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Flash programming & Thumb mode

Lillian XU

Hi All,

I use the Keil uVersion3 and MCBSTR9 EVAL board to run the FMI example from ST and find it is not working unless you compile the code in thumb-mode instead of ARM-mode. Can anyone give me a clue what difference between thumb and ARm mode? Why the FMI example can only work in Thumb mode? Highly appreciate any info.

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  • 0 in reply to Robert  

    Hi Robert Rostohar,

    Thank you for your info.
    You means that the FMI exmaple can work in the following two cases.
    1. load the FMI example image into RAM and run it.
    2. Set the thumb mode to compile and Load FMI example image into flash banks 0.

    My issue is why the FMI can work if I compile in Thumb mode.

    Thank you very much for your help.

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  • 0 in reply to Robert  

    Hi Robert Rostohar,

    Thank you for your info.
    You means that the FMI exmaple can work in the following two cases.
    1. load the FMI example image into RAM and run it.
    2. Set the thumb mode to compile and Load FMI example image into flash banks 0.

    My issue is why the FMI can work if I compile in Thumb mode.

    Thank you very much for your help.

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