diff --git a/examples/tiva-c-connected-launchpad/src/main.rs b/examples/tiva-c-connected-launchpad/src/main.rs
index 7dfc08d..44ce78c 100644
--- a/examples/tiva-c-connected-launchpad/src/main.rs
+++ b/examples/tiva-c-connected-launchpad/src/main.rs
@@ -1,12 +1,11 @@
 #![no_std]
 #![no_main]
 
-extern crate panic_halt; // you can put a breakpoint on `rust_begin_unwind` to catch panics
-extern crate tm4c129x_hal as hal;
+use panic_halt as _; // you can put a breakpoint on `rust_begin_unwind` to catch panics
 
 use core::fmt::Write;
 use cortex_m_rt::entry;
-use hal::prelude::*;
+use tm4c129x_hal::{self as hal, prelude::*};
 
 #[entry]
 fn main() -> ! {
diff --git a/examples/tiva-c-launchpad/src/main.rs b/examples/tiva-c-launchpad/src/main.rs
index 103e540..60539ed 100644
--- a/examples/tiva-c-launchpad/src/main.rs
+++ b/examples/tiva-c-launchpad/src/main.rs
@@ -1,12 +1,11 @@
 #![no_std]
 #![no_main]
 
-extern crate panic_halt; // you can put a breakpoint on `rust_begin_unwind` to catch panics
-extern crate tm4c123x_hal as hal;
+use panic_halt as _; // you can put a breakpoint on `rust_begin_unwind` to catch panics
 
 use core::fmt::Write;
 use cortex_m_rt::entry;
-use hal::prelude::*;
+use tm4c123x_hal::{self as hal, prelude::*};
 
 #[entry]
 fn main() -> ! {
diff --git a/tm4c-hal/src/delay.rs b/tm4c-hal/src/delay.rs
index c8643cd..e7b7ae8 100644
--- a/tm4c-hal/src/delay.rs
+++ b/tm4c-hal/src/delay.rs
@@ -1,10 +1,7 @@
 //! Code for busy-waiting
 
-use crate::sysctl::Clocks;
-use crate::time::Hertz;
-use cast::u32;
-use cortex_m::peripheral::syst::SystClkSource;
-use cortex_m::peripheral::SYST;
+use crate::{sysctl::Clocks, time::Hertz};
+use cortex_m::peripheral::{syst::SystClkSource, SYST};
 use embedded_hal::blocking::delay::{DelayMs, DelayUs};
 
 /// System timer (SysTick) as a delay provider
@@ -38,13 +35,13 @@ impl DelayMs<u32> for Delay {
 
 impl DelayMs<u16> for Delay {
     fn delay_ms(&mut self, ms: u16) {
-        self.delay_ms(u32(ms));
+        self.delay_ms(cast::u32(ms));
     }
 }
 
 impl DelayMs<u8> for Delay {
     fn delay_ms(&mut self, ms: u8) {
-        self.delay_ms(u32(ms));
+        self.delay_ms(cast::u32(ms));
     }
 }
 
@@ -75,12 +72,12 @@ impl DelayUs<u32> for Delay {
 
 impl DelayUs<u16> for Delay {
     fn delay_us(&mut self, us: u16) {
-        self.delay_us(u32(us))
+        self.delay_us(cast::u32(us))
     }
 }
 
 impl DelayUs<u8> for Delay {
     fn delay_us(&mut self, us: u8) {
-        self.delay_us(u32(us))
+        self.delay_us(cast::u32(us))
     }
 }
diff --git a/tm4c-hal/src/lib.rs b/tm4c-hal/src/lib.rs
index 7da121e..ec1af60 100644
--- a/tm4c-hal/src/lib.rs
+++ b/tm4c-hal/src/lib.rs
@@ -1,13 +1,9 @@
 //! Generic implementation code for both TM4C123 and TM4C129.
 
 #![no_std]
-#![deny(missing_docs)]
-#![deny(warnings)]
+#![deny(missing_docs, warnings)]
 #![allow(deprecated)]
 
-extern crate embedded_hal as hal;
-extern crate nb;
-
 pub mod bb;
 pub mod delay;
 pub mod gpio;
diff --git a/tm4c123x-hal/src/gpio.rs b/tm4c123x-hal/src/gpio.rs
index 449f56f..60ccddb 100644
--- a/tm4c123x-hal/src/gpio.rs
+++ b/tm4c123x-hal/src/gpio.rs
@@ -34,9 +34,11 @@
 
 pub use tm4c_hal::gpio::*;
 
-use crate::bb;
-use crate::hal::digital::{InputPin, OutputPin, StatefulOutputPin};
-use crate::sysctl;
+use crate::{
+    bb,
+    hal::digital::{InputPin, OutputPin, StatefulOutputPin},
+    sysctl,
+};
 use core::marker::PhantomData;
 use tm4c_hal::gpio_macro;
 
diff --git a/tm4c123x-hal/src/i2c.rs b/tm4c123x-hal/src/i2c.rs
index 93c3328..95899c0 100644
--- a/tm4c123x-hal/src/i2c.rs
+++ b/tm4c123x-hal/src/i2c.rs
@@ -3,17 +3,18 @@
 use cortex_m::asm::delay;
 use tm4c123x::{I2C0, I2C1, I2C2, I2C3};
 
-use crate::gpio::gpioa::{PA6, PA7};
-use crate::gpio::gpiob::{PB2, PB3};
-use crate::gpio::gpiod::{PD0, PD1};
-use crate::gpio::gpioe::{PE4, PE5};
-
-use crate::gpio::{AlternateFunction, Floating, OpenDrain, OutputMode, AF3};
-
-use crate::sysctl::{self, Clocks};
-
-use crate::hal::blocking::i2c::{Read, Write, WriteRead};
-use crate::time::Hertz;
+use crate::{
+    gpio::{
+        gpioa::{PA6, PA7},
+        gpiob::{PB2, PB3},
+        gpiod::{PD0, PD1},
+        gpioe::{PE4, PE5},
+        AlternateFunction, Floating, OpenDrain, OutputMode, AF3,
+    },
+    hal::blocking::i2c::{Read, Write, WriteRead},
+    sysctl::{self, Clocks},
+    time::Hertz,
+};
 
 /// I2C error
 #[derive(Debug)]
diff --git a/tm4c123x-hal/src/lib.rs b/tm4c123x-hal/src/lib.rs
index 74b62cf..0d39774 100644
--- a/tm4c123x-hal/src/lib.rs
+++ b/tm4c123x-hal/src/lib.rs
@@ -19,14 +19,14 @@
 //!
 //! [`f3`]: https://docs.rs/f3/~0.5.1
 
-#![deny(missing_docs)]
-#![deny(warnings)]
+#![deny(missing_docs, warnings)]
 #![allow(deprecated)]
 #![no_std]
 
-pub use tm4c_hal::bb;
-pub use tm4c_hal::delay;
-pub use tm4c_hal::time;
+pub use tm4c123x::{self, CorePeripherals, Peripherals};
+pub use tm4c_hal::{bb, delay, time};
+
+use embedded_hal as hal;
 
 pub mod gpio;
 pub mod i2c;
@@ -35,8 +35,3 @@ pub mod serial;
 pub mod spi;
 pub mod sysctl;
 pub mod timer;
-
-extern crate embedded_hal as hal;
-extern crate nb;
-pub use tm4c123x;
-pub use tm4c123x::{CorePeripherals, Peripherals};
diff --git a/tm4c123x-hal/src/prelude.rs b/tm4c123x-hal/src/prelude.rs
index 9914822..ef0ec85 100644
--- a/tm4c123x-hal/src/prelude.rs
+++ b/tm4c123x-hal/src/prelude.rs
@@ -1,6 +1,9 @@
 //! Prelude
 
-pub use crate::gpio::GpioExt as _tm4c123x_hal_gpio_GpioExt;
-pub use crate::hal::prelude::*;
-pub use crate::sysctl::SysctlExt;
-pub use crate::time::U32Ext;
+#[rustfmt::skip]
+pub use crate::{
+    gpio::GpioExt as _,
+    hal::prelude::*,
+    sysctl::SysctlExt,
+    time::U32Ext,
+};
diff --git a/tm4c123x-hal/src/serial.rs b/tm4c123x-hal/src/serial.rs
index 8b387fd..4dc8404 100644
--- a/tm4c123x-hal/src/serial.rs
+++ b/tm4c123x-hal/src/serial.rs
@@ -1,26 +1,23 @@
 //! Serial
 
-use core::fmt;
-use core::marker::PhantomData;
-
-use crate::hal::prelude::*;
-use crate::hal::serial;
-use nb::{self, block};
 pub use tm4c123x::{UART0, UART1, UART2, UART3, UART4, UART5, UART6, UART7};
+pub use tm4c_hal::{serial::*, uart_hal_macro, uart_pin_macro};
+
+#[rustfmt::skip]
+use crate::{
+    gpio::{
+        gpioa, gpiob, gpioc, gpiod, gpioe, gpiof,
+        AlternateFunction, OutputMode, AF1, AF2, AF8,
+    },
+    hal::{prelude::*, serial},
+    sysctl,
+    sysctl::Clocks,
+    time::Bps,
+};
+use core::{fmt, marker::PhantomData};
+use nb::{self, block};
 use void::Void;
 
-use crate::gpio::{gpioa, gpiob, gpioc, gpiod, gpioe, gpiof};
-use crate::gpio::{AlternateFunction, OutputMode, AF1, AF2, AF8};
-use crate::sysctl;
-use crate::sysctl::Clocks;
-use crate::time::Bps;
-
-pub use tm4c_hal::serial::*;
-
-pub use tm4c_hal::serial::*;
-
-pub use tm4c_hal::{uart_hal_macro, uart_pin_macro};
-
 /// Serial abstraction
 pub struct Serial<UART, TX, RX, RTS, CTS> {
     uart: UART,
diff --git a/tm4c123x-hal/src/spi.rs b/tm4c123x-hal/src/spi.rs
index de33bf0..1365784 100644
--- a/tm4c123x-hal/src/spi.rs
+++ b/tm4c123x-hal/src/spi.rs
@@ -2,14 +2,18 @@
 
 pub use crate::hal::spi::{Mode, MODE_0, MODE_1, MODE_2, MODE_3};
 
-use crate::gpio::gpioa::{PA2, PA4, PA5};
-use crate::gpio::gpiob::{PB4, PB6, PB7};
-use crate::gpio::gpiod::{PD0, PD2, PD3};
-use crate::gpio::{AlternateFunction, OutputMode, AF1, AF2};
-use crate::hal::spi::{FullDuplex, Phase, Polarity};
-use crate::sysctl;
-use crate::sysctl::Clocks;
-use crate::time::Hertz;
+use crate::{
+    gpio::{
+        gpioa::{PA2, PA4, PA5},
+        gpiob::{PB4, PB6, PB7},
+        gpiod::{PD0, PD2, PD3},
+        AlternateFunction, OutputMode, AF1, AF2,
+    },
+    hal::spi::{FullDuplex, Phase, Polarity},
+    sysctl,
+    sysctl::Clocks,
+    time::Hertz,
+};
 
 use nb;
 use tm4c123x::{SSI0, SSI1, SSI2, SSI3};
diff --git a/tm4c123x-hal/src/sysctl.rs b/tm4c123x-hal/src/sysctl.rs
index d6450e1..f8b3fb3 100644
--- a/tm4c123x-hal/src/sysctl.rs
+++ b/tm4c123x-hal/src/sysctl.rs
@@ -21,12 +21,14 @@
 //!
 //! See the LM4F120 datasheet, page 228 for a full list.
 
-use crate::bb;
-use crate::time::{Hertz, U32Ext};
-use cortex_m::asm::nop;
-
 pub use tm4c_hal::sysctl::*;
 
+use crate::{
+    bb,
+    time::{Hertz, U32Ext},
+};
+use cortex_m::asm::nop;
+
 /// Constrained SYSCTL peripheral.
 pub struct Sysctl {
     /// Power control methods will require `&mut this.power_control` to
diff --git a/tm4c123x-hal/src/timer.rs b/tm4c123x-hal/src/timer.rs
index 38a86ca..36c6d7b 100644
--- a/tm4c123x-hal/src/timer.rs
+++ b/tm4c123x-hal/src/timer.rs
@@ -1,16 +1,17 @@
 //! Timers
 
-extern crate embedded_hal as hal;
-
-use tm4c_hal::time::Hertz;
-
-use crate::sysctl;
-use hal::timer::{CountDown, Periodic};
+use crate::{
+    hal::timer::{CountDown, Periodic},
+    sysctl::{self, Clocks},
+};
 use nb;
-use tm4c123x::{TIMER0, TIMER1, TIMER2, TIMER3, TIMER4, TIMER5};
-use tm4c123x::{WTIMER0, WTIMER1, WTIMER2, WTIMER3, WTIMER4, WTIMER5};
 
-use crate::sysctl::Clocks;
+#[rustfmt::skip]
+use tm4c123x::{
+    TIMER0, TIMER1, TIMER2, TIMER3, TIMER4, TIMER5,
+    WTIMER0, WTIMER1, WTIMER2, WTIMER3, WTIMER4, WTIMER5,
+};
+use tm4c_hal::time::Hertz;
 use void::Void;
 
 /// Hardware timers
diff --git a/tm4c129x-hal/src/gpio.rs b/tm4c129x-hal/src/gpio.rs
index 0919a6d..19bee11 100644
--- a/tm4c129x-hal/src/gpio.rs
+++ b/tm4c129x-hal/src/gpio.rs
@@ -36,9 +36,11 @@
 
 pub use tm4c_hal::gpio::*;
 
-use crate::bb;
-use crate::hal::digital::{InputPin, OutputPin, StatefulOutputPin};
-use crate::sysctl;
+use crate::{
+    bb,
+    hal::digital::{InputPin, OutputPin, StatefulOutputPin},
+    sysctl,
+};
 use core::marker::PhantomData;
 use tm4c_hal::gpio_macro;
 
diff --git a/tm4c129x-hal/src/i2c.rs b/tm4c129x-hal/src/i2c.rs
index 6b9012b..6a3f6a5 100644
--- a/tm4c129x-hal/src/i2c.rs
+++ b/tm4c129x-hal/src/i2c.rs
@@ -1,10 +1,11 @@
 //! Inter-Integrated Circuit (I2C) bus
 
-use crate::gpio::*;
-use crate::gpio::{AlternateFunction, Floating, OpenDrain, OutputMode, AF3};
-use crate::hal::blocking::i2c::{Read, Write, WriteRead};
-use crate::sysctl::{self, Clocks};
-use crate::time::Hertz;
+use crate::{
+    gpio::*,
+    hal::blocking::i2c::{Read, Write, WriteRead},
+    sysctl::{self, Clocks},
+    time::Hertz,
+};
 use cortex_m::asm::delay;
 use tm4c129x::{I2C0, I2C1, I2C2, I2C3};
 
diff --git a/tm4c129x-hal/src/lib.rs b/tm4c129x-hal/src/lib.rs
index 0847a65..f887b6a 100644
--- a/tm4c129x-hal/src/lib.rs
+++ b/tm4c129x-hal/src/lib.rs
@@ -25,9 +25,8 @@
 #![deny(warnings)]
 #![allow(deprecated)]
 
-pub use tm4c_hal::bb;
-pub use tm4c_hal::delay;
-pub use tm4c_hal::time;
+pub use tm4c129x::{self, CorePeripherals, Peripherals};
+pub use tm4c_hal::{bb, delay, time};
 
 pub mod gpio;
 pub mod i2c;
@@ -37,5 +36,3 @@ pub mod serial;
 pub mod sysctl;
 
 use embedded_hal as hal;
-pub use tm4c129x;
-pub use tm4c129x::{CorePeripherals, Peripherals};
diff --git a/tm4c129x-hal/src/prelude.rs b/tm4c129x-hal/src/prelude.rs
index 6a42b23..ef0ec85 100644
--- a/tm4c129x-hal/src/prelude.rs
+++ b/tm4c129x-hal/src/prelude.rs
@@ -1,6 +1,9 @@
 //! Prelude
 
-pub use crate::gpio::GpioExt as _tm4c129x_hal_gpio_GpioExt;
-pub use crate::hal::prelude::*;
-pub use crate::sysctl::SysctlExt;
-pub use crate::time::U32Ext;
+#[rustfmt::skip]
+pub use crate::{
+    gpio::GpioExt as _,
+    hal::prelude::*,
+    sysctl::SysctlExt,
+    time::U32Ext,
+};
diff --git a/tm4c129x-hal/src/serial.rs b/tm4c129x-hal/src/serial.rs
index 0c3ba9c..2f0df59 100644
--- a/tm4c129x-hal/src/serial.rs
+++ b/tm4c129x-hal/src/serial.rs
@@ -1,23 +1,18 @@
 //! Serial
 
-use core::fmt;
-use core::marker::PhantomData;
-
-use crate::hal::prelude::*;
-use crate::hal::serial;
+use core::{fmt, marker::PhantomData};
+
+use crate::{
+    gpio::*,
+    hal::{prelude::*, serial},
+    sysctl::{self, Clocks},
+    time::Bps,
+};
 use nb::{self, block};
-pub use tm4c129x::{UART0, UART1, UART2, UART3, UART4, UART5, UART6, UART7};
 use void::Void;
 
-use crate::gpio::*;
-use crate::gpio::{AlternateFunction, OutputMode, AF1};
-use crate::sysctl;
-use crate::sysctl::Clocks;
-use crate::time::Bps;
-
-pub use tm4c_hal::serial::*;
-
-pub use tm4c_hal::{uart_hal_macro, uart_pin_macro};
+pub use tm4c129x::{UART0, UART1, UART2, UART3, UART4, UART5, UART6, UART7};
+pub use tm4c_hal::{serial::*, uart_hal_macro, uart_pin_macro};
 
 /// Serial abstraction
 pub struct Serial<UART, TX, RX, RTS, CTS> {
diff --git a/tm4c129x-hal/src/spi.rs b/tm4c129x-hal/src/spi.rs
index 4432250..01b6a79 100644
--- a/tm4c129x-hal/src/spi.rs
+++ b/tm4c129x-hal/src/spi.rs
@@ -2,14 +2,17 @@
 
 pub use crate::hal::spi::{Mode, MODE_0, MODE_1, MODE_2, MODE_3};
 
-use crate::gpio::gpioa::{PA2, PA4, PA5};
-use crate::gpio::gpiob::{PB4, PB6, PB7};
-use crate::gpio::gpiod::{PD0, PD2, PD3};
-use crate::gpio::{AlternateFunction, OutputMode, AF1, AF2};
-use crate::hal::spi::{FullDuplex, Phase, Polarity};
-use crate::sysctl;
-use crate::sysctl::Clocks;
-use crate::time::Hertz;
+use crate::{
+    gpio::{
+        gpioa::{PA2, PA4, PA5},
+        gpiob::{PB4, PB6, PB7},
+        gpiod::{PD0, PD2, PD3},
+        AlternateFunction, OutputMode, AF1, AF2,
+    },
+    hal::spi::{FullDuplex, Phase, Polarity},
+    sysctl::{self, Clocks},
+    time::Hertz,
+};
 
 use nb;
 use tm4c129x::{SSI0, SSI1, SSI2, SSI3};
diff --git a/tm4c129x-hal/src/sysctl.rs b/tm4c129x-hal/src/sysctl.rs
index 48efd16..c0e379f 100644
--- a/tm4c129x-hal/src/sysctl.rs
+++ b/tm4c129x-hal/src/sysctl.rs
@@ -21,12 +21,14 @@
 //!
 //! See the LM4F120 datasheet, page 228 for a full list.
 
-use crate::bb;
-use crate::time::{Hertz, U32Ext};
-use cortex_m::asm::nop;
-
 pub use tm4c_hal::sysctl::*;
 
+use crate::{
+    bb,
+    time::{Hertz, U32Ext},
+};
+use cortex_m::asm::nop;
+
 /// Constrained SYSCTL peripheral.
 pub struct Sysctl {
     /// Power control methods will require `&mut this.power_control` to