Add System Off and Wake on Field

embassy-nrf/src/lib.rs

@@ -107,6 +107,9 @@ pub mod nvmc;
 ))]
 pub mod pdm;
 #[cfg(not(feature = "_nrf54l"))] // TODO
+#[cfg(any(feature = "nrf52840", feature = "nrf9160-s", feature = "nrf9160-ns"))]
+pub mod power;
+#[cfg(not(feature = "_nrf54l"))] // TODO
 pub mod ppi;
 #[cfg(not(feature = "_nrf54l"))] // TODO
 #[cfg(not(any(

embassy-nrf/src/power.rs

@@ -0,0 +1,22 @@
+//! Power
+
+#[cfg(feature = "nrf52840")]
+use crate::chip::pac::NFCT;
+#[cfg(feature = "nrf52840")]
+use crate::chip::pac::POWER;
+#[cfg(any(feature = "nrf9160-s", feature = "nrf9160-ns"))]
+use crate::chip::pac::REGULATORS;
+
+/// Puts the MCU into "System Off" mode with minimal power usage
+pub fn set_system_off() {
+    #[cfg(feature = "nrf52840")]
+    POWER.systemoff().write(|w| w.set_systemoff(true));
+    #[cfg(any(feature = "nrf9160-s", feature = "nrf9160-ns"))]
+    REGULATORS.systemoff().write(|w| w.set_systemoff(true));
+}
+
+/// Wake the system if there if an NFC field close to the nrf52840's antenna
+#[cfg(feature = "nrf52840")]
+pub fn wake_on_nfc_sense() {
+    NFCT.tasks_sense().write_value(0x01);
+}