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Locating 2 parameters at the same address

Jeff Tonkinson

I am using an 8051 (C51/BL51) with no off-chip memory. I have two functions with parameters:

void Detect( U8 iLed )

and

static U8 INHSampleHandler( U16 u16Sample )


Now I understand that Keil will allocate a variable (in DATA) for these. The problem seems to be that the locator is using the same memory location for both. I cannot understand why.

Below are excerpts from the scratchpad showing 2 "D:0026H". These are the only places these symbols are declared. Any ideas what I'm doing wrong?

Thanks,
Jeff

BL51 BANKED LINKER/LOCATER V5.12              07/14/2011  09:36:23  PAGE 1


BL51 BANKED LINKER/LOCATER V5.12, INVOKED BY:
Z:\TOOLS\SOFTWARE\KEIL\BL51.EXE Z:\Software\FB_CPU_Init.obj,
>> Z:\Software\Settings.obj, Z:\Software\Glo
>> bals.obj, Z:\Software\Devices\Clock.obj, Z:\ 
>> Software\Devices\Flash.obj, Z:\Software\Devices\HMI.obj
>> , Z:\Software\Devices\INH.obj, Z:\ 
>> Software\Devices\ADC.obj, Z:\Software\Devices\Timer.obj, Z
>> :\Software\Builds\TestINH - 06-00039-21-09\Main.obj
>> , Z:\Software\Test\Test_Button.obj, Z:\So
>> ftware\Builds\TestINH - 06-00039-21-09\Version.obj TO Z:\ 
>> Software\Builds\TestINH - 06-00039-21-09\06-00039-21-09-xx.wsp
>>  RS (256) PL (68) PW (78) XDATA (?XD?SETTINGS (0X0)) CODE (?CO?VERSION (0X7
>> FC0))


MEMORY MODEL: SMALL

Deleted for brevity

  -------         PROC          _INHSAMPLEHANDLER
  D:0026H         SYMBOL        u16Sample
  C:0BF1H         LINE#         150
  C:0BF5H         LINE#         151
  C:0BF5H         LINE#         207
  C:0BF7H         LINE#         208
  -------         ENDPROC       _INHSAMPLEHANDLER
  -------         ENDMOD        INH

Deleted for brevity

  C:09FEH         PUBLIC        _Detect
  C:074EH         PUBLIC        main
  -------         PROC          _DETECT
  D:0026H         SYMBOL        iLed

Parents
  • 0 in reply to Jeff Tonkinson

    I don't see the relavance of this to my issue of overlaying parameters.

    It is true that my ISR is calling the function by pointer

    The linker has a real problem with resolving the call table when functions are called by pointers.

    I have, realizing how cumbersome function pointers are in the '51 architecture, avoided function pointers totally when working with the '51, and can thus not answer with a link. However from other posts I know there is something in the documentation about how to resolve this issue by special linker usage.

    Erik

    PS note "how cumbersome function pointers are in the '51 architecture" not the tools, although as seen above, that is true too.

Reply
  • 0 in reply to Jeff Tonkinson

    I don't see the relavance of this to my issue of overlaying parameters.

    It is true that my ISR is calling the function by pointer

    The linker has a real problem with resolving the call table when functions are called by pointers.

    I have, realizing how cumbersome function pointers are in the '51 architecture, avoided function pointers totally when working with the '51, and can thus not answer with a link. However from other posts I know there is something in the documentation about how to resolve this issue by special linker usage.

    Erik

    PS note "how cumbersome function pointers are in the '51 architecture" not the tools, although as seen above, that is true too.

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