diff --git a/src/crc.rs b/src/crc.rs
index 1943205..fa1bd68 100644
--- a/src/crc.rs
+++ b/src/crc.rs
@@ -21,7 +21,6 @@
 use crate::rcc::{Enable, Rcc, Reset};
 use crate::stm32::CRC;
 use core::hash::Hasher;
-use core::ptr;
 
 /// Extension trait to constrain the CRC peripheral.
 pub trait CrcExt {
@@ -175,9 +174,10 @@ impl Crc {
         let crc = unsafe { &(*CRC::ptr()) };
         for byte in data {
             unsafe {
-                // Workaround with svd2rust, it does not generate the byte interface to the DR
-                // register
-                ptr::write_volatile(&crc.dr as *const _ as *mut u8, *byte);
+                core::ptr::write_volatile(
+                    core::cell::UnsafeCell::raw_get(&crc.dr as *const _ as _),
+                    byte,
+                )
             }
         }
     }
diff --git a/src/dma.rs b/src/dma.rs
index 7c29812..1cb74fb 100644
--- a/src/dma.rs
+++ b/src/dma.rs
@@ -165,6 +165,11 @@ pub trait Channel: private::Channel {
         self.ch().ndtr.write(|w| unsafe { w.ndt().bits(len) });
     }
 
+    /// Get the number of words left to transfer.
+    fn get_transfer_remaining(&mut self) -> u16 {
+        self.ch().ndtr.read().ndt().bits()
+    }
+
     /// Set the word size.
     fn set_word_size(&mut self, wsize: WordSize) {
         self.ch().cr.modify(|_, w| unsafe {
diff --git a/src/exti.rs b/src/exti.rs
index 83cbb6f..509e5f3 100644
--- a/src/exti.rs
+++ b/src/exti.rs
@@ -169,7 +169,7 @@ impl ExtiExt for EXTI {
             SignalEdge::Rising => self.rpr1.read().bits() & mask != 0,
             SignalEdge::Falling => self.fpr1.read().bits() & mask != 0,
             SignalEdge::All => {
-                (self.rpr1.read().bits() & mask != 0) && (self.fpr1.read().bits() & mask != 0)
+                (self.rpr1.read().bits() & mask != 0) || (self.fpr1.read().bits() & mask != 0)
             }
         }
     }
diff --git a/src/gpio.rs b/src/gpio.rs
index c77dc65..c2755a4 100644
--- a/src/gpio.rs
+++ b/src/gpio.rs
@@ -445,9 +445,9 @@ macro_rules! gpio {
                             let _ = &(*$GPIOX::ptr()).pupdr.modify(|r, w| {
                                 w.bits(r.bits() & !(0b11 << offset))
                             });
-                            &(*$GPIOX::ptr()).moder.modify(|r, w| {
+                            let _ = &(*$GPIOX::ptr()).moder.modify(|r, w| {
                                 w.bits(r.bits() & !(0b11 << offset))
-                            })
+                            });
                         };
                         let offset = ($i % 4) * 8;
                         let mask = $Pxn << offset;
@@ -475,9 +475,9 @@ macro_rules! gpio {
                     pub fn set_speed(self, speed: Speed) -> Self {
                         let offset = 2 * $i;
                         unsafe {
-                            &(*$GPIOX::ptr()).ospeedr.modify(|r, w| {
+                            let _ = &(*$GPIOX::ptr()).ospeedr.modify(|r, w| {
                                 w.bits((r.bits() & !(0b11 << offset)) | ((speed as u32) << offset))
-                            })
+                            });
                         };
                         self
                     }
diff --git a/src/rtc.rs b/src/rtc.rs
index 1b4bf35..32a1e3c 100644
--- a/src/rtc.rs
+++ b/src/rtc.rs
@@ -193,10 +193,10 @@ impl Rtc {
 
     pub fn set_alarm_a(&mut self, alarm: impl Into<Alarm>) {
         let alarm = alarm.into();
-        let (dt, du) = bcd2_encode(alarm.day.unwrap_or_default() as u32);
-        let (ht, hu) = bcd2_encode(alarm.hours.unwrap_or_default() as u32);
-        let (mt, mu) = bcd2_encode(alarm.minutes.unwrap_or_default() as u32);
-        let (st, su) = bcd2_encode(alarm.seconds.unwrap_or_default() as u32);
+        let (dt, du) = bcd2_encode(alarm.day.unwrap_or_default());
+        let (ht, hu) = bcd2_encode(alarm.hours.unwrap_or_default());
+        let (mt, mu) = bcd2_encode(alarm.minutes.unwrap_or_default());
+        let (st, su) = bcd2_encode(alarm.seconds.unwrap_or_default());
 
         self.modify(|rb| {
             rb.alrmassr.write(|w| unsafe {
@@ -226,10 +226,10 @@ impl Rtc {
     }
 
     pub fn set_alarm_b(&mut self, alarm: Alarm) {
-        let (dt, du) = bcd2_encode(alarm.day.unwrap_or_default() as u32);
-        let (ht, hu) = bcd2_encode(alarm.hours.unwrap_or_default() as u32);
-        let (mt, mu) = bcd2_encode(alarm.minutes.unwrap_or_default() as u32);
-        let (st, su) = bcd2_encode(alarm.seconds.unwrap_or_default() as u32);
+        let (dt, du) = bcd2_encode(alarm.day.unwrap_or_default());
+        let (ht, hu) = bcd2_encode(alarm.hours.unwrap_or_default());
+        let (mt, mu) = bcd2_encode(alarm.minutes.unwrap_or_default());
+        let (st, su) = bcd2_encode(alarm.seconds.unwrap_or_default());
 
         self.modify(|rb| {
             rb.alrmbssr.write(|w| unsafe {
@@ -387,7 +387,7 @@ fn bcd2_encode(word: u32) -> (u8, u8) {
         bcd_high += 1;
         value -= 10;
     }
-    let bcd_low = ((bcd_high << 4) | value) as u8;
+    let bcd_low = (bcd_high << 4) | value;
     (bcd_high, bcd_low)
 }
 
diff --git a/src/spi.rs b/src/spi.rs
index bab5130..099194b 100644
--- a/src/spi.rs
+++ b/src/spi.rs
@@ -2,7 +2,7 @@ use crate::gpio::*;
 use crate::rcc::*;
 use crate::stm32::{SPI1, SPI2};
 use crate::time::Hertz;
-use core::ptr;
+use core::{cell, ptr};
 pub use hal::spi::{Mode, Phase, Polarity, MODE_0, MODE_1, MODE_2, MODE_3};
 
 /// SPI error
@@ -264,8 +264,9 @@ macro_rules! spi {
                 } else if sr.crcerr().bit_is_set() {
                     nb::Error::Other(Error::Crc)
                 } else if sr.txe().bit_is_set() {
-                    // NOTE(write_volatile) see note above
-                    unsafe { ptr::write_volatile(&self.spi.dr as *const _ as *mut u8, byte) }
+                    unsafe {
+                        ptr::write_volatile(cell::UnsafeCell::raw_get(&self.spi.dr as *const _ as _), byte)
+                    }
                     return Ok(());
                 } else {
                     nb::Error::WouldBlock
diff --git a/src/timer/pwm.rs b/src/timer/pwm.rs
index fe5ecfa..ea6c497 100644
--- a/src/timer/pwm.rs
+++ b/src/timer/pwm.rs
@@ -68,7 +68,39 @@ impl<TIM> Pwm<TIM> {
 }
 
 macro_rules! pwm {
-    ($($TIMX:ident: ($timX:ident, $arr:ident $(,$arr_h:ident)*),)+) => {
+    (b16, $TIMX:ident: ($timX:ident, $arr:ident)) => {
+        impl Pwm<$TIMX> {
+            /// Set only period register
+            pub fn set_period_register(&mut self, period: u16) {
+                unsafe {
+                    self.tim.arr.write(|w| w.$arr().bits(period as u16));
+                }
+            }
+
+            /// Get value of period register, this is often times the same as max duty cycle
+            pub fn get_period_register(&self) -> u16 {
+                self.tim.arr.read().$arr().bits() as u16
+            }
+        }
+    };
+
+    (b32, $TIMX:ident: ($timX:ident, $arr:ident, $arr_h:ident)) => {
+        impl Pwm<$TIMX> {
+            /// Set only period register
+            pub fn set_period_register(&mut self, period: u32) {
+                unsafe {
+                    self.tim.arr.write(|w| w.bits(period));
+                }
+            }
+
+            /// Get value of period register, this is often times the same as max duty cycle
+            pub fn get_period_register(&self) -> u32 {
+                self.tim.arr.read().bits()
+            }
+        }
+    };
+
+    ($($bits:ident, $TIMX:ident: ($timX:ident, $arr:ident$( ,$arr_h:ident)*),)+) => {
         $(
             impl PwmExt for $TIMX {
                 fn pwm(self, freq: Hertz, rcc: &mut Rcc) -> Pwm<Self> {
@@ -99,6 +131,8 @@ macro_rules! pwm {
                 pwm
             }
 
+            pwm!($bits, $TIMX: ($timX, $arr $(,$arr_h)*));
+
             impl Pwm<$TIMX> {
                 /// Set the PWM frequency. Actual frequency may differ from
                 /// requested due to precision of input clock. To check actual
@@ -108,15 +142,33 @@ macro_rules! pwm {
                     let psc = (ratio - 1) / 0xffff;
                     let arr = ratio / (psc + 1) - 1;
 
+                    self.set_prescaler_register(psc as _);
+                    self.set_period_register(arr as _);
+
+                    self.tim.cr1.write(|w| w.cen().set_bit());
+                }
+
+                /// Set only prescale register
+                pub fn set_prescaler_register(&mut self, prescaler: u16) {
+                    unsafe {
+                        self.tim.psc.write(|w| w.psc().bits(prescaler));
+                    }
+                }
+
+                /// Set prescaler to be able to reach `freq` or higher
+                ///
+                /// NOTE: Actual lowest reachable frequency may be lower than requested
+                /// due to rounding errors
+                /// NOTE: This will not update the period register
+                pub fn set_min_frequency(&mut self, freq: Hertz) {
+                    let ratio = self.clk / freq;
+                    let psc = (ratio - 1) / 0xffff;
+
                     unsafe {
                         self.tim.psc.write(|w| w.psc().bits(psc as u16));
-                        self.tim.arr.write(|w| w.$arr().bits(arr as u16));
-                        $(
-                            self.tim.arr.modify(|_, w| w.$arr_h().bits((arr >> 16) as u16));
-                        )*
-                        self.tim.cr1.write(|w| w.cen().set_bit())
                     }
                 }
+
                 /// Starts listening
                 pub fn listen(&mut self) {
                     self.tim.dier.write(|w| w.uie().set_bit());
@@ -131,6 +183,14 @@ macro_rules! pwm {
                     self.tim.sr.modify(|_, w| w.uif().clear_bit());
                 }
 
+                pub fn start_timer(&mut self) {
+                    self.tim.cr1.modify(|_, w| w.cen().set_bit())
+                }
+
+                pub fn pause_timer(&mut self) {
+                    self.tim.cr1.modify(|_, w| w.cen().clear_bit())
+                }
+
                 /// Resets counter value
                 pub fn reset(&mut self) {
                     self.tim.cnt.reset();
@@ -140,11 +200,11 @@ macro_rules! pwm {
                 pub fn freq(&self) -> Hertz {
                     Hertz::from_raw(self.clk.raw()
                         / (self.tim.psc.read().bits() + 1)
-                        / (self.tim.arr.read().bits() + 1))
+                        / (self.get_period_register() as u32 + 1))
                 }
             }
         )+
-    }
+    };
 }
 
 #[allow(unused_macros)]
@@ -160,14 +220,14 @@ macro_rules! pwm_q {
     }
 }
 
-#[cfg(any(feature = "stm32g0x1", feature = "stm32g070"))]
+#[cfg(any(feature = "stm32g030", feature = "stm32g0x1", feature = "stm32g070"))]
 macro_rules! pwm_hal {
     ($($TIMX:ident:
-        ($CH:ty, $ccxe:ident, $ccmrx_output:ident, $ocxpe:ident, $ocxm:ident, $ccrx:ident, $ccrx_l:ident, $ccrx_h:ident),)+
+        ($CH:ty, $ccxe:ident, $ccmrx_output:ident, $ocxpe:ident, $ocxm:ident, $ccrx:ident, $ccrx_l:ident, $ccrx_h:ident, $duty_t:ty),)+
     ) => {
         $(
             impl hal::PwmPin for PwmPin<$TIMX, $CH> {
-                type Duty = u32;
+                type Duty = $duty_t;
 
                 fn disable(&mut self) {
                     unsafe {
@@ -183,16 +243,16 @@ macro_rules! pwm_hal {
                     }
                 }
 
-                fn get_duty(&self) -> u32 {
-                    unsafe { (*$TIMX::ptr()).$ccrx.read().bits() }
+                fn get_duty(&self) -> Self::Duty {
+                    unsafe { (*$TIMX::ptr()).$ccrx.read().bits() as _ }
                 }
 
-                fn get_max_duty(&self) -> u32 {
-                    unsafe { (*$TIMX::ptr()).arr.read().bits() }
+                fn get_max_duty(&self) -> Self::Duty {
+                    unsafe { (*$TIMX::ptr()).arr.read().bits() as _ }
                 }
 
-                fn set_duty(&mut self, duty: u32) {
-                    unsafe { (*$TIMX::ptr()).$ccrx.write(|w| w.bits(duty)) }
+                fn set_duty(&mut self, duty: Self::Duty) {
+                    unsafe { (*$TIMX::ptr()).$ccrx.write(|w| w.bits(duty as u32)) }
                 }
             }
         )+
@@ -269,7 +329,7 @@ pwm_advanced_hal! {
     TIM17: (Channel1, cc1e: cc1ne, ccmr1_output, oc1pe, oc1m, ccr1, moe),
 }
 
-#[cfg(any(feature = "stm32g070"))]
+#[cfg(feature = "stm32g070")]
 pwm_advanced_hal! {
     TIM15: (Channel1, cc1e: cc1ne, ccmr1_output, oc1pe, oc1m1, ccr1, moe),
 }
@@ -281,40 +341,40 @@ pwm_advanced_hal! {
 
 #[cfg(feature = "stm32g0x1")]
 pwm_hal! {
-    TIM2: (Channel1, cc1e, ccmr1_output, oc1pe, oc1m, ccr1, ccr1_l, ccr1_h),
-    TIM2: (Channel2, cc2e, ccmr1_output, oc2pe, oc2m, ccr2, ccr2_l, ccr2_h),
-    TIM2: (Channel3, cc3e, ccmr2_output, oc3pe, oc3m, ccr3, ccr3_l, ccr3_h),
-    TIM2: (Channel4, cc4e, ccmr2_output, oc4pe, oc4m, ccr4, ccr4_l, ccr4_h),
-    TIM3: (Channel1, cc1e, ccmr1_output, oc1pe, oc1m, ccr1, ccr1_l, ccr1_h),
-    TIM3: (Channel2, cc2e, ccmr1_output, oc2pe, oc2m, ccr2, ccr2_l, ccr2_h),
-    TIM3: (Channel3, cc3e, ccmr2_output, oc3pe, oc3m, ccr3, ccr3_l, ccr3_h),
-    TIM3: (Channel4, cc4e, ccmr2_output, oc4pe, oc4m, ccr4, ccr4_l, ccr4_h),
+    TIM2: (Channel1, cc1e, ccmr1_output, oc1pe, oc1m, ccr1, ccr1_l, ccr1_h, u32),
+    TIM2: (Channel2, cc2e, ccmr1_output, oc2pe, oc2m, ccr2, ccr2_l, ccr2_h, u32),
+    TIM2: (Channel3, cc3e, ccmr2_output, oc3pe, oc3m, ccr3, ccr3_l, ccr3_h, u32),
+    TIM2: (Channel4, cc4e, ccmr2_output, oc4pe, oc4m, ccr4, ccr4_l, ccr4_h, u32),
+    TIM3: (Channel1, cc1e, ccmr1_output, oc1pe, oc1m, ccr1, ccr1_l, ccr1_h, u32),
+    TIM3: (Channel2, cc2e, ccmr1_output, oc2pe, oc2m, ccr2, ccr2_l, ccr2_h, u32),
+    TIM3: (Channel3, cc3e, ccmr2_output, oc3pe, oc3m, ccr3, ccr3_l, ccr3_h, u32),
+    TIM3: (Channel4, cc4e, ccmr2_output, oc4pe, oc4m, ccr4, ccr4_l, ccr4_h, u32),
 }
 
-#[cfg(feature = "stm32g070")]
+#[cfg(any(feature = "stm32g030", feature = "stm32g070"))]
 pwm_hal! {
-    TIM3: (Channel1, cc1e, ccmr1_output, oc1pe, oc1m, ccr1, ccr1_l, ccr1_h),
-    TIM3: (Channel2, cc2e, ccmr1_output, oc2pe, oc2m, ccr2, ccr2_l, ccr2_h),
-    TIM3: (Channel3, cc3e, ccmr2_output, oc3pe, oc3m, ccr3, ccr3_l, ccr3_h),
-    TIM3: (Channel4, cc4e, ccmr2_output, oc4pe, oc4m, ccr4, ccr4_l, ccr4_h),
+    TIM3: (Channel1, cc1e, ccmr1_output, oc1pe, oc1m, ccr1, ccr1_l, ccr1_h, u16),
+    TIM3: (Channel2, cc2e, ccmr1_output, oc2pe, oc2m, ccr2, ccr2_l, ccr2_h, u16),
+    TIM3: (Channel3, cc3e, ccmr2_output, oc3pe, oc3m, ccr3, ccr3_l, ccr3_h, u16),
+    TIM3: (Channel4, cc4e, ccmr2_output, oc4pe, oc4m, ccr4, ccr4_l, ccr4_h, u16),
 }
 
 pwm! {
-    TIM1: (tim1, arr),
-    TIM3: (tim3, arr_l, arr_h),
-    TIM14: (tim14, arr),
-    TIM16: (tim16, arr),
-    TIM17: (tim17, arr),
+    b16, TIM1: (tim1, arr),
+    b16, TIM3: (tim3, arr_l),
+    b16, TIM14: (tim14, arr),
+    b16, TIM16: (tim16, arr),
+    b16, TIM17: (tim17, arr),
 }
 
 #[cfg(feature = "stm32g0x1")]
 pwm! {
-    TIM2: (tim2, arr_l, arr_h),
+    b32, TIM2: (tim2, arr_l, arr_h),
 }
 
 #[cfg(any(feature = "stm32g070", feature = "stm32g071", feature = "stm32g081"))]
 pwm! {
-    TIM15: (tim15, arr),
+    b16, TIM15: (tim15, arr),
 }
 
 #[cfg(feature = "stm32g0x1")]