diff --git a/embassy-stm32/src/adc/f1.rs b/embassy-stm32/src/adc/f1.rs
index 56d1a2f3..8a3b4be5 100644
--- a/embassy-stm32/src/adc/f1.rs
+++ b/embassy-stm32/src/adc/f1.rs
@@ -146,14 +146,11 @@ impl<'d, T: Instance> Adc<'d, T> {
     }
 
     unsafe fn set_channel_sample_time(ch: u8, sample_time: SampleTime) {
+        let sample_time = sample_time.into();
         if ch <= 9 {
-            T::regs()
-                .smpr2()
-                .modify(|reg| reg.set_smp(ch as _, sample_time.sample_time()));
+            T::regs().smpr2().modify(|reg| reg.set_smp(ch as _, sample_time));
         } else {
-            T::regs()
-                .smpr1()
-                .modify(|reg| reg.set_smp((ch - 10) as _, sample_time.sample_time()));
+            T::regs().smpr1().modify(|reg| reg.set_smp((ch - 10) as _, sample_time));
         }
     }
 }
diff --git a/embassy-stm32/src/adc/mod.rs b/embassy-stm32/src/adc/mod.rs
index 35d84f97..328470ef 100644
--- a/embassy-stm32/src/adc/mod.rs
+++ b/embassy-stm32/src/adc/mod.rs
@@ -8,11 +8,10 @@
 #[cfg_attr(adc_v1, path = "v1.rs")]
 mod _version;
 
-#[cfg(not(adc_v1))]
-mod sample_time;
-
 #[cfg(not(any(adc_f1, adc_v1)))]
 mod resolution;
+#[cfg(not(adc_v1))]
+mod sample_time;
 
 #[allow(unused)]
 pub use _version::*;
diff --git a/embassy-stm32/src/adc/resolution.rs b/embassy-stm32/src/adc/resolution.rs
index 354cabfb..62b52a46 100644
--- a/embassy-stm32/src/adc/resolution.rs
+++ b/embassy-stm32/src/adc/resolution.rs
@@ -1,4 +1,5 @@
 #[cfg(any(adc_v2, adc_v3, adc_g0))]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum Resolution {
     TwelveBit,
     TenBit,
@@ -7,6 +8,7 @@ pub enum Resolution {
 }
 
 #[cfg(adc_v4)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum Resolution {
     SixteenBit,
     FourteenBit,
@@ -28,9 +30,9 @@ impl Default for Resolution {
     }
 }
 
-impl Resolution {
-    pub(super) fn res(&self) -> crate::pac::adc::vals::Res {
-        match self {
+impl From<Resolution> for crate::pac::adc::vals::Res {
+    fn from(res: Resolution) -> crate::pac::adc::vals::Res {
+        match res {
             #[cfg(adc_v4)]
             Resolution::SixteenBit => crate::pac::adc::vals::Res::SIXTEENBIT,
             #[cfg(adc_v4)]
@@ -42,7 +44,9 @@ impl Resolution {
             Resolution::SixBit => crate::pac::adc::vals::Res::SIXBIT,
         }
     }
+}
 
+impl Resolution {
     pub fn to_max_count(&self) -> u32 {
         match self {
             #[cfg(adc_v4)]
diff --git a/embassy-stm32/src/adc/sample_time.rs b/embassy-stm32/src/adc/sample_time.rs
index 1850d80f..60ba8004 100644
--- a/embassy-stm32/src/adc/sample_time.rs
+++ b/embassy-stm32/src/adc/sample_time.rs
@@ -9,10 +9,10 @@ macro_rules! impl_sample_time {
             )*
         }
 
-        impl SampleTime {
-            pub(crate) fn sample_time(&self) -> $pac {
-                match self {
-                    $(Self::$variant => <$pac>::$pac_variant),*
+        impl From<SampleTime> for $pac {
+            fn from(sample_time: SampleTime) -> $pac {
+                match sample_time {
+                    $(SampleTime::$variant => <$pac>::$pac_variant),*
                 }
             }
         }
diff --git a/embassy-stm32/src/adc/v2.rs b/embassy-stm32/src/adc/v2.rs
index e2678fe4..30ac5d87 100644
--- a/embassy-stm32/src/adc/v2.rs
+++ b/embassy-stm32/src/adc/v2.rs
@@ -214,7 +214,7 @@ where
 
     unsafe fn read_channel(&mut self, channel: u8) -> u16 {
         // Configure ADC
-        T::regs().cr1().modify(|reg| reg.set_res(self.resolution.res()));
+        T::regs().cr1().modify(|reg| reg.set_res(self.resolution.into()));
 
         // Select channel
         T::regs().sqr3().write(|reg| reg.set_sq(0, channel));
@@ -228,14 +228,11 @@ where
     }
 
     unsafe fn set_channel_sample_time(ch: u8, sample_time: SampleTime) {
+        let sample_time = sample_time.into();
         if ch <= 9 {
-            T::regs()
-                .smpr2()
-                .modify(|reg| reg.set_smp(ch as _, sample_time.sample_time()));
+            T::regs().smpr2().modify(|reg| reg.set_smp(ch as _, sample_time));
         } else {
-            T::regs()
-                .smpr1()
-                .modify(|reg| reg.set_smp((ch - 10) as _, sample_time.sample_time()));
+            T::regs().smpr1().modify(|reg| reg.set_smp((ch - 10) as _, sample_time));
         }
     }
 }
diff --git a/embassy-stm32/src/adc/v3.rs b/embassy-stm32/src/adc/v3.rs
index 7bc130e5..7962f241 100644
--- a/embassy-stm32/src/adc/v3.rs
+++ b/embassy-stm32/src/adc/v3.rs
@@ -199,9 +199,9 @@ impl<'d, T: Instance> Adc<'d, T> {
 
             // Configure ADC
             #[cfg(not(stm32g0))]
-            T::regs().cfgr().modify(|reg| reg.set_res(self.resolution.res()));
+            T::regs().cfgr().modify(|reg| reg.set_res(self.resolution.into()));
             #[cfg(stm32g0)]
-            T::regs().cfgr1().modify(|reg| reg.set_res(self.resolution.res()));
+            T::regs().cfgr1().modify(|reg| reg.set_res(self.resolution.into()));
 
             // Configure channel
             Self::set_channel_sample_time(pin.channel(), self.sample_time);
@@ -231,19 +231,16 @@ impl<'d, T: Instance> Adc<'d, T> {
 
     #[cfg(stm32g0)]
     unsafe fn set_channel_sample_time(_ch: u8, sample_time: SampleTime) {
-        T::regs().smpr().modify(|reg| reg.set_smp1(sample_time.sample_time()));
+        T::regs().smpr().modify(|reg| reg.set_smp1(sample_time.into()));
     }
 
     #[cfg(not(stm32g0))]
     unsafe fn set_channel_sample_time(ch: u8, sample_time: SampleTime) {
+        let sample_time = sample_time.into();
         if ch <= 9 {
-            T::regs()
-                .smpr1()
-                .modify(|reg| reg.set_smp(ch as _, sample_time.sample_time()));
+            T::regs().smpr1().modify(|reg| reg.set_smp(ch as _, sample_time));
         } else {
-            T::regs()
-                .smpr2()
-                .modify(|reg| reg.set_smp((ch - 10) as _, sample_time.sample_time()));
+            T::regs().smpr2().modify(|reg| reg.set_smp((ch - 10) as _, sample_time));
         }
     }
 }
diff --git a/embassy-stm32/src/adc/v4.rs b/embassy-stm32/src/adc/v4.rs
index 9dc5318e..dc5f62d3 100644
--- a/embassy-stm32/src/adc/v4.rs
+++ b/embassy-stm32/src/adc/v4.rs
@@ -409,7 +409,7 @@ impl<'d, T: Instance + crate::rcc::RccPeripheral> Adc<'d, T> {
 
     unsafe fn read_channel(&mut self, channel: u8) -> u16 {
         // Configure ADC
-        T::regs().cfgr().modify(|reg| reg.set_res(self.resolution.res()));
+        T::regs().cfgr().modify(|reg| reg.set_res(self.resolution.into()));
 
         // Configure channel
         Self::set_channel_sample_time(channel, self.sample_time);
@@ -427,14 +427,11 @@ impl<'d, T: Instance + crate::rcc::RccPeripheral> Adc<'d, T> {
     }
 
     unsafe fn set_channel_sample_time(ch: u8, sample_time: SampleTime) {
+        let sample_time = sample_time.into();
         if ch <= 9 {
-            T::regs()
-                .smpr(0)
-                .modify(|reg| reg.set_smp(ch as _, sample_time.sample_time()));
+            T::regs().smpr(0).modify(|reg| reg.set_smp(ch as _, sample_time));
         } else {
-            T::regs()
-                .smpr(1)
-                .modify(|reg| reg.set_smp((ch - 10) as _, sample_time.sample_time()));
+            T::regs().smpr(1).modify(|reg| reg.set_smp((ch - 10) as _, sample_time));
         }
     }
 }