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CTRLSTAT = 0xffffffff

harshan

Sir,

I am working on Cortex-M4 over serial wire debug protocol, i am able to read IDCODE(0x2ba01477) which is correct as per arm cortex m4 technical reference manual, and i am writing 0x50000000 to CTRLSTAT register to enable CSYSPWRUPREQ and CDBGPWRREQ which is also success without any ACK error,but the thing is when i am trying to read the CTRLSTAT register i got 0xffffffff . I don't understand what might be the problem,Please suggest me what would be the problem??

Thanks & Regards

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  • 0 in reply to harshan

    Unfortunately I'm not an expert in this area, so I don't know much about breakpoints and watchpoints.

    I went to the ARM Information Center and searched for 'watchpoint', as this is not technology specific to the STM device, but it's ARM technology.

    Scrolling down, I find the results for ARM Cortex-M4 Processor Technical Reference Manual, I click it, and I click the DWT Programmers Model link in there.

    This shows addresses of hardware registers.

    If you look at CWT_CTRL, it says "See [a]", which refers to a note giving you some more information: There are (up to) four comparators for watchpoints and triggers.

    In RM0090, sectino 38.13, you'll find some information about what's implemented in your device, combining this with the information found in the Cortex-M4 Technical Reference Manual should get you a bit further.

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  • 0 in reply to harshan

    Unfortunately I'm not an expert in this area, so I don't know much about breakpoints and watchpoints.

    I went to the ARM Information Center and searched for 'watchpoint', as this is not technology specific to the STM device, but it's ARM technology.

    Scrolling down, I find the results for ARM Cortex-M4 Processor Technical Reference Manual, I click it, and I click the DWT Programmers Model link in there.

    This shows addresses of hardware registers.

    If you look at CWT_CTRL, it says "See [a]", which refers to a note giving you some more information: There are (up to) four comparators for watchpoints and triggers.

    In RM0090, sectino 38.13, you'll find some information about what's implemented in your device, combining this with the information found in the Cortex-M4 Technical Reference Manual should get you a bit further.

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