2004-05 MODEL PAPER

MCA 3.1.4

EMBEDDED SYSTEMS

Elective II

First Question is Compulsory

Answer any four from the remaining

Answer all parts of any Question at one place.

Time: 3 Hrs.
Max. Marks: 100

1. a) Explain Atomic Operations, give any one atomic instruction for any processor known to you?
b) Distinguish between Microprocessors and Microcontrollers
c) Explain any two schemes for inter task communication.
d) What is watchd og timer in a single board computer? Explain.
e) What are the two rules that an interrupt routine must adhere to in an RTOS environment.

2. a) Suggest a suitable architecture for road traffic lights control at a four -road intersection Give hardware and software requirements.
b) What is data sharing problem in multi tasking environment? Explain with an example

3. a) Explain (i) Round Robin architecture, ii) Preemptive scheduling?
b) What is reentrancy? Give the necessary conditions to make a function reentrant.

4. a) Bring out the subtle differences between real time operating systems and typical (non real time) operating system?
b) Explain the architecture of function queue scheduling, write a C program for implementing the same. Assume suitable data wherever necessary

5. a) What are the constituents of the Embedded software that are required to make the target CPU (single board computer) to run, name them and explain each of them briefly?
b) Explain the following in brief (i) ROM Emulator (ii) In-Circuit –Emulator (iii) Flash memory.

6. What is priority inversion? How this can be solved? Take up a problem of elevator for four floors, identify the number of tasks required, their priorities and their functions in the process of designing a an application software in Real Time.

7. Compare three methods of inter task communication with a suitable example pseudo code using μC/OS RTOS functions. Assume suitable data

8. Write short notes on the following:
a) Interrupt Latency b) Applications of Embedded Systems
c) Hard Real-Time and Soft Real- Time Systems d) Built-Ins on the Microprocessor