How can we write an interrupt servicing routine, Computer Engineering

Assignment Help:

Q. How can we write an Interrupt Servicing Routine?

The following are the fundamentalthough rigid sequence of steps:

1. Save the system context (flags,registers etc. which will be modified by the ISR).

2. Disable the interrupts which may cause interference if allowed to take place during this ISR's processing

3. Enable those interrupts which may still be allowed to occur during this ISR processing.

4. Determine cause of the interrupt.

5. Take the suitable action for the interrupt like - receive and store data from serial port, set a flag to specify the completion of the disk sector transfer etc.

6. Restore the system context.

7. Re-enable any interrupt levels which were blocked during this ISR execution.

8. Resume execution of the process which was interrupted on occurrence of the interrupt.

MS-DOS offers you facilities which enable you to install well-behaved interrupt handlers such that they won't interfere with the operating system function or other interrupt handlers. These functions are:

1676_How can we write an Interrupt Servicing Routine.png

Related Discussions:- How can we write an interrupt servicing routine

Creating a contacts application, Creating a contacts application: Firs...

Creating a contacts application: First, a contact is defined as the tuple: firstName, lastName, phoneNumber and email. You will create a class Contact that allows getting a

Data structuer and algorihm, what is list stack queues

what is list stack queues

What are compilers and interpreters, What are compilers and interpreters? ...

What are compilers and interpreters? Compiler and Interpreter: These are two types of language translators. A compiler changes the source program (user-written program) int

Software engineering, What are coupling and cohesion and why are they impor...

What are coupling and cohesion and why are they important concepts in software design?

Number system, Number systems Consider a decimal number: ...

Number systems Consider a decimal number: 7654.32 Short hand for: 7 * 103 + 6*102 + 5* 101 + 4*100 + 3*10 -1 + 2*10 -2 Likewise

Auto increment mode and condition code flags, Described auto increment mode...

Described auto increment mode of addressing? Ans: Effective address of the operand is the contents of a register mention in the instruction. After finishing the accessing t

Communication traffic and message queues, The Communication Traffic gives a...

The Communication Traffic gives a pictorial view of the communication traffic in the interconnection network with respect to the time in progress. The Communication Traffic shows t

How can we use / display table in a screen, How can we use / display table ...

How can we use / display table in a screen? ABAP/4 offers two mechanisms for showing and using table data in a screen. These mechanisms are TABLE CONTROLS and STEP LOOPS.

Manipulate the presentation and attributes interactive list, How can you m...

How can you manipulate the presentation and attributes of interactive lists? ---Scrolling by Interactive Lists. ---Setting the Cursor from within the Program. ---Changing

Explain the disadvantages off-the-shelf, Explain the disadvantages Off-the...

Explain the disadvantages Off-the-shelf - can be over-complex since it tries to cover as many characteristics as possible (for example most users of Word only utilise about

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages