stm32: add low-power mod

embassy-stm32/src/lib.rs

@@ -47,6 +47,8 @@ pub mod i2c;
 pub mod i2s;
 #[cfg(stm32wb)]
 pub mod ipcc;
+#[cfg(feature = "low-power")]
+pub mod low_power;
 #[cfg(quadspi)]
 pub mod qspi;
 #[cfg(rng)]

embassy-stm32/src/low_power.rs

@@ -0,0 +1,15 @@
+use crate::rtc::{Rtc, RtcInstant};
+
+static mut RTC: Option<&'static Rtc> = None;
+
+pub fn stop_with_rtc(rtc: &'static Rtc) {
+    unsafe { RTC = Some(rtc) };
+}
+
+pub fn start_wakeup_alarm(requested_duration: embassy_time::Duration) -> RtcInstant {
+    unsafe { RTC }.unwrap().start_wakeup_alarm(requested_duration)
+}
+
+pub fn stop_wakeup_alarm() -> RtcInstant {
+    unsafe { RTC }.unwrap().stop_wakeup_alarm()
+}