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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 ImPer Westermark

    try unchecking options for target>Uililties>settings>Reset and run. (keep the clock speed low)

    That will leave the chip in its 'native state' and ulink will connect unless you have a hardware error.
    whether this allow you to see the effects of 'step into' (once) should deternine the course of action

    Erik

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  • 0 in reply to ImPer Westermark

    try unchecking options for target>Uililties>settings>Reset and run. (keep the clock speed low)

    That will leave the chip in its 'native state' and ulink will connect unless you have a hardware error.
    whether this allow you to see the effects of 'step into' (once) should deternine the course of action

    Erik

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  • 0 in reply to erik malund

    (keep the clock speed low) refer to the JTAG clock, 1MHz should be good

    Erik

  • 0 in reply to erik malund

    Thanks to everyone that has posted a response. I'm sorry I have been unable to reply to anything for a few days. Here are a few replies for some of the questions people have asked:

    "Can you try with a different device? Have you programmed something into that device?"

    The device I am using has previously been programmed with code for the application I am developing. This code essentially works, there are a couple of bugs though which is what I am trying to figure out. I have erased the device before trying to debug the code but this makes no difference. I am trying to get my hands on a device that hasn't previously been programmed.

    "In case a downloaded application configures the clocking incorrectly.."

    As above: the application code has already been programmed to the board and does run, it's just that it wont debug. Someone else that used to work on this application has managed to debug the code before but I am no longer in contact with him which is why I am stuck trying to get this to work.

    "try unchecking options for target>Uililties>settings>Reset and run (keep the clock speed low) refer to the JTAG clock, 1MHz should be good"

    This has already been tried without success, the 1MHz JTAG clock speed is the default. I have tried slower speeds (with Reset and run checked and unchecked) which made no difference.

    "CRP enabled..."

    Not as far as I am aware but I am very new to embedded systems development. I am hoping when I get a device that hasn't been previously programmed it will give me a better insight into what is happening.