Interrupts - event driven devices, Computer Graphics

Assignment Help:

Interrupts - Event driven devices

Interrupts: An option to polling is the interrupt feature. The device sends an interrupt signal to the processor while an event happens. The processor breaks from its usual execution and executes several special interrupt-handling routine or task.

After complete the task, the control returns to the important program. To handle conditions while more than one event happens, various priorities are allocated to tasks hence higher priorities tasks may interrupt tasks of lower priority.

Some events may arise before the program is prepared for them. While more than one event occurs, the relate information is entered in the event queue. A polling loop can be utilized to check the status of the event queue. The event queue can after that pass input data from the polling task to the main program in the accurate order. The main program takes events off the head of the queue and raises the suitable process. The devices require not be checked frequently for occurrence of events. Such devices can interrupt although the processor being unaware of this.

Two types of light pen interrupts may arise. If the user points that pen at an item upon the screen to choose it, as in figure (a) of Light Pen Application, a selection interrupt arises. If the user is positioning along with the pen, as in figure (b) of Light Pen Application, a pattern termed as tracking pattern in displayed along the pen's tracking interrupts and movement arise when the pen observes the tracking pattern.

Modified versions of the light pen may also be utilized to draw lines, read barcodes or perform transformation operations on things on a tablet or on the screens.

 


Related Discussions:- Interrupts - event driven devices

De casteljeau algorithm - bezier curves, De Casteljeau algorithm: The cont...

De Casteljeau algorithm: The control points P 0 , P 1 , P 2 and P 3 are combined with line segments termed as 'control polygon', even if they are not actually a polygon although

What do you mean by high definition systems -what is dvst, what do you mean...

what do you mean by high definition systems? Define aspect ratio?  What is a refresh buffer? What is the difference between bitmap and pitman frame buffer? Explain the basic oper

Video conferencing and virtual reality, Video Conferencing and Virtual Real...

Video Conferencing and Virtual Reality Virtual reality is a truly fascinating multimedia application. In such, the computer creates an artificial environment using hardware an

Key frame systems, Ask questionkms eey frame syst #Minimum 100 words accept...

Ask questionkms eey frame syst #Minimum 100 words accepted#

Algorithms for basic line segment plotting, Algorithms for Basic Line Segme...

Algorithms for Basic Line Segment Plotting There are two important algorithms for basic line segment plotting-DDA algorithm and Bresenham algorithm.  Both the algorithms use th

Graphics applications, The subsequent are also considered graphics applicat...

The subsequent are also considered graphics applications as: • Paint Programs: Permit you to create rough freehand drawings. The images are saved as bit maps and can simply be

Identify design patterns, Mauri Ltd has just acquired a new stock manageme...

Mauri Ltd has just acquired a new stock management system and the source codes (PhP5) also have been delivered. The coding style is fully object-oriented. The company has been u

Macintosh - hardware for computer animation, Macintosh - Hardware for compu...

Macintosh - Hardware for computer animation It was originally designed to be graphic and desktop publishing machines. Macs did not turn into which widely known till recently, a

Multimedia business, Multimedia Business: Even fundamental office app...

Multimedia Business: Even fundamental office applications as a MS word processing package or a MS Excel spreadsheet tool turns into a powerful tool along with the aid of mult

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd