Stack guard is a module that helps detect stack violation which can be caused by errors in the code or by a too small stack size.

It is difficult to detect issues related to stack overflow because symptoms differ in every case and they may appear a long time after stack violation has occurred. The stack guard uses MPU (Memory Protection Unit) driver to protect a block of memory at the base of the main stack. MPU generates an exception on the first stack violation.

Note

When stack guard is enabled, the usable size of the stack is reduced by NRF_STACK_GUARD_CONFIG_SIZE because the protected memory block is within the stack.

For API documentation of this module, see Stack guard .