AVR Studio Debugging Quick Start

The following debugging methods are from AVR Studio 4. I have tried to translate them for accurate understanding. Please correct me if there are any inaccuracies:

Auto Step Automatic execution

It can repeat the instructions. If the current mode is source (i.e. C language window display mode), one instruction will be executed. If the disassembly mode is processed (i.e. display as assembly instruction mode), one assembly instruction will be executed. After each instruction is executed, all the information in the window will be updated. The

execution delay of each instruction can be selected in debug option.

When the user presses stop or there is a breakpoint, the automatic execution will stop.

Step Into Single-step execution:

only one instruction is executed. If the current mode is source (i.e. C language window display mode), one instruction will be executed. If the disassembly mode is processed (i.e. display as assembly instruction mode), one assembly instruction will be executed.

After each instruction is executed, all the information in the window will be updated.

Step Over

Only one instruction is executed. If this instruction contains or calls a function or subroutine, this function or subroutine will also be executed. If there is a breakpoint, the execution will stop. After the execution is completed, the information will be displayed in the window.

Step Out

Step Out will execute until the current program ends. If there is a breakpoint, the execution will stop. When the step out action is executed at the beginning of the program, the program will execute until the end, unless there is a breakpoint or the user manually interrupts it.

After the run is completed, all the information will be displayed in the window.

Run to Cursor Execute to the cursor position

Execute to the position where the cursor is placed in the source window (i.e., the C language window). Even if there is a breakpoint, it will not be interrupted. If the position where the cursor is located cannot be executed, the program will continue to execute until the user manually interrupts it. After the execution is completed, all the information will be

displayed in the window. Because this method depends on the position of the cursor, it can only be used in the source, i.e., C language window mode.


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QuickWatch: When the program is simulated, the values ​​of some ports or variables are immediately displayed.

Operation method: For example, we want to see the value of i in operation. Select i in the C source code, a pop-up menu will pop up, select: Add to Watch: i (or you can select i and press the quickwatch button marked with a red box in the figure below).


Use a similar method to add PORTB to watch... Execute AutoStep or Step Into to display the values ​​of these two variables while the program is running!