Improve panic messages on softdevice faults. Fixes #45

1 files changed, 18 insertions, 1 deletions

diff --git a/nrf-softdevice/src/softdevice.rs b/nrf-softdevice/src/softdevice.rs
index d62e014..3860334 100644
--- a/nrf-softdevice/src/softdevice.rs
+++ b/nrf-softdevice/src/softdevice.rs
@@ -10,7 +10,24 @@ use crate::raw;
 use crate::RawError;
 
 unsafe extern "C" fn fault_handler(id: u32, pc: u32, info: u32) {
-    panic!("fault_handler {:?} {:?} {:?}", id, pc, info);
+    match (id, info) {
+        (raw::NRF_FAULT_ID_SD_ASSERT, _) => panic!(
+            "Softdevice assertion failed: an assertion inside the softdevice's code has failed. Most common cause is disabling interrupts for too long. Make sure you're using nrf_softdevice::interrupt::free instead of cortex_m::interrupt::free, which disables non-softdevice interrupts only. PC={:?}",
+            pc
+        ),
+        (raw::NRF_FAULT_ID_APP_MEMACC, 0) => panic!(
+            "Softdevice memory access violation. Your program accessed RAM reserved to the softdevice. PC={:?}",
+            pc
+        ),
+        (raw::NRF_FAULT_ID_APP_MEMACC, _) => panic!(
+            "Softdevice memory access violation. Your program accessed registers for a peripheral reserved to the softdevice. PC={:?} PREGION={:?}",
+            pc, info
+        ),
+        _ => panic!(
+            "Softdevice unknown fault id={:?} pc={:?} info={:?}",
+            id, pc, info
+        ),
+    }
 }
 
 #[allow(non_snake_case)]