µVISION DEBUGGER: FILE FORMAT FOR 'COVERAGE SAVE'

Information in this article applies to:

• µVision Version 2 and Later for 8051 devices

QUESTION

I have a hardware tool that collects code coverage information on my 8051 based target system. Since the µVision simulator is able to load code coverage information from a file, I would like to use µVision to view this information in high-level (source) mode. What file format does µVision use to store code coverage information?

ANSWER

It is a binary file with a some additional header information:

• 4 byte integer that specifies the code page. It is:
  00:00:00:00 for standard applications and for the common area of code-banked applications.
  80:00:00:00 for code bank 0
  81:00:00:00 for code bank 1 and so on.
• 65536 (0x10000) 16-bit integers where each value represents the attribute for a single 8051 code byte. The bits have the following meaning:
• • Bit 0: There is an 8051 instruction at this address.
  • Bit 4: 8051 instruction has been executed at least once. This attribute is only set on the first byte of an instruction.
  • Bit 14: 8051 jump instruction has been taken
  • All other bits are not significant for this purpose.
• 8 bytes with a value of 0 mark the end of a 64K code segment.

SEE ALSO

• Refer to COVERAGE in the µVision User's Guide.
• µVision DEBUGGER: WHAT DO THE CODE COVERAGE COLORS MEAN?
• µVision DEBUGGER: SAVE / RESTORE CODE COVERAGE INFORMATION

Last Reviewed: Thursday, November 30, 2006