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    • initialise_monitor_handles causes SIGTRAP

    Posted by cbenson on 2016-02-10 21:01

    I am trying to use SWO/SWV on a STM32F429i-Disco.
    My Linker flags are : -specs=nosys.specs -specs=nano.specs -specs=rdimon.specs -u _printf_float
    Debugger Startup flags: monitor reset halt arm semihosting enable

    What have I missed?

    Reads: 13827
    Posted by tarek bouchkati on 2016-02-11 11:42 Tunisia

    Yes, this incomplete configuration is to enable semihosting (not SWO/SWV) :
    you have missed the : -lc -lrdimon
    the complete linker flags are :

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    -specs=nano.specs -u _printf_float -specs=rdimon.specs -lc -lrdimon


    To use SWO/SWV:
    in syscalls.c, add #include "stm32f4xx.h" (depends on your device) & (you should include CMSIS folder)
    and modify the _write function :

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    int _write(int file, char *ptr, int len)
{
	int DataIdx;

	for (DataIdx = 0; DataIdx < len; DataIdx++)
	{
	   ITM_SendChar( *ptr++ );
	}

	return len;
}


    After that, you can use printf to output message via printf.

    To visualize the ITM output, you can use ST-Link Utility (menu : ST-LINK > Printf via SWO Viewer)

    Best Regards,
    Tarek