Add RNG driver

Cargo.toml

@@ -14,7 +14,7 @@ license = "MIT/Apache-2.0"
 
 [dependencies]
 # hpm-metapac = { path = "../hpm-data/build/hpm-metapac" }
-hpm-metapac = { version = "0.0.4", git = "https://github.com/hpmicro-rs/hpm-metapac.git", tag = "hpm-data-7b07750284fa2b5b3f6b09c72e70ea6dd4d2231d" }
+hpm-metapac = { version = "0.0.5", git = "https://github.com/hpmicro-rs/hpm-metapac.git", tag = "hpm-data-71a17c4971e813a2c7151de990cbe05fe9a19a70" }
 
 riscv = { version = "0.11", features = ["critical-section-single-hart"] }
 riscv-rt = { version = "0.12.2", optional = true }
@@ -43,16 +43,17 @@ embedded-hal-async = "1.0.0"
 chrono = { version = "0.4.38", default-features = false, optional = true }
 mcan = { version = "0.5.0", optional = true }
 embedded-storage = "0.3.1"
+rand_core = "0.6.4"
 
 [build-dependencies]
 # hpm-metapac = { path = "../hpm-data/build/hpm-metapac", default-features = false, features = [
 #     "metadata",
 # ] }
-hpm-metapac = { version = "0.0.4", git = "https://github.com/hpmicro-rs/hpm-metapac.git", tag = "hpm-data-7b07750284fa2b5b3f6b09c72e70ea6dd4d2231d", default-features = false, features = [
+hpm-metapac = { git = "https://github.com/hpmicro-rs/hpm-metapac.git", tag = "hpm-data-71a17c4971e813a2c7151de990cbe05fe9a19a70", default-features = false, features = [
     "metadata",
 ] }
-proc-macro2 = "1.0.85"
-quote = "1.0.15"
+proc-macro2 = "1.0.86"
+quote = "1.0.37"
 
 [features]
 default = ["rt", "embassy", "defmt", "time"]

examples/hpm6300evk/Cargo.toml

@@ -4,11 +4,11 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-# hpm-metapac = { version = "0.0.4", features = [
+# hpm-metapac = { features = [
 #     "hpm6360",
 #     "memory-x",
 #     "rt",
-# ], git = "https://github.com/hpmicro-rs/hpm-metapac.git", tag = "hpm-data-7b07750284fa2b5b3f6b09c72e70ea6dd4d2231d" }
+# ], git = "https://github.com/hpmicro-rs/hpm-metapac.git", tag = "hpm-data-71a17c4971e813a2c7151de990cbe05fe9a19a70" }
 hpm-hal = { path = "../..", features = ["rt", "embassy", "hpm6360"] }
 defmt = "0.3.8"
 defmt-rtt = "0.4.1"

examples/hpm6750evkmini/Cargo.toml

@@ -7,11 +7,11 @@ edition = "2021"
 defmt = "0.3.8"
 defmt-rtt = "0.4.1"
 embedded-hal = "1.0.0"
-#hpm-metapac = { version = "0.0.4", features = [
+# hpm-metapac = { features = [
 #    "hpm6750",
 #    "memory-x",
 #    "rt",
-#], git = "https://github.com/hpmicro-rs/hpm-metapac.git", tag = "hpm-data-7b07750284fa2b5b3f6b09c72e70ea6dd4d2231d" }
+#], git = "https://github.com/hpmicro-rs/hpm-metapac.git", tag = "hpm-data-71a17c4971e813a2c7151de990cbe05fe9a19a70" }
 
 hpm-hal = { path = "../..", features = ["rt", "embassy", "hpm6750", "chrono"] }
 

src/lib.rs

@@ -69,6 +69,8 @@ pub mod dac;
 // motor control peripherals
 #[cfg(qei)]
 pub mod qei;
+#[cfg(rng)]
+pub mod rng;
 #[cfg(trgm)]
 pub mod trgm;
 

src/rng.rs

@@ -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};
+
+use crate::pac;
+
+/// 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,
+}
+
+#[allow(unused)]
+pub struct Rng<'d, T: Instance> {
+    _peri: PeripheralRef<'d, T>,
+}
+
+impl<'d, T: Instance> Rng<'d, T> {
+    pub fn new(peri: impl Peripheral<P = T> + 'd) -> Result<Rng<'d, T>, Error> {
+        into_ref!(peri);
+
+        T::add_resource_group(0);
+
+        let mut this = Rng { _peri: peri };
+        this.init()?;
+
+        Ok(this)
+    }
+
+    fn init(&mut self) -> Result<(), Error> {
+        let r = T::regs();
+
+        // disable interrupts. RNG interrupt is useless.
+        r.ctrl().modify(|w| {
+            w.set_mirqdn(true);
+            w.set_mirqerr(true);
+            w.set_fufmod(0b00);
+        });
+
+        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
+
+        Ok(())
+    }
+
+    pub fn reset(&mut self) -> Result<(), Error> {
+        T::regs().cmd().modify(|w| w.set_sftrst(true));
+        self.init()?;
+
+        Ok(())
+    }
+
+    /// Run self-test
+    pub fn run_selftest(&mut self) -> Result<(), Error> {
+        let r = T::regs();
+        r.cmd().modify(|w| w.set_slfchk(true));
+
+        loop {
+            let status = r.sta().read();
+
+            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
+        }
+
+        Ok(())
+    }
+}
+
+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
+    }
+
+    fn next_u64(&mut self) -> u64 {
+        let mut rand = self.next_u32() as u64;
+        rand |= (self.next_u32() as u64) << 32;
+        rand
+    }
+
+    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
+            }
+        }
+    }
+
+    fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), rand_core::Error> {
+        self.fill_bytes(dest);
+        Ok(())
+    }
+}
+
+impl<'d, T: Instance> CryptoRng for Rng<'d, T> {}
+
+pub(crate) trait SealedInstance {
+    fn regs() -> pac::rng::Rng;
+}
+
+#[allow(private_bounds)]
+pub trait Instance: SealedInstance + crate::sysctl::ClockPeripheral + 'static {
+    // /// Interrupt for this RNG instance.
+    // type Interrupt: interrupt::typelevel::Interrupt;
+}
+
+foreach_peripheral!(
+    (rng, $inst:ident) => {
+        impl SealedInstance for crate::peripherals::$inst {
+            fn regs() -> pac::rng::Rng {
+                 pac::$inst
+            }
+        }
+
+        impl Instance for crate::peripherals::$inst {
+            // type Interrupt = crate::interrupt::typelevel::$inst;
+        }
+    };
+);