µVISION DEBUGGER: BREAKPOINTS IN MEMORY REGIONS

Information in this article applies to:

• µVision Version 2.10 or higher

QUESTION

How do I define a breakpoint that stops program execution whenever my program writes to XDATA memory in the area X:0x1000-X:0x1FFF?

ANSWER

There are two good solutions to this kind of breakpoint.

1. You can specify address ranges for access breakpoints in the Debug - Breakpoints... dialog. You can define a breakpoint that stops when your program writes to the range X:0x1000-X:0x1FFF with the following inputs:

   Expression: X:0x668
   Count: 1
   Command:
   Access: Write, Size=4096 Bytes
   

2. You may use the MAP command to specify that a memory range is unavailable for access. The µVision simulator tracks access rights for every memory location. You may define the memory area X:0x1000-X:0x1FFF as READ-ONLY using the following command:

   MAP  X:0x1000, X:0x1FFF READ
   

   Whenever your program writes to this memory area, the debugger halts and displays the following message:

   *** error 65: access violation at X:0xYYYY : no 'write' permission
   

MORE INFORMATION

• Getting Started with µVision2 User's Guide, Chapter 5, Breakpoints

SEE ALSO

• µVision DEBUGGER: ACCESS BREAKPOINTS ON ABSOLUTE MEMORY WRIT
• µVision DEBUGGER: SETTING BREAKPOINTS ON IDATA MEMORY

Last Reviewed: Saturday, July 09, 2005