SW4STM32C datasheet(50/99 Pages) STMICROELECTRONICS

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Exception handling

AN4989

50/99

DocID030181 Rev 2

This simple declaration overriding the default weak function,removes ambiguity and clarifies

the call stack.

In order to trap the exception, a hardware or a software breakpoint can be set in the IDE or

directly programmed in the source code using ARM® instruction BKPT.

Caution:

BKPT is not tolerated if no debugger is connected (refer to Chapter 9: From debug to

release on page 76). it is advised to set it under #ifdef statement.

In-line insertion of assembly instruction in application C code depends on the IDE.

•

IAR™ and SW4STM32

void NMI_Handler(void)

{

#ifdef DEBUG

asm ("BKPT 0");

#endif

}

•

Keil®

void NMI_Handler(void)

{

#ifdef DEBUG

__asm

{

BKPT 0

}

#endif

}

For each IDE, it is also possible to use the abstraction function defined in the CMSIS library

and provided in STM32Cube software pack.

void NMI_Handler(void)

{

#ifdef DEBUG

__BKPT(0);

#endif

}

In all cases, the Halt Debug-Mode is entered; it allows to investigate the issue by inspecting

Call Stack and Registers content.

Tip:

On Keil® MDK-ARM µVISION, the caller code is not directly accessible in the Call

Stack Window. Right clicking "Show Caller Code" as in Figure 32 leads to the

faulty line.

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