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

Write a c program to input numbes in table format, Write a C program to inp...

Write a C program to input 16 numbers and print them out in a table format of 4 wide by 4 deep. E.g.   4    5    5    7   8    9    10    11   12    13    14    15   16    17

Private member functions, P r i va t e Member Functions: A private...

P r i va t e Member Functions: A private member functions can be called by the members of the same class.  Consider the following example.   c l a ss sample

Objects., what are objects or simply define objects

what are objects or simply define objects

Stand-alone dsp application, You are required to write a stand-alone DSP ap...

You are required to write a stand-alone DSP application in the C programming language. The overall objective of this application is to convert a signal from the time domain to t

PEBBLE MERCHANT, There is a pebble merchant. He sells the pebbles, that are...

There is a pebble merchant. He sells the pebbles, that are used for shining the floor. His main duty is to take the length of the room’s sides. But he sometimes mistakes doing that

Define functions with arguments and return values, Define Functions with ar...

Define Functions with arguments and return values? The earlier category functions receive values from the calling function through arguments but do not send back any value rath

Define multi file program, Define Multi File Program? While writing lar...

Define Multi File Program? While writing large programs we must divide programs up into modules. These would be separate source files and the main() function would be in one fi

There are ''''n'''' ants on a ''''n+1'''' leng n, There are ''''n'''' ants ...

There are ''''n'''' ants on a ''''n+1'''' length rod. The ants are numbered from 1 to n and are initially placed at positions starting from position 1 till position n. They are mov

Priority Queue, Ask question #Minimum 100 words acceptedEducational Objecti...

Ask question #Minimum 100 words acceptedEducational Objectives: After completing this assignment, the student should be able to accomplish the following: Apply generic algorithms i

What is the difference among malloc/free and new/delete?, What is the diffe...

What is the difference among malloc/free and new/delete? A: Malloc/free do not know about destructors and constructors. New & delete create and destroy objects, whereas malloc &

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