Homework Assignment #4 – MIPS Assembly Programming
CDA 3100, Computer Organization I, Spring 2008
Due: Midnight, February 29, 2008
Submission: Email the code to the TA and the instructor.
The purpose of this assignment is to practice the implementation of a typical embedded
controller.
In this assignment, you are asked to implement a simple TV controller. It accepts
simple commands like vol+/-, channel +/-, channel digit input (0-9), sleep timer,
and power on/off.
•Power key: ‘p’ on the keyboard
•Channel +/- : ‘u’ as + and ‘d’ as –
•Vol +/- : ‘l’ as + and ‘k’ as –
•Digit input: 0-9
•Sleep timer: ‘s’
The specifications are:
1. When there is no input, roughly every 3 seconds, print out the current state
of the TV, including: Current second, Power On (of Off), Channel (current
channel watching), volume (current volume), Sleep timer remaining. For
example, “100 sec -- Power On! Channel 10, Volume 30, sleep timer 120.” If
power is off, only output “100 sec -- Power off!”
2. Power key. When power key is pressed, if the power is currently off, turn on
the TV immediately by printing “Power On!” When power key is pressed, if
the power is currently on, turn off the TV immediately by printing “Power
Off!”
3. Channel +/-.Once pressed, change the current watching channel accordingly
within a range of 0-99 and print out, for example, “Channel 30.”
4. Volume +/-.Once pressed, change the volume accordingly within a range of
0-99 and print out, for example, “Volume 30.”
