Merge pull request #4616 from OBauck/ole/nrf54l-init-low-power

nrf54l: Disable glitch detection and enable DC/DC in init.

2 files changed, 19 insertions, 0 deletions

diff --git a/embassy-nrf/CHANGELOG.md b/embassy-nrf/CHANGELOG.md
index 4e0887b0d..5dc941b25 100644
--- a/embassy-nrf/CHANGELOG.md
+++ b/embassy-nrf/CHANGELOG.md
@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 <!-- next-header -->
 ## Unreleased - ReleaseDate
 
+- changed: nrf54l: Disable glitch detection and enable DC/DC in init.
+
 ## 0.7.0 - 2025-08-26
 
 - bugfix: use correct analog input SAADC pins on nrf5340
diff --git a/embassy-nrf/src/lib.rs b/embassy-nrf/src/lib.rs
index 2b72debeb..aa4801897 100644
--- a/embassy-nrf/src/lib.rs
+++ b/embassy-nrf/src/lib.rs
@@ -707,6 +707,14 @@ pub fn init(config: config::Config) -> Peripherals {
         }
     }
 
+    // GLITCHDET is only accessible for secure code
+    #[cfg(all(feature = "_nrf54l", feature = "_s"))]
+    {
+        // The voltage glitch detectors are automatically enabled after reset.
+        // To save power, the glitch detectors must be disabled when not in use.
+        pac::GLITCHDET.config().write(|w| w.set_enable(false));
+    }
+
     // Setup debug protection.
     #[cfg(not(feature = "_nrf51"))]
     match config.debug {
@@ -1083,6 +1091,15 @@ pub fn init(config: config::Config) -> Peripherals {
             reg.vregradio().dcdcen().write(|w| w.set_dcdcen(true));
         }
     }
+    #[cfg(feature = "_nrf54l")]
+    {
+        // Turn on DCDC
+        // From Product specification:
+        // "Once the device starts, the DC/DC regulator must be enabled using register VREGMAIN.DCDCEN.
+        // When enabling the DC/DC regulator, the device checks if an inductor is connected to the DCC pin.
+        // If an inductor is not detected, the device remains in LDO mode"
+        pac::REGULATORS.vregmain().dcdcen().write(|w| w.set_val(true));
+    }
 
     // Init GPIOTE
     #[cfg(not(feature = "_nrf54l"))] // TODO