feat: initial support for nrf54 CRACEN peripheral

The CRACEN peripheral supports random number generation,
digest and key generation, and key exchange.

The initial support implements random number generation.

1 files changed, 29 insertions, 0 deletions

diff --git a/examples/nrf54l15/src/bin/rng.rs b/examples/nrf54l15/src/bin/rng.rs
new file mode 100644
index 000000000..3be035b9c
--- /dev/null
+++ b/examples/nrf54l15/src/bin/rng.rs
@@ -0,0 +1,29 @@
+#![no_std]
+#![no_main]
+
+use embassy_executor::Spawner;
+use embassy_nrf::cracen::Cracen;
+use embassy_nrf::{bind_interrupts, cracen, peripherals};
+use rand::Rng as _;
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_nrf::init(Default::default());
+    let mut rng = Cracen::new_blocking(p.CRACEN);
+
+    // Async API
+    let mut bytes = [0; 4];
+    rng.blocking_fill_bytes(&mut bytes);
+    defmt::info!("Some random bytes: {:?}", bytes);
+
+    // Sync API with `rand`
+    defmt::info!("A random number from 1 to 10: {:?}", rng.random_range(1..=10));
+
+    let mut bytes = [0; 1024];
+    rng.blocking_fill_bytes(&mut bytes);
+    let zero_count: u32 = bytes.iter().fold(0, |acc, val| acc + val.count_zeros());
+    let one_count: u32 = bytes.iter().fold(0, |acc, val| acc + val.count_ones());
+    defmt::info!("Chance of zero: {}%", zero_count * 100 / (bytes.len() as u32 * 8));
+    defmt::info!("Chance of one: {}%", one_count * 100 / (bytes.len() as u32 * 8));
+}