer`s `Alarm`s are now type erased (#2576)
 - `TimerGroup` `Timer`s are now type erased (#2581)
 - PSRAM is now initialized automatically if `quad-psram` or `octal-psram` is enabled (#2546)
+- DMA channels are now available via the `Peripherals` struct, and have been renamed accordingly. (#2545)
 
 ### Fixed
 
@@ -46,6 +47,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `SysTimerAlarms` has been removed, alarms are now part of the `SystemTimer` struct (#2576)
 - `FrozenUnit`, `AnyUnit`, `SpecificUnit`, `SpecificComparator`, `AnyComparator` have been removed from `systimer` (#2576)
 - `esp_hal::psram::psram_range` (#2546)
+- The `Dma` structure has been removed. (#2545)
 
 ## [0.22.0] - 2024-11-20
 

esp-hal/MIGRATING-0.22.md

@@ -2,6 +2,20 @@
 
 ## DMA changes
 
+### Accessing channel objects
+
+DMA channels are now available through the `Peripherals` struct, which is returned
+by `esp_hal::init()`. The channels themselves have been renamed to match other peripheral singletons.
+
+- ESP32-C2, C3, C6, H2 and S3: `channelX -> DMA_CHX`
+- ESP32 and S2: `spiXchannel -> DMA_SPIX`, `i2sXchannel -> DMA_I2SX`
+
+```diff
+-let dma = Dma::new(peripherals.DMA);
+-let channel = dma.channel2;
++let channel = peripherals.DMA_CH2;
+```
+
 ### Configuration changes
 
 - `configure_for_async` and `configure` have been removed

esp-hal/src/dma/gdma.rs

@@ -14,13 +14,14 @@
 //!
 //! <em>PS: Note that the number of DMA channels is chip-specific.</em>
 
+use critical_section::CriticalSection;
+
 use crate::{
     dma::*,
     interrupt::Priority,
     macros::handler,
     peripheral::{Peripheral, PeripheralRef},
     peripherals::Interrupt,
-    system::{self, PeripheralClockControl},
 };
 
 /// An arbitrary GDMA channel
@@ -776,53 +777,10 @@ crate::impl_dma_eligible! {
     }
 }
 
-/// GDMA Peripheral
+pub(super) fn init_dma(_cs: CriticalSection<'_>) {
-///
+    let dma = unsafe { crate::soc::peripherals::DMA::steal() };
-/// This offers the available DMA channels.
-pub struct Dma<'d> {
-    _inner: PeripheralRef<'d, crate::peripherals::DMA>,
-    /// Channel 0
-    pub channel0: DmaChannel0,
-    /// Channel 1
-    #[cfg(not(esp32c2))]
-    pub channel1: DmaChannel1,
-    /// Channel 2
-    #[cfg(not(esp32c2))]
-    pub channel2: DmaChannel2,
-    /// Channel 3
-    #[cfg(esp32s3)]
-    pub channel3: DmaChannel3,
-    /// Channel 4
-    #[cfg(esp32s3)]
-    pub channel4: DmaChannel4,
-}
-
-impl<'d> Dma<'d> {
-    /// Create a DMA instance.
-    pub fn new(dma: impl Peripheral<P = crate::peripherals::DMA> + 'd) -> Dma<'d> {
-        crate::into_ref!(dma);
-
-        if PeripheralClockControl::enable(system::Peripheral::Gdma) {
-            PeripheralClockControl::reset(system::Peripheral::Gdma);
-        }
     dma.misc_conf().modify(|_, w| w.ahbm_rst_inter().set_bit());
     dma.misc_conf()
         .modify(|_, w| w.ahbm_rst_inter().clear_bit());
     dma.misc_conf().modify(|_, w| w.clk_en().set_bit());
-
-        unsafe {
-            Dma {
-                _inner: dma,
-                channel0: DmaChannel0::steal(),
-                #[cfg(not(esp32c2))]
-                channel1: DmaChannel1::steal(),
-                #[cfg(not(esp32c2))]
-                channel2: DmaChannel2::steal(),
-                #[cfg(esp32s3)]
-                channel3: DmaChannel3::steal(),
-                #[cfg(esp32s3)]
-                channel4: DmaChannel4::steal(),
-            }
-        }
-    }
 }

esp-hal/src/dma/mod.rs

@@ -19,10 +19,8 @@
 #![doc = crate::before_snippet!()]
 //! # use esp_hal::dma_buffers;
 //! # use esp_hal::spi::{master::{Config, Spi}, SpiMode};
-//! # use esp_hal::dma::Dma;
+#![cfg_attr(pdma, doc = "let dma_channel = peripherals.DMA_SPI2;")]
-//! let dma = Dma::new(peripherals.DMA);
+#![cfg_attr(gdma, doc = "let dma_channel = peripherals.DMA_CH0;")]
-#![cfg_attr(any(esp32, esp32s2), doc = "let dma_channel = dma.spi2channel;")]
-#![cfg_attr(not(any(esp32, esp32s2)), doc = "let dma_channel = dma.channel0;")]
 //! let sclk = peripherals.GPIO0;
 //! let miso = peripherals.GPIO2;
 //! let mosi = peripherals.GPIO4;
@@ -70,6 +68,7 @@ use crate::{
     peripheral::{Peripheral, PeripheralRef},
     peripherals::Interrupt,
     soc::is_slice_in_dram,
+    system,
     Async,
     Blocking,
     Cpu,
@@ -1665,7 +1664,7 @@ impl<DEG: DmaChannel> DmaChannelConvert<DEG> for DEG {
 #[cfg_attr(pdma, doc = "")]
 #[cfg_attr(
     pdma,
-    doc = "Note that using mismatching channels (e.g. trying to use `spi2channel` with SPI3) may compile, but will panic in runtime."
+    doc = "Note that using mismatching channels (e.g. trying to use `DMA_SPI2` with SPI3) may compile, but will panic in runtime."
 )]
 #[cfg_attr(pdma, doc = "")]
 /// ## Example
@@ -1679,7 +1678,6 @@ impl<DEG: DmaChannel> DmaChannelConvert<DEG> for DEG {
 /// use esp_hal::dma::DmaChannelFor;
 /// use esp_hal::peripheral::Peripheral;
 /// use esp_hal::Blocking;
-/// use esp_hal::dma::Dma;
 ///
 /// fn configures_spi_dma<'d, S, CH>(
 ///     spi: Spi<'d, Blocking, S>,
@@ -1691,10 +1689,8 @@ impl<DEG: DmaChannel> DmaChannelConvert<DEG> for DEG {
 ///  {
 ///     spi.with_dma(channel)
 /// }
-///
+#[cfg_attr(pdma, doc = "let dma_channel = peripherals.DMA_SPI2;")]
-/// let dma = Dma::new(peripherals.DMA);
+#[cfg_attr(gdma, doc = "let dma_channel = peripherals.DMA_CH0;")]
-#[cfg_attr(pdma, doc = "let dma_channel = dma.spi2channel;")]
-#[cfg_attr(gdma, doc = "let dma_channel = dma.channel0;")]
 #[doc = ""]
 /// let spi = Spi::new_with_config(
 ///     peripherals.SPI2,
@@ -1802,6 +1798,21 @@ pub trait Rx: crate::private::Sealed {
     fn waker(&self) -> &'static crate::asynch::AtomicWaker;
 }
 
+// NOTE(p4): because the P4 has two different GDMAs, we won't be able to use
+// `GenericPeripheralGuard`.
+cfg_if::cfg_if! {
+    if #[cfg(pdma)] {
+        type PeripheralGuard = system::GenericPeripheralGuard<{ system::Peripheral::Dma as u8}>;
+    } else {
+        type PeripheralGuard = system::GenericPeripheralGuard<{ system::Peripheral::Gdma as u8}>;
+    }
+}
+
+fn create_guard(_ch: &impl RegisterAccess) -> PeripheralGuard {
+    // NOTE(p4): this function will read the channel's DMA peripheral from `_ch`
+    system::GenericPeripheralGuard::new_with(init_dma)
+}
+
 // DMA receive channel
 #[non_exhaustive]
 #[doc(hidden)]
@@ -1812,6 +1823,7 @@ where
 {
     pub(crate) rx_impl: PeripheralRef<'a, CH>,
     pub(crate) _phantom: PhantomData<M>,
+    pub(crate) _guard: PeripheralGuard,
 }
 
 impl<'a, CH> ChannelRx<'a, Blocking, CH>
@@ -1821,6 +1833,9 @@ where
     /// Creates a new RX channel half.
     pub fn new(rx_impl: impl Peripheral<P = CH> + 'a) -> Self {
         crate::into_ref!(rx_impl);
+
+        let _guard = create_guard(&*rx_impl);
+
         #[cfg(gdma)]
         // clear the mem2mem mode to avoid failed DMA if this
         // channel was previously used for a mem2mem transfer.
@@ -1836,6 +1851,7 @@ where
         Self {
             rx_impl,
             _phantom: PhantomData,
+            _guard,
         }
     }
 
@@ -1848,6 +1864,7 @@ where
         ChannelRx {
             rx_impl: self.rx_impl,
             _phantom: PhantomData,
+            _guard: self._guard,
         }
     }
 
@@ -1878,6 +1895,7 @@ where
         ChannelRx {
             rx_impl: self.rx_impl,
             _phantom: PhantomData,
+            _guard: self._guard,
         }
     }
 }
@@ -2095,6 +2113,7 @@ where
 {
     pub(crate) tx_impl: PeripheralRef<'a, CH>,
     pub(crate) _phantom: PhantomData<M>,
+    pub(crate) _guard: PeripheralGuard,
 }
 
 impl<'a, CH> ChannelTx<'a, Blocking, CH>
@@ -2104,6 +2123,9 @@ where
     /// Creates a new TX channel half.
     pub fn new(tx_impl: impl Peripheral<P = CH> + 'a) -> Self {
         crate::into_ref!(tx_impl);
+
+        let _guard = create_guard(&*tx_impl);
+
         if let Some(interrupt) = tx_impl.peripheral_interrupt() {
             for cpu in Cpu::all() {
                 crate::interrupt::disable(cpu, interrupt);
@@ -2113,6 +2135,7 @@ where
         Self {
             tx_impl,
             _phantom: PhantomData,
+            _guard,
         }
     }
 
@@ -2125,6 +2148,7 @@ where
         ChannelTx {
             tx_impl: self.tx_impl,
             _phantom: PhantomData,
+            _guard: self._guard,
         }
     }
 
@@ -2155,6 +2179,7 @@ where
         ChannelTx {
             tx_impl: self.tx_impl,
             _phantom: PhantomData,
+            _guard: self._guard,
         }
     }
 }

esp-hal/src/dma/pdma.rs

@@ -11,6 +11,7 @@
 //! [SPI]: ../spi/index.html
 //! [I2S]: ../i2s/index.html
 
+use critical_section::CriticalSection;
 use portable_atomic::{AtomicBool, Ordering};
 
 use crate::{
@@ -20,7 +21,6 @@ use crate::{
     macros::handler,
     peripheral::{Peripheral, PeripheralRef},
     peripherals::Interrupt,
-    system::{self, PeripheralClockControl},
 };
 
 type SpiRegisterBlock = crate::peripherals::spi2::RegisterBlock;
@@ -876,29 +876,7 @@ crate::impl_dma_eligible!([I2s0DmaChannel] I2S0 => I2s0);
 #[cfg(i2s1)]
 crate::impl_dma_eligible!([I2s1DmaChannel] I2S1 => I2s1);
 
-/// DMA Peripheral
+pub(super) fn init_dma(_cs: CriticalSection<'_>) {
-///
-/// This offers the available DMA channels.
-pub struct Dma<'d> {
-    _inner: PeripheralRef<'d, crate::peripherals::DMA>,
-    /// DMA channel for SPI2
-    pub spi2channel: Spi2DmaChannel,
-    /// DMA channel for SPI3
-    pub spi3channel: Spi3DmaChannel,
-    /// DMA channel for I2S0
-    pub i2s0channel: I2s0DmaChannel,
-    /// DMA channel for I2S1
-    #[cfg(i2s1)]
-    pub i2s1channel: I2s1DmaChannel,
-}
-
-impl<'d> Dma<'d> {
-    /// Create a DMA instance.
-    pub fn new(dma: impl Peripheral<P = crate::peripherals::DMA> + 'd) -> Dma<'d> {
-        if PeripheralClockControl::enable(system::Peripheral::Dma) {
-            PeripheralClockControl::reset(system::Peripheral::Dma);
-        }
-
     #[cfg(esp32)]
     {
         // (only) on ESP32 we need to configure DPORT for the SPI DMA channels
@@ -906,22 +884,10 @@ impl<'d> Dma<'d> {
         // restrictive than necessary but we currently support the same
         // number of SPI peripherals as SPI DMA channels so it's not a big
         // deal.
-            let dport = unsafe { &*crate::peripherals::DPORT::PTR };
+        let dport = unsafe { crate::peripherals::DPORT::steal() };
-            dport.spi_dma_chan_sel().modify(|_, w| unsafe {
+        dport
-                w.spi2_dma_chan_sel().bits(1).spi3_dma_chan_sel().bits(2)
+            .spi_dma_chan_sel()
-            });
+            .modify(|_, w| unsafe { w.spi2_dma_chan_sel().bits(1).spi3_dma_chan_sel().bits(2) });
-        }
-
-        unsafe {
-            Dma {
-                _inner: dma.into_ref(),
-                spi2channel: Spi2DmaChannel::steal(),
-                spi3channel: Spi3DmaChannel::steal(),
-                i2s0channel: I2s0DmaChannel::steal(),
-                #[cfg(i2s1)]
-                i2s1channel: I2s1DmaChannel::steal(),
-            }
-        }
     }
 }
 

esp-hal/src/i2s/master.rs

@@ -31,10 +31,11 @@
 #![doc = crate::before_snippet!()]
 //! # use esp_hal::i2s::master::{I2s, Standard, DataFormat};
 //! # use esp_hal::dma_buffers;
-//! # use esp_hal::dma::Dma;
+#![cfg_attr(any(esp32, esp32s2), doc = "let dma_channel = peripherals.DMA_I2S0;")]
-//! let dma = Dma::new(peripherals.DMA);
+#![cfg_attr(
-#![cfg_attr(any(esp32, esp32s2), doc = "let dma_channel = dma.i2s0channel;")]
+    not(any(esp32, esp32s2)),
-#![cfg_attr(not(any(esp32, esp32s2)), doc = "let dma_channel = dma.channel0;")]
+    doc = "let dma_channel = peripherals.DMA_CH0;"
+)]
 //! let (mut rx_buffer, rx_descriptors, _, tx_descriptors) =
 //! dma_buffers!(0, 4 * 4092);
 //!

esp-hal/src/i2s/parallel.rs

@@ -39,7 +39,7 @@
 //!
 //! ```rust, no_run
 #![doc = crate::before_snippet!()]
-//! # use esp_hal::dma::{Dma, DmaTxBuf};
+//! # use esp_hal::dma::DmaTxBuf;
 //! # use esp_hal::dma_buffers;
 //! # use esp_hal::delay::Delay;
 //! # use esp_hal::i2s::parallel::{I2sParallel, TxEightBits};
@@ -48,8 +48,7 @@
 //! const BUFFER_SIZE: usize = 256;
 //!
 //! let delay = Delay::new();
-//! let dma = Dma::new(peripherals.DMA);
+//! let dma_channel = peripherals.DMA_I2S1;
-//! let dma_channel = dma.i2s1channel;
 //! let i2s = peripherals.I2S1;
 //! let clock = peripherals.GPIO25;
 //!

esp-hal/src/lcd_cam/cam.rs

@@ -19,10 +19,6 @@
 //! # use esp_hal::lcd_cam::{cam::{Camera, RxEightBits}, LcdCam};
 //! # use fugit::RateExtU32;
 //! # use esp_hal::dma_rx_stream_buffer;
-//! # use esp_hal::dma::Dma;
-//!
-//! # let dma = Dma::new(peripherals.DMA);
-//! # let channel = dma.channel0;
 //!
 //! # let dma_buf = dma_rx_stream_buffer!(20 * 1000, 1000);
 //!
@@ -44,7 +40,7 @@
 //! let lcd_cam = LcdCam::new(peripherals.LCD_CAM);
 //! let mut camera = Camera::new(
 //!     lcd_cam.cam,
-//!     channel,
+//!     peripherals.DMA_CH0,
 //!     data_pins,
 //!     20u32.MHz(),
 //! )

esp-hal/src/lcd_cam/lcd/dpi.rs

@@ -24,11 +24,8 @@
 //! #     }
 //! # };
 //! # use esp_hal::dma_loop_buffer;
-//! # use esp_hal::dma::{Dma, DmaPriority};
-//!
-//! # let dma = Dma::new(peripherals.DMA);
-//! # let channel = dma.channel0;
 //!
+//! # let channel = peripherals.DMA_CH0;
 //! # let mut dma_buf = dma_loop_buffer!(32);
 //!
 //! let lcd_cam = LcdCam::new(peripherals.LCD_CAM);

esp-hal/src/lcd_cam/lcd/i8080.rs

@@ -17,10 +17,7 @@
 #![doc = crate::before_snippet!()]
 //! # use esp_hal::lcd_cam::{LcdCam, lcd::i8080::{Config, I8080, TxEightBits}};
 //! # use esp_hal::dma_tx_buffer;
-//! # use esp_hal::dma::{Dma, DmaTxBuf};
+//! # use esp_hal::dma::DmaTxBuf;
-//!
-//! # let dma = Dma::new(peripherals.DMA);
-//! # let channel = dma.channel0;
 //!
 //! # let mut dma_buf = dma_tx_buffer!(32678).unwrap();
 //!
@@ -38,7 +35,7 @@
 //!
 //! let mut i8080 = I8080::new(
 //!     lcd_cam.lcd,
-//!     channel,
+//!     peripherals.DMA_CH0,
 //!     tx_pins,
 //!     20.MHz(),
 //!     Config::default(),

esp-hal/src/parl_io.rs

@@ -16,15 +16,13 @@
 //! ```rust, no_run
 #![doc = crate::before_snippet!()]
 //! # use esp_hal::delay::Delay;
-//! # use esp_hal::dma::Dma;
 //! # use esp_hal::dma_buffers;
 //! # use esp_hal::gpio::NoPin;
 //! # use esp_hal::parl_io::{BitPackOrder, ParlIoRxOnly, RxFourBits};
 //!
 //! // Initialize DMA buffer and descriptors for data reception
 //! let (rx_buffer, rx_descriptors, _, _) = dma_buffers!(32000, 0);
-//! let dma = Dma::new(peripherals.DMA);
+//! let dma_channel = peripherals.DMA_CH0;
-//! let dma_channel = dma.channel0;
 //!
 //! // Configure the 4-bit input pins and clock pin
 //! let mut rx_pins = RxFourBits::new(
@@ -74,14 +72,12 @@
 //! ```rust, no_run
 #![doc = crate::before_snippet!()]
 //! # use esp_hal::delay::Delay;
-//! # use esp_hal::dma::Dma;
 //! # use esp_hal::dma_buffers;
 //! # use esp_hal::parl_io::{BitPackOrder, ParlIoTxOnly, TxFourBits, SampleEdge, ClkOutPin, TxPinConfigWithValidPin};
 //!
 //! // Initialize DMA buffer and descriptors for data reception
 //! let (_, _, tx_buffer, tx_descriptors) = dma_buffers!(0, 32000);
-//! let dma = Dma::new(peripherals.DMA);
+//! let dma_channel = peripherals.DMA_CH0;
-//! let dma_channel = dma.channel0;
 //!
 //! // Configure the 4-bit input pins and clock pin
 //! let tx_pins = TxFourBits::new(

esp-hal/src/peripheral.rs

@@ -246,10 +246,15 @@ mod peripheral_macros {
             peripherals: [
                 $(
                     $name:ident <= $from_pac:tt $(($($interrupt:ident),*))?
-                ), *$(,)?
+                ),* $(,)?
             ],
             pins: [
                 $( ( $pin:literal, $($pin_tokens:tt)* ) )*
+            ],
+            dma_channels: [
+                $(
+                    $channel_name:ident : $channel_ty:path
+                ),* $(,)?
             ]
         ) => {
 
@@ -280,6 +285,11 @@ mod peripheral_macros {
                         #[doc = concat!("GPIO", stringify!($pin))]
                         pub [<GPIO $pin>]: $crate::gpio::GpioPin<$pin>,
                     )*
+
+                    $(
+                        #[doc = concat!(stringify!($channel_name), " DMA channel.")]
+                        pub $channel_name: $crate::dma::$channel_ty,
+                    )*
                 }
 
                 impl Peripherals {
@@ -313,6 +323,10 @@ mod peripheral_macros {
                             $(
                                 [<GPIO $pin>]: $crate::gpio::GpioPin::<$pin>::steal(),
                             )*
+
+                            $(
+                                $channel_name: $crate::dma::$channel_ty::steal(),
+                            )*
                         }
                     }
                 }

esp-hal/src/soc/esp32/peripherals.rs

@@ -30,7 +30,6 @@ crate::peripherals! {
         CPU_CTRL <= virtual,
         DAC1 <= virtual,
         DAC2 <= virtual,
-        DMA <= virtual,
         EFUSE <= EFUSE,
         FLASH_ENCRYPTION <= FLASH_ENCRYPTION,
         FRC_TIMER <= FRC_TIMER,
@@ -112,5 +111,11 @@ crate::peripherals! {
         (37, [Input, Analog, RtcIoInput])
         (38, [Input, Analog, RtcIoInput])
         (39, [Input, Analog, RtcIoInput])
+    ],
+    dma_channels: [
+        DMA_SPI2: Spi2DmaChannel,
+        DMA_SPI3: Spi3DmaChannel,
+        DMA_I2S0: I2s0DmaChannel,
+        DMA_I2S1: I2s1DmaChannel,
     ]
 }

esp-hal/src/soc/esp32c2/peripherals.rs

@@ -25,7 +25,6 @@ crate::peripherals! {
         APB_CTRL <= APB_CTRL,
         ASSIST_DEBUG <= ASSIST_DEBUG,
         BT <= virtual,
-        DMA <= DMA (DMA_CH0),
         ECC <= ECC,
         EFUSE <= EFUSE,
         EXTMEM <= EXTMEM,
@@ -72,5 +71,8 @@ crate::peripherals! {
         (18, [Input, Output])
         (19, [Input, Output])
         (20, [Input, Output] (0 => U0RXD) ())
+    ],
+    dma_channels: [
+        DMA_CH0: DmaChannel0,
     ]
 }

esp-hal/src/soc/esp32c3/peripherals.rs

@@ -27,7 +27,6 @@ crate::peripherals! {
         APB_CTRL <= APB_CTRL,
         ASSIST_DEBUG <= ASSIST_DEBUG,
         BT <= virtual,
-        DMA <= DMA (DMA_CH0,DMA_CH1,DMA_CH2),
         DS <= DS,
         EFUSE <= EFUSE,
         EXTMEM <= EXTMEM,
@@ -85,5 +84,10 @@ crate::peripherals! {
         (19, [Input, Output])
         (20, [Input, Output] (0 => U0RXD) ())
         (21, [Input, Output] () (0 => U0TXD))
+    ],
+    dma_channels: [
+        DMA_CH0: DmaChannel0,
+        DMA_CH1: DmaChannel1,
+        DMA_CH2: DmaChannel2,
     ]
 }

esp-hal/src/soc/esp32c6/peripherals.rs

@@ -26,7 +26,6 @@ crate::peripherals! {
         ASSIST_DEBUG <= ASSIST_DEBUG,
         ATOMIC <= ATOMIC,
         BT <= virtual,
-        DMA <= DMA (DMA_IN_CH0,DMA_IN_CH1,DMA_IN_CH2,DMA_OUT_CH0,DMA_OUT_CH1,DMA_OUT_CH2),
         DS <= DS,
         ECC <= ECC,
         EFUSE <= EFUSE,
@@ -130,5 +129,10 @@ crate::peripherals! {
         (28, [Input, Output] (0 => SPIHD) (0 => SPIHD))
         (29, [Input, Output] () (0 => SPICLK_MUX))
         (30, [Input, Output] (0 => SPID) (0 => SPID))
+    ],
+    dma_channels: [
+        DMA_CH0: DmaChannel0,
+        DMA_CH1: DmaChannel1,
+        DMA_CH2: DmaChannel2,
     ]
 }

esp-hal/src/soc/esp32h2/peripherals.rs

@@ -25,7 +25,6 @@ crate::peripherals! {
         AES <= AES,
         ASSIST_DEBUG <= ASSIST_DEBUG,
         BT <= virtual,
-        DMA <= DMA (DMA_IN_CH0,DMA_IN_CH1,DMA_IN_CH2,DMA_OUT_CH0,DMA_OUT_CH1,DMA_OUT_CH2),
         DS <= DS,
         ECC <= ECC,
         EFUSE <= EFUSE,
@@ -117,5 +116,10 @@ crate::peripherals! {
         (25, [Input, Output] () (2 => FSPICS3))
         (26, [Input, Output] () (2 => FSPICS4))
         (27, [Input, Output] () (2 => FSPICS5))
+    ],
+    dma_channels: [
+        DMA_CH0: DmaChannel0,
+        DMA_CH1: DmaChannel1,
+        DMA_CH2: DmaChannel2,
     ]
 }

esp-hal/src/soc/esp32s2/peripherals.rs

@@ -26,7 +26,6 @@ crate::peripherals! {
         AES <= AES,
         DAC1 <= virtual,
         DAC2 <= virtual,
-        DMA <= virtual,
         DEDICATED_GPIO <= DEDICATED_GPIO,
         DS <= DS,
         EFUSE <= EFUSE,
@@ -115,5 +114,10 @@ crate::peripherals! {
         (44, [Input, Output])
         (45, [Input, Output])
         (46, [Input, Output])
+    ],
+    dma_channels: [
+        DMA_SPI2: Spi2DmaChannel,
+        DMA_SPI3: Spi3DmaChannel,
+        DMA_I2S0: I2s0DmaChannel,
     ]
 }

esp-hal/src/soc/esp32s3/peripherals.rs

@@ -28,7 +28,6 @@ crate::peripherals! {
         ASSIST_DEBUG <= ASSIST_DEBUG,
         BT <= virtual,
         CPU_CTRL <= virtual,
-        DMA <= DMA (DMA_IN_CH0,DMA_IN_CH1,DMA_IN_CH2,DMA_IN_CH3,DMA_IN_CH4,DMA_OUT_CH0,DMA_OUT_CH1,DMA_OUT_CH2,DMA_OUT_CH3,DMA_OUT_CH4),
         DS <= DS,
         EFUSE <= EFUSE,
         EXTMEM <= EXTMEM,
@@ -126,5 +125,12 @@ crate::peripherals! {
         (46, [Input, Output])
         (47, [Input, Output])
         (48, [Input, Output])
+    ],
+    dma_channels: [
+        DMA_CH0: DmaChannel0,
+        DMA_CH1: DmaChannel1,
+        DMA_CH2: DmaChannel2,
+        DMA_CH3: DmaChannel3,
+        DMA_CH4: DmaChannel4,
     ]
 }

esp-hal/src/spi/slave.rs

@@ -18,10 +18,8 @@
 //! # use esp_hal::dma_buffers;
 //! # use esp_hal::spi::SpiMode;
 //! # use esp_hal::spi::slave::Spi;
-//! # use esp_hal::dma::Dma;
+#![cfg_attr(pdma, doc = "let dma_channel = peripherals.DMA_SPI2;")]
-//! let dma = Dma::new(peripherals.DMA);
+#![cfg_attr(gdma, doc = "let dma_channel = peripherals.DMA_CH0;")]
-#![cfg_attr(pdma, doc = "let dma_channel = dma.spi2channel;")]
-#![cfg_attr(gdma, doc = "let dma_channel = dma.channel0;")]
 //! let sclk = peripherals.GPIO0;
 //! let miso = peripherals.GPIO1;
 //! let mosi = peripherals.GPIO2;

esp-hal/src/system.rs

@@ -5,10 +5,9 @@
 //! This `system` module defines the available radio peripherals and provides an
 //! interface to control and configure radio clocks.
 
-use core::sync::atomic::Ordering;
+use core::cell::RefCell;
 
-use critical_section::CriticalSection;
+use critical_section::{CriticalSection, Mutex};
-use portable_atomic::AtomicUsize;
 use strum::{EnumCount, EnumIter, IntoEnumIterator};
 
 use crate::peripherals::SYSTEM;
@@ -145,19 +144,22 @@ impl Peripheral {
     }
 }
 
-static PERIPHERAL_REF_COUNT: [AtomicUsize; Peripheral::COUNT] =
+static PERIPHERAL_REF_COUNT: Mutex<RefCell<[usize; Peripheral::COUNT]>> =
-    [const { AtomicUsize::new(0) }; Peripheral::COUNT];
+    Mutex::new(RefCell::new([0; Peripheral::COUNT]));
 
 /// Disable all peripherals.
 ///
 /// Peripherals listed in [KEEP_ENABLED] are NOT disabled.
 pub(crate) fn disable_peripherals() {
+    // Take the critical section up front to avoid taking it multiple times.
+    critical_section::with(|cs| {
         for p in Peripheral::iter() {
             if KEEP_ENABLED.contains(&p) {
                 continue;
             }
-        PeripheralClockControl::enable_forced(p, false, true);
+            PeripheralClockControl::enable_forced_with_cs(p, false, true, cs);
         }
+    })
 }
 
 #[derive(Debug)]
@@ -166,13 +168,18 @@ pub(crate) struct PeripheralGuard {
 }
 
 impl PeripheralGuard {
-    pub(crate) fn new(p: Peripheral) -> Self {
+    pub(crate) fn new_with(p: Peripheral, init: fn()) -> Self {
         if !KEEP_ENABLED.contains(&p) && PeripheralClockControl::enable(p) {
             PeripheralClockControl::reset(p);
+            init();
         }
 
         Self { peripheral: p }
     }
+
+    pub(crate) fn new(p: Peripheral) -> Self {
+        Self::new_with(p, || {})
+    }
 }
 
 impl Drop for PeripheralGuard {
@@ -187,14 +194,23 @@ impl Drop for PeripheralGuard {
 pub(crate) struct GenericPeripheralGuard<const P: u8> {}
 
 impl<const P: u8> GenericPeripheralGuard<P> {
-    pub(crate) fn new() -> Self {
+    pub(crate) fn new_with(init: fn(CriticalSection<'_>)) -> Self {
         let peripheral = unwrap!(Peripheral::try_from(P));
-        if !KEEP_ENABLED.contains(&peripheral) && PeripheralClockControl::enable(peripheral) {
+        critical_section::with(|cs| {
+            if !KEEP_ENABLED.contains(&peripheral)
+                && PeripheralClockControl::enable_with_cs(peripheral, cs)
+            {
                 PeripheralClockControl::reset(peripheral);
+                init(cs);
             }
+        });
 
         Self {}
     }
+
+    pub(crate) fn new() -> Self {
+        Self::new_with(|_| {})
+    }
 }
 
 impl<const P: u8> Drop for GenericPeripheralGuard<P> {
@@ -211,7 +227,7 @@ pub(crate) struct PeripheralClockControl;
 
 #[cfg(not(any(esp32c6, esp32h2)))]
 impl PeripheralClockControl {
-    fn enable_internal(peripheral: Peripheral, enable: bool, _cs: &CriticalSection<'_>) {
+    fn enable_internal(peripheral: Peripheral, enable: bool, _cs: CriticalSection<'_>) {
         debug!("Enable {:?} {}", peripheral, enable);
 
         let system = unsafe { &*SYSTEM::PTR };
@@ -595,7 +611,7 @@ impl PeripheralClockControl {
 
 #[cfg(any(esp32c6, esp32h2))]
 impl PeripheralClockControl {
-    fn enable_internal(peripheral: Peripheral, enable: bool, _cs: &CriticalSection<'_>) {
+    fn enable_internal(peripheral: Peripheral, enable: bool, _cs: CriticalSection<'_>) {
         debug!("Enable {:?} {}", peripheral, enable);
         let system = unsafe { &*SYSTEM::PTR };
 
@@ -971,6 +987,16 @@ impl PeripheralClockControl {
         Self::enable_forced(peripheral, true, false)
     }
 
+    /// Enables the given peripheral.
+    ///
+    /// This keeps track of enabling a peripheral - i.e. a peripheral
+    /// is only enabled with the first call attempt to enable it.
+    ///
+    /// Returns `true` if it actually enabled the peripheral.
+    pub(crate) fn enable_with_cs(peripheral: Peripheral, cs: CriticalSection<'_>) -> bool {
+        Self::enable_forced_with_cs(peripheral, true, false, cs)
+    }
+
     /// Disables the given peripheral.
     ///
     /// This keeps track of disabling a peripheral - i.e. it only
@@ -984,34 +1010,43 @@ impl PeripheralClockControl {
     }
 
     pub(crate) fn enable_forced(peripheral: Peripheral, enable: bool, force: bool) -> bool {
-        critical_section::with(|cs| {
+        critical_section::with(|cs| Self::enable_forced_with_cs(peripheral, enable, force, cs))
+    }
+
+    pub(crate) fn enable_forced_with_cs(
+        peripheral: Peripheral,
+        enable: bool,
+        force: bool,
+        cs: CriticalSection<'_>,
+    ) -> bool {
+        let mut ref_counts = PERIPHERAL_REF_COUNT.borrow_ref_mut(cs);
+        let ref_count = &mut ref_counts[peripheral as usize];
         if !force {
             if enable {
-                    let prev =
+                let prev = *ref_count;
-                        PERIPHERAL_REF_COUNT[peripheral as usize].fetch_add(1, Ordering::Relaxed);
+                *ref_count += 1;
                 if prev > 0 {
                     return false;
                 }
             } else {
-                    let prev =
+                let prev = *ref_count;
-                        PERIPHERAL_REF_COUNT[peripheral as usize].fetch_sub(1, Ordering::Relaxed);
+                *ref_count -= 1;
-                    assert!(prev != 0);
                 if prev > 1 {
                     return false;
                 }
+                assert!(prev != 0);
             };
         } else if !enable {
-                assert!(PERIPHERAL_REF_COUNT[peripheral as usize].swap(0, Ordering::Relaxed) == 0);
+            assert!(*ref_count == 0);
         }
 
         if !enable {
             Self::reset(peripheral);
         }
 
-            Self::enable_internal(peripheral, enable, &cs);
+        Self::enable_internal(peripheral, enable, cs);
 
         true
-        })
     }
 }
 

examples/src/bin/dma_extmem2mem.rs

@@ -9,12 +9,7 @@
 use aligned::{Aligned, A64};
 use esp_alloc as _;
 use esp_backtrace as _;
-use esp_hal::{
+use esp_hal::{delay::Delay, dma::Mem2Mem, dma_descriptors_chunk_size, prelude::*};
-    delay::Delay,
-    dma::{Dma, Mem2Mem},
-    dma_descriptors_chunk_size,
-    prelude::*,
-};
 use log::{error, info};
 extern crate alloc;
 
@@ -67,11 +62,10 @@ fn main() -> ! {
     let mut intram_buffer = dma_buffer_aligned!(DATA_SIZE, A64);
     let (rx_descriptors, tx_descriptors) = dma_descriptors_chunk_size!(DATA_SIZE, CHUNK_SIZE);
 
-    let dma = Dma::new(peripherals.DMA);
     let dma_peripheral = peripherals.SPI2;
 
     let mut mem2mem = Mem2Mem::new_with_chunk_size(
-        dma.channel0,
+        peripherals.DMA_CH0,
         dma_peripheral,
         rx_descriptors,
         tx_descriptors,

examples/src/bin/dma_mem2mem.rs

@@ -7,12 +7,7 @@
 #![no_main]
 
 use esp_backtrace as _;
-use esp_hal::{
+use esp_hal::{delay::Delay, dma::Mem2Mem, dma_buffers, prelude::*};
-    delay::Delay,
-    dma::{Dma, Mem2Mem},
-    dma_buffers,
-    prelude::*,
-};
 use log::{error, info};
 
 const DATA_SIZE: usize = 1024 * 10;
@@ -27,14 +22,21 @@ fn main() -> ! {
 
     let (mut rx_buffer, rx_descriptors, tx_buffer, tx_descriptors) = dma_buffers!(DATA_SIZE);
 
-    let dma = Dma::new(peripherals.DMA);
+    cfg_if::cfg_if! {
-    #[cfg(any(feature = "esp32c2", feature = "esp32c3", feature = "esp32s3"))]
+        if #[cfg(any(feature = "esp32c2", feature = "esp32c3", feature = "esp32s3"))] {
             let dma_peripheral = peripherals.SPI2;
-    #[cfg(not(any(feature = "esp32c2", feature = "esp32c3", feature = "esp32s3")))]
+        } else {
             let dma_peripheral = peripherals.MEM2MEM1;
+        }
+    }
 
-    let mut mem2mem =
+    let mut mem2mem = Mem2Mem::new(
-        Mem2Mem::new(dma.channel0, dma_peripheral, rx_descriptors, tx_descriptors).unwrap();
+        peripherals.DMA_CH0,
+        dma_peripheral,
+        rx_descriptors,
+        tx_descriptors,
+    )
+    .unwrap();
 
     for i in 0..core::mem::size_of_val(tx_buffer) {
         tx_buffer[i] = (i % 256) as u8;

examples/src/bin/embassy_spi.rs

@@ -22,7 +22,7 @@ use embassy_executor::Spawner;
 use embassy_time::{Duration, Timer};
 use esp_backtrace as _;
 use esp_hal::{
-    dma::*,
+    dma::{DmaRxBuf, DmaTxBuf},
     dma_buffers,
     prelude::*,
     spi::{
@@ -45,13 +45,11 @@ async fn main(_spawner: Spawner) {
     let mosi = peripherals.GPIO4;
     let cs = peripherals.GPIO5;
 
-    let dma = Dma::new(peripherals.DMA);
-
     cfg_if::cfg_if! {
         if #[cfg(any(feature = "esp32", feature = "esp32s2"))] {
-            let dma_channel = dma.spi2channel;
+            let dma_channel = peripherals.DMA_SPI2;
         } else {
-            let dma_channel = dma.channel0;
+            let dma_channel = peripherals.DMA_CH0;
         }
     }
 

examples/src/bin/spi_loopback_dma_psram.rs

@@ -25,7 +25,7 @@
 use esp_backtrace as _;
 use esp_hal::{
     delay::Delay,
-    dma::{Dma, DmaBufBlkSize, DmaRxBuf, DmaTxBuf},
+    dma::{DmaBufBlkSize, DmaRxBuf, DmaTxBuf},
     peripheral::Peripheral,
     prelude::*,
     spi::{
@@ -67,9 +67,6 @@ fn main() -> ! {
     let miso = unsafe { mosi.clone_unchecked() };
     let cs = peripherals.GPIO38;
 
-    let dma = Dma::new(peripherals.DMA);
-    let dma_channel = dma.channel0;
-
     let (_, tx_descriptors) =
         esp_hal::dma_descriptors_chunk_size!(0, DMA_BUFFER_SIZE, DMA_CHUNK_SIZE);
     let tx_buffer = dma_alloc_buffer!(DMA_BUFFER_SIZE, DMA_ALIGNMENT as usize);
@@ -103,7 +100,7 @@ fn main() -> ! {
     .with_miso(miso)
     .with_mosi(mosi)
     .with_cs(cs)
-    .with_dma(dma_channel);
+    .with_dma(peripherals.DMA_CH0);
 
     delay.delay_millis(100); // delay to let the above messages display
 

examples/src/bin/spi_slave_dma.rs

@@ -32,7 +32,6 @@
 use esp_backtrace as _;
 use esp_hal::{
     delay::Delay,
-    dma::Dma,
     dma_buffers,
     gpio::{Input, Level, Output, Pull},
     prelude::*,
@@ -54,12 +53,11 @@ fn main() -> ! {
     let slave_mosi = peripherals.GPIO2;
     let slave_cs = peripherals.GPIO3;
 
-    let dma = Dma::new(peripherals.DMA);
     cfg_if::cfg_if! {
         if #[cfg(feature = "esp32s2")] {
-            let dma_channel = dma.spi2channel;
+            let dma_channel = peripherals.DMA_SPI2;
         } else {
-            let dma_channel = dma.channel0;
+            let dma_channel = peripherals.DMA_CH0;
         }
     }
 

hil-test/tests/aes_dma.rs

@@ -7,7 +7,6 @@
 
 use esp_hal::{
     aes::{dma::CipherMode, Aes, Mode},
-    dma::Dma,
     dma_buffers,
     peripherals::Peripherals,
 };
@@ -27,8 +26,7 @@ mod tests {
 
     #[test]
     fn test_aes_128_dma_encryption(peripherals: Peripherals) {
-        let dma = Dma::new(peripherals.DMA);
+        let dma_channel = peripherals.DMA_CH0;
-        let dma_channel = dma.channel0;
 
         let (mut output, rx_descriptors, input, tx_descriptors) = dma_buffers!(DMA_BUFFER_SIZE);
 
@@ -66,8 +64,7 @@ mod tests {
 
     #[test]
     fn test_aes_128_dma_decryption(peripherals: Peripherals) {
-        let dma = Dma::new(peripherals.DMA);
+        let dma_channel = peripherals.DMA_CH0;
-        let dma_channel = dma.channel0;
 
         let (mut output, rx_descriptors, input, tx_descriptors) = dma_buffers!(DMA_BUFFER_SIZE);
 
@@ -104,8 +101,7 @@ mod tests {
 
     #[test]
     fn test_aes_256_dma_encryption(peripherals: Peripherals) {
-        let dma = Dma::new(peripherals.DMA);
+        let dma_channel = peripherals.DMA_CH0;
-        let dma_channel = dma.channel0;
 
         let (mut output, rx_descriptors, input, tx_descriptors) = dma_buffers!(DMA_BUFFER_SIZE);
 
@@ -143,8 +139,7 @@ mod tests {
 
     #[test]
     fn test_aes_256_dma_decryption(peripherals: Peripherals) {
-        let dma = Dma::new(peripherals.DMA);
+        let dma_channel = peripherals.DMA_CH0;
-        let dma_channel = dma.channel0;
 
         let (mut output, rx_descriptors, input, tx_descriptors) = dma_buffers!(DMA_BUFFER_SIZE);
 

hil-test/tests/dma_mem2mem.rs

@@ -6,7 +6,7 @@
 #![no_main]
 
 use esp_hal::{
-    dma::{AnyGdmaChannel, Dma, DmaChannelConvert, DmaError, Mem2Mem},
+    dma::{AnyGdmaChannel, DmaChannelConvert, DmaError, Mem2Mem},
     dma_buffers,
     dma_buffers_chunk_size,
     dma_descriptors,
@@ -37,8 +37,7 @@ mod tests {
     fn init() -> Context {
         let peripherals = esp_hal::init(esp_hal::Config::default());
 
-        let dma = Dma::new(peripherals.DMA);
+        let dma_channel = peripherals.DMA_CH0;
-        let dma_channel = dma.channel0;
 
         cfg_if::cfg_if! {
             if #[cfg(any(esp32c2, esp32c6, esp32h2))] {

hil-test/tests/embassy_interrupt_spi_dma.rs

@@ -9,7 +9,7 @@
 
 use embassy_time::{Duration, Instant, Ticker};
 use esp_hal::{
-    dma::{Dma, DmaRxBuf, DmaTxBuf},
+    dma::{DmaRxBuf, DmaTxBuf},
     dma_buffers,
     interrupt::{software::SoftwareInterruptControl, Priority},
     peripheral::Peripheral,
@@ -83,7 +83,6 @@ mod test {
     #[timeout(3)]
     async fn dma_does_not_lock_up_when_used_in_different_executors() {
         let peripherals = esp_hal::init(esp_hal::Config::default());
-        let dma = Dma::new(peripherals.DMA);
 
         cfg_if::cfg_if! {
             if #[cfg(systimer)] {
@@ -104,12 +103,12 @@ mod test {
         }
 
         cfg_if::cfg_if! {
-            if #[cfg(pdma)] {
+            if #[cfg(any(feature = "esp32", feature = "esp32s2"))] {
-                let dma_channel1 = dma.spi2channel;
+                let dma_channel1 = peripherals.DMA_SPI2;
-                let dma_channel2 = dma.spi3channel;
+                let dma_channel2 = peripherals.DMA_SPI3;
             } else {
-                let dma_channel1 = dma.channel0;
+                let dma_channel1 = peripherals.DMA_CH0;
-                let dma_channel2 = dma.channel1;
+                let dma_channel2 = peripherals.DMA_CH1;
             }
         }
 
@@ -253,7 +252,6 @@ mod test {
         }
 
         let peripherals = esp_hal::init(esp_hal::Config::default());
-        let dma = Dma::new(peripherals.DMA);
 
         cfg_if::cfg_if! {
             if #[cfg(systimer)] {
@@ -275,9 +273,9 @@ mod test {
 
         cfg_if::cfg_if! {
             if #[cfg(pdma)] {
-                let dma_channel = dma.spi2channel;
+                let dma_channel = peripherals.DMA_SPI2;
             } else {
-                let dma_channel = dma.channel0;
+                let dma_channel = peripherals.DMA_CH0;
             }
         }
 

hil-test/tests/i2s.rs

@@ -12,7 +12,6 @@
 
 use esp_hal::{
     delay::Delay,
-    dma::Dma,
     dma_buffers,
     gpio::{AnyPin, NoPin, Pin},
     i2s::master::{DataFormat, I2s, I2sTx, Standard},
@@ -112,13 +111,11 @@ mod tests {
     fn init() -> Context {
         let peripherals = esp_hal::init(esp_hal::Config::default());
 
-        let dma = Dma::new(peripherals.DMA);
-
         cfg_if::cfg_if! {
-            if #[cfg(any(esp32, esp32s2))] {
+            if #[cfg(pdma)] {
-                let dma_channel = dma.i2s0channel;
+                let dma_channel = peripherals.DMA_I2S0;
             } else {
-                let dma_channel = dma.channel0;
+                let dma_channel = peripherals.DMA_CH0;
             }
         }
 

hil-test/tests/lcd_cam.rs

@@ -6,7 +6,7 @@
 #![no_main]
 
 use esp_hal::{
-    dma::{Dma, DmaChannel, DmaRxBuf, DmaTxBuf},
+    dma::{DmaChannel, DmaRxBuf, DmaTxBuf},
     dma_buffers,
     gpio::Level,
     lcd_cam::{
@@ -55,10 +55,9 @@ mod tests {
     fn test_camera_can_receive_from_rgb(ctx: Context) {
         let peripherals = ctx.peripherals;
 
-        let dma = Dma::new(peripherals.DMA);
         let lcd_cam = LcdCam::new(peripherals.LCD_CAM);
 
-        let (rx_channel, tx_channel) = dma.channel2.split();
+        let (rx_channel, tx_channel) = peripherals.DMA_CH2.split();
 
         let (vsync_in, vsync_out) = peripherals.GPIO6.split();
         let (hsync_in, hsync_out) = peripherals.GPIO7.split();

hil-test/tests/lcd_cam_i8080.rs

@@ -6,7 +6,7 @@
 #![no_main]
 
 use esp_hal::{
-    dma::{Dma, DmaTxBuf},
+    dma::{DmaChannel0, DmaTxBuf},
     dma_buffers,
     gpio::{GpioPin, NoPin},
     lcd_cam::{
@@ -38,7 +38,7 @@ struct Context<'d> {
     lcd_cam: LcdCam<'d, Blocking>,
     pcnt: Pcnt<'d>,
     pins: Pins,
-    dma: Dma<'d>,
+    dma: DmaChannel0,
     dma_buf: DmaTxBuf,
 }
 
@@ -50,7 +50,6 @@ mod tests {
     #[init]
     fn init() -> Context<'static> {
         let peripherals = esp_hal::init(esp_hal::Config::default());
-        let dma = Dma::new(peripherals.DMA);
         let lcd_cam = LcdCam::new(peripherals.LCD_CAM);
         let pcnt = Pcnt::new(peripherals.PCNT);
 
@@ -59,7 +58,7 @@ mod tests {
 
         Context {
             lcd_cam,
-            dma,
+            dma: peripherals.DMA_CH0,
             pcnt,
             pins: Pins {
                 GPIO8: peripherals.GPIO8,
@@ -76,13 +75,7 @@ mod tests {
     fn test_i8080_8bit(ctx: Context<'static>) {
         let pins = TxEightBits::new(NoPin, NoPin, NoPin, NoPin, NoPin, NoPin, NoPin, NoPin);
 
-        let i8080 = I8080::new(
+        let i8080 = I8080::new(ctx.lcd_cam.lcd, ctx.dma, pins, 20.MHz(), Config::default());
-            ctx.lcd_cam.lcd,
-            ctx.dma.channel0,
-            pins,
-            20.MHz(),
-            Config::default(),
-        );
 
         let xfer = i8080.send(Command::<u8>::None, 0, ctx.dma_buf).unwrap();
         xfer.wait().0.unwrap();
@@ -139,13 +132,7 @@ mod tests {
             NoPin,
         );
 
-        let mut i8080 = I8080::new(
+        let mut i8080 = I8080::new(ctx.lcd_cam.lcd, ctx.dma, pins, 20.MHz(), Config::default())
-            ctx.lcd_cam.lcd,
-            ctx.dma.channel0,
-            pins,
-            20.MHz(),
-            Config::default(),
-        )
             .with_cs(cs_signal)
             .with_ctrl_pins(NoPin, NoPin);
 
@@ -238,7 +225,6 @@ mod tests {
             .channel0
             .set_input_mode(EdgeMode::Hold, EdgeMode::Increment);
 
-        let channel = ctx.dma.channel0;
         let pins = TxSixteenBits::new(
             NoPin,
             NoPin,
@@ -258,7 +244,7 @@ mod tests {
             unit3_signal,
         );
 
-        let mut i8080 = I8080::new(ctx.lcd_cam.lcd, channel, pins, 20.MHz(), Config::default())
+        let mut i8080 = I8080::new(ctx.lcd_cam.lcd, ctx.dma, pins, 20.MHz(), Config::default())
             .with_cs(cs_signal)
             .with_ctrl_pins(NoPin, NoPin);
 

hil-test/tests/lcd_cam_i8080_async.rs

@@ -7,7 +7,7 @@
 #![no_main]
 
 use esp_hal::{
-    dma::{Dma, DmaTxBuf},
+    dma::{DmaChannel0, DmaTxBuf},
     dma_buffers,
     gpio::NoPin,
     lcd_cam::{
@@ -23,7 +23,7 @@ const DATA_SIZE: usize = 1024 * 10;
 
 struct Context<'d> {
     lcd_cam: LcdCam<'d, Async>,
-    dma: Dma<'d>,
+    dma: DmaChannel0,
     dma_buf: DmaTxBuf,
 }
 
@@ -36,14 +36,13 @@ mod tests {
     async fn init() -> Context<'static> {
         let peripherals = esp_hal::init(esp_hal::Config::default());
 
-        let dma = Dma::new(peripherals.DMA);
         let lcd_cam = LcdCam::new(peripherals.LCD_CAM).into_async();
         let (_, _, tx_buffer, tx_descriptors) = dma_buffers!(0, DATA_SIZE);
         let dma_buf = DmaTxBuf::new(tx_descriptors, tx_buffer).unwrap();
 
         Context {
             lcd_cam,
-            dma,
+            dma: peripherals.DMA_CH0,
             dma_buf,
         }
     }
@@ -52,13 +51,7 @@ mod tests {
     async fn test_i8080_8bit(ctx: Context<'static>) {
         let pins = TxEightBits::new(NoPin, NoPin, NoPin, NoPin, NoPin, NoPin, NoPin, NoPin);
 
-        let i8080 = I8080::new(
+        let i8080 = I8080::new(ctx.lcd_cam.lcd, ctx.dma, pins, 20.MHz(), Config::default());
-            ctx.lcd_cam.lcd,
-            ctx.dma.channel0,
-            pins,
-            20.MHz(),
-            Config::default(),
-        );
 
         let mut transfer = i8080.send(Command::<u8>::None, 0, ctx.dma_buf).unwrap();
 

hil-test/tests/parl_io_tx.rs

@@ -7,7 +7,7 @@
 #[cfg(esp32c6)]
 use esp_hal::parl_io::{TxPinConfigWithValidPin, TxSixteenBits};
 use esp_hal::{
-    dma::{Dma, DmaChannel0},
+    dma::DmaChannel0,
     gpio::{
         interconnect::{InputSignal, OutputSignal},
         NoPin,
@@ -57,8 +57,7 @@ mod tests {
         let (valid_loopback, valid) = valid.split();
         let pcnt = Pcnt::new(peripherals.PCNT);
         let pcnt_unit = pcnt.unit0;
-        let dma = Dma::new(peripherals.DMA);
+        let dma_channel = peripherals.DMA_CH0;
-        let dma_channel = dma.channel0;
 
         let parl_io = peripherals.PARL_IO;
 

hil-test/tests/parl_io_tx_async.rs

@@ -9,7 +9,7 @@
 #[cfg(esp32c6)]
 use esp_hal::parl_io::{TxPinConfigWithValidPin, TxSixteenBits};
 use esp_hal::{
-    dma::{Dma, DmaChannel0},
+    dma::DmaChannel0,
     gpio::{
         interconnect::{InputSignal, OutputSignal},
         NoPin,
@@ -59,8 +59,7 @@ mod tests {
         let (valid_loopback, valid) = valid.split();
         let pcnt = Pcnt::new(peripherals.PCNT);
         let pcnt_unit = pcnt.unit0;
-        let dma = Dma::new(peripherals.DMA);
+        let dma_channel = peripherals.DMA_CH0;
-        let dma_channel = dma.channel0;
 
         let parl_io = peripherals.PARL_IO;
 

hil-test/tests/qspi.rs

@@ -8,7 +8,7 @@
 #[cfg(pcnt)]
 use esp_hal::pcnt::{channel::EdgeMode, unit::Unit, Pcnt};
 use esp_hal::{
-    dma::{Dma, DmaRxBuf, DmaTxBuf},
+    dma::{DmaRxBuf, DmaTxBuf},
     dma_buffers,
     gpio::{AnyPin, Input, Level, Output, Pull},
     prelude::*,
@@ -192,13 +192,11 @@ mod tests {
         let _ = Input::new(&mut pin_mirror, Pull::Down);
         let _ = Input::new(&mut unconnected_pin, Pull::Down);
 
-        let dma = Dma::new(peripherals.DMA);
-
         cfg_if::cfg_if! {
-            if #[cfg(any(esp32, esp32s2))] {
+            if #[cfg(pdma)] {
-                let dma_channel = dma.spi2channel;
+                let dma_channel = peripherals.DMA_SPI2;
             } else {
-                let dma_channel = dma.channel0;
+                let dma_channel = peripherals.DMA_CH0;
             }
         }
 

hil-test/tests/spi_full_duplex.rs

@@ -12,7 +12,7 @@ use embedded_hal::spi::SpiBus;
 #[cfg(pcnt)]
 use embedded_hal_async::spi::SpiBus as SpiBusAsync;
 use esp_hal::{
-    dma::{Dma, DmaDescriptor, DmaRxBuf, DmaTxBuf},
+    dma::{DmaDescriptor, DmaRxBuf, DmaTxBuf},
     dma_buffers,
     gpio::{Level, NoPin},
     peripheral::Peripheral,
@@ -61,13 +61,11 @@ mod tests {
         let sclk = peripherals.GPIO0;
         let (_, mosi) = hil_test::common_test_pins!(peripherals);
 
-        let dma = Dma::new(peripherals.DMA);
-
         cfg_if::cfg_if! {
-            if #[cfg(any(esp32, esp32s2))] {
+            if #[cfg(pdma)] {
-                let dma_channel = dma.spi2channel;
+                let dma_channel = peripherals.DMA_SPI2;
             } else {
-                let dma_channel = dma.channel0;
+                let dma_channel = peripherals.DMA_CH0;
             }
         }
 

hil-test/tests/spi_half_duplex_read.rs

@@ -6,7 +6,7 @@
 #![no_main]
 
 use esp_hal::{
-    dma::{Dma, DmaRxBuf, DmaTxBuf},
+    dma::{DmaRxBuf, DmaTxBuf},
     dma_buffers,
     gpio::{Level, Output},
     prelude::*,
@@ -38,13 +38,11 @@ mod tests {
 
         let miso_mirror = Output::new(miso_mirror, Level::High);
 
-        let dma = Dma::new(peripherals.DMA);
-
         cfg_if::cfg_if! {
-            if #[cfg(any(feature = "esp32", feature = "esp32s2"))] {
+            if #[cfg(pdma)] {
-                let dma_channel = dma.spi2channel;
+                let dma_channel = peripherals.DMA_SPI2;
             } else {
-                let dma_channel = dma.channel0;
+                let dma_channel = peripherals.DMA_CH0;
             }
         }
 

hil-test/tests/spi_half_duplex_write.rs

@@ -6,7 +6,7 @@
 #![no_main]
 
 use esp_hal::{
-    dma::{Dma, DmaRxBuf, DmaTxBuf},
+    dma::{DmaRxBuf, DmaTxBuf},
     dma_buffers,
     gpio::interconnect::InputSignal,
     pcnt::{channel::EdgeMode, unit::Unit, Pcnt},
@@ -39,13 +39,12 @@ mod tests {
         let (mosi, _) = hil_test::common_test_pins!(peripherals);
 
         let pcnt = Pcnt::new(peripherals.PCNT);
-        let dma = Dma::new(peripherals.DMA);
 
         cfg_if::cfg_if! {
-            if #[cfg(any(feature = "esp32", feature = "esp32s2"))] {
+            if #[cfg(pdma)] {
-                let dma_channel = dma.spi2channel;
+                let dma_channel = peripherals.DMA_SPI2;
             } else {
-                let dma_channel = dma.channel0;
+                let dma_channel = peripherals.DMA_CH0;
             }
         }
 

hil-test/tests/spi_half_duplex_write_psram.rs

@@ -7,7 +7,7 @@
 use defmt::error;
 use esp_alloc as _;
 use esp_hal::{
-    dma::{Dma, DmaBufBlkSize, DmaRxBuf, DmaTxBuf},
+    dma::{DmaBufBlkSize, DmaRxBuf, DmaTxBuf},
     dma_buffers,
     dma_descriptors_chunk_size,
     gpio::interconnect::InputSignal,
@@ -57,9 +57,8 @@ mod tests {
         let (mosi, _) = hil_test::common_test_pins!(peripherals);
 
         let pcnt = Pcnt::new(peripherals.PCNT);
-        let dma = Dma::new(peripherals.DMA);
 
-        let dma_channel = dma.channel0;
+        let dma_channel = peripherals.DMA_CH0;
 
         let (mosi_loopback, mosi) = mosi.split();
 

hil-test/tests/spi_slave.rs

@@ -9,7 +9,6 @@
 #![no_main]
 
 use esp_hal::{
-    dma::Dma,
     dma_buffers,
     gpio::{Input, Level, Output, Pull},
     peripheral::Peripheral,
@@ -107,13 +106,11 @@ mod tests {
         let (sclk_pin, _) = hil_test::common_test_pins!(peripherals);
         let cs_pin = hil_test::unconnected_pin!(peripherals);
 
-        let dma = Dma::new(peripherals.DMA);
-
         cfg_if::cfg_if! {
-            if #[cfg(any(esp32, esp32s2))] {
+            if #[cfg(pdma)] {
-                let dma_channel = dma.spi2channel;
+                let dma_channel = peripherals.DMA_SPI2;
             } else {
-                let dma_channel = dma.channel0;
+                let dma_channel = peripherals.DMA_CH0;
             }
         }
 

qa-test/src/bin/embassy_i2s_read.rs

@@ -20,7 +20,6 @@
 use embassy_executor::Spawner;
 use esp_backtrace as _;
 use esp_hal::{
-    dma::Dma,
     dma_buffers,
     i2s::master::{DataFormat, I2s, Standard},
     prelude::*,
@@ -36,11 +35,13 @@ async fn main(_spawner: Spawner) {
     let timg0 = TimerGroup::new(peripherals.TIMG0);
     esp_hal_embassy::init(timg0.timer0);
 
-    let dma = Dma::new(peripherals.DMA);
+    cfg_if::cfg_if! {
-    #[cfg(any(feature = "esp32", feature = "esp32s2"))]
+        if #[cfg(any(feature = "esp32", feature = "esp32s2"))] {
-    let dma_channel = dma.i2s0channel;
+            let dma_channel = peripherals.DMA_I2S0;
-    #[cfg(not(any(feature = "esp32", feature = "esp32s2")))]
+        } else {
-    let dma_channel = dma.channel0;
+            let dma_channel = peripherals.DMA_CH0;
+        }
+    }
 
     let (rx_buffer, rx_descriptors, _, tx_descriptors) = dma_buffers!(4092 * 4, 0);
 

qa-test/src/bin/embassy_i2s_sound.rs

@@ -34,7 +34,6 @@
 use embassy_executor::Spawner;
 use esp_backtrace as _;
 use esp_hal::{
-    dma::Dma,
     dma_buffers,
     i2s::master::{DataFormat, I2s, Standard},
     prelude::*,
@@ -58,11 +57,13 @@ async fn main(_spawner: Spawner) {
     let timg0 = TimerGroup::new(peripherals.TIMG0);
     esp_hal_embassy::init(timg0.timer0);
 
-    let dma = Dma::new(peripherals.DMA);
+    cfg_if::cfg_if! {
-    #[cfg(any(feature = "esp32", feature = "esp32s2"))]
+        if #[cfg(any(feature = "esp32", feature = "esp32s2"))] {
-    let dma_channel = dma.i2s0channel;
+            let dma_channel = peripherals.DMA_I2S0;
-    #[cfg(not(any(feature = "esp32", feature = "esp32s2")))]
+        } else {
-    let dma_channel = dma.channel0;
+            let dma_channel = peripherals.DMA_CH0;
+        }
+    }
 
     let (_, rx_descriptors, tx_buffer, tx_descriptors) = dma_buffers!(0, 32000);
 

qa-test/src/bin/lcd_cam_ov2640.rs

@@ -28,7 +28,6 @@
 use esp_backtrace as _;
 use esp_hal::{
     delay::Delay,
-    dma::Dma,
     dma_rx_stream_buffer,
     i2c::{
         self,
@@ -47,8 +46,6 @@ use esp_println::{print, println};
 fn main() -> ! {
     let peripherals = esp_hal::init(esp_hal::Config::default());
 
-    let dma = Dma::new(peripherals.DMA);
-
     let dma_rx_buf = dma_rx_stream_buffer!(20 * 1000, 1000);
 
     let cam_siod = peripherals.GPIO4;
@@ -69,7 +66,7 @@ fn main() -> ! {
     );
 
     let lcd_cam = LcdCam::new(peripherals.LCD_CAM);
-    let camera = Camera::new(lcd_cam.cam, dma.channel0, cam_data_pins, 20u32.MHz())
+    let camera = Camera::new(lcd_cam.cam, peripherals.DMA_CH0, cam_data_pins, 20u32.MHz())
         .with_master_clock(cam_xclk)
         .with_pixel_clock(cam_pclk)
         .with_ctrl_pins(cam_vsync, cam_href);

qa-test/src/bin/lcd_dpi.rs

@@ -34,7 +34,6 @@ use core::iter::{empty, once};
 use esp_backtrace as _;
 use esp_hal::{
     delay::Delay,
-    dma::Dma,
     dma_loop_buffer,
     gpio::{Level, Output},
     i2c,
@@ -70,8 +69,7 @@ fn main() -> ! {
     .with_sda(peripherals.GPIO47)
     .with_scl(peripherals.GPIO48);
 
-    let dma = Dma::new(peripherals.DMA);
+    let tx_channel = peripherals.DMA_CH2;
-    let tx_channel = dma.channel2;
     let lcd_cam = LcdCam::new(peripherals.LCD_CAM);
 
     let mut expander = Tca9554::new(i2c);

qa-test/src/bin/lcd_i8080.rs

@@ -25,7 +25,7 @@
 use esp_backtrace as _;
 use esp_hal::{
     delay::Delay,
-    dma::{Dma, DmaTxBuf},
+    dma::DmaTxBuf,
     dma_tx_buffer,
     gpio::{Input, Level, Output, Pull},
     lcd_cam::{
@@ -47,8 +47,6 @@ fn main() -> ! {
     let lcd_wr = peripherals.GPIO47; // Write clock
     let lcd_te = peripherals.GPIO48; // Frame sync
 
-    let dma = Dma::new(peripherals.DMA);
-
     let dma_tx_buf = dma_tx_buffer!(4000).unwrap();
 
     let delay = Delay::new();
@@ -71,7 +69,7 @@ fn main() -> ! {
     let lcd_cam = LcdCam::new(peripherals.LCD_CAM);
     let i8080 = I8080::new(
         lcd_cam.lcd,
-        dma.channel0,
+        peripherals.DMA_CH0,
         tx_pins,
         20.MHz(),
         Config::default(),

qa-test/src/bin/qspi_flash.rs

@@ -30,7 +30,7 @@
 use esp_backtrace as _;
 use esp_hal::{
     delay::Delay,
-    dma::{Dma, DmaRxBuf, DmaTxBuf},
+    dma::{DmaRxBuf, DmaTxBuf},
     dma_buffers,
     prelude::*,
     spi::{
@@ -63,13 +63,11 @@ fn main() -> ! {
         }
     }
 
-    let dma = Dma::new(peripherals.DMA);
-
     cfg_if::cfg_if! {
         if #[cfg(any(feature = "esp32", feature = "esp32s2"))] {
-            let dma_channel = dma.spi2channel;
+            let dma_channel = peripherals.DMA_SPI2;
         } else {
-            let dma_channel = dma.channel0;
+            let dma_channel = peripherals.DMA_CH0;
         }
     }