Psudo code for interrupt handler , C/C++ Programming

Assignment Help:

The rPeANUt simulator provides buffering of the characters that are typed into the terminal. However, this would generally not be the case so if the program did not consume a character before the next one is typed then a character may be lost. So in this next part of the lab you are required to write an interrupt handler for the IO terminal that will capture characters as they are typed and place them in a buffer. The read system call would then read them out of this buffer rather than directly from the device. The psudo code for interrupt handler with a single character buffer:

void iohandler () {

   if (buffcount == 0) {

      buff = getchar();  // no need to poll on the status register

      buffcount = 1;

   } else {

      getchar(); // no room in the buffer so we lost a character!!!

   }

   enableInterrupts();

}

void traphandler ()  {

   enableInterruptes();

   if (R0 == 0) { // read system call

      while (buffcount == 0) ;

      R1 = buff;

      buffcount = 0;

   } else if (R0 == 1) { // write system call

      putchar(R1); // just store R1 to memory location 0xfff0

   }

}

char buff;

int buffcount;

void main() {

   buffcount = 0;

   enableIOterminalInterrupts();  // involves writing to the control register of the IO terminal device.

   char c;

   while (1) {

      c = read();

      write(c);

   }

}

 


Related Discussions:- Psudo code for interrupt handler

Explain redirection in c++?, Question 1 . Write a brief note on Aggregation...

Question 1 . Write a brief note on Aggregation Question 2 . Discuss briefly on constructors Question 3 . What are the important advantages of Inheritance? Question 4 .

Programming, pseudocode for gregorian calendar

pseudocode for gregorian calendar

Miss, Depreciation to a salvage value of 0. For tax purposes an item m...

Depreciation to a salvage value of 0. For tax purposes an item may be depreciated over a period of several years, n. With the straight line method of depreciati

I want skype recorder application, I want Skype Recorder Application + Setu...

I want Skype Recorder Application + Setup + Sourcecode + NICE UI Project Description: i want an application built which will allow user to record skype audio or video calls

How virtual functions can be implemented in c++?, Normal 0 fals...

Normal 0 false false false EN-US X-NONE X-NONE

Write a program for coupon redemption, The video game machines at your loca...

The video game machines at your local arcade output coupons depending on how well you played the game, you can redeem 10 coupons for a candy bar, 6 coupons for .a medium soft drink

AREAUNDERCURVE, Write a program to find the area under the curve y = f(x) b...

Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve betw

C program to show overloading of matrix operator, C program to show overloa...

C program to show overloading of matrix operator: Write a program for matrix operator overloading. class matrix{                   private :                 int x[

Decodethecode.h, decodes the sending smuggler string from the number format...

decodes the sending smuggler string from the number format into plain text

Arrays, #questi An array of n numbers is given, where n is an even number. ...

#questi An array of n numbers is given, where n is an even number. The maximum as well as minimum of these given numbers need to be determined. Which of the following is true about

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