diff --git a/examples/adc_values.rs b/examples/adc_values.rs
index 12ed5f9..fbe839d 100644
--- a/examples/adc_values.rs
+++ b/examples/adc_values.rs
@@ -63,10 +63,7 @@ fn main() -> ! {
 
         // Move all components under Mutex supervision
         cortex_m::interrupt::free(move |cs| {
-            *SHARED.borrow(cs).borrow_mut() = Some(Shared {
-                adc,
-                tx,
-            });
+            *SHARED.borrow(cs).borrow_mut() = Some(Shared { adc, tx });
         });
     }
 
@@ -85,7 +82,7 @@ fn SysTick() -> ! {
         if let Some(ref mut shared) = SHARED.borrow(cs).borrow_mut().deref_mut() {
             // Read temperature data from internal sensor using ADC
             let t = hal::adc::VTemp::read(&mut shared.adc, None);
-            writeln!(shared.tx, "Temperature {}.{}C\r", t/100, t%100).ok();
+            writeln!(shared.tx, "Temperature {}.{}C\r", t / 100, t % 100).ok();
 
             // Read volatage reference data from internal sensor using ADC
             let t = hal::adc::VRef::read_vdda(&mut shared.adc);
diff --git a/src/rcc.rs b/src/rcc.rs
index a49a66c..107ecab 100644
--- a/src/rcc.rs
+++ b/src/rcc.rs
@@ -1,4 +1,3 @@
-use core::cmp;
 use crate::time::Hertz;
 
 /// Extension trait that constrains the `RCC` peripheral
@@ -112,7 +111,7 @@ impl CFGR {
         } else {
             src_clk_freq = HSI; // If no clock source is selected use HSI.
         }
-       
+
         // Pll check
         if sysclk == src_clk_freq {
             // Bypass pll if src clk and requested sysclk are the same, to save power.
@@ -121,8 +120,9 @@ impl CFGR {
             pllmul_bits = None;
             r_sysclk = src_clk_freq;
         } else {
-            let pllmul = (4 * self.sysclk.unwrap_or(src_clk_freq) + src_clk_freq) / src_clk_freq / 2;
-            let pllmul = cmp::min(cmp::max(pllmul, 2), 16);
+            let pllmul =
+                (4 * self.sysclk.unwrap_or(src_clk_freq) + src_clk_freq) / src_clk_freq / 2;
+            let pllmul = core::cmp::min(core::cmp::max(pllmul, 2), 16);
             r_sysclk = pllmul * src_clk_freq / 2;
 
             pllmul_bits = if pllmul == 2 {
@@ -182,17 +182,17 @@ impl CFGR {
         let rcc = unsafe { &*crate::stm32::RCC::ptr() };
 
         // Set up rcc based on above calculated configuration.
-       
+
         // Enable requested clock sources
         // HSI
         if self.enable_hsi {
             rcc.cr.write(|w| w.hsion().set_bit());
-            while rcc.cr.read().hsirdy().bit_is_clear() { }
+            while rcc.cr.read().hsirdy().bit_is_clear() {}
         }
         // HSI48
         if self.enable_hsi48 {
             rcc.cr2.modify(|_, w| w.hsi48on().set_bit());
-            while rcc.cr2.read().hsi48rdy().bit_is_clear() { }
+            while rcc.cr2.read().hsi48rdy().bit_is_clear() {}
         }
 
         // Enable PLL
@@ -201,15 +201,18 @@ impl CFGR {
 
             // Set PLL source based on configuration.
             if self.enable_hsi48 {
-                rcc.cfgr.modify(|_, w| w.pllsrc().bits(PllSource::HSI48 as u8));
+                rcc.cfgr
+                    .modify(|_, w| w.pllsrc().bits(PllSource::HSI48 as u8));
             } else if self.enable_hsi {
-                rcc.cfgr.modify(|_, w| w.pllsrc().bits(PllSource::HSI_DIV2 as u8));
+                rcc.cfgr
+                    .modify(|_, w| w.pllsrc().bits(PllSource::HSI_DIV2 as u8));
             } else {
-                rcc.cfgr.modify(|_, w| w.pllsrc().bits(PllSource::HSI_DIV2 as u8));
+                rcc.cfgr
+                    .modify(|_, w| w.pllsrc().bits(PllSource::HSI_DIV2 as u8));
             }
 
             rcc.cr.write(|w| w.pllon().set_bit());
-            while rcc.cr.read().pllrdy().bit_is_clear() { }
+            while rcc.cr.read().pllrdy().bit_is_clear() {}
 
             rcc.cfgr.modify(|_, w| unsafe {
                 w.ppre()
@@ -219,30 +222,40 @@ impl CFGR {
                     .sw()
                     .bits(SysClkSource::PLL as u8)
             });
-
-        } else { // No PLL required.
+        } else {
+            // No PLL required.
             // Setup requested clocks.
             if self.enable_hsi48 {
-                rcc.cfgr.modify(|_, w| unsafe { 
-                    w.ppre().bits(ppre_bits)
-                     .hpre().bits(hpre_bits)
-                     .sw().bits(SysClkSource::HSI48 as u8)
+                rcc.cfgr.modify(|_, w| unsafe {
+                    w.ppre()
+                        .bits(ppre_bits)
+                        .hpre()
+                        .bits(hpre_bits)
+                        .sw()
+                        .bits(SysClkSource::HSI48 as u8)
                 });
             } else if self.enable_hsi {
-                rcc.cfgr.modify(|_, w| unsafe { 
-                    w.ppre().bits(ppre_bits)
-                     .hpre().bits(hpre_bits)
-                     .sw().bits(SysClkSource::HSI as u8)
+                rcc.cfgr.modify(|_, w| unsafe {
+                    w.ppre()
+                        .bits(ppre_bits)
+                        .hpre()
+                        .bits(hpre_bits)
+                        .sw()
+                        .bits(SysClkSource::HSI as u8)
                 });
-            } else { // Default to HSI
+            } else {
+                // Default to HSI
                 rcc.cfgr.modify(|_, w| unsafe {
-                    w.ppre().bits(ppre_bits)
-                     .hpre().bits(hpre_bits)
-                     .sw().bits(SysClkSource::HSI as u8)
+                    w.ppre()
+                        .bits(ppre_bits)
+                        .hpre()
+                        .bits(hpre_bits)
+                        .sw()
+                        .bits(SysClkSource::HSI as u8)
                 });
             }
         }
-        
+
         Clocks {
             hclk: Hertz(hclk),
             pclk: Hertz(pclk),
diff --git a/src/serial.rs b/src/serial.rs
index 2826447..2c60e96 100644
--- a/src/serial.rs
+++ b/src/serial.rs
@@ -36,7 +36,6 @@ use embedded_hal::prelude::*;
 #[allow(unused)]
 use crate::{gpio::*, rcc::Clocks, time::Bps};
 
-
 /// Serial error
 #[derive(Debug)]
 pub enum Error {
diff --git a/src/spi.rs b/src/spi.rs
index f781c77..0254133 100644
--- a/src/spi.rs
+++ b/src/spi.rs
@@ -281,11 +281,13 @@ impl<SPI, SCKPIN, MISOPIN, MOSIPIN> ::embedded_hal::blocking::spi::transfer::Def
     for Spi<SPI, SCKPIN, MISOPIN, MOSIPIN>
 where
     SPI: Deref<Target = SpiRegisterBlock>,
-{}
+{
+}
 
 #[cfg(feature = "device-selected")]
 impl<SPI, SCKPIN, MISOPIN, MOSIPIN> ::embedded_hal::blocking::spi::write::Default<u8>
     for Spi<SPI, SCKPIN, MISOPIN, MOSIPIN>
 where
     SPI: Deref<Target = SpiRegisterBlock>,
-{}
+{
+}