A51: FATAL ERROR (CAN'T OPEN FILE) WITH C HEADER FILES

Information in this article applies to:

• C51 All Versions
• C51 Version 7.50

QUESTION

When including C header files in assembly modules, the .H files cannot be found in some instances. For example, when including C header files as follows:

$include (reg52.h)

the assembler reports the following error message:

A51 FATAL ERROR -
  FILE:       REG51.H
  ERROR:      CAN'T OPEN FILE
A51 TERMINATED.

ANSWER

This problem may be caused by using the macro programming language (MPL) in your assembly modules.

To correctly include a C header file in an assembly program, you must use the C style include statement. For example:

#include "reg52.h"

When you use the C-style include statement, the header file is located and included.

The Keil A51 Assembler automatically includes the header file reg51.h. To stop the assembler from automaticlly including this file, go to:

Project -> 'Options for Target' -> the 'A51' tab -> and uncheck 'Define 8051 SFR Names'.

MORE INFORMATION

• Refer to NOMOD51 in the Ax51 User's Guide.

SEE ALSO

• A51: ERROR 8 (ATTEMPT TO DEFINE AN ALREADY DEFINED LABEL)

Last Reviewed: Friday, July 15, 2005