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uCOS Port - Review and Notes
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Complete the port of the uCOS project. Below is a list of the files and 
what needs to be for each.

Interrupt Control
-----------------

bsp/cpu_a.s

* Implement save of CPSR register 
* Implement restore of CPSR register 

Timer
------
bsp/bsp.c

* Intialize the timer

  * Set VIC registers correctly
  * Use CP100 Timer project as guide

* Handle timer interrupt

  * Reset timer
  * Info OS that tick occured

Ticks
-----
inc/os_cfg.h

* Define number of ticks per second

Defines
-------
inc/app_cfg.h

* Add any needed includes
* Define default stack sizes for tasks in OS_STK units
* Define task priorities

inc/cpu.h

* Define size of a stack entry
* Define size of the CPSR

Startup
-------
app/main.c

* Allocate a stack for the startup task
* Add system initialization code to main()

Application
-----------
app/tasks.c

* Implement StartupTask()
* Implement several worker tasks