1 files changed, 53 insertions, 17 deletions

diff --git a/ble/src/main.rs b/ble/src/main.rs
index 8b8c513..6f167a5 100644
--- a/ble/src/main.rs
+++ b/ble/src/main.rs
@@ -1,39 +1,75 @@
 //! BLE interface.
+
 #![no_std]
 #![no_main]
 
-use core::fmt::Write;
+mod logger;
+mod macros;
+mod rtc;
+
+use clint::HandlerArray;
+use core::mem;
+use cortex_m::asm::wfi;
 use cortex_m_rt::entry;
-use nb::block;
+use log::{info, trace, LevelFilter};
 
 #[allow(unused_imports)]
 extern crate panic_semihosting;
 
 use nrf52840_mdk_bsp::{
     hal::{
-        prelude::*,
-        timer::{self, Timer},
+        target::{interrupt, Interrupt, UARTE0},
+        Clocks, Rtc,
     },
     Board,
 };
 
+// TODO:
+//   * set up serial reader for trinket
+//   * set up i²c interface for keyboard reports
+//   * and, finally, bluetooth
+
+// Interrupt handler table.
+static HANDLERS: HandlerArray = HandlerArray::new();
+
 #[entry]
 fn main() -> ! {
-    let mut nrf52 = Board::take().unwrap();
+    let nrf52 = Board::take().unwrap();
+
+    let uart_wrapped = logger::WriteWrapper::new(nrf52.cdc);
+    let logger = logger::SerialLogger::new(uart_wrapped);
+    let logger_ref: &'static logger::SerialLogger<UARTE0> = unsafe { mem::transmute(&logger) };
+    log::set_logger(logger_ref).expect("setting logger");
+    log::set_max_level(LevelFilter::Trace);
+
+    nrf52.RTC0.intenset.write(|w| w.tick().set());
+
+    let mut nvic = nrf52.NVIC;
+    let mut rtc_handler = rtc::setup(Rtc::new(nrf52.RTC0), Clocks::new(nrf52.CLOCK));
 
-    let mut timer = Timer::new(nrf52.TIMER0);
+    logln_now!("logln_now?");
+    HANDLERS.with_overrides(|hs| {
+        hs.register(0, &mut rtc_handler);
+        nvic.enable(Interrupt::RTC0);
 
-    write!(nrf52.cdc, "Bootstrap complete.").ok();
-    loop {
-        write!(nrf52.cdc, ".").ok();
-        delay(&mut timer, 1_000_000); // 1s
-    }
+        info!("Bootstrap complete.");
+        let mut last_tick = rtc::millis();
+        last_tick -= last_tick % 1024;
+        loop {
+            let tick = rtc::millis();
+            if tick >= last_tick + 1024 {
+                last_tick = tick;
+                last_tick -= last_tick % 1024;
+                trace!(".");
+            }
+            wfi();
+        }
+    });
+    unreachable!();
 }
 
-fn delay<T>(timer: &mut Timer<T>, cycles: u32)
-where
-    T: timer::Instance,
-{
-    timer.start(cycles);
-    let _ = block!(timer.wait());
+// TODO: RTC0/1/2 exist. See which is best, if it matters.
+#[interrupt]
+fn RTC0() {
+    HANDLERS.call(0);
 }