From 2bc49763c6c36026feeaf681078d06106b73e0b0 Mon Sep 17 00:00:00 2001 From: Ugljesa Jovanovic Date: Sat, 14 Sep 2024 14:57:10 +0200 Subject: TRNG support for 235x --- examples/rp23/src/bin/trng.rs | 64 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 examples/rp23/src/bin/trng.rs (limited to 'examples') diff --git a/examples/rp23/src/bin/trng.rs b/examples/rp23/src/bin/trng.rs new file mode 100644 index 000000000..e146baa2e --- /dev/null +++ b/examples/rp23/src/bin/trng.rs @@ -0,0 +1,64 @@ +//! This example shows TRNG usage + +#![no_std] +#![no_main] + +use defmt::*; +use embassy_executor::Spawner; +use embassy_rp::bind_interrupts; +use embassy_rp::block::ImageDef; +use embassy_rp::gpio::{Level, Output}; +use embassy_rp::peripherals::TRNG; +use embassy_rp::trng::Trng; +use embassy_time::Timer; +use rand::RngCore; +use {defmt_rtt as _, panic_probe as _}; + +#[link_section = ".start_block"] +#[used] +pub static IMAGE_DEF: ImageDef = ImageDef::secure_exe(); + +// Program metadata for `picotool info` +#[link_section = ".bi_entries"] +#[used] +pub static PICOTOOL_ENTRIES: [embassy_rp::binary_info::EntryAddr; 4] = [ + embassy_rp::binary_info::rp_program_name!(c"example"), + embassy_rp::binary_info::rp_cargo_version!(), + embassy_rp::binary_info::rp_program_description!(c"Blinky"), + embassy_rp::binary_info::rp_program_build_attribute!(), +]; + +bind_interrupts!(struct Irqs { + TRNG_IRQ => embassy_rp::trng::InterruptHandler; +}); + +#[embassy_executor::main] +async fn main(_spawner: Spawner) { + let peripherals = embassy_rp::init(Default::default()); + + // Initialize the TRNG with default configuration + let mut trng = Trng::new(peripherals.TRNG, Irqs, embassy_rp::trng::Config::default()); + // A buffer to collect random bytes in. + let mut randomness = [0u8; 58]; + + let mut led = Output::new(peripherals.PIN_25, Level::Low); + + loop { + trng.fill_bytes(&mut randomness).await; + info!("Random bytes async {}", &randomness); + trng.blocking_fill_bytes(&mut randomness); + info!("Random bytes blocking {}", &randomness); + let random_u32 = trng.next_u32(); + let random_u64 = trng.next_u64(); + info!("Random u32 {} u64 {}", random_u32, random_u64); + // Random number of blinks between 0 and 31 + let blinks = random_u32 % 32; + for _ in 0..blinks { + led.set_high(); + Timer::after_millis(20).await; + led.set_low(); + Timer::after_millis(20).await; + } + Timer::after_millis(1000).await; + } +} -- cgit