i8254.h

来自「Simple Operating Systems （简称SOS）是一个可以运行在」· C头文件 代码 · 共 36 行

/* Copyright (C) 2004  David Decotigny

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA. 
*/
#ifndef _SOS_i8254_H_
#define _SOS_i8254_H_

#include <sos/errno.h>

/**
 * @file i8254.h PC programmable timer
 *
 * Programmable timer routines. See the Intel 82C54 datasheet (on kos
 * website).
 *
 * @see i82C54 datasheet on Kos website.
 */

/** Change timer interrupt (IRQ 0) frequency */
sos_ret_t sos_i8254_set_frequency(unsigned int freq);

#endif /* _SOS_i8254_H_ */