diff --git a/boards/grand_central_m4/Cargo.toml b/boards/grand_central_m4/Cargo.toml
index 639e2efd1c0..f0cb37bf38a 100644
--- a/boards/grand_central_m4/Cargo.toml
+++ b/boards/grand_central_m4/Cargo.toml
@@ -15,11 +15,11 @@ version = "0.7"
 optional = true
 
 [dependencies.atsamd-hal]
-version = "0.17.0"
+version = "0.18"
 default-features = false
 
 [dependencies.usb-device]
-version = "0.3"
+version = "0.3.2"
 optional = true
 
 [dependencies.cortex-m]
@@ -47,10 +47,10 @@ chip = "ATSAMD51P20A"
 name = "blinky_basic"
 
 [[example]]
-name = "neopixel_rainbow"
+name = "eic"
 
 [[example]]
-name = "eic"
+name = "neopixel_rainbow"
 
 [[example]]
 name = "usb_serial"
diff --git a/boards/grand_central_m4/examples/blinky_basic.rs b/boards/grand_central_m4/examples/blinky_basic.rs
index f10f25e9e62..e54bdf4fba7 100644
--- a/boards/grand_central_m4/examples/blinky_basic.rs
+++ b/boards/grand_central_m4/examples/blinky_basic.rs
@@ -23,13 +23,13 @@ fn main() -> ! {
     let mut peripherals = Peripherals::take().unwrap();
     let core = CorePeripherals::take().unwrap();
     let mut clocks = GenericClockController::with_external_32kosc(
-        peripherals.GCLK,
-        &mut peripherals.MCLK,
-        &mut peripherals.OSC32KCTRL,
-        &mut peripherals.OSCCTRL,
-        &mut peripherals.NVMCTRL,
+        peripherals.gclk,
+        &mut peripherals.mclk,
+        &mut peripherals.osc32kctrl,
+        &mut peripherals.oscctrl,
+        &mut peripherals.nvmctrl,
     );
-    let pins = bsp::Pins::new(peripherals.PORT);
+    let pins = bsp::Pins::new(peripherals.port);
     let mut red_led: bsp::RedLed = pin_alias!(pins.red_led).into();
     let mut delay = Delay::new(core.SYST, &mut clocks);
     loop {
diff --git a/boards/grand_central_m4/examples/eic.rs b/boards/grand_central_m4/examples/eic.rs
index cec3c24fba2..3749760d340 100644
--- a/boards/grand_central_m4/examples/eic.rs
+++ b/boards/grand_central_m4/examples/eic.rs
@@ -48,13 +48,13 @@ fn main() -> ! {
     let mut peripherals = Peripherals::take().unwrap();
     let mut core = CorePeripherals::take().unwrap();
     let mut clocks = GenericClockController::with_internal_32kosc(
-        peripherals.GCLK,
-        &mut peripherals.MCLK,
-        &mut peripherals.OSC32KCTRL,
-        &mut peripherals.OSCCTRL,
-        &mut peripherals.NVMCTRL,
+        peripherals.gclk,
+        &mut peripherals.mclk,
+        &mut peripherals.osc32kctrl,
+        &mut peripherals.oscctrl,
+        &mut peripherals.nvmctrl,
     );
-    let pins = bsp::Pins::new(peripherals.PORT);
+    let pins = bsp::Pins::new(peripherals.port);
     free(|cs| {
         RED_LED
             .borrow(cs)
@@ -65,11 +65,11 @@ fn main() -> ! {
 
     let gclk0 = clocks.gclk0();
     let eic_clock = clocks.eic(&gclk0).unwrap();
-    let mut eic = eic::init_with_ulp32k(&mut peripherals.MCLK, eic_clock, peripherals.EIC);
+    let mut eic = eic::init_with_ulp32k(&mut peripherals.mclk, eic_clock, peripherals.eic);
     let button: Pin<_, PullUpInterrupt> = pins.d46.into();
     eic.button_debounce_pins(&[button.id()]);
     let mut extint_button = ExtInt6::new(button);
-    extint_button.sense(&mut eic, Sense::BOTH);
+    extint_button.sense(&mut eic, Sense::Both);
     extint_button.enable_interrupt(&mut eic);
     eic.finalize();
 
@@ -95,9 +95,9 @@ fn EIC_EXTINT_6() {
     // clear the interrupt and toggle the led
     let eic = unsafe {
         // Accessing registers from interrupts context is safe
-        &*pac::EIC::ptr()
+        &*pac::Eic::ptr()
     };
-    eic.intflag
+    eic.intflag()
         .modify(|r, w| unsafe { w.bits(r.bits() | 1 << 6) });
     toggle_led();
 }
diff --git a/boards/grand_central_m4/examples/neopixel_rainbow.rs b/boards/grand_central_m4/examples/neopixel_rainbow.rs
index fac68bb1078..83136824643 100644
--- a/boards/grand_central_m4/examples/neopixel_rainbow.rs
+++ b/boards/grand_central_m4/examples/neopixel_rainbow.rs
@@ -31,18 +31,18 @@ fn main() -> ! {
     let mut peripherals = Peripherals::take().unwrap();
     let core = CorePeripherals::take().unwrap();
     let mut clocks = GenericClockController::with_external_32kosc(
-        peripherals.GCLK,
-        &mut peripherals.MCLK,
-        &mut peripherals.OSC32KCTRL,
-        &mut peripherals.OSCCTRL,
-        &mut peripherals.NVMCTRL,
+        peripherals.gclk,
+        &mut peripherals.mclk,
+        &mut peripherals.osc32kctrl,
+        &mut peripherals.oscctrl,
+        &mut peripherals.nvmctrl,
     );
     let gclk0 = clocks.gclk0();
     let tc2_3 = clocks.tc2_tc3(&gclk0).unwrap();
-    let mut timer = TimerCounter::tc3_(&tc2_3, peripherals.TC3, &mut peripherals.MCLK);
+    let mut timer = TimerCounter::tc3_(&tc2_3, peripherals.tc3, &mut peripherals.mclk);
     timer.start(Hertz::MHz(3).into_duration());
 
-    let pins = bsp::Pins::new(peripherals.PORT);
+    let pins = bsp::Pins::new(peripherals.port);
     let neopixel_pin = pins.neopixel.into_push_pull_output();
     let mut neopixel = ws2812::Ws2812::new(timer, neopixel_pin);
     let mut delay = Delay::new(core.SYST, &mut clocks);
diff --git a/boards/grand_central_m4/examples/usb_serial.rs b/boards/grand_central_m4/examples/usb_serial.rs
index 5f2ca6bbe7d..bb46d4be12e 100644
--- a/boards/grand_central_m4/examples/usb_serial.rs
+++ b/boards/grand_central_m4/examples/usb_serial.rs
@@ -43,27 +43,27 @@ fn main() -> ! {
     let mut peripherals = Peripherals::take().unwrap();
     let mut core = CorePeripherals::take().unwrap();
     let mut clocks = GenericClockController::with_internal_32kosc(
-        peripherals.GCLK,
-        &mut peripherals.MCLK,
-        &mut peripherals.OSC32KCTRL,
-        &mut peripherals.OSCCTRL,
-        &mut peripherals.NVMCTRL,
+        peripherals.gclk,
+        &mut peripherals.mclk,
+        &mut peripherals.osc32kctrl,
+        &mut peripherals.oscctrl,
+        &mut peripherals.nvmctrl,
     );
     let gclk0 = clocks.gclk0();
     let tc2_3 = clocks.tc2_tc3(&gclk0).unwrap();
-    let mut timer = TimerCounter::tc3_(&tc2_3, peripherals.TC3, &mut peripherals.MCLK);
+    let mut timer = TimerCounter::tc3_(&tc2_3, peripherals.tc3, &mut peripherals.mclk);
     InterruptDrivenTimer::start(&mut timer, Hertz::MHz(3).into_duration());
 
-    let pins = bsp::Pins::new(peripherals.PORT);
+    let pins = bsp::Pins::new(peripherals.port);
     let neopixel_pin = pins.neopixel.into_push_pull_output();
     let mut neopixel = ws2812::Ws2812::new(timer, neopixel_pin);
     let _ = neopixel.write((0..5).map(|_| RGB8::default()));
 
     let bus_allocator = unsafe {
         USB_ALLOCATOR = Some(bsp::usb_allocator(
-            peripherals.USB,
+            peripherals.usb,
             &mut clocks,
-            &mut peripherals.MCLK,
+            &mut peripherals.mclk,
             pins.usb_dm,
             pins.usb_dp,
         ));
diff --git a/boards/grand_central_m4/src/lib.rs b/boards/grand_central_m4/src/lib.rs
index a39e55ac867..6e2db4a9e1d 100644
--- a/boards/grand_central_m4/src/lib.rs
+++ b/boards/grand_central_m4/src/lib.rs
@@ -22,18 +22,18 @@ use hal::{
     time::Hertz,
 };
 
-use pac::MCLK;
+use pac::Mclk;
 
 #[cfg(feature = "usb")]
 use hal::usb::{usb_device::bus::UsbBusAllocator, UsbBus};
 
 hal::bsp_peripherals!(
-    SERCOM0 { UartSercom }
-    SERCOM1 { UartSercom2 }
-    SERCOM5 { UartSercom3 }
-    SERCOM3 { I2cSercom }
-    SERCOM6 { I2cSercom2 }
-    SERCOM7 { SpiSercom }
+    Sercom0 { UartSercom }
+    Sercom1 { UartSercom2 }
+    Sercom5 { UartSercom3 }
+    Sercom3 { I2cSercom }
+    Sercom6 { I2cSercom2 }
+    Sercom7 { SpiSercom }
 );
 
 hal::bsp_pins!(
@@ -495,7 +495,7 @@ pub fn spi_master(
     clocks: &mut GenericClockController,
     baud: Hertz,
     sercom7: SpiSercom,
-    mclk: &mut pac::MCLK,
+    mclk: &mut pac::Mclk,
     sclk: impl Into<Sclk>,
     mosi: impl Into<Mosi>,
     miso: impl Into<Miso>,
@@ -516,8 +516,8 @@ pub fn spi_master(
 /// assuming 120MHz system clock, for 4MHz QSPI mode 0 operation.
 #[allow(clippy::too_many_arguments)]
 pub fn qspi_master(
-    mclk: &mut MCLK,
-    qspi: pac::QSPI,
+    mclk: &mut Mclk,
+    qspi: pac::Qspi,
     sclk: impl Into<FlashSclk>,
     cs: impl Into<FlashCs>,
     data0: impl Into<FlashD0>,
@@ -555,7 +555,7 @@ pub fn i2c_master(
     clocks: &mut GenericClockController,
     baud: impl Into<Hertz>,
     sercom: I2cSercom,
-    mclk: &mut pac::MCLK,
+    mclk: &mut pac::Mclk,
     sda: impl Into<Sda>,
     scl: impl Into<Scl>,
 ) -> I2c {
@@ -581,7 +581,7 @@ pub fn uart(
     clocks: &mut GenericClockController,
     baud: impl Into<Hertz>,
     sercom: UartSercom,
-    mclk: &mut pac::MCLK,
+    mclk: &mut pac::Mclk,
     uart_rx: impl Into<UartRx>,
     uart_tx: impl Into<UartTx>,
 ) -> Uart {
@@ -597,16 +597,16 @@ pub fn uart(
 #[cfg(feature = "usb")]
 /// Convenience function for setting up USB
 pub fn usb_allocator(
-    usb: pac::USB,
+    usb: pac::Usb,
     clocks: &mut GenericClockController,
-    mclk: &mut pac::MCLK,
+    mclk: &mut pac::Mclk,
     dm: impl Into<UsbDm>,
     dp: impl Into<UsbDp>,
 ) -> UsbBusAllocator<UsbBus> {
-    use pac::gclk::{genctrl::SRCSELECT_A, pchctrl::GENSELECT_A};
+    use pac::gclk::{genctrl::Srcselect, pchctrl::Genselect};
 
-    clocks.configure_gclk_divider_and_source(GENSELECT_A::GCLK2, 1, SRCSELECT_A::DFLL, false);
-    let usb_gclk = clocks.get_gclk(GENSELECT_A::GCLK2).unwrap();
+    clocks.configure_gclk_divider_and_source(Genselect::Gclk2, 1, Srcselect::Dfll, false);
+    let usb_gclk = clocks.get_gclk(Genselect::Gclk2).unwrap();
     let usb_clock = &clocks.usb(&usb_gclk).unwrap();
     let (dm, dp) = (dm.into(), dp.into());
     UsbBusAllocator::new(UsbBus::new(usb_clock, mclk, dm, dp, usb))