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

Structures, how to define the structures

how to define the structures

When should i use references, A: Use references when you can use, and use p...

A: Use references when you can use, and use pointers when you have to. References are generally preferred over pointers whenever you don't require "reseating". Usually this mean

Flow chart, given number is prime or not

given number is prime or not

Program to list the cities and their states, The program will ask the user ...

The program will ask the user to enter: '1' to List the cities(and their state abbrev)  from largest to smallest (by their population) with their population '2'  to List the

Explain private derivation, Private derivation If no specific derivatio...

Private derivation If no specific derivation is listed, then a private derivation is supposed. If a new class is derived privately from its parent class, then: The priva

Compute the net pay for employees - c program, Write a C# program to comput...

Write a C# program to compute the Net Pay for employees. The program is to have a Main method and two user-defined methods. The Main method is to input the employee's name (string)

Algorithm and flowchart, an algorithm and flowchart of finding the product ...

an algorithm and flowchart of finding the product of any two numbers

Decode the code, Smugglers are becoming very smart day by day. Now they hav...

Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, they are send

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