Toturial Avr Estudio

AVR Studio Software Tutorial

Sepehr Naimi (BIHE)

2010-06-08

Introduction
This tutorial will teach you how to write, compile, and trace a simple program in AVR Studio. For more information, you can see AVR Studio’s help.

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Downloading and Installing AVR Studio
1. First download AVR Studio. You can download the last version of the AVR Studio IDE from the following web address:http://www.atmel.com/dyn/Products/tools_card.asp?tool_id=2725

Figure 1: Downloading the Last Version of AVR Studio

2. Execute the downloaded setup file. The installation of the software is straight forward, and it can be done by pressing the Next and Install buttons a few times. Now, the AVR Studio IDE is ready to be used.

Opening AVR Studio
3. Open the AVR Studio from the start menu.Figure 2: Running AVR Studio

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Creating a new Project
4. Click on the New Project button.

Figure 3: Welcome window

5. In the left list, when you want to write your code in Assembly you should select Atmel AVR assembler, and when you want to write you code in C, you should choose AVR GCC. As we want to write the first program in assembly, choose Atmel AVR assembler. Then choose a namefor your project (e.g. firstProgram) by typing the name in the text field below the Project name. You can change the location where the files of the project will be saved by clicking on the … button, if you want. Press the Next button.

Figure 4: Making a new project

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6. Choose AVR Simulator from the left list and ATmega32 from the right list and press Finish.

Figure 5: Choosing theChip and Debugger

Writing the source code
7. Now, type the following program:

Figure 6: The first program

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Saving
8. Save the program by pressing Ctrl + S or choosing Save from the File menu

Figure 7: The File menu

Assembling
9. To convert your program to machine language press F7 or select Build from the Build menu or click the build icon in the toolbar.

Figure 8: TheBuild menu and the different ways of building

10. See the Build window. The window shows if your program has syntax error or not. By looking at the window, you can see the amount of memory which is used by your program, as well. 6

Tracing and Debugging
11. Select Start Debugging from the Debug menu. A yellow arrow appears next to the first instruction of the program which shows that the nextinstruction which will be executed.

Figure 9: The Debug menu

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Tracing
12. To execute the next instruction press F11 or select the Step Into from the Debug menu. There are also another tracing tools in the Debug menu, as well: • Step Over: It is executes the next instruction, like Step Into. The only difference between them is that, if the next instruction is a function call, the Stepinto, goes to the function; but Step Over executes the function completely and goes to the next instruction. • Step Out: If you are in a function, Step Out executes the program up to the end of the function. • For more information about the Tracing tools you can see the AVR Studio’s help.

Figure 10: The Different tracing tools

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Watching
See Figure 11. In this part you learn to use thedifferent tools to watch the program.

Figure 11: AVR Studio environment

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Processor: It shows the
contents of the registers which are related to the CPU: general purpose registers (R0 to R31), PC, SP (Stack Pointer), status Register (SREG), X, Y, and Z registers. See Figure 12. Cycle Counter counts the number of machine cycles which have been passed and the Stop Watch represents how muchtime has elapsed. You can use the parameters to measure the execution time of your program. You can reset them as well, by right clicking on them and choosing reset. I/O View: In this window, you can see the value of the different I/O registers. See Figure 13; in the upper box, the related I/O registers are grouped. Click on PORTA and see the values of DDRA, PINA, and PORTA.

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Figure 12:...