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Problem in stimulation

Pranav Dahiya

I am working on a project in which i am using at89c2051. When I wrote a program and built it using c51 the following message was displayed:

Build target 'Target 1'
linking...
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL SYMBOL: ?C_START MODULE: STARTUP.obj (?C_STARTUP)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: ?C_START MODULE: STARTUP.obj (?C_STARTUP) ADDRESS: 080AH
Program Size: data=9.0 xdata=0 code=15
"L2" - 0 Error(s), 2 Warning(s).

Ignoring this I decided to simulate the program but the register values were not being displayed.
Why is this happening? Is there any problem in the startup.a51 file?

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  • 0 in reply to ²erik malund

    "I recall a previous post where the poster thought startup.a51 was required for assembly programs, could that be it?"

    That sounds very plausible!

    As already noted, the messages are just warnings - not errors.
    IIRC, that means that the code just mentioned ("referenced") the undefined symbols as EXTERN or similar - it only becomes an error when you actually try to use the symbol...

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  • 0 in reply to ²erik malund

    "I recall a previous post where the poster thought startup.a51 was required for assembly programs, could that be it?"

    That sounds very plausible!

    As already noted, the messages are just warnings - not errors.
    IIRC, that means that the code just mentioned ("referenced") the undefined symbols as EXTERN or similar - it only becomes an error when you actually try to use the symbol...

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