diff --git a/src/audio.rs b/src/audio.rs
index 3c036cc..c39d62f 100644
--- a/src/audio.rs
+++ b/src/audio.rs
@@ -1,3 +1,4 @@
+use crate::codec::{Codec, Pins as CodecPins};
 use defmt::info;
 use defmt::unwrap;
 use embassy_stm32 as hal;
@@ -14,8 +15,6 @@ use hal::{
     },
     time::Hertz,
 };
-use crate::codec::{Codec, Pins as CodecPins};
-
 
 // - global constants ---------------------------------------------------------
 
@@ -47,8 +46,8 @@ pub struct AudioPeripherals {
 
 impl AudioPeripherals {
     pub async fn prepare_interface<'a>(self, audio_config: AudioConfig) -> Interface<'a> {
-
-        #[cfg(feature = "seed_1_1")] {
+        #[cfg(feature = "seed_1_1")]
+        {
             info!("set up i2c");
             let i2c_config = hal::i2c::Config::default();
             let mut i2c = embassy_stm32::i2c::I2c::new_blocking(
@@ -77,7 +76,7 @@ impl AudioPeripherals {
             sai_rx_config.frame_length = 64;
             sai_rx_config.frame_sync_active_level_length = embassy_stm32::sai::word::U7(32);
             sai_rx_config.fifo_threshold = FifoThreshold::Quarter;
-    
+
             let mut sai_tx_config = sai_rx_config;
             sai_tx_config.mode = Mode::Slave;
             sai_tx_config.tx_rx = TxRx::Transmitter;
@@ -99,7 +98,6 @@ impl AudioPeripherals {
                 sai_tx_config,
             );
 
-
             let rx_buffer: &mut [u32] = unsafe {
                 RX_BUFFER.initialize_all_copied(0);
                 let (ptr, len) = RX_BUFFER.get_ptr_len();
@@ -126,7 +124,8 @@ impl AudioPeripherals {
             }
         }
 
-        #[cfg(feature = "seed_1_2")] {
+        #[cfg(feature = "seed_1_2")]
+        {
             let (sub_block_tx, sub_block_rx) = hal::sai::split_subblocks(self.sai1);
             let mut sai_tx_config = hal::sai::Config::default();
             sai_tx_config.mode = Mode::Master;
@@ -142,7 +141,7 @@ impl AudioPeripherals {
             sai_tx_config.frame_length = 64;
             sai_tx_config.frame_sync_active_level_length = embassy_stm32::sai::word::U7(32);
             sai_tx_config.fifo_threshold = FifoThreshold::Quarter;
-        
+
             let mut sai_rx_config = sai_tx_config.clone();
             sai_rx_config.mode = Mode::Slave;
             sai_rx_config.tx_rx = TxRx::Receiver;
@@ -150,14 +149,12 @@ impl AudioPeripherals {
             sai_rx_config.clock_strobe = ClockStrobe::Rising;
             sai_rx_config.sync_output = false;
 
-                    
             let tx_buffer: &mut [u32] = unsafe {
                 TX_BUFFER.initialize_all_copied(0);
                 let (ptr, len) = TX_BUFFER.get_ptr_len();
                 core::slice::from_raw_parts_mut(ptr, len)
             };
 
-
             let rx_buffer: &mut [u32] = unsafe {
                 RX_BUFFER.initialize_all_copied(0);
                 let (ptr, len) = RX_BUFFER.get_ptr_len();
@@ -175,7 +172,11 @@ impl AudioPeripherals {
                 sai_tx_config,
             );
             let sai_rx = Sai::new_synchronous(
-                sub_block_rx, self.codec_pins.SD_B, self.dma1_ch1, rx_buffer, sai_rx_config
+                sub_block_rx,
+                self.codec_pins.SD_B,
+                self.dma1_ch1,
+                rx_buffer,
+                sai_rx_config,
             );
 
             Interface {
@@ -183,13 +184,12 @@ impl AudioPeripherals {
                 sai_tx_config,
                 sai_rx,
                 sai_tx,
-                i2c: None,  // pcm3060 'hardware mode' doesn't need i2c
+                i2c: None, // pcm3060 'hardware mode' doesn't need i2c
             }
         }
     }
 }
 
-
 pub struct Interface<'a> {
     sai_tx_config: sai::Config,
     sai_rx_config: sai::Config,
@@ -213,7 +213,7 @@ impl<'a> Interface<'a> {
     pub fn sai_rx_config(&self) -> &sai::Config {
         &self.sai_rx_config
     }
-    
+
     pub fn sai_tx_config(&self) -> &sai::Config {
         &self.sai_tx_config
     }
@@ -231,23 +231,22 @@ impl<'a> Interface<'a> {
     }
 
     async fn setup(&mut self) {
-        #[cfg(feature = "seed_1_1")] {
+        #[cfg(feature = "seed_1_1")]
+        {
             info!("setup WM8731");
             Codec::write_wm8731_reg(
-                &mut self.i2c.as_mut().unwrap(),
+                self.i2c.as_mut().unwrap(),
                 wm8731::WM8731::power_down(Codec::final_power_settings),
             );
             Timer::after_micros(10).await;
         }
 
-        
         info!("start SAI");
         self.sai_tx.start();
         self.sai_rx.start();
     }
 }
 
-
 #[derive(Clone, Copy)]
 pub enum Fs {
     Fs8000,
@@ -274,7 +273,6 @@ impl Fs {
     }
 }
 
-
 pub struct AudioConfig {
     pub fs: Fs,
 }
diff --git a/src/codec/wm8731.rs b/src/codec/wm8731.rs
index b1b69eb..1d63074 100644
--- a/src/codec/wm8731.rs
+++ b/src/codec/wm8731.rs
@@ -1,8 +1,8 @@
 use embassy_stm32 as hal;
 use hal::peripherals::*;
 
-use embassy_time::Timer;
 use defmt::{info, unwrap};
+use embassy_time::Timer;
 
 use crate::audio::Fs;
 
@@ -121,7 +121,7 @@ impl Codec {
 
     pub fn write_wm8731_reg(i2c: &mut hal::i2c::I2c<'_, hal::mode::Blocking>, r: wm8731::Register) {
         const AD: u8 = 0x1a; // or 0x1b if CSB is high
-    
+
         // WM8731 has 16 bits registers.
         // The first 7 bits are for the addresses, and the rest 9 bits are for the "value"s.
         // Let's pack wm8731::Register into 16 bits.
diff --git a/src/lib.rs b/src/lib.rs
index 53cab81..6d05720 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -35,10 +35,9 @@ compile_error!(
     "target board must be selected using a feature: \"seed_1_2\" | \"seed_1_1\" | \"seed\" | \"patch_sm\""
 );
 
-
 pub mod audio;
-pub mod codec;
 pub mod board;
+pub mod codec;
 pub mod flash;
 pub mod led;
 pub mod pins;
@@ -46,8 +45,8 @@ pub mod sdram;
 pub mod usb;
 
 pub use board::DaisyBoard;
-pub use embassy_stm32 as hal;
 pub use codec::{Codec, Pins as CodecPins};
+pub use embassy_stm32 as hal;
 
 pub fn default_rcc() -> hal::Config {
     let mut config = hal::Config::default();
@@ -135,7 +134,6 @@ macro_rules! new_daisy_board {
             audio_peripherals: daisy_embassy::audio::AudioPeripherals {
                 codec: daisy_embassy::Codec {},
                 codec_pins: daisy_embassy::CodecPins {
-
                     // For audio, I2C only needed for WM8731
                     #[cfg(feature = "seed_1_1")]
                     SCL: $p.PH4,