2021-05-06 01:59:16 +00:00
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#![macro_use]
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2021-05-06 18:33:29 +00:00
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//use crate::pac::rng::{regs, Rng};
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use crate::pac;
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2021-04-26 18:11:46 +00:00
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use crate::peripherals;
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2021-05-06 18:33:29 +00:00
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use crate::interrupt;
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2021-05-06 18:58:41 +00:00
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use futures::future::poll_fn;
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2021-05-06 18:33:29 +00:00
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use embassy::util::{Unborrow, AtomicWaker};
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2021-04-26 18:11:46 +00:00
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use embassy_extras::unborrow;
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2021-05-06 18:33:29 +00:00
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use rand_core::{RngCore, CryptoRng};
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use defmt::*;
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static RNG_WAKER: AtomicWaker = AtomicWaker::new();
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#[interrupt]
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unsafe fn RNG() {
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let bits = crate::pac::RNG.sr().read();
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if bits.drdy() || bits.seis() || bits.ceis() {
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crate::pac::RNG.cr().write(|reg| reg.set_ie(false));
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RNG_WAKER.wake();
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}
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}
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2021-04-26 18:11:46 +00:00
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pub struct Random<T: Instance> {
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inner: T,
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}
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impl<T: Instance> Random<T> {
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2021-05-06 18:33:29 +00:00
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pub fn new(inner: impl Unborrow<Target=T>) -> Self {
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2021-04-26 18:11:46 +00:00
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unborrow!(inner);
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2021-05-06 01:43:46 +00:00
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Self { inner }
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2021-04-26 18:11:46 +00:00
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}
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}
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2021-05-06 18:33:29 +00:00
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impl<T: Instance> RngCore for Random<T> {
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fn next_u32(&mut self) -> u32 {
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loop {
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let bits = unsafe { T::regs().sr().read() };
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if bits.drdy() {
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return unsafe{ T::regs().dr().read() }
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}
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}
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}
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fn next_u64(&mut self) -> u64 {
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let mut rand = self.next_u32() as u64;
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rand |= (self.next_u32() as u64) << 32;
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rand
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}
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fn fill_bytes(&mut self, dest: &mut [u8]) {
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for chunk in dest.chunks_mut(4) {
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let rand = self.next_u32();
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for (slot, num) in chunk.iter_mut().zip(rand.to_be_bytes().iter()) {
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*slot = *num
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}
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}
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}
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fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), rand_core::Error> {
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self.fill_bytes( dest );
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Ok(())
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}
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}
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impl<T: Instance> CryptoRng for Random<T> { }
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2021-04-26 18:11:46 +00:00
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use core::future::Future;
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use core::marker::PhantomData;
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2021-05-06 18:33:29 +00:00
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use embassy::traits;
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use core::task::{Poll, Context};
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use core::pin::Pin;
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pub enum Error {
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SeedError,
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ClockError,
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}
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impl<T: Instance> traits::rng::Rng for Random<T> {
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type Error = Error;
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type RngFuture<'a> where Self: 'a = impl Future<Output=Result<(), Self::Error>>;
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fn fill_bytes<'a>(&'a mut self, dest: &'a mut [u8]) -> Self::RngFuture<'a> {
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unsafe {
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T::regs().cr().modify(|reg| {
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reg.set_rngen(true);
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});
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}
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async move {
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for chunk in dest.chunks_mut(4) {
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2021-05-06 18:58:41 +00:00
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poll_fn(|cx| {
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RNG_WAKER.register(cx.waker());
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unsafe {
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T::regs().cr().modify(|reg| {
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reg.set_ie(true);
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});
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}
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let bits = unsafe { T::regs().sr().read() };
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if bits.drdy() {
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Poll::Ready(Ok(()))
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} else if bits.seis() {
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unsafe {
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T::regs().sr().modify(|reg| {
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reg.set_seis(false);
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});
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}
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Poll::Ready(Err(Error::SeedError))
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} else if bits.ceis() {
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unsafe {
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T::regs().sr().modify(|reg| {
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reg.set_ceis(false);
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});
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}
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Poll::Ready(Err(Error::ClockError))
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} else {
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Poll::Pending
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}
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} ).await?;
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2021-05-06 18:33:29 +00:00
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let random_bytes = unsafe { T::regs().dr().read() }.to_be_bytes();
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for (dest, src) in chunk.iter_mut().zip(random_bytes.iter()) {
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*dest = *src
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}
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}
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Ok(())
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}
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2021-04-26 18:11:46 +00:00
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}
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}
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pub(crate) mod sealed {
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use super::*;
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pub trait Instance {
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2021-05-06 18:33:29 +00:00
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fn regs() -> pac::rng::Rng;
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2021-04-26 18:11:46 +00:00
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}
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}
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pub trait Instance: sealed::Instance {}
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macro_rules! impl_rng {
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2021-05-06 18:58:41 +00:00
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() => {
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2021-05-06 18:33:29 +00:00
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impl crate::rng::sealed::Instance for peripherals::RNG {
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fn regs() -> crate::pac::chip::rng::Rng {
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crate::pac::RNG
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2021-04-26 18:11:46 +00:00
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}
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}
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2021-05-06 18:33:29 +00:00
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impl crate::rng::Instance for peripherals::RNG {}
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2021-05-06 01:43:46 +00:00
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};
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}
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