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index b6cdff0..0000000
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-"checksum volatile-register 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0d67cb4616d99b940db1d6bd28844ff97108b498a6ca850e5b6191a532063286"
diff --git a/app/Cargo.toml b/app/Cargo.toml
deleted file mode 100644
index 1bf5ab8..0000000
--- a/app/Cargo.toml
+++ /dev/null
@@ -1,27 +0,0 @@
-[package]
-name = "samd21-demo"
-version = "0.1.0"
-authors = ["Brian Cully <bjc@kublai.com>"]
-edition = "2018"
-readme = "../README.md"
-license = "GPL-3.0-or-later"
-
-[dependencies]
-rb = { path = "../rb" }
-usbh = { path = "../usbh" }
-
-trinket_m0 = { path = "../../atsamd/boards/trinket_m0" }
-clint = { path = "../../clint" }
-
-panic-halt = "~0.2"
-smart-leds = "~0.2"
-smart-leds-trait = "~0.2"
-apa102-spi = "~0.2" # DotStar driver.
-nb = "~0.1"
-cortex-m = "~0.6"
-cortex-m-rt = "~0.6"
-embedded-hal = "~0.2"
-log = { version = "~0.4", features = ["max_level_trace", "release_max_level_warn"] }
-
-[features]
-default = ["cortex-m/const-fn"]
diff --git a/app/Makefile b/app/Makefile
deleted file mode 100644
index a5ef39f..0000000
--- a/app/Makefile
+++ /dev/null
@@ -1,38 +0,0 @@
-APP = samd21-demo
-
-USBVID = 239a
-USBPID = '001e|801e'
-
-BOSSAC = bossac
-SERIAL = $(shell ./find-serial-port $(USBVID) $(USBPID) || echo 'cant-find-serial-port')
-OFFSET = 0x2000
-
-.PHONY: all clean cargo-build
-
-all: $(APP).uf2
-
-clean:
-	rm -f $(APP).uf2
-	rm -f $(APP).bin
-	cargo clean
-
-cargo-build:
-	cargo build
-
-target/thumbv6m-none-eabi/debug/$(APP): cargo-build
-
-$(APP).bin: target/thumbv6m-none-eabi/debug/$(APP)
-	cargo objcopy --bin $(APP) -- -O binary $(APP).bin
-
-# Requires https://github.com/sajattack/uf2conv-rs.git
-%.uf2: %.bin
-	uf2conv-rs $< --base $(OFFSET) --output $@
-
-flash: $(APP).bin $(SERIAL)
-	$(BOSSAC) -R -e -w -v -o$(OFFSET) -p$(SERIAL) $<
-
-qemu: target/thumbv6m-none-eabi/debug/$(APP)
-	qemu-system-arm -d in_asm,int,exec,cpu,guest_errors,unimp -pidfile qemu.pid -cpu cortex-m0 -machine lm3s6965evb -nographic -semihosting-config enable=on,target=native -s -S -kernel $<
-
-gdb: target/thumbv6m-none-eabi/debug/$(APP)
-	gdb-multiarch -ex "target remote localhost:1234" -ex "break main" -ex "continue" $<
diff --git a/app/find-serial-port b/app/find-serial-port
deleted file mode 100755
index 62e2c0c..0000000
--- a/app/find-serial-port
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/sh
-
-if [ $# -ne 2 ]; then
-    echo "Usage: $0 vid pid" >&2
-    exit 1
-fi
-
-prefix=/dev/serial/by-id
-
-for dev in `ls $prefix`; do
-    if [ `udevadm info -q property --name $prefix/$dev | egrep -i "ID_VENDOR_ID=($1)|ID_MODEL_ID=($2)" | wc -l` -eq 2 ]; then
-        echo `readlink -f $prefix/$dev`
-        exit 0
-    fi
-done
-exit 2
diff --git a/app/logitech-kb-start.pcapng b/app/logitech-kb-start.pcapng
deleted file mode 100644
index ab22fd0..0000000
--- a/app/logitech-kb-start.pcapng
+++ /dev/null
diff --git a/app/src/dotstar.rs b/app/src/dotstar.rs
deleted file mode 100644
index 8e930d0..0000000
--- a/app/src/dotstar.rs
+++ /dev/null
@@ -1,42 +0,0 @@
-use trinket_m0::{
-    clock::GenericClockController,
-    gpio::{self, Floating, Input},
-    prelude::*,
-    sercom::{self, PadPin, SPIMaster1},
-    PM, SERCOM1,
-};
-
-use apa102_spi::Apa102;
-
-pub fn new(
-    sercom: SERCOM1,
-    miso: gpio::Pa31<Input<Floating>>,
-    mosi: gpio::Pa0<Input<Floating>>,
-    sck: gpio::Pa1<Input<Floating>>,
-    port: &mut gpio::Port,
-    pm: &mut PM,
-    clocks: &mut GenericClockController,
-) -> Apa102<
-    SPIMaster1<
-        sercom::Sercom1Pad3<gpio::Pa31<gpio::PfD>>,
-        sercom::Sercom1Pad0<gpio::Pa0<gpio::PfD>>,
-        sercom::Sercom1Pad1<gpio::Pa1<gpio::PfD>>,
-    >,
-> {
-    let gclk = clocks.gclk0();
-    let miso = miso.into_pad(port);
-    let mosi = mosi.into_pad(port);
-    let sck = sck.into_pad(port);
-    let spi = SPIMaster1::new(
-        &clocks
-            .sercom1_core(&gclk)
-            .expect("setting up sercom1 clock"),
-        3.mhz(),
-        apa102_spi::MODE,
-        sercom,
-        pm,
-        (miso, mosi, sck),
-    );
-
-    Apa102::new(spi)
-}
diff --git a/app/src/logger.rs b/app/src/logger.rs
deleted file mode 100644
index 9f9452e..0000000
--- a/app/src/logger.rs
+++ /dev/null
@@ -1,139 +0,0 @@
-use crate::rtc;
-use rb::{Reader, RingBuffer, Writer};
-
-use core::cell::UnsafeCell;
-use core::fmt::{self, Write};
-use embedded_hal::{digital::v2::OutputPin, serial};
-use log::{Metadata, Record};
-use trinket_m0::{
-    gpio::{Pa6, Pa7, PfD},
-    sercom::{Sercom0Pad2, Sercom0Pad3, UART0},
-};
-
-static mut UART0: usize = 0;
-
-struct JoinedRingBuffer<'a> {
-    lbr: Reader<'a, u8>,
-    lbw: Writer<'a, u8>,
-}
-
-impl<'a> JoinedRingBuffer<'a> {
-    const fn new(rb: &'a RingBuffer<u8>) -> Self {
-        let (lbr, lbw) = rb.split();
-        Self { lbr: lbr, lbw: lbw }
-    }
-}
-
-impl fmt::Write for JoinedRingBuffer<'_> {
-    fn write_str(&mut self, s: &str) -> Result<(), fmt::Error> {
-        for b in s.bytes() {
-            if let Err(_) = self.lbw.unshift(b) {
-                // Ignore buffer full errors for logging.
-                return Ok(());
-            }
-        }
-        Ok(())
-    }
-}
-
-static mut LB: RingBuffer<u8> = RingBuffer::<u8>::new(0);
-static mut JRB: JoinedRingBuffer = unsafe { JoinedRingBuffer::new(&LB) };
-
-// The UART isn't necessarily Sync, so wrap it in something that
-// is. As long as flush() is only called from one thread, we're fine,
-// but this is a guarantee that the logger module doesn't make.
-pub struct WriteWrapper<W> {
-    w: W,
-}
-impl<W> WriteWrapper<W>
-where
-    W: serial::Write<u8>,
-{
-    pub const fn new(writer: W) -> Self {
-        Self { w: writer }
-    }
-}
-unsafe impl<W> Sync for WriteWrapper<W> {}
-
-pub struct SerialLogger<W, L> {
-    writer: UnsafeCell<WriteWrapper<W>>,
-    led: UnsafeCell<L>,
-}
-
-impl<W, L> SerialLogger<W, L>
-where
-    W: serial::Write<u8>,
-    L: OutputPin + Send + Sync,
-{
-    pub fn new(writer: WriteWrapper<W>, led: L) -> Self {
-        // Stash this for unsafe usage in case there's an issue with
-        // the rest of the logging.
-        unsafe { UART0 = core::mem::transmute(&writer.w) };
-        Self {
-            writer: UnsafeCell::new(writer),
-            led: UnsafeCell::new(led),
-        }
-    }
-}
-unsafe impl<W, L> Send for SerialLogger<W, L> {}
-unsafe impl<W, L> Sync for SerialLogger<W, L> {}
-
-impl<W, L> log::Log for SerialLogger<W, L>
-where
-    W: serial::Write<u8>,
-    L: OutputPin + Send + Sync,
-{
-    fn enabled(&self, metadata: &Metadata) -> bool {
-        metadata.level() <= log::max_level()
-    }
-
-    fn log(&self, record: &Record) {
-        if !self.enabled(record.metadata()) {
-            return;
-        }
-
-        let jrb = unsafe { &mut JRB };
-        write!(
-            jrb,
-            "[{}] {} {} -- {}\r\n",
-            rtc::millis(),
-            record.level(),
-            record.target(),
-            record.args()
-        )
-        .ok();
-    }
-
-    fn flush(&self) {
-        // Unsafe due to mutable static. We can only deal with the
-        // tail position of the buffer here to keep things safe.
-        let jrb = unsafe { &mut JRB };
-        if jrb.lbr.is_empty() {
-            return;
-        }
-
-        let led = unsafe { &mut (*self.led.get()) };
-        let writer = unsafe { &mut (*self.writer.get()) };
-
-        led.set_high().ok();
-        while let Some(b) = jrb.lbr.shift() {
-            nb::block!(writer.w.write(b)).ok();
-        }
-        led.set_low().ok();
-    }
-}
-
-// Write to the UART right now, instead of putting it on a ring
-// buffer. This function is a huge hack, and only useful for debugging
-// either before the main loop starts or if the ring buffer is broken.
-pub unsafe fn write_fmt_now(args: fmt::Arguments, nl: bool) {
-    if UART0 == 0 {
-        return;
-    }
-    let uart: &mut UART0<Sercom0Pad3<Pa7<PfD>>, Sercom0Pad2<Pa6<PfD>>, (), ()> =
-        core::mem::transmute(UART0);
-    fmt::write(uart, args).expect("writing fmt now to uart");
-    if nl {
-        uart.write_str("\r\n").expect("writing nl now to uart");
-    }
-}
diff --git a/app/src/macros.rs b/app/src/macros.rs
deleted file mode 100644
index 46d2d07..0000000
--- a/app/src/macros.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-#[macro_export]
-macro_rules! logln_now {
-    ($($arg:tt)*) => {
-        unsafe {crate::logger::write_fmt_now(format_args!($($arg)*), true);}
-    };
-    (_) => {};
-}
-
-#[macro_export]
-macro_rules! log_now {
-    ($($arg:tt)*) => {
-        unsafe {crate::logger::write_fmt_now(format_args!($($arg)*), false);}
-    };
-    (_) => {};
-}
diff --git a/app/src/main.rs b/app/src/main.rs
deleted file mode 100755
index 1f8805b..0000000
--- a/app/src/main.rs
+++ /dev/null
@@ -1,227 +0,0 @@
-#![no_std]
-#![no_main]
-#![feature(const_fn)]
-#![feature(const_transmute)]
-#![allow(dead_code)]
-
-mod dotstar;
-mod logger;
-mod macros;
-mod rtc;
-
-//#[allow(unused)]
-//use panic_halt;
-
-use clint::HandlerArray;
-use cortex_m::asm::wfi;
-use cortex_m_rt::{entry, exception, ExceptionFrame};
-use embedded_hal::digital::v2::OutputPin;
-use log::{debug, info, LevelFilter};
-use smart_leds::colors;
-use smart_leds_trait::SmartLedsWrite;
-use trinket_m0::{
-    self as hal,
-    clock::GenericClockController,
-    gpio::{OpenDrain, Output, Pa10, Pa6, Pa7, PfD},
-    sercom,
-    target_device::{interrupt, Interrupt},
-    time::*,
-    CorePeripherals, Peripherals,
-};
-use usbh::USBHost;
-
-static HANDLERS: HandlerArray = HandlerArray::new();
-
-static mut LED: usize = 0;
-
-#[entry]
-fn main() -> ! {
-    let mut peripherals = Peripherals::take().expect("taking peripherals");
-    let mut core = CorePeripherals::take().expect("taking core peripherals");
-
-    let mut clocks = GenericClockController::with_internal_32kosc(
-        peripherals.GCLK,
-        &mut peripherals.PM,
-        &mut peripherals.SYSCTRL,
-        &mut peripherals.NVMCTRL,
-    );
-
-    let mut pins = hal::Pins::new(peripherals.PORT);
-
-    let uart = hal::uart(
-        &mut clocks,
-        115_200.hz(),
-        peripherals.SERCOM0,
-        &mut core.NVIC,
-        &mut peripherals.PM,
-        pins.d3,
-        pins.d4,
-        &mut pins.port,
-    );
-
-    let mut red_led = pins.d13.into_open_drain_output(&mut pins.port);
-    red_led.set_low().expect("turning off red LED");
-    unsafe { LED = core::mem::transmute(&red_led) }
-
-    // We do the transmute because, while all the underlying data is
-    // static, we're unable to get a referecence to the UART or LED
-    // until run-time. Another option would be to use Option in the
-    // SerialLogger definition, but that requires a check every time
-    // they might be used.
-    let uart_wrapped = logger::WriteWrapper::new(uart);
-    let logger = logger::SerialLogger::new(uart_wrapped, red_led);
-
-    // Wow, would I love to not be annotating this type.
-    let logger_ref: &'static logger::SerialLogger<
-        sercom::UART0<sercom::Sercom0Pad3<Pa7<PfD>>, sercom::Sercom0Pad2<Pa6<PfD>>, (), ()>,
-        Pa10<Output<OpenDrain>>,
-    > = unsafe { core::mem::transmute(&logger) };
-    unsafe { log::set_logger_racy(logger_ref).expect("couldn't set logger") };
-    log::set_max_level(LevelFilter::Info);
-
-    info!("setting up dotstar");
-
-    let mut dotstar = dotstar::new(
-        peripherals.SERCOM1,
-        pins.swdio,
-        pins.dotstar_di,
-        pins.dotstar_ci,
-        &mut pins.port,
-        &mut peripherals.PM,
-        &mut clocks,
-    );
-
-    let black = [colors::BLACK];
-    let blue = [colors::DARK_MAGENTA];
-
-    info!("setting up timer");
-    let mut rtc_handler = rtc::setup(peripherals.RTC, &mut clocks);
-
-    info!("setting up usb host");
-    let (mut usb_host, mut usb_handler) = USBHost::new(
-        peripherals.USB,
-        pins.usb_sof,
-        pins.usb_dm,
-        pins.usb_dp,
-        Some(pins.usb_host_enable),
-        &mut pins.port,
-        &mut clocks,
-        &mut peripherals.PM,
-        &rtc::millis,
-    );
-
-    info!("setting up handlers");
-    HANDLERS.with_overrides(|hs| {
-        hs.register(0, &mut rtc_handler);
-        core.NVIC.enable(Interrupt::RTC);
-
-        hs.register(1, &mut usb_handler);
-        unsafe { core.NVIC.set_priority(Interrupt::USB, 0) };
-        core.NVIC.enable(Interrupt::USB);
-
-        info!("Boot up complete.");
-
-        let mut last_tick = 0;
-        loop {
-            cortex_m::interrupt::free(|_cs| {
-                dotstar
-                    .write(black.iter().cloned())
-                    .expect("turning off dotstar");
-            });
-
-            let tick = rtc::millis();
-            if tick >= last_tick + 1_024 {
-                last_tick = tick;
-                // trace!("{}: tick\r\n", rtc::millis());
-            }
-
-            usb_host.task();
-
-            cortex_m::interrupt::free(|_cs| {
-                dotstar
-                    .write(blue.iter().cloned())
-                    .expect("turning on dotstar");
-            });
-            wfi();
-        }
-    });
-    unreachable!();
-}
-
-#[panic_handler]
-fn panic_handler(pi: &core::panic::PanicInfo) -> ! {
-    let red_led: &mut Pa10<Output<OpenDrain>> = unsafe { core::mem::transmute(LED) };
-    red_led.set_high().ok();
-
-    logln_now!("~~~ PANIC ~~~");
-    logln_now!("{}", pi);
-    logln_now!("flushing log");
-    loop {
-        log::logger().flush();
-        wfi()
-    }
-}
-
-#[exception]
-fn HardFault(ef: &ExceptionFrame) -> ! {
-    let red_led: &mut Pa10<Output<OpenDrain>> = unsafe { core::mem::transmute(LED) };
-    red_led.set_high().ok();
-
-    log::logger().flush();
-    logln_now!("!!! Hard Fault - ef: {:?} !!!", ef);
-    logln_now!("flushing log");
-    loop {
-        log::logger().flush();
-        wfi()
-    }
-}
-
-#[exception]
-fn DefaultHandler(interrupt: i16) {
-    let red_led: &mut Pa10<Output<OpenDrain>> = unsafe { core::mem::transmute(LED) };
-    red_led.set_high().ok();
-
-    debug!("*** Default Handler: {} ***", interrupt);
-}
-
-#[exception]
-fn NonMaskableInt() {
-    let red_led: &mut Pa10<Output<OpenDrain>> = unsafe { core::mem::transmute(LED) };
-    red_led.set_high().ok();
-
-    debug!("+++ NonMaskableInt +++");
-}
-
-#[exception]
-fn SVCall() {
-    let red_led: &mut Pa10<Output<OpenDrain>> = unsafe { core::mem::transmute(LED) };
-    red_led.set_high().ok();
-
-    debug!("+++ SVCall +++");
-}
-
-#[exception]
-fn PendSV() {
-    let red_led: &mut Pa10<Output<OpenDrain>> = unsafe { core::mem::transmute(LED) };
-    red_led.set_high().ok();
-
-    debug!("+++ PendSV +++");
-}
-
-#[exception]
-fn SysTick() {
-    let red_led: &mut Pa10<Output<OpenDrain>> = unsafe { core::mem::transmute(LED) };
-    red_led.set_high().ok();
-
-    debug!("+++ SysTick +++");
-}
-
-#[interrupt]
-fn RTC() {
-    HANDLERS.call(0);
-}
-
-#[interrupt]
-fn USB() {
-    HANDLERS.call(1);
-}
diff --git a/app/src/rtc.rs b/app/src/rtc.rs
deleted file mode 100644
index 79e450a..0000000
--- a/app/src/rtc.rs
+++ /dev/null
@@ -1,74 +0,0 @@
-use core::sync::atomic::{AtomicUsize, Ordering};
-use log;
-use trinket_m0::{clock::GenericClockController, RTC};
-
-struct Clock(AtomicUsize);
-impl Clock {
-    const fn new() -> Self {
-        Self(AtomicUsize::new(0))
-    }
-
-    fn set(&self, millis: usize) {
-        self.0.store(millis, Ordering::SeqCst)
-    }
-
-    // Slightly less than 1ms, due to using a 32,768Hz clock, we can't
-    // hit exactly 1ms, so we shoot for a bit under.
-    fn millis(&self) -> usize {
-        self.0.load(Ordering::SeqCst)
-    }
-}
-
-static CLOCK: Clock = Clock::new();
-
-// Set to run every ~500µs.
-static COUNTER: u32 = 16; // 32 ticks requires 1024 cycles at 32,768Hz for 1 second.
-
-pub fn setup(mut rtc: RTC, clocks: &mut GenericClockController) -> impl FnMut() {
-    let rtc_clock = &clocks.gclk1();
-    clocks.rtc(&rtc_clock);
-
-    rtc.mode0().ctrl.write(|w| w.swrst().set_bit());
-    while rtc.mode0().status.read().syncbusy().bit_is_set() {}
-
-    rtc.mode0().ctrl.write(|w| {
-        w.mode().count32();
-
-        // Neither the prescaler nor matchlr values seem to work. Not
-        // sure why.
-        //w.prescaler().div1024();
-        w.matchclr().set_bit() // Reset on match for periodic
-    });
-
-    rtc.mode0().comp[0].write(|w| unsafe { w.bits(COUNTER) });
-    rtc.mode0().intflag.write(|w| w.cmp0().set_bit());
-    rtc.mode0().intenset.write(|w| w.cmp0().set_bit());
-
-    // Enable the RTC and wait for sync.
-    rtc.mode0().ctrl.write(|w| w.enable().set_bit());
-    while rtc.mode0().status.read().syncbusy().bit_is_set() {}
-
-    move || handler(&mut rtc)
-}
-
-pub fn millis() -> usize {
-    CLOCK.millis()
-}
-
-fn handler(rtc: &mut RTC) {
-    // FIXME: matchclr doesn't seem to work to reset the counter?
-    rtc.mode0().count.write(|w| unsafe { w.bits(0) });
-    rtc.mode0().intflag.write(|w| w.cmp0().set_bit());
-
-    static mut TICKS: usize = 0;
-    static mut ADD: bool = false;
-    unsafe {
-        if ADD {
-            TICKS += 1;
-            CLOCK.set(TICKS);
-        }
-        ADD = !ADD;
-
-        log::logger().flush();
-    }
-}