Talk as presented plus example source for MSP432 blinky light demo

example-source/msp432-hal/.gitignore

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+/target
+**/*.rs.bk
+Cargo.lock

example-source/msp432-hal/Cargo.toml

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+[package]
+name = "msp432-hal"
+version = "0.1.0"
+authors = ["Levi Pearson <levipearson@gmail.com>"]
+categories = ["embedded", "hardware-support", "no-std"]
+description = "HAL for the TI MSP432 family of microcontrollers"
+keywords = ["arm", "cortex-m", "msp432", "hal"]
+edition = "2018"
+
+[dependencies]
+cortex-m = "0.5"
+embedded-hal = "0.2"
+nb = "0.1"
+msp432p401r = { path = "../msp432p401r" }
+void = { version = "1.0", default-features = false }
+cast = { version = "0.2", default-features = false }
+
+[features]
+rt = ["msp432p401r/rt"]

example-source/msp432-hal/src/cs.rs

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+//! Clock System
+
+use core::cmp;
+use pac::{cs, CS};
+
+use crate::time::Hertz;
+
+
+/// Extension trait that constrains the `CS` peripheral
+pub trait CsExt {
+    /// Constrains the `CS` peripheral so that it plays nicely with other abstractions
+    fn constrain(self) -> Cs;
+}
+
+impl CsExt for CS {
+    fn constrain(self) -> Cs {
+        Cs {
+
+        }
+    }
+}
+
+/*
++--------+-----------------------+---------------+-------------------------------------+
+| Clock  | Default Clock Source  | Default Clock | Description                         |
+|        |                       | Frequency     |                                     |
++========+=======================+===============+=====================================+
+| MCLK   | DCO                   | 3 MHz         | Master Clock - Sources CPU and      |
+|        |                       |               | peripherals                         |
++--------+-----------------------+---------------+-------------------------------------+
+| HSMCLK | DCO                   | 3 MHz         | Subsystem Master Clock - Sources    |
+|        |                       |               | peripherals                         |
++--------+-----------------------+---------------+-------------------------------------+
+| SMCLK  | DCO                   | 3 MHz         | Low-speed subsystem master clock -  |
+|        |                       |               | Sources peripherals                 |
++--------+-----------------------+---------------+-------------------------------------+
+| ACLK   | LFXT (or REFO if no   | 32.768 kHz    | Auxiliary clock - Sources           |
+|        | crystal present)      |               | peripherals                         |
++--------+-----------------------+---------------+-------------------------------------+
+| BCLK   | LFXT (or REFO if no   | 32.768 kHz    | Low-speed backup domain clock -     |
+|        | crystal present)      |               | Sources LPM peripherals             |
++--------+-----------------------+---------------+-------------------------------------+
+*/
+
+pub struct Cs {
+
+}
+
+/// Frozen clock frequencies
+///
+/// This value holds the current clocks frequencies and indicates that they can
+/// no longer be changed
+#[derive(Clone, Copy)]
+pub struct Clocks {
+    sysclk: Hertz,
+}
+
+impl Clocks {
+    /// Returns the system (core) frequency
+    pub fn sysclk(&self) -> Hertz {
+        self.sysclk
+    }
+}

example-source/msp432-hal/src/delay.rs

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+//! Delays
+
+use cast::u32;
+use cortex_m::peripheral::syst::SystClkSource;
+use cortex_m::peripheral::SYST;
+
+use hal::blocking::delay::{DelayMs, DelayUs};
+use crate::cs::Clocks;
+
+/// System timer (SysTick) as a delay provider
+pub struct Delay {
+    clocks: Clocks,
+    syst: SYST,
+}
+
+impl Delay {
+    /// Configure the system timer (SysTick) as a delay provider
+    pub fn new(mut syst: SYST, clocks: Clocks) -> Self {
+        syst.set_clock_source(SystClkSource::Core);
+
+        Delay { syst, clocks }
+    }
+
+    /// Release the system timer (SysTick) resource
+    pub fn free(self) -> SYST {
+        self.syst
+    }
+}
+
+impl DelayMs<u32> for Delay {
+    fn delay_ms(&mut self, ms: u32) {
+        self.delay_us(ms * 1_000);
+    }
+}
+
+impl DelayMs<u16> for Delay {
+    fn delay_ms(&mut self, ms: u16) {
+        self.delay_ms(u32(ms));
+    }
+}
+
+impl DelayMs<u8> for Delay {
+    fn delay_ms(&mut self, ms: u8) {
+        self.delay_ms(u32(ms));
+    }
+}
+
+impl DelayUs<u32> for Delay {
+    fn delay_us(&mut self, us: u32) {
+        let rvr = us * (self.clocks.sysclk().0 / 1_000_000);
+
+        assert!(rvr < (1 << 24));
+
+        self.syst.set_reload(rvr);
+        self.syst.clear_current();
+        self.syst.enable_counter();
+
+        while !self.syst.has_wrapped() {}
+
+        self.syst.disable_counter();
+    }
+}
+
+impl DelayUs<u16> for Delay {
+    fn delay_us(&mut self, us: u16) {
+        self.delay_us(u32(us));
+    }
+}
+
+impl DelayUs<u8> for Delay {
+    fn delay_us(&mut self, us: u8) {
+        self.delay_us(u32(us));
+    }
+}

example-source/msp432-hal/src/gpio.rs

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+//! General Purpose Input / Output
+
+use pac::DIO;
+use core::marker::PhantomData;
+use hal::digital::OutputPin;
+
+pub trait GpioExt {
+    type Parts;
+
+    /// Consume and split the device into its constituent parts
+    fn split(self) -> Self::Parts;
+}
+
+/// Represents a pin configured for input.
+pub struct Input<MODE> {
+    _mode: PhantomData<MODE>,
+}
+
+/// Represents a pin configured for output.
+pub struct Output<MODE> {
+    _mode: PhantomData<MODE>,
+}

example-source/msp432-hal/src/lib.rs

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+//! HAL for the MSP432 family of microcontrollers
+//!
+//! This is an implementation of the [`embedded-hal`] traits for the MSP432 family of
+//! microcontrollers.
+//!
+//! [`embedded-hal`]: https://github.com/japaric/embedded-hal
+//!
+//! # Usage
+//!
+//! To build applications (binary crates) using this crate follow the [cortex-m-quickstart]
+//! instructions and add this crate as a dependency in step number 5 and make sure you enable the
+//! "rt" Cargo feature of this crate.
+//!
+//! [cortex-m-quickstart]: https://docs.rs/cortex-m-quickstart/~0.3
+
+#![warn(missing_docs)]
+#![no_std]
+
+extern crate embedded_hal as hal;
+extern crate msp432p401r as pac;
+
+pub mod prelude;
+pub mod gpio;
+pub mod delay;
+pub mod cs;
+pub mod time;

example-source/msp432-hal/src/prelude.rs

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+//! Prelude
+
+pub use hal::prelude::*;

example-source/msp432-hal/src/time.rs

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+//! Time units
+
+use cortex_m::peripheral::DWT;
+use crate::cs::Clocks;
+
+/// Bits per seconds
+#[derive(Clone, Copy)]
+pub struct Bps(pub u32);
+
+/// Hertz
+#[derive(Clone, Copy)]
+pub struct Hertz(pub u32);
+
+/// KiloHertz
+#[derive(Clone, Copy)]
+pub struct KiloHertz(pub u32);
+
+/// MegaHertz
+#[derive(Clone, Copy)]
+pub struct MegaHertz(pub u32);
+
+
+/// Extension trait to add convenience methods to `u32`
+pub trait U32Ext {
+    /// Wrap in `Bps`
+    fn bps(self) -> Bps;
+
+    /// Wrap in `Hertz`
+    fn hz(self) -> Hertz;
+
+    /// Wrap in `KiloHertz`
+    fn khz(self) -> KiloHertz;
+
+    /// Wrap in `MegaHertz`
+    fn mhz(self) -> MegaHertz;
+}
+
+impl U32Ext for u32 {
+    fn bps(self) -> Bps {
+        Bps(self)
+    }
+
+    fn hz(self) -> Hertz {
+        Hertz(self)
+    }
+
+    fn khz(self) -> KiloHertz {
+        KiloHertz(self)
+    }
+
+    fn mhz(self) -> MegaHertz {
+        MegaHertz(self)
+    }
+}
+
+impl Into<Hertz> for KiloHertz {
+    fn into(self) -> Hertz {
+        Hertz(self.0 * 1_000)
+    }
+}
+
+impl Into<Hertz> for MegaHertz {
+    fn into(self) -> Hertz {
+        Hertz(self.0 * 1_000_000)
+    }
+}
+
+impl Into<KiloHertz> for MegaHertz {
+    fn into(self) -> KiloHertz {
+        KiloHertz(self.0 * 1_000)
+    }
+}
+
+/// A monotonic nondecreasing timer
+#[derive(Clone, Copy)]
+pub struct MonoTimer {
+    frequency: Hertz,
+}
+
+impl MonoTimer {
+    /// Create a new monotonic timer
+    pub fn new(mut dwt: DWT, clocks: Clocks) -> Self {
+        dwt.enable_cycle_counter();
+
+        // can't stop or reset CYCCNT
+        drop(dwt);
+
+        MonoTimer {
+            frequency: clocks.sysclk(),
+        }
+    }
+
+    /// Return the frequency at which the timer is operating
+    pub fn frequency(&self) -> Hertz {
+        self.frequency
+    }
+
+    /// Returns an `Instant` corresponding to "now"
+    pub fn now(&self) -> Instant {
+        Instant {
+            now: DWT::get_cycle_count(),
+        }
+    }
+}
+
+/// A measurement from a monotonically nondecreasing clock
+#[derive(Clone, Copy)]
+pub struct Instant {
+    now: u32,
+}
+
+impl Instant {
+    /// Ticks elapsed since the `Instant` was created
+    pub fn elapsed(&self) -> u32 {
+        DWT::get_cycle_count().wrapping_sub(self.now)
+    }
+}