RTX51 TINY: Multiple Public Definitions RTX_RAMTOP (Part 2)

Information in this article applies to:

• RTX51 Tiny

QUESTION

I recently upgraded my compiler. Now my project, which uses RTX Tiny, generates linker errors:

*** ERROR L104: MULTIPLE PUBLIC DEFINITIONS
    SYMBOL:  ?RTX_CURRENTTASK
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_KERNAL)
*** ERROR L104: MULTIPLE PUBLIC DEFINITIONS
    SYMBOL:  ?RTX_RAMTOP
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_KERNAL)
*** WARNING L4: DATA SPACE MEMORY OVERLAP
    FROM:    0008H
    TO:      000DH
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
    SYMBOL:  ?RTX_CURRENTTASK
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_OS_CREATE)
    ADDRESS: 0731H
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
    SYMBOL:  ?RTX_RAMTOP
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_OS_CREATE)
    ADDRESS: 0745H
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
    SYMBOL:  ?RTX_CURRENTTASK
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_OS_CREATE)
    ADDRESS: 076FH
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
    SYMBOL:  ?RTX_CURRENTTASK
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_OS_DELETE)
    ADDRESS: 07BAH
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
    SYMBOL:  ?RTX_RAMTOP
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_OS_DELETE)
    ADDRESS: 07D3H
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
    SYMBOL:  ?RTX_CURRENTTASK
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_OS_DELETE)
    ADDRESS: 07F1H
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
    SYMBOL:  ?RTX_CURRENTTASK
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_OS_DELETE)
    ADDRESS: 080CH
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
    SYMBOL:  ?RTX_CURRENTTASK
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_OS_DELETE)
    ADDRESS: 081FH
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
    SYMBOL:  ?RTX_CURRENTTASK
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_OS_RUNNING_TASK_ID)
    ADDRESS: 086DH
*** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
    SYMBOL:  ?RTX_CURRENTTASK
    MODULE:  C:\KEIL\C51\LIB\RTX51TNY.LIB (?RTX51_TINY_OS_WAIT)
    ADDRESS: 0875H

The code was working before the upgrade. What am I doing wrong? For compliance reasons, I need to use RTX tiny version 1, and cannot upgrade to RTXtiny2

ANSWER

C51 version 7.02 includes RTX51 Tiny Version 2 (RtxTiny2). RtxTiny2 contains several new enhancements. C51 version 7.02 by default uses the RtxTiny2 library. However, it is possible to use RTX tiny version 1's library.

Manually add the RTX51 Tiny Version 1 library to the project workspace window. The version 1 libraries are located at:
\Keil\C51\RTX_TINY\RTX51TNY.LIB

When you add the version 1 library to your project, the linker will not link the version 2 library into your project. This will remove the errors shown above.

This option is best if you must use RTX51 Tiny Version 1, and you are using CONF_TNY.A51 (the configuration file for RTX tiny version 1).

Note that the old configuration file is CONF_TNY.A51 and is located at:
\Keil\C51\RTX_TINY\CONF_TNY.A51 (Upper case file name)

The new configuration file is CONF_TNY.A51 and is located at:
\Keil\C51\RtxTiny2\SourceCode\Conf_tny.A51 (Lower case file name)

MORE INFORMATION

• Refer to the RTX51 Tiny User's Guide.
• Refer to What's New in the RTX51 Tiny User's Guide.

SEE ALSO

• RTX51 TINY: User Interrupt Function does not work
• RTX51 TINY: Interrupts Stop Working
• RTX51 TINY: Multiple Public Definitions RTX_RAMTOP (PART 1)

Last Reviewed: Thursday, February 25, 2021