Migrate everything over to separate libraries.

  * `usb-host` is the crate containing the HAL traits.

  * `bootkbd` is a crate for a bare-bones boot protocol keyboard
    driver.

  * `samd21-host` is a crate with an implementation of `usb-host` for
    a SAMD21 platform, with an example for the trinket-m0 which uses
    the `bootkbd` driver to print keyboard reports.

1 files changed, 0 insertions, 139 deletions

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");
-    }
-}