From 7d64ea99fdbb04f93f23abbc9d0470e77ce9e1b5 Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Mon, 12 Aug 2019 12:13:21 -0400
Subject: Add HardFault handler.

---
 ble/src/main.rs | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/ble/src/main.rs b/ble/src/main.rs
index 6f167a5..0fed859 100644
--- a/ble/src/main.rs
+++ b/ble/src/main.rs
@@ -10,7 +10,7 @@ mod rtc;
 use clint::HandlerArray;
 use core::mem;
 use cortex_m::asm::wfi;
-use cortex_m_rt::entry;
+use cortex_m_rt::{entry, exception, ExceptionFrame};
 use log::{info, trace, LevelFilter};
 
 #[allow(unused_imports)]
@@ -47,12 +47,12 @@ fn main() -> ! {
     let mut nvic = nrf52.NVIC;
     let mut rtc_handler = rtc::setup(Rtc::new(nrf52.RTC0), Clocks::new(nrf52.CLOCK));
 
-    logln_now!("logln_now?");
     HANDLERS.with_overrides(|hs| {
         hs.register(0, &mut rtc_handler);
         nvic.enable(Interrupt::RTC0);
 
         info!("Bootstrap complete.");
+
         let mut last_tick = rtc::millis();
         last_tick -= last_tick % 1024;
         loop {
@@ -68,7 +68,17 @@ fn main() -> ! {
     unreachable!();
 }
 
-// TODO: RTC0/1/2 exist. See which is best, if it matters.
+#[exception]
+fn HardFault(ef: &ExceptionFrame) -> ! {
+    log::logger().flush();
+    logln_now!("!!! Hard Fault - ef: {:?} !!!", ef);
+    logln_now!("flushing log");
+    loop {
+        log::logger().flush();
+        wfi()
+    }
+}
+
 #[interrupt]
 fn RTC0() {
     HANDLERS.call(0);
-- 
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