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 the process of using the constructor, Using the Constructor The...

Using the Constructor There are basically three ways of creating and initializing the object. The first way to call the constructor is explicitly as :

Required, requiredrequiredrequiredrequiredrequiredrequiredrequiredrequired

requiredrequiredrequiredrequiredrequiredrequiredrequiredrequired

Queue, write a queue program in c langauge?

write a queue program in c langauge?

Get linux caller id to work with usb modem on ubuntu, Project Description: ...

Project Description: I am seeking someone who can make this modem work with Linux Caller ID on Ubuntu present stable version. Skills required are C Programming, Python

Hwid spoofer for windows 7, HWID Spoofer for Windows 7, 8 x64 Project De...

HWID Spoofer for Windows 7, 8 x64 Project Description: I want a simple program that will spoof my hardware id. I should be able to prepare the id to spoof to in the program a

Addition in a existing c++ unification algorithm, Addition in a existing c+...

Addition in a existing c++ unification algorithm Project Description: I have a existing code for a algorithm and need to add two modules into it, it is a unification algorith

Example., I need the c++ program of class bank accout including balance,rat...

I need the c++ program of class bank accout including balance,rate of interests

Stack, flow chart for push operation in stack

flow chart for push operation in stack

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