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Writing to flash without debugger crashes

Julia Gaedecke

Hi,

I wrote a program, where some data is written to the internal flash of a stm32f4.
If I am debugging everything works fine, but if the controller runs without the debugger, the data is not written.

Can somebody tell me why this happens?

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  • 0

    Your code is broken? Or makes invalid assumptions?

    Perhaps you are not setting things up properly, or expecting clocks/status to be in some specific state, and the debugger leaves them in a non-default state?

    Without a debugger you can still output data via a USART, or status via GPIO/LED. Where exactly does your code, and flash programming/erasing sequence fall over?

    I'd assume you'd at least need to unlock and clear the flash controllers flags/errors/status before starting.

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  • 0

    Your code is broken? Or makes invalid assumptions?

    Perhaps you are not setting things up properly, or expecting clocks/status to be in some specific state, and the debugger leaves them in a non-default state?

    Without a debugger you can still output data via a USART, or status via GPIO/LED. Where exactly does your code, and flash programming/erasing sequence fall over?

    I'd assume you'd at least need to unlock and clear the flash controllers flags/errors/status before starting.

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