From fee793cbf8a0bdd020636ce433cc0883105dd2db Mon Sep 17 00:00:00 2001
From: Felipe Balbi <febalbi@microsoft.com>
Date: Mon, 8 Dec 2025 10:16:42 -0800
Subject: MCXA TRNG driver

---
 examples/mcxa/Cargo.toml      |  1 +
 examples/mcxa/src/bin/trng.rs | 88 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 89 insertions(+)
 create mode 100644 examples/mcxa/src/bin/trng.rs

(limited to 'examples/mcxa')

diff --git a/examples/mcxa/Cargo.toml b/examples/mcxa/Cargo.toml
index d07cc4272..347659f5b 100644
--- a/examples/mcxa/Cargo.toml
+++ b/examples/mcxa/Cargo.toml
@@ -21,6 +21,7 @@ embassy-time-driver = "0.2.1"
 embedded-io-async = "0.6.1"
 heapless = "0.9.2"
 panic-probe = { version = "1.0", features = ["print-defmt"] }
+rand_core = "0.9"
 static_cell = "2.1.1"
 tmp108 = "0.4.0"
 
diff --git a/examples/mcxa/src/bin/trng.rs b/examples/mcxa/src/bin/trng.rs
new file mode 100644
index 000000000..95b4d0a88
--- /dev/null
+++ b/examples/mcxa/src/bin/trng.rs
@@ -0,0 +1,88 @@
+#![no_std]
+#![no_main]
+
+use embassy_executor::Spawner;
+use hal::bind_interrupts;
+use hal::config::Config;
+use hal::trng::{self, AsyncTrng, InterruptHandler, Trng};
+use rand_core::RngCore;
+use {defmt_rtt as _, embassy_mcxa as hal, panic_probe as _};
+
+bind_interrupts!(
+    struct Irqs {
+        TRNG0 => InterruptHandler;
+    }
+);
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let config = Config::default();
+    let mut p = hal::init(config);
+
+    defmt::info!("TRNG example");
+
+    let config = trng::Config::default();
+    let mut trng = Trng::new(p.TRNG0.reborrow(), config);
+
+    defmt::info!("========== BLOCKING ==========");
+
+    defmt::info!("Generate 10 u32");
+    for _ in 0..10 {
+        let rand = trng.blocking_next_u32();
+        defmt::info!("{}", rand);
+    }
+
+    defmt::info!("Generate 10 u64");
+    for _ in 0..10 {
+        let rand = trng.blocking_next_u64();
+        defmt::info!("{}", rand);
+    }
+
+    let mut buf = [0_u8; 256];
+
+    defmt::info!("Generate 10 256-byte buffers");
+    for _ in 0..10 {
+        trng.blocking_fill_bytes(&mut buf);
+        defmt::info!("{:02x}", buf);
+    }
+
+    defmt::info!("RngCore");
+
+    for _ in 0..10 {
+        defmt::info!("u32: {}", trng.next_u32());
+        defmt::info!("u64: {}", trng.next_u64());
+    }
+
+    drop(trng);
+
+    defmt::info!("========== ASYNC ==========");
+
+    let mut trng = AsyncTrng::new(p.TRNG0.reborrow(), Irqs, config);
+
+    defmt::info!("Generate 10 u32");
+    for _ in 0..10 {
+        let rand = trng.async_next_u32().await.unwrap();
+        defmt::info!("{}", rand);
+    }
+
+    defmt::info!("Generate 10 u64");
+    for _ in 0..10 {
+        let rand = trng.async_next_u64().await.unwrap();
+        defmt::info!("{}", rand);
+    }
+
+    let mut buf = [0_u8; 256];
+
+    defmt::info!("Generate 10 256-byte buffers");
+    for _ in 0..10 {
+        trng.async_fill_bytes(&mut buf).await.unwrap();
+        defmt::info!("{:02x}", buf);
+    }
+
+    defmt::info!("RngCore");
+
+    for _ in 0..10 {
+        defmt::info!("u32: {}", trng.next_u32());
+        defmt::info!("u64: {}", trng.next_u64());
+    }
+}
-- 
cgit