Merge pull request #4100 from ckrenslehner/fix/stm32wb-low-power

fix: stm32wb55 low power feature did not compile

Author: Dirbaio

ci.sh

@@ -168,6 +168,7 @@ cargo batch \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv8m.main-none-eabihf --features stm32u5f9zj,defmt,exti,time-driver-any,time \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv8m.main-none-eabihf --features stm32u5g9nj,defmt,exti,time-driver-any,time \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32wb35ce,defmt,exti,time-driver-any,time \
+    --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32wb55rg,defmt,exti,time-driver-any,low-power,time \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv6m-none-eabi --features stm32u031r8,defmt,exti,time-driver-any,time \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv6m-none-eabi --features stm32u073mb,defmt,exti,time-driver-any,time \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv6m-none-eabi --features stm32u083rc,defmt,exti,time-driver-any,time \

embassy-stm32/src/rtc/low_power.rs

@@ -231,7 +231,15 @@ impl Rtc {
         {
             use crate::pac::EXTI;
             EXTI.rtsr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
-            EXTI.imr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
+
+            #[cfg(not(stm32wb))]
+            {
+                EXTI.imr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
+            }
+            #[cfg(stm32wb)]
+            {
+                EXTI.cpu(0).imr(0).modify(|w| w.set_line(RTC::EXTI_WAKEUP_LINE, true));
+            }
         }
         #[cfg(stm32u5)]
         {

embassy-stm32/src/rtc/v2.rs

@@ -137,7 +137,10 @@ impl SealedInstance for crate::peripherals::RTC {
     #[cfg(all(feature = "low-power", stm32l0))]
     const EXTI_WAKEUP_LINE: usize = 20;
 
-    #[cfg(all(feature = "low-power", any(stm32f4, stm32l4)))]
+    #[cfg(all(feature = "low-power", stm32wb))]
+    const EXTI_WAKEUP_LINE: usize = 19;
+
+    #[cfg(all(feature = "low-power", any(stm32f4, stm32l4, stm32wb)))]
     type WakeupInterrupt = crate::interrupt::typelevel::RTC_WKUP;
 
     #[cfg(all(feature = "low-power", stm32l0))]