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how to define a byte variable in bit addressing space in assembly

chao lin

Hi,

There is am assembly file that will be integrated into my project that is written in c. A variable defined in the assembly file as

PROCTOCOL  equ  020H
I converted it to
RSEG ?BI?RunIsp?ISP
?RunIsp?BIT:
PROTOCOL:  DBIT  8
The compiler gave me two errors:
1. DATA-ADDRESS EXPECTED
2. INVALID BYTE BASE IN BIT ADDRESS EXPRESSION

The first error was caused by
MOV	PROTOCOL, #0
and the second error was caused by
SETB	PROTOCOL^1

How should I define PROTOCOL to make it work in c environment? Thank you for answering my question.

chao.

  • 0

    Hi,

    Did I provide not enough information about my question?
    The original assembly file compiled successfully. The file is like

    ...
PROCTOCOL  equ  020H
...
...
MOV	PROTOCOL, #0
...
...
SETB	PROTOCOL^1
...
...
    I modified the declaration of PROCOCOL to
    ...
?BI?RunIsp?ISP SEGMENT BIT OVERLAYABLE
...
...
RSEG ?BI?RunIsp?ISP
?RunIsp?BIT:
PROTOCOL:	DBIT	8
...
...
    so my project written in c can use this file. After compilation, I got the two errors mentioned in the previous thread.

    chao.