Birla Institute of Technology (BIT Mesra) 2006 SOFTWARE FOR EMBEDDED SYSTEMS - Question Paper

Birla Institute of Technology & Science, Pilani

Distance Learning Programmes Division

Second Semester 2006-2007



Mid-Semester Test

(EC-1 Regular)



Course No. : IS ZC424

Course Title : SOFTWARE FOR EMBEDDED SYSTEMS

No. of Pages = 2

No. of ques. = two
Nature of examination : Closed Book

Weightage : 40%

Duration : two Hours

Date of examination : 04/02/2007 (FN)

Note:

1. Please follow all the Instructions to Candidates provided on the cover page of the ans book.

2. All parts of a ques. should be answered consecutively. every ans should begin from a fresh page.

3. Mobile phones and computers of any type should not be brought inside the exam hall.

4. Use of any unfair means will outcome in severe disciplinary action.





Q.1. List the essential characteristics of real-time, embedded systems. b) discuss schedulability approaches in RT systems. [5 +10 = 15]



Q.2. obtain and represent the requirements, functional, and dynamic aspects of the subsequent case study example using UML or any other approaches (e.g. DFDs, Structure charts etc):

[25]



Case study: cruise control system (CCS) for an automobile



The CCS has a control lever with 4 switch positions: ACCEL (right), RESUME (left), and OFF (up or down). It also has a neutral position. The needed cruise control functions are:



1. Automatic Cruise Control: the CCS is activated and controlled by a lever at the right-hand side of the steering wheel column. The subsequent functions are activated in the individual switch positions



Accel: Cruising speed is set and memorized. By holding the lever in this position, the car accelerates without using the accelator. After releasing the lever, the achieved speed is maintained and also memorized. The cruising speed control is automatically switched off in any operation when using the footbrake.



OFF(two positions): by moving the control lever either in a downward or upward direction, the cruise control can be switched off in any driving and operating condition.



Resume: the last memorized speed can be resumed by moving the lever to ‘Resume’. The memorized speed is cancelled by switching off the ignition.



Two calibration buttons are available for the maintenance technician to begin and stop measured mile calibration. They are needed to set the value of a calibration constant used in distance and speed measurement.


2. Monitoring functions: The needed vehicle monitoring functions are:

Earning:   Approval pending.