ECE473 Lab1:

Purpose: 
  *Set up Linux development environment 
  *See if your AVR tools are working
  *Get acquainted with AVR-GCC tools.
  *Confirm your XMega board is working.
  *Review C programming/compiling.
  *Get acquainted with using a Makefile. 

Task:
  *Install either VMWare or VirtualBox VMs on your laptop.
  *Install Ubuntu onto your VM
  *Remove the modemmanager daemon to prevent conflicts between the bootloader and 
   system software: sudo apt purge modemmanager
  *Install the AVR tools. The AVR tools install directions are at: 
   http://web.engr.oregonstate.edu/~traylor/ece473/webpages/ubuntu_install.html
  *Attach the xmega473 board's programming interface to your PC's USB port.
  *Download lab1.c and Makefile with "wget" into a working directory. 
    wget http://web.engr.oregonstate.edu/~traylor/ece473/x_labs/22_labs/lab1/lab1.c
    wget http://web.engr.oregonstate.edu/~traylor/ece473/x_labs/22_labs/lab1/Makefile  
   Makefile contains the instructions to properly compile, link and program your board.
  *Compile lab1.c by typing "make all". If the compiler is working, you should
   see no errors and a number of files will be created, especially the file to 
   program the board with: lab1.hex
  *Program the xmega473 board with the command "make program". The argument "program"
   directs make to automatically invoke avrdude with the given parameters. 
  *Connect an LED to port A bit 5 and ground using a 820 ohm resistor.
  *See that the original code works. The LED should be blinking slowly. Alter the code
   so that the blinking is much faster, maybe 2-3 per second. You can change the code
   with vim and recompile without leaving the editor as vim understands what a make file
   is.

What to show for your work:
  *At your your next lab time show that you have correctly modified the code by 
   demonstration. This is done in person.
  *Draw a schematic diagram of the circuit you have created. 
  *Show by analysis what the current is through the LED.
  *Submit your modified lab1.c via COE TEACH.  

Grading
  -code functioning mostly right       75%
  -schematic of LED circuit            10%
  -analysis of LED current             15%
  -lab weighting = 0.05