From 8ee09500054e2b88e8ec3dfd45f1691cd98c3493 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Robert=20J=C3=B6rdens?= <rj@quartiq.de>
Date: Fri, 7 Jun 2019 11:26:24 +0200
Subject: [PATCH] panic: turn red leds on

---
 src/main.rs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index ce3f3d8..9b4c25b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,8 +4,16 @@
 // Enable returning `!`
 #![feature(never_type)]
 
+#[inline(never)]
+#[panic_handler]
 #[cfg(not(feature = "semihosting"))]
-extern crate panic_abort;
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    let dp = unsafe { pac::Peripherals::steal() };
+    dp.GPIOD.odr.modify(|_, w| w.odr6().high());  // FP_LED_1
+    dp.GPIOG.odr.modify(|_, w| w.odr4().high());  // FP_LED_3
+    loop { core::sync::atomic::compiler_fence(core::sync::atomic::Ordering::SeqCst); }
+}
+
 #[cfg(feature = "semihosting")]
 extern crate panic_semihosting;