stm32/rng: add test.

tests/stm32/src/bin/rng.rs

@@ -0,0 +1,50 @@
+// required-features: rng
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../common.rs"]
+mod common;
+use common::*;
+use embassy_executor::Spawner;
+use embassy_stm32::rng::Rng;
+use embassy_stm32::{bind_interrupts, peripherals, rng};
+use {defmt_rtt as _, panic_probe as _};
+
+#[cfg(any(feature = "stm32l4a6zg", feature = "stm32h755zi", feature = "stm32f429zi"))]
+bind_interrupts!(struct Irqs {
+   HASH_RNG => rng::InterruptHandler<peripherals::RNG>;
+});
+#[cfg(any(feature = "stm32l073rz"))]
+bind_interrupts!(struct Irqs {
+   RNG_LPUART1 => rng::InterruptHandler<peripherals::RNG>;
+});
+#[cfg(not(any(
+    feature = "stm32l4a6zg",
+    feature = "stm32l073rz",
+    feature = "stm32h755zi",
+    feature = "stm32f429zi"
+)))]
+bind_interrupts!(struct Irqs {
+   RNG => rng::InterruptHandler<peripherals::RNG>;
+});
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p: embassy_stm32::Peripherals = embassy_stm32::init(config());
+
+    let mut rng = Rng::new(p.RNG, Irqs);
+
+    let mut buf1 = [0u8; 16];
+    unwrap!(rng.async_fill_bytes(&mut buf1).await);
+    info!("random bytes: {:02x}", buf1);
+
+    let mut buf2 = [0u8; 16];
+    unwrap!(rng.async_fill_bytes(&mut buf2).await);
+    info!("random bytes: {:02x}", buf2);
+
+    defmt::assert!(buf1 != buf2);
+
+    info!("Test OK");
+    cortex_m::asm::bkpt();
+}