diff --git a/.gitignore b/.gitignore
index 597fbb9..4cd4ef4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ Cargo.lock
 bloat_log*
 itm.txt
 .gdb_history
+.vscode/STM32F407.svd
diff --git a/.vscode/.cortex-debug.peripherals.state.json b/.vscode/.cortex-debug.peripherals.state.json
new file mode 100644
index 0000000..0637a08
--- /dev/null
+++ b/.vscode/.cortex-debug.peripherals.state.json
@@ -0,0 +1 @@
+[]
\ No newline at end of file
diff --git a/.vscode/.cortex-debug.registers.state.json b/.vscode/.cortex-debug.registers.state.json
new file mode 100644
index 0000000..0637a08
--- /dev/null
+++ b/.vscode/.cortex-debug.registers.state.json
@@ -0,0 +1 @@
+[]
\ No newline at end of file
diff --git a/.vscode/README.md b/.vscode/README.md
new file mode 100644
index 0000000..3b25b25
--- /dev/null
+++ b/.vscode/README.md
@@ -0,0 +1,109 @@
+# VS Code Configuration
+
+Example configurations for debugging programs in-editor with VS Code.  
+This directory contains configurations for two platforms:
+
+ - `LM3S6965EVB` on QEMU
+ - `STM32F303x` via OpenOCD
+
+## Required Extensions
+
+If you have the `code` command in your path, you can run the following commands to install the necessary extensions.
+
+```sh
+code --install-extension rust-lang.rust
+code --install-extension marus25.cortex-debug
+```
+
+Otherwise, you can use the Extensions view to search for and install them, or go directly to their marketplace pages and click the "Install" button.
+
+- [Rust Language Server (RLS)](https://marketplace.visualstudio.com/items?itemName=rust-lang.rust)
+- [Cortex-Debug](https://marketplace.visualstudio.com/items?itemName=marus25.cortex-debug)
+
+## Use
+
+The quickstart comes with two debug configurations.
+Both are configured to build the project, using the default settings from `.cargo/config`, prior to starting a debug session.
+
+1. QEMU: Starts a debug session using an emulation of the `LM3S6965EVB` mcu.
+   - This works on a fresh `cargo generate` without modification of any of the settings described above.
+   - Semihosting output will be written to the Output view `Adapter Output`.
+   - `ITM` logging does not work with QEMU emulation.
+
+2. OpenOCD: Starts a debug session for a `STM32F3DISCOVERY` board (or any `STM32F303x` running at 8MHz).
+   - Follow the instructions above for configuring the build with `.cargo/config` and the `memory.x` linker script.
+   - `ITM` output will be written to the Output view `SWO: ITM [port: 0, type: console]` output.
+
+### Git
+
+Files in the `.vscode/` directory are `.gitignore`d by default because many files that may end up in the `.vscode/` directory should not be committed and shared.  
+If you would like to save this debug configuration to your repository and share it with your team, you'll need to explicitly `git add` the files to your repository.
+
+```sh
+git add -f .vscode/launch.json
+git add -f .vscode/tasks.json
+git add -f .vscode/*.svd
+```
+
+## Customizing for other targets
+
+For full documentation, see the [Cortex-Debug][cortex-debug] repository.
+
+### Device
+
+Some configurations use this to automatically find the SVD file.  
+Replace this with the part number for your device.
+
+```json
+"device": "STM32F303VCT6",
+```
+
+### OpenOCD Config Files
+
+The `configFiles` property specifies a list of files to pass to OpenOCD.
+
+```json
+"configFiles": [
+    "interface/stlink-v2-1.cfg",
+    "target/stm32f3x.cfg"
+],
+```
+
+See the [OpenOCD config docs][openocd-config] for more information and the [OpenOCD repository for available configuration files][openocd-repo].
+
+### SVD
+
+The SVD file is a standard way of describing all registers and peripherals of an ARM Cortex-M mCU.  
+Cortex-Debug needs this file to display the current register values for the peripherals on the device.  
+
+You can probably find the SVD for your device on the vendor's website.  
+
+
+For example, the STM32F3DISCOVERY board uses an mcu from the `STM32F303x` line of processors.  
+All the SVD files for the STM32F3 series are available on [ST's Website][stm32f3].  
+Download the [stm32f3 SVD pack][stm32f3-svd], and copy the `STM32F303.svd` file into `.vscode/`.  
+This line of the config tells the Cortex-Debug plug in where to find the file.
+
+```json
+"svdFile": "${workspaceRoot}/.vscode/STM32F303.svd",
+```
+
+For other processors, simply copy the correct `*.svd` file into the project and update the config accordingly.
+
+### CPU Frequency
+
+If your device is running at a frequency other than 8MHz, you'll need to modify this line of `launch.json` for the `ITM` output to work correctly.
+
+```json
+"cpuFrequency": 8000000,
+```
+
+### Other GDB Servers
+
+For information on setting up GDB servers other than OpenOCD, see the [Cortex-Debug repository][cortex-debug].
+
+[cortex-debug]: https://github.com/Marus/cortex-debug
+[stm32f3]: https://www.st.com/content/st_com/en/products/microcontrollers-microprocessors/stm32-32-bit-arm-cortex-mcus/stm32-mainstream-mcus/stm32f3-series.html#resource
+[stm32f3-svd]: https://www.st.com/resource/en/svd/stm32f3_svd.zip
+[openocd-config]: http://openocd.org/doc/html/Config-File-Guidelines.html
+[openocd-repo]: https://sourceforge.net/p/openocd/code/ci/master/tree/tcl/
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..5a6574b
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,14 @@
+{
+	// See https://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+	// Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+
+	// List of extensions which should be recommended for users of this workspace.
+	"recommendations": [
+		"rust-lang.rust",
+		"marus25.cortex-debug",
+	],
+	// List of extensions recommended by VS Code that should not be recommended for users of this workspace.
+	"unwantedRecommendations": [
+		
+	]
+}
\ No newline at end of file
diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..b45eec7
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,48 @@
+{
+  /*
+   * Requires the Rust Language Server (RLS) and Cortex-Debug extensions
+   * https://marketplace.visualstudio.com/items?itemName=rust-lang.rust
+   * https://marketplace.visualstudio.com/items?itemName=marus25.cortex-debug
+   */
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "cortex-debug",
+      "request": "launch",
+      "name": "Debug (QEMU)",
+      "servertype": "qemu",
+      "cwd": "${workspaceRoot}",
+      "preLaunchTask": "cargo build",
+      "runToMain": true,
+      "executable": "./target/thumbv7m-none-eabi/debug/{{project-name}}",
+      /* Run `cargo build --example hello` and uncomment this line to run semi-hosting example */
+      //"executable": "./target/thumbv7m-none-eabi/debug/examples/hello",
+      "cpu": "cortex-m3",
+      "machine": "lm3s6965evb"
+    },
+    {
+      /* Configuration for the STM32F407G Discovery board */
+      "type": "cortex-debug",
+      "request": "launch",
+      "name": "Debug (OpenOCD)",
+      "servertype": "openocd",
+      "cwd": "${workspaceRoot}",
+      "preLaunchTask": "cargo build --examples",
+      "runToMain": true,
+      // "executable": "./target/thumbv7em-none-eabihf/debug/{{project-name}}",
+      /* Run `cargo build --example itm` and uncomment this line to run itm example */
+      // "executable": "./target/thumbv7em-none-eabihf/debug/examples/itm",
+      "executable": "./target/thumbv7em-none-eabihf/debug/examples/audio",
+      "device": "STM32F407VGT6",
+      "configFiles": ["openocd.cfg"],
+      "svdFile": "${workspaceRoot}/.vscode/STM32F407.svd",
+      "swoConfig": {
+        "enabled": true,
+        "cpuFrequency": 168000000,
+        "swoFrequency": 2000000,
+        "source": "probe",
+        "decoders": [{ "type": "console", "label": "ITM", "port": 0 }]
+      }
+    }
+  ]
+}
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..73da208
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,55 @@
+{
+  // See https://go.microsoft.com/fwlink/?LinkId=733558
+  // for the documentation about the tasks.json format
+  "version": "2.0.0",
+  "tasks": [
+    {
+      /*
+       * This is the default cargo build task,
+       * but we need to provide a label for it,
+       * so we can invoke it from the debug launcher.
+       */
+      "label": "cargo build",
+      "type": "process",
+      "command": "cargo",
+      "args": ["build"],
+      "problemMatcher": ["$rustc"],
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      }
+    },
+    {
+      "label": "cargo build --release",
+      "type": "process",
+      "command": "cargo",
+      "args": ["build", "--release"],
+      "problemMatcher": ["$rustc"],
+      "group": "build"
+    },
+    {
+      "label": "cargo build --examples",
+      "type": "process",
+      "command": "cargo",
+      "args": ["build", "--example", "audio"],
+      "problemMatcher": ["$rustc"],
+      "group": "build"
+    },
+    {
+      "label": "cargo build --examples --release",
+      "type": "process",
+      "command": "cargo",
+      "args": ["build", "--examples", "--release"],
+      "problemMatcher": ["$rustc"],
+      "group": "build"
+    },
+    {
+      "label": "cargo clean",
+      "type": "process",
+      "command": "cargo",
+      "args": ["clean"],
+      "problemMatcher": [],
+      "group": "build"
+    }
+  ]
+}
diff --git a/Cargo.toml b/Cargo.toml
index 361fb14..71c1959 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,20 +22,37 @@ readme = "README.md"
 accelerometer = "0.11.0"
 cortex-m = "0.6"
 cortex-m-rt = "0.6"
-lis302dl = "0.1.0"
+# lis302dl = "0.1.0"
+
+[dependencies.lis302dl]
+path = "../lis302dl"
+
+[dependencies.cs43l22]
+# git = "https://github.com/maxekman/cs43l22/"
+# branch = "master"
+path = "../cs43l22"
 
 [dependencies.embedded-hal]
+# TODO: Update version when I2S proposal is finalized:
+# https://github.com/rust-embedded/embedded-hal/pull/204
 features = ["unproven"]
-version = "0.2"
+# version = "0.2.3"
+# git = "https://github.com/eldruin/embedded-hal/"
+# branch = "i2s-v0.2.x"
+path = "../embedded-hal"
 
 [dependencies.stm32f4xx-hal]
 default-features = false
 features = ["rt", "stm32f407"]
-version = "0.8.2"
+# version = "0.8.2"
+# git = "https://github.com/maxekman/stm32f4xx-hal/"
+# branch = "i2s"
+path = "../stm32f4xx-hal"
 
 [dev-dependencies]
 ssd1306 = "0.2"
 nb = "0.1"
+cortex-m-log = { version = "~0.6", features = ["itm"] }
 panic-halt = "0.2"
 panic-itm = "0.4"
 
diff --git a/examples/audio.rs b/examples/audio.rs
new file mode 100644
index 0000000..4c98e33
--- /dev/null
+++ b/examples/audio.rs
@@ -0,0 +1,74 @@
+//! Plays a test tone through the DAC with headphone amp.
+
+#![no_main]
+#![no_std]
+
+extern crate panic_itm;
+
+use cortex_m::peripheral::Peripherals;
+use cortex_m_rt::entry;
+
+use stm32f407g_disc as board;
+
+use crate::board::{audio_out::AudioOut, hal::delay::Delay, hal::prelude::*, hal::stm32};
+use embedded_hal::blocking::i2s::Write;
+
+use cortex_m_log::println;
+use cortex_m_log::{destination::Itm, printer::itm::InterruptSync as InterruptSyncItm};
+
+#[entry]
+fn main() -> ! {
+    let p = stm32::Peripherals::take().unwrap();
+    let cp = Peripherals::take().unwrap();
+
+    let mut log = InterruptSyncItm::new(Itm::new(cp.ITM));
+
+    let gpioa = p.GPIOA.split();
+    let gpiob = p.GPIOB.split();
+    let gpioc = p.GPIOC.split();
+    let gpiod = p.GPIOD.split();
+
+    // TODO: Use frequency when setting up clocks.
+    let audio_freq = 48000;
+
+    // Set clock to 64 MHz and freeze.
+    let rcc = p.RCC.constrain();
+    let clocks = rcc
+        .cfgr
+        .use_hse(8.mhz())
+        .sysclk(168.mhz())
+        .plli2sclk(audio_freq.hz())
+        .freeze();
+
+    // Get delay provider.
+    let mut delay = Delay::new(cp.SYST, clocks);
+
+    println!(log, "\nSetup audio output");
+    let mut audio_out = AudioOut::new(
+        p.I2C1, p.SPI3, gpioa, gpiob, gpioc, gpiod, clocks, &mut delay, audio_freq, 128,
+    );
+
+    println!(log, "Starting audio");
+    play_sawtooth(&mut audio_out.i2s);
+}
+
+// Demonstrating decoupling of audio device and application code using the
+// embedded-hal trait for I2S.
+fn play_sawtooth(i2s: &mut impl Write<u16>) -> ! {
+    let mut s: u16 = 0;
+    let mut y: u16 = 100;
+    loop {
+        // Send both left and right word (without buffering).
+        i2s.try_write(&[s], &[s]);
+
+        // Sawtooth with incrementing pitch each cycle.
+        if s >= (65535 - y) {
+            s = 0;
+            y += 1;
+            if y > 400 {
+                y = 100
+            }
+        }
+        s += y;
+    }
+}
diff --git a/openocd.gdb b/openocd.gdb
index 6468bbe..6a19eae 100644
--- a/openocd.gdb
+++ b/openocd.gdb
@@ -19,7 +19,6 @@ break main
 # 168000000 is the core clock frequency
 monitor tpiu config internal itm.txt uart off 168000000
 
-
 # OR: make the microcontroller SWO (PB3) pin output compatible with UART (8N1)
 # 8000000 is the frequency of the SWO pin
 # monitor tpiu config external uart off 8000000 2000000
diff --git a/src/audio_out.rs b/src/audio_out.rs
new file mode 100644
index 0000000..6f6c61a
--- /dev/null
+++ b/src/audio_out.rs
@@ -0,0 +1,70 @@
+//! CS43L22 DAC with headphone amp.
+
+use crate::hal::prelude::*;
+
+use crate::hal::gpio::gpioa::{self, PA4};
+use crate::hal::gpio::gpiob::{self, PB6, PB9};
+use crate::hal::gpio::gpioc::{self, PC10, PC12};
+use crate::hal::gpio::gpiod::{self, PD4};
+use crate::hal::gpio::{Alternate, AlternateOD, Output, PushPull, AF4, AF6};
+use crate::hal::i2c::*;
+use crate::hal::i2s::*;
+use crate::hal::rcc::Clocks;
+use crate::hal::stm32::{I2C1, SPI3};
+
+use embedded_hal::blocking::delay::DelayMs;
+
+pub use cs43l22;
+
+pub struct AudioOut {
+    pub cs43l22: cs43l22::CS43L22<
+        I2c<I2C1, (PB6<AlternateOD<AF4>>, PB9<AlternateOD<AF4>>)>,
+        PD4<Output<PushPull>>,
+    >,
+    pub i2s: I2s<
+        SPI3,
+        (
+            PC10<Alternate<AF6>>,
+            PA4<Alternate<AF6>>,
+            PC12<Alternate<AF6>>,
+            NoSdExt,
+        ),
+    >,
+}
+
+impl AudioOut {
+    pub fn new<DELAY: DelayMs<u8>>(
+        i2c1: I2C1,
+        spi3: SPI3,
+        gpioa: gpioa::Parts,
+        gpiob: gpiob::Parts,
+        gpioc: gpioc::Parts,
+        gpiod: gpiod::Parts,
+        clocks: Clocks,
+        delay: &mut DELAY,
+        audio_freq: u32,
+        vol: u8,
+    ) -> Self {
+        // Setup I2C1 using PB6 and PB9 pins at 100kHz bitrate.
+        let scl = gpiob.pb6.into_alternate_af4().set_open_drain();
+        let sda = gpiob.pb9.into_alternate_af4().set_open_drain();
+        let i2c1 = I2c::i2c1(i2c1, (scl, sda), 100.khz(), clocks);
+
+        // CS43L22 reset pin.
+        let reset = gpiod.pd4.into_push_pull_output();
+
+        // Set PC7 into AF6 to output the MCLK for I2S3.
+        let _mck = gpioc.pc7.into_alternate_af6();
+
+        // Setup I2S3 for 48kHz audio.
+        let ck = gpioc.pc10.into_alternate_af6();
+        let ws = gpioa.pa4.into_alternate_af6();
+        let sd = gpioc.pc12.into_alternate_af6();
+        let i2s3 = I2s::i2s3(spi3, (ck, ws, sd, NoSdExt), audio_freq.hz(), clocks);
+
+        let cs43l22 = cs43l22::CS43L22::new(i2c1, reset, delay, vol)
+            .expect("could not create CS43L22 driver");
+
+        AudioOut { cs43l22, i2s: i2s3 }
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index a99e4c3..ac720f7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,4 +12,5 @@ pub use cortex_m::*;
 pub use cortex_m_rt::*;
 
 pub mod accelerometer;
+pub mod audio_out;
 pub mod led;