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Stack issue.

Mill Michael

Hi ALL,
I using STARTUP.A51 in my C51 Project,It will be start the sp at 0x07, becuase I define many idata in my program.When Call a function in C program, The idata overlap the push value make program counter jmup to error address when in debug mode.
Why the compilier don't auto setting stack ?

Thanks.

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  • 0 in reply to Mill Michael

    Hi Free,

    How about modifing the following code in startup.a51:

    ?STACK		SEGMENT   IDATA

		RSEG	?STACK
		DS		64

		MOV	SP,#?STACK-1

    Acturally your stack pointer will be put at the end of idata address you are using. If you got a compile error to tell you that idata overlaps, then you have to shorten your statck length.
    It should be easy to understand when you have a look at the *.m51 file.

    Frank Hu

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  • 0 in reply to Mill Michael

    Hi Free,

    How about modifing the following code in startup.a51:

    ?STACK		SEGMENT   IDATA

		RSEG	?STACK
		DS		64

		MOV	SP,#?STACK-1

    Acturally your stack pointer will be put at the end of idata address you are using. If you got a compile error to tell you that idata overlaps, then you have to shorten your statck length.
    It should be easy to understand when you have a look at the *.m51 file.

    Frank Hu

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