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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| //! RNG, Random Number Generator | ||
| //! | ||
| //! RNG interrupt support: | ||
| //! - seed generated, self-test done | ||
| //! - error occurred | ||
| //! - FIFO underflow | ||
| //! | ||
| use embassy_hal_internal::{into_ref, Peripheral, PeripheralRef}; | ||
| use rand_core::{CryptoRng, RngCore}; | ||
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| use crate::pac; | ||
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| /// RNG error | ||
| #[derive(Debug, PartialEq, Eq, Clone, Copy)] | ||
| #[cfg_attr(feature = "defmt", derive(defmt::Format))] | ||
| pub enum Error { | ||
| /// Function error. | ||
| FuncError, | ||
| /// Self-test error. | ||
| SelfTestError, | ||
| } | ||
|
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| #[allow(unused)] | ||
| pub struct Rng<'d, T: Instance> { | ||
| _peri: PeripheralRef<'d, T>, | ||
| } | ||
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| impl<'d, T: Instance> Rng<'d, T> { | ||
| pub fn new(peri: impl Peripheral<P = T> + 'd) -> Result<Rng<'d, T>, Error> { | ||
| into_ref!(peri); | ||
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| T::add_resource_group(0); | ||
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| let mut this = Rng { _peri: peri }; | ||
| this.init()?; | ||
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| Ok(this) | ||
| } | ||
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| fn init(&mut self) -> Result<(), Error> { | ||
| let r = T::regs(); | ||
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| // disable interrupts. RNG interrupt is useless. | ||
| r.ctrl().modify(|w| { | ||
| w.set_mirqdn(true); | ||
| w.set_mirqerr(true); | ||
| w.set_fufmod(0b00); | ||
| }); | ||
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| r.cmd().modify(|w| w.set_clrerr(true)); // clear all error and interrupt flags | ||
| r.cmd().modify(|w| w.set_gensd(true)); // generate seed | ||
| while !r.sta().read().fsddn() { | ||
| if r.sta().read().funcerr() { | ||
| return Err(Error::FuncError); | ||
| } | ||
| } | ||
| r.ctrl().modify(|w| w.set_autrsd(true)); // auto reseed | ||
|
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| Ok(()) | ||
| } | ||
|
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| pub fn reset(&mut self) -> Result<(), Error> { | ||
| T::regs().cmd().modify(|w| w.set_sftrst(true)); | ||
| self.init()?; | ||
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| Ok(()) | ||
| } | ||
|
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| /// Run self-test | ||
| pub fn run_selftest(&mut self) -> Result<(), Error> { | ||
| let r = T::regs(); | ||
| r.cmd().modify(|w| w.set_slfchk(true)); | ||
|
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| loop { | ||
| let status = r.sta().read(); | ||
|
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| if status.funcerr() { | ||
| return Err(Error::FuncError); | ||
| } else if status.scdn() { | ||
| // self-test done | ||
| if status.scpf() != 0 { | ||
| return Err(Error::SelfTestError); | ||
| } else { | ||
| break; | ||
| } | ||
| } | ||
| // loop until self-test done | ||
| } | ||
|
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| Ok(()) | ||
| } | ||
| } | ||
|
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| impl<'d, T: Instance> RngCore for Rng<'d, T> { | ||
| fn next_u32(&mut self) -> u32 { | ||
| while T::regs().sta().read().busy() {} | ||
| T::regs().fo2b().read().0 | ||
| } | ||
|
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| fn next_u64(&mut self) -> u64 { | ||
| let mut rand = self.next_u32() as u64; | ||
| rand |= (self.next_u32() as u64) << 32; | ||
| rand | ||
| } | ||
|
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| fn fill_bytes(&mut self, dest: &mut [u8]) { | ||
| for chunk in dest.chunks_mut(4) { | ||
| let rand = self.next_u32(); | ||
| for (slot, num) in chunk.iter_mut().zip(rand.to_ne_bytes().iter()) { | ||
| *slot = *num | ||
| } | ||
| } | ||
| } | ||
|
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| fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), rand_core::Error> { | ||
| self.fill_bytes(dest); | ||
| Ok(()) | ||
| } | ||
| } | ||
|
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| impl<'d, T: Instance> CryptoRng for Rng<'d, T> {} | ||
|
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| pub(crate) trait SealedInstance { | ||
| fn regs() -> pac::rng::Rng; | ||
| } | ||
|
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| #[allow(private_bounds)] | ||
| pub trait Instance: SealedInstance + crate::sysctl::ClockPeripheral + 'static { | ||
| // /// Interrupt for this RNG instance. | ||
| // type Interrupt: interrupt::typelevel::Interrupt; | ||
| } | ||
|
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| foreach_peripheral!( | ||
| (rng, $inst:ident) => { | ||
| impl SealedInstance for crate::peripherals::$inst { | ||
| fn regs() -> pac::rng::Rng { | ||
| pac::$inst | ||
| } | ||
| } | ||
|
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| impl Instance for crate::peripherals::$inst { | ||
| // type Interrupt = crate::interrupt::typelevel::$inst; | ||
| } | ||
| }; | ||
| ); |