feat: leave MPU enabled during interrupt handlers

keepkey · Apr 15, 2022 · f8fd1fb · f8fd1fb
1 parent 447c1f0
commit f8fd1fb
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/lib/board/memory.c b/lib/board/memory.c
@@ -114,9 +114,9 @@ void mpu_config(int priv_level) {
   MPU_RASR = MPU_RASR_ENABLE | MPU_RASR_ATTR_PERIPH | MPU_RASR_SIZE_1KB |
              MPU_RASR_ATTR_AP_PRW_URW | MPU_RASR_ATTR_XN;
 
-  // Enable MPU and use the default system memory privileges as the background
-  // execution of the system memory map.
-  MPU_CTRL = MPU_CTRL_ENABLE | MPU_CTRL_PRIVDEFENA;
+  // Enable MPU, use the default system memory privileges as the background
+  // execution of the system memory map, and keep the MPU on during interrupts.
+  MPU_CTRL = MPU_CTRL_ENABLE | MPU_CTRL_PRIVDEFENA | MPU_CTRL_HFNMIENA;
 
   // Enable memory fault handler
   SCB_SHCSR |= SCB_SHCSR_MEMFAULTENA;