EE 476: Laboratory 1

Introduction to the lab hardware/software.


This assignment introduces you to the software and hardware development tools you will use this semester to work with the Atmel AT90-series microcontroller chips.


The hardware you will be using to support the AT90-series is the Flash MCU evaluation board, a small board providing:

A small power supply provides power to the development board.


Software you will use consists of:


  1. Make sure the evaluation board is connected to power and to the PC as specified in the evaluation board description. Turn on the power supply with the switch on the board. An LED in the middle of the board should cycle from red to yellow to green. For this first lab, there should be jumpers on the PortB to the LED header and on PortD to the switch header. Ask your instructor for help if these are not installed.

  2. Make a subdirectory for your group in the My Documents folder. Name it with your netid. Be sure to put all your files there and to back up daily!.

  3. There should be a shortcut to Codevision C on the desktop.

  4. After you define a new project, you can add a C source file and edit it. For now, save this code (from the Program Organization page) into your directory and add it to the project you just defined.

  5. Click on the compile icon. A message window will open to tell you if there are errors in the code. If there are errors, The open the listing file to see where they are. If the compile is successful, you should be able to download the program to the STK500 board.


All timing must be done with interrupt-driven hardware timers and not with software wait-loops. Each of the following modifications should be saved separately for demonstration. All programs must be in C.

  1. Modify the program you were given to count up at one count per second only when switch0 is pressed and held. The LED displayed count (0 to 255) should stop counting and hold its value when the switch is not pressed.

  2. Modify the program to cause the LEDs 0-6 to count up in binary from 0x00 to 0x07F and back down to 0x00 again, and repeat indefinitely. The count rate should be 10 per second. Also, LED 7 should blink at a rate of one per second.

Be prepared to demo the programs you wrote to your TA in lab.

Your written lab report should include:

Copyright Cornell University Jan 2002