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Could not stop Cortex-M device

Stephen Goodman

I am having trouble running the debugger on a STM32F205ZG using µVision4 and the ULINK2. I keep getting the error message "Could not stop Cortex-M device! Please check the JTAG cable." I am using the SW port. Any help with this would be greatly appreciated.

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  • 0 in reply to Stephen Goodman

    I remembered a bit more now, I was generating an exception which was not handled causing the default handler to be called, this is simply a branch back to itself which seems to hang the bus.
    I modified the default handler to have a small loop with nop instructions instead of a branch back to itself so that the debugger can gain access.

    since then I haven't needed to use the LPCXpresso .

    regards

    Phil.

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  • 0 in reply to Stephen Goodman

    I remembered a bit more now, I was generating an exception which was not handled causing the default handler to be called, this is simply a branch back to itself which seems to hang the bus.
    I modified the default handler to have a small loop with nop instructions instead of a branch back to itself so that the debugger can gain access.

    since then I haven't needed to use the LPCXpresso .

    regards

    Phil.

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