From d9cd93ca228b7d4d38066d88b50ff06bb7a5297a Mon Sep 17 00:00:00 2001
From: Gerzain Mata <gmata@axon.com>
Date: Fri, 18 Jul 2025 14:23:52 -0700
Subject: Added RTC low-power support for STM32WBA65

Also added low-power feature for STM32WBA65RI build
---
 embassy-stm32/src/rtc/low_power.rs | 12 +++++++++---
 embassy-stm32/src/rtc/mod.rs       |  2 +-
 embassy-stm32/src/rtc/v3.rs        |  2 +-
 3 files changed, 11 insertions(+), 5 deletions(-)

(limited to 'embassy-stm32/src')

diff --git a/embassy-stm32/src/rtc/low_power.rs b/embassy-stm32/src/rtc/low_power.rs
index cd075f3de..78ccd3e6c 100644
--- a/embassy-stm32/src/rtc/low_power.rs
+++ b/embassy-stm32/src/rtc/low_power.rs
@@ -66,7 +66,7 @@ pub(crate) enum WakeupPrescaler {
 }
 
 #[cfg(any(
-    stm32f4, stm32l0, stm32g4, stm32l4, stm32l5, stm32wb, stm32h5, stm32g0, stm32u5, stm32u0
+    stm32f4, stm32l0, stm32g4, stm32l4, stm32l5, stm32wb, stm32h5, stm32g0, stm32u5, stm32u0, stm32wba
 ))]
 impl From<WakeupPrescaler> for crate::pac::rtc::vals::Wucksel {
     fn from(val: WakeupPrescaler) -> Self {
@@ -82,7 +82,7 @@ impl From<WakeupPrescaler> for crate::pac::rtc::vals::Wucksel {
 }
 
 #[cfg(any(
-    stm32f4, stm32l0, stm32g4, stm32l4, stm32l5, stm32wb, stm32h5, stm32g0, stm32u5, stm32u0
+    stm32f4, stm32l0, stm32g4, stm32l4, stm32l5, stm32wb, stm32h5, stm32g0, stm32u5, stm32u0, stm32wba
 ))]
 impl From<crate::pac::rtc::vals::Wucksel> for WakeupPrescaler {
     fn from(val: crate::pac::rtc::vals::Wucksel) -> Self {
@@ -227,7 +227,7 @@ impl Rtc {
         <RTC as crate::rtc::SealedInstance>::WakeupInterrupt::unpend();
         unsafe { <RTC as crate::rtc::SealedInstance>::WakeupInterrupt::enable() };
 
-        #[cfg(not(any(stm32u5, stm32u0)))]
+        #[cfg(not(any(stm32u5, stm32u0, stm32wba)))]
         {
             use crate::pac::EXTI;
             EXTI.rtsr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
@@ -247,5 +247,11 @@ impl Rtc {
             RCC.srdamr().modify(|w| w.set_rtcapbamen(true));
             RCC.apb3smenr().modify(|w| w.set_rtcapbsmen(true));
         }
+        #[cfg(stm32wba)]
+        {
+            use crate::pac::RCC;
+            // RCC.srdamr().modify(|w| w.set_rtcapbamen(true));
+            RCC.apb7smenr().modify(|w| w.set_rtcapbsmen(true));
+        }
     }
 }
diff --git a/embassy-stm32/src/rtc/mod.rs b/embassy-stm32/src/rtc/mod.rs
index 2c5aaca35..449f3008a 100644
--- a/embassy-stm32/src/rtc/mod.rs
+++ b/embassy-stm32/src/rtc/mod.rs
@@ -296,7 +296,7 @@ trait SealedInstance {
     const BACKUP_REGISTER_COUNT: usize;
 
     #[cfg(feature = "low-power")]
-    #[cfg(not(any(stm32u5, stm32u0)))]
+    #[cfg(not(any(stm32wba, stm32u5, stm32u0)))]
     const EXTI_WAKEUP_LINE: usize;
 
     #[cfg(feature = "low-power")]
diff --git a/embassy-stm32/src/rtc/v3.rs b/embassy-stm32/src/rtc/v3.rs
index 39aa6c5cb..d0b52049e 100644
--- a/embassy-stm32/src/rtc/v3.rs
+++ b/embassy-stm32/src/rtc/v3.rs
@@ -146,7 +146,7 @@ impl SealedInstance for crate::peripherals::RTC {
             type WakeupInterrupt = crate::interrupt::typelevel::RTC_WKUP;
         } else if #[cfg(any(stm32g0, stm32u0))] {
             type WakeupInterrupt = crate::interrupt::typelevel::RTC_TAMP;
-        } else if #[cfg(any(stm32l5, stm32h5, stm32u5))] {
+        } else if #[cfg(any(stm32l5, stm32h5, stm32u5, stm32wba))] {
             type WakeupInterrupt = crate::interrupt::typelevel::RTC;
         }
     );
-- 
cgit