4 files changed, 25 insertions, 7 deletions

diff --git a/embassy-stm32/CHANGELOG.md b/embassy-stm32/CHANGELOG.md
index a9ab78e31..71989eb3d 100644
--- a/embassy-stm32/CHANGELOG.md
+++ b/embassy-stm32/CHANGELOG.md
@@ -38,6 +38,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - fix: usart: fix race condition in ringbuffered usart
 - feat: stm32/fdcan: add ability to control automatic recovery from bus off ([#4821](https://github.com/embassy-rs/embassy/pull/4821))
 - low-power: update rtc api to allow reconfig
+- feat: Added RTC low-power support for STM32WLEx ([#4716](https://github.com/embassy-rs/embassy/pull/4716))
 
 ## 0.4.0 - 2025-08-26
 
diff --git a/embassy-stm32/src/low_power.rs b/embassy-stm32/src/low_power.rs
index 74cd11b93..3eb626abe 100644
--- a/embassy-stm32/src/low_power.rs
+++ b/embassy-stm32/src/low_power.rs
@@ -127,10 +127,10 @@ pub enum StopMode {
     Stop2,
 }
 
-#[cfg(any(stm32l4, stm32l5, stm32u5, stm32wba, stm32u0))]
+#[cfg(any(stm32l4, stm32l5, stm32u5, stm32wba, stm32wlex, stm32u0))]
 use stm32_metapac::pwr::vals::Lpms;
 
-#[cfg(any(stm32l4, stm32l5, stm32u5, stm32wba, stm32u0))]
+#[cfg(any(stm32l4, stm32l5, stm32u5, stm32wba, stm32wlex, stm32u0))]
 impl Into<Lpms> for StopMode {
     fn into(self) -> Lpms {
         match self {
@@ -207,7 +207,7 @@ impl Executor {
 
     #[allow(unused_variables)]
     fn configure_stop(&mut self, stop_mode: StopMode) {
-        #[cfg(any(stm32l4, stm32l5, stm32u5, stm32u0, stm32wba))]
+        #[cfg(any(stm32l4, stm32l5, stm32u5, stm32u0, stm32wba, stm32wlex))]
         crate::pac::PWR.cr1().modify(|m| m.set_lpms(stop_mode.into()));
         #[cfg(stm32h5)]
         crate::pac::PWR.pmcr().modify(|v| {
@@ -219,6 +219,11 @@ impl Executor {
 
     fn configure_pwr(&mut self) {
         self.scb.clear_sleepdeep();
+        // Clear any previous stop flags
+        #[cfg(stm32wlex)]
+        crate::pac::PWR.extscr().modify(|w| {
+            w.set_c1cssf(true);
+        });
 
         compiler_fence(Ordering::SeqCst);
 
@@ -270,8 +275,20 @@ impl Executor {
         loop {
             unsafe {
                 executor.inner.poll();
+                trace!("low power: calling configure_pwr");
                 self.configure_pwr();
+                trace!("low power: after configure_pwr");
+
                 asm!("wfe");
+
+                trace!("low power: awake from 'wfe'");
+                #[cfg(stm32wlex)]
+                {
+                    let es = crate::pac::PWR.extscr().read();
+                    trace!("low power: C1SBF: {}", es.c1sbf());
+                    trace!("low power: C1STOPF: {}", es.c1stopf());
+                    trace!("low power: C1STOP2F: {}", es.c1stop2f());
+                }
             };
         }
     }
diff --git a/embassy-stm32/src/rtc/low_power.rs b/embassy-stm32/src/rtc/low_power.rs
index 9e0f03879..e09d5afb0 100644
--- a/embassy-stm32/src/rtc/low_power.rs
+++ b/embassy-stm32/src/rtc/low_power.rs
@@ -68,7 +68,7 @@ pub(crate) enum WakeupPrescaler {
 }
 
 #[cfg(any(
-    stm32f4, stm32l0, stm32g4, stm32l4, stm32l5, stm32wb, stm32h5, stm32g0, stm32u5, stm32u0, stm32wba
+    stm32f4, stm32l0, stm32g4, stm32l4, stm32l5, stm32wb, stm32h5, stm32g0, stm32u5, stm32u0, stm32wba, stm32wlex
 ))]
 impl From<WakeupPrescaler> for crate::pac::rtc::vals::Wucksel {
     fn from(val: WakeupPrescaler) -> Self {
@@ -84,7 +84,7 @@ impl From<WakeupPrescaler> for crate::pac::rtc::vals::Wucksel {
 }
 
 #[cfg(any(
-    stm32f4, stm32l0, stm32g4, stm32l4, stm32l5, stm32wb, stm32h5, stm32g0, stm32u5, stm32u0, stm32wba
+    stm32f4, stm32l0, stm32g4, stm32l4, stm32l5, stm32wb, stm32h5, stm32g0, stm32u5, stm32u0, stm32wba, stm32wlex
 ))]
 impl From<crate::pac::rtc::vals::Wucksel> for WakeupPrescaler {
     fn from(val: crate::pac::rtc::vals::Wucksel) -> Self {
diff --git a/embassy-stm32/src/rtc/v3.rs b/embassy-stm32/src/rtc/v3.rs
index 528dc78b4..f7ebea73e 100644
--- a/embassy-stm32/src/rtc/v3.rs
+++ b/embassy-stm32/src/rtc/v3.rs
@@ -131,7 +131,7 @@ impl SealedInstance for crate::peripherals::RTC {
 
     #[cfg(feature = "low-power")]
     cfg_if::cfg_if!(
-        if #[cfg(stm32g4)] {
+        if #[cfg(any(stm32g4, stm32wlex))] {
             const EXTI_WAKEUP_LINE: usize = 20;
         } else if #[cfg(stm32g0)] {
             const EXTI_WAKEUP_LINE: usize = 19;
@@ -142,7 +142,7 @@ impl SealedInstance for crate::peripherals::RTC {
 
     #[cfg(feature = "low-power")]
     cfg_if::cfg_if!(
-        if #[cfg(stm32g4)] {
+        if #[cfg(any(stm32g4, stm32wlex))] {
             type WakeupInterrupt = crate::interrupt::typelevel::RTC_WKUP;
         } else if #[cfg(any(stm32g0, stm32u0))] {
             type WakeupInterrupt = crate::interrupt::typelevel::RTC_TAMP;