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Debug for 8- and 16-Bit Devices
? To record a PC location, click on or highlight a line of code and then right click to
select “Insert Language Line Trace” from the pop-up menu, where Language can
be either C or ASM. This causes the following macro line to be inserted above the
selected line:
__TRACE(id);
where id is a line trace number auto-generated during the build. For more
information, see Section 7.3.10 “More on Trace/Log ID Numbers” .
Note:
Inserting a macro into code may modify the logic flow of the program.
Please be sure that braces are present where necessary.
? The recording of a variable value is performed much in the same way. First high-
light the variable name or expression and then right click to select “Log Selected
Language Value” from the pop-up menu, where Language can be either C or
ASM. This causes the following macro line to be inserted above the line
containing the variable:
__LOG(id ,selected variable );
where id is a log number auto-generated during build and selected variable
is the highlighted variable. For more information, see Section 7.3.10 “More on
Trace/Log ID Numbers” .
? To remove a trace point, simply highlight and then delete the Trace/Log macro.
7.3.6
Running Trace
1. On the Project Manager toolbar, select “Debug” from the Build Configuration
drop-down list.
2. Rebuild the project ( Project>Build All ).
3. After rebuilding, if there are trace macros in code, a Warning dialog will ask, “File
has been modified. Do you want to reload?”. Click Yes . When you examine your
code, you will find that all id s have been replaced with unique numbers.
Note:
To disable this warning and automatically reload, select
Configure>Settings , Other tab, and check “Automatically reload files
that were modified outside of the IDE”. Then click OK .
4. Reprogram the device ( Debugger>Program ).
5. Run the program and then halt, or set a breakpoint to halt.
6. Select View>Trace to view the trace data ( Section 11.3.11 “Trace Window” ) or
right click and in the Trace window and select “Reload”. For each __TRACE
macro, the line of code following the macro will appear in the trace window each
time it is passed. For each __LOG macro, the selected variable in the line of code
following the macro will appear in the trace window each time it is passed.
Note:
To trace multiple lines of code or variables, you must place a macro
before each line/variable that you wish to trace.
Repeat these steps each time you change a trace point.
7.3.7
Tracing Tips
When using __TRACE and __LOG macros in your code, consider the following:
? Focus on one area of an application and place __TRACE and __LOG macros so
that they form a “flow” in the Trace window. That way, you can follow the execution
flow and debug the application based on missing/incorrect trace points or an
abrupt end to the trace flow.
? Use __TRACE and __LOG macros with conditional statements in your code to aid
in debugging. Example: When a variable reaches a certain value, start logging it.
? 2008 Microchip Technology Inc.
DS51616B-page 71
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