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

Define four facilities provided by c language preprocessor, Define Four Fac...

Define Four Facilities Provided by C Language Preprocessor? The C language preprocessor provides four separate facilities that you can use as you see fit:   Inclusion

How, how to program?

how to program?

Functions, Define  F u n c t i o n?  T h e r e a r e t...

Define  F u n c t i o n?  T h e r e a r e t w o t y p e s o f f u n ct i o n b u i l t - i n f un ct i o n s a n d u

Declaring Integer variables with an example, How do you declare an integer ...

How do you declare an integer variable? Explain with an example.

What are the two steps that happen while i say delete p?, A: N delete p is ...

A: N delete p is a two-step procedure: it calls the destructor, and then releases the memory. The code developed for delete p is functionally similar to this (supposing p is of typ

In p = new fred(), Q: In p = new Fred(), does the Fred memory "leak" if  Fr...

Q: In p = new Fred(), does the Fred memory "leak" if  Fred constructor throws an exception? A: No.         If an exception take place during the Fred constructor of p = new F

Programming an odds betting website, Programming an odds betting website ...

Programming an odds betting website Project Description: We want someone to program a odds betting website, Require someone with experience and skills! Skills required are

C++ programming, I need help programing this... In this exercise, you will ...

I need help programing this... In this exercise, you will create a program for the sales manager at Computer Haven, a small business that offers motivational seminars to local comp

Serial programming, Hi I''m trying to connect to CISCO router using termios...

Hi I''m trying to connect to CISCO router using termios. So I decided to have two threads one for reading data and the other one for writing data. The problem is that I have to add

Program for queue and vector, #include #include #include usi...

#include #include #include using namespace std; #define MAX 5 #define INF (1 #define DEBUG if(0) #define pii pair #define pb(x) push_back(x) class

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