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printf() causes crash before being called

Pete Roberts

Hi,
Using Keil uVision 5.11 with Cortex M4 target.

I wrote a program with printf() calls. I added a fputc() & output to UART.
I have now created another project with the same fputc().
If in the second program I add a printf() then I get an exception before main().
If I remove the printf() then all is OK.

I suspect that something is missing & that the exception is down to late linking (scatter?).

I would like to understand what changes I need to make to the second project such that I know how to create a project from start.
What am I missing?
If this is a late link issue then how do I force a full link?

Parents
  • 0 in reply to Westonsupermare Pier

    Thanks. Using NXP, my understanding is that CMSIS may not be applicable.

    Turns out that I had not included retarget.h. Would like to know how to get the linker to tell me that it will insert a breakpoint for next WEAK disaster!
    Still new with the debugger/assembler & suppose that the breakpoint is just close to an exception vector.

Reply
  • 0 in reply to Westonsupermare Pier

    Thanks. Using NXP, my understanding is that CMSIS may not be applicable.

    Turns out that I had not included retarget.h. Would like to know how to get the linker to tell me that it will insert a breakpoint for next WEAK disaster!
    Still new with the debugger/assembler & suppose that the breakpoint is just close to an exception vector.

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