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UNIVERSITY OF CALIFORNIA
College of Engineering Electrical Engineering and Computer Sciences Department EECS 145M: Microcomputer Interfacing Laboratory Spring Midterm #1 (Closed book- equation sheet provided- calculators OK) Wednesday, February 26, 2001 PROBLEM 1 (20 points) How would you use electronic components, a computer with a digital I/O port, and statistical analysis to determine whether racecar drivers or jet fighter pilots have the faster reaction time? List all the steps that you need to accomplish to make a valid determination.
PROBLEM 2 (20 points)
You have designed a camera and computer system for recognizing automobile license plate numbers as cars pass on a highway. You would like to send the numbers to a nearby central computer as soon as possible, but the central computer is frequently busy with other tasks. Therefore, you store each number in local memory until it can be sent and use “data available” and “ready for data” handshaking signals to ensure that all license plate numbers are reliably transferred.
You may assume that each computer has a digital I/O port.
2a (10 points) Draw a block diagram of your system, including both computers and their digital I/O ports. Label data and handshaking lines.
2b (10 points) List the hardware and software steps needed from the passing of a car to the reliable transfer of its license plate number to the central computer.
3b. (20 points) In proper time sequence, list the program and hardware steps necessary for your system to produce the two analog waveforms.
3c. (15 points) Draw a timing diagram for one complete cycle of your system, starting with the analog output voltages corresponding to val_right[i] and val_left[i] and ending with the analog output voltages corresponding to val_right[i+1] and val_left[i+1]. (Note: rather than drawing waveforms, you can just write the value of the different signals as time progresses)
3d. (5 points) What difficulties would you encounter storing and playing 2 hours of stereo music using this system?
