Dynacube: kpit.c Source File

00001 /***************************************************************************
00002                           kpit.c  -  description
00003                              -------------------
00004     begin                : Sat Jan 2 2004
00005     copyright            : (C) 2003 by Dynacube Team
00006     email                : mdshah82@yahoo.com
00007  ***************************************************************************/
00008 
00009 /***************************************************************************
00010  *                                                                         *
00011  *   This program is free software; you can redistribute it and/or modify  *
00012  *   it under the terms of the GNU General Public License as published by  *
00013  *   the Free Software Foundation; either version 2 of the License, or     *
00014  *   (at your option) any later version.                                   *
00015  *                                                                         *
00016  ***************************************************************************/
00017 
00018 #include "dev/core/kpit.h"
00019 #include "common/ktypes.h"
00020 
00021 void pit0_init(DD num_of_times)
00022 {
00023  DW pit_data = 1; //65536
00024 
00025  if(num_of_times > 0)
00026  {
00027   pit_data = (PIT_FREQ/num_of_times);
00028  }
00029 
00030  outb(PIT_MCR_PORT, PIT_COUNTER_0|RW_LSB_MSB|MODE_3|BINARY);
00031  asm("jmp .+2");
00032  outb(PIT_PORT_0, pit_data & 0xFF);
00033  asm("jmp .+2"); 
00034  outb(PIT_PORT_0, (pit_data>>8) & 0xFF);
00035  
00036  printf("\nPIT 0 Initialized @ %d Hz",num_of_times); 
00037 }