diff --git a/Cargo.toml b/Cargo.toml
index 692c72bf..ca82876d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -54,7 +54,7 @@ version = "0.6.0"
 optional = true
 
 [dependencies.synopsys-usb-otg]
-version = "0.2.4"
+version = "0.3.0"
 features = ["cortex-m", "fs"]
 optional = true
 
diff --git a/examples/otg_fs_serial.rs b/examples/otg_fs_serial.rs
index 52513420..8acc10f5 100644
--- a/examples/otg_fs_serial.rs
+++ b/examples/otg_fs_serial.rs
@@ -8,12 +8,12 @@ extern crate panic_semihosting;
 
 use cortex_m_rt::entry;
 use stm32l4xx_hal::gpio::Speed;
-use stm32l4xx_hal::otg_fs::{UsbBus, USB};
+use stm32l4xx_hal::otg_fs::{Usb, UsbBus};
 use stm32l4xx_hal::prelude::*;
 use stm32l4xx_hal::rcc::{
     ClockSecuritySystem, CrystalBypass, MsiFreq, PllConfig, PllDivider, PllSource,
 };
-use stm32l4xx_hal::stm32::{Peripherals, CRS, PWR, RCC};
+use stm32l4xx_hal::stm32::{Peripherals, CRS, RCC};
 use usb_device::prelude::*;
 
 /// Enable CRS (Clock Recovery System)
@@ -28,17 +28,6 @@ fn enable_crs() {
     crs.cr.modify(|_, w| w.cen().set_bit());
 }
 
-/// Enables VddUSB power supply
-fn enable_usb_pwr() {
-    // Enable PWR peripheral
-    let rcc = unsafe { &(*RCC::ptr()) };
-    rcc.apb1enr1.modify(|_, w| w.pwren().set_bit());
-
-    // Enable VddUSB
-    let pwr = unsafe { &*PWR::ptr() };
-    pwr.cr2.modify(|_, w| w.usv().set_bit());
-}
-
 static mut EP_MEMORY: [u32; 1024] = [0; 1024];
 
 #[entry]
@@ -83,25 +72,24 @@ unsafe fn main() -> ! {
 
     // Enable clock recovery system.
     enable_crs();
-    // Enable USB power (and disable VddUSB power isolation).
-    enable_usb_pwr();
 
     let mut gpioa = dp.GPIOA.split(&mut rcc.ahb2);
 
-    let usb = USB {
-        usb_global: dp.OTG_FS_GLOBAL,
-        usb_device: dp.OTG_FS_DEVICE,
-        usb_pwrclk: dp.OTG_FS_PWRCLK,
-        hclk: clocks.hclk(),
-        pin_dm: gpioa
+    let usb = Usb::new(
+        dp.OTG_FS_GLOBAL,
+        dp.OTG_FS_DEVICE,
+        dp.OTG_FS_PWRCLK,
+        gpioa
             .pa11
             .into_alternate(&mut gpioa.moder, &mut gpioa.otyper, &mut gpioa.afrh)
             .set_speed(Speed::VeryHigh),
-        pin_dp: gpioa
+        gpioa
             .pa12
             .into_alternate(&mut gpioa.moder, &mut gpioa.otyper, &mut gpioa.afrh)
             .set_speed(Speed::VeryHigh),
-    };
+        &mut pwr,
+        clocks,
+    );
 
     let usb_bus = UsbBus::new(usb, &mut EP_MEMORY);
 
diff --git a/src/otg_fs.rs b/src/otg_fs.rs
index 8e0f88f0..1a8eeda1 100644
--- a/src/otg_fs.rs
+++ b/src/otg_fs.rs
@@ -2,32 +2,57 @@
 //!
 //! The STM32L4 series only supports the full-speed peripheral.
 
-use crate::rcc::{Enable, Reset};
-use crate::stm32;
-
-use crate::gpio::{
-    gpioa::{PA11, PA12},
-    Alternate, PushPull,
-};
-use crate::time::Hertz;
-
 pub use synopsys_usb_otg::UsbBus;
 use synopsys_usb_otg::UsbPeripheral;
 
-pub struct USB {
-    pub usb_global: stm32::OTG_FS_GLOBAL,
-    pub usb_device: stm32::OTG_FS_DEVICE,
-    pub usb_pwrclk: stm32::OTG_FS_PWRCLK,
+use crate::{
+    gpio::{
+        gpioa::{PA11, PA12},
+        Alternate, PushPull,
+    },
+    pac,
+    pwr::Pwr,
+    rcc::{Clocks, Enable, Reset},
+    time::Hertz,
+};
+
+pub struct Usb {
+    _global: pac::OTG_FS_GLOBAL,
+    _device: pac::OTG_FS_DEVICE,
+    _pwrclk: pac::OTG_FS_PWRCLK,
     // TODO: check type
-    pub pin_dm: PA11<Alternate<PushPull, 10>>,
-    pub pin_dp: PA12<Alternate<PushPull, 10>>,
-    pub hclk: Hertz,
+    _dm: PA11<Alternate<PushPull, 10>>,
+    _dp: PA12<Alternate<PushPull, 10>>,
+    hclk: Hertz,
+}
+
+impl Usb {
+    pub fn new(
+        global: pac::OTG_FS_GLOBAL,
+        device: pac::OTG_FS_DEVICE,
+        pwrclk: pac::OTG_FS_PWRCLK,
+        dm: PA11<Alternate<PushPull, 10>>,
+        dp: PA12<Alternate<PushPull, 10>>,
+        pwr: &mut Pwr,
+        clocks: Clocks,
+    ) -> Self {
+        pwr.cr2.reg().modify(|_, w| w.usv().set_bit());
+
+        Self {
+            _global: global,
+            _device: device,
+            _pwrclk: pwrclk,
+            _dm: dm,
+            _dp: dp,
+            hclk: clocks.hclk(),
+        }
+    }
 }
 
-unsafe impl Sync for USB {}
+unsafe impl Sync for Usb {}
 
-unsafe impl UsbPeripheral for USB {
-    const REGISTERS: *const () = stm32::OTG_FS_GLOBAL::ptr() as *const ();
+unsafe impl UsbPeripheral for Usb {
+    const REGISTERS: *const () = pac::OTG_FS_GLOBAL::ptr() as *const ();
 
     const HIGH_SPEED: bool = false;
     const FIFO_DEPTH_WORDS: usize = 320;
@@ -37,10 +62,10 @@ unsafe impl UsbPeripheral for USB {
     fn enable() {
         cortex_m::interrupt::free(|_| unsafe {
             // Enable USB peripheral
-            stm32::OTG_FS_GLOBAL::enable_unchecked();
+            pac::OTG_FS_GLOBAL::enable_unchecked();
 
             // Reset USB peripheral
-            stm32::OTG_FS_GLOBAL::reset_unchecked();
+            pac::OTG_FS_GLOBAL::reset_unchecked();
         });
     }
 
@@ -49,4 +74,4 @@ unsafe impl UsbPeripheral for USB {
     }
 }
 
-pub type UsbBusType = UsbBus<USB>;
+pub type UsbBusType = UsbBus<Usb>;