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

Logical operators, how can i make a program with !(not) operator

how can i make a program with !(not) operator

Car rental project, I need a project on car rental system using c programmi...

I need a project on car rental system using c programming only of college level

Make c++ program that help health visitor statistics, Pupils' heights The ...

Pupils' heights The health visitor at a school is going to measure the heights of all pupils. For each class she makes a statistics giving the number of pupils of each height and

Is it possible to pass an entire structure to functions, Is it possible to ...

Is it possible to pass an entire structure to functions? Yes, it's possible to pass an entire structure to a function in a call by method style. Some programmers prefer to decl

What is some instance of operator overloading?, A: Here are a few of the ma...

A: Here are a few of the many instance of operator overloading: myString + yourString may concatenate two std::string objects myDate++ may increment a Date object a * b may m

Explain multidimensional arrays, Multidimensional Arrays - Every dimens...

Multidimensional Arrays - Every dimension is specified in separate brackets e.g. int arr[4][3]; This is a two-dimensional array with 4 as row dimension and 3 as

Quick Homework, Write three functions in C or C++: one that declares a larg...

Write three functions in C or C++: one that declares a large array statically, one that declares the same large array on the stack, and one that creates the same large array from t

Develop a windows application to show computer hardware, - But with less fe...

- But with less features and more user-friendly (particularly for non-tech savvy users). - Software needed having a left menu with links (no pictures required) for every hardwar

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