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hex file generation

nels eira

Hi,

I have a simple project in Keil with follow files.

startup.a51 that contains.
$NOMOD51
CSEG AT 0xFC00
BootHeaderData: DB 0xA5, \ 0xFF, \ 0x01, \ 0x00 NAME ?C_STARTUP

?C_C51STARTUP SEGMENT CODE
?STACK SEGMENT IDATA RSEG ?STACK DS 10 EXTRN CODE (?C_START) PUBLIC ?C_STARTUP CSEG AT 0xFC04
?C_STARTUP: LJMP STARTUP1

RSEG ?C_C51STARTUP
STARTUP1: MOV SP,#?STACK-1 ; assign stack at beginning

LJMP ?C_START ;reset location (jump to start main)

END
--------------------------------------------
and I have my main.c file

void main(void)
{ unsigned char i =0;

i = i +1; while(1);
}

What I don't understant is the hex file generated by compiler contain some additional code after the inst.
LJMP ?C_START
only after the execution of "some" code that compiler generate my main function is executed.

Any knows what code is generated? I don't want that the compiler generate this "additional" code, how I can do this?
Thank you!

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  • 0 

    LJMP ?C_START ;reset location (jump to start main)


    Your comment is not quite correct. startup.a51 is for you to configure to match your particular hardware; after this, the compiler does its standard start-up stuff - including setting variables defined with initialisers, etc. Only then does it actually call your main() function. C_START is the start of the compiler's runtime initialisation; it is not the start of your main() function.

    http://www.keil.com/support/docs/2011.htm

Reply
  • 0 

    LJMP ?C_START ;reset location (jump to start main)


    Your comment is not quite correct. startup.a51 is for you to configure to match your particular hardware; after this, the compiler does its standard start-up stuff - including setting variables defined with initialisers, etc. Only then does it actually call your main() function. C_START is the start of the compiler's runtime initialisation; it is not the start of your main() function.

    http://www.keil.com/support/docs/2011.htm

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