An issue with ARM interrupts revisits.

[Sebastian Huber]

On 22/11/17 07:33, Sebastian Huber wrote:
> I have absolutely no idea how you can end up in 
> _ARMV7M_Thread_dispatch() with an unexpected interrupt level.

I think if you call an operating system service which leads to a thread 
dispatch in a NMI handler, then you could end up with this situation. 
You can test this with the following patch and run the spintrcritical10 
test program.

diff --git 
a/c/src/lib/libbsp/arm/shared/armv7m/clock/armv7m-clock-config.c 
b/c/src/lib/libbsp/arm/shared/armv7m/clock/armv7m-clock-config.c
index 1c17a92cb5..f0ebe1506f 100644
--- a/c/src/lib/libbsp/arm/shared/armv7m/clock/armv7m-clock-config.c
+++ b/c/src/lib/libbsp/arm/shared/armv7m/clock/armv7m-clock-config.c
@@ -104,7 +104,7 @@ static void _ARMV7M_Systick_handler_install(void)
  {
    _ARMV7M_Set_exception_priority_and_handler(
      ARMV7M_VECTOR_SYSTICK,
-    BSP_ARMV7M_SYSTICK_PRIORITY,
+    1,
      _ARMV7M_Systick_handler
    );
  }

-- 
Sebastian Huber, embedded brains GmbH

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