plat_clock.h

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//  This file is part of MANTIS OS, Operating System for Nymph.
//  See http://mantis.cs.colorado.edu/
//
//  Copyright (C) 2003 University of Colorado, Boulder
//
//  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
//  (See http://www.gnu.org/copyleft/gpl.html)
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
//  USA, or send email to [e-mail].

/** @file plat_clock.h
 * @brief A few defines for clock speeds, used for timing.
 *
 * 
 */
#ifndef __PLAT_CLOCK_H__
#define __PLAT_CLOCK_H__

/** @file avr/include/plat_clock.h
 * @brief Defines for clock speeds specific to the AVR architecture
 *
 */

#ifdef CLOCK_SPEED_7_37
//a few defines which make calculations easier....
#define CLOCK_SPEED      (uint32_t)7372800
#endif

#ifdef CLOCK_SPEED_3_68
#define CLOCK_SPEED      (uint32_t)3686400
#endif

#ifdef CLOCK_SPEED_4_0
#define CLOCK_SPEED      (uint32_t)4000000
#endif

#define CLOCK_SPEED_0    CLOCK_SPEED //no prescaling
#define CLOCK_SPEED_8    (CLOCK_SPEED /    (uint32_t)8)
#define CLOCK_SPEED_32   (CLOCK_SPEED /   (uint32_t)32)
#define CLOCK_SPEED_64   (CLOCK_SPEED /   (uint32_t)64)
#define CLOCK_SPEED_128  (CLOCK_SPEED /  (uint32_t)128)
#define CLOCK_SPEED_256  (CLOCK_SPEED /  (uint32_t)256)
#define CLOCK_SPEED_1024 (CLOCK_SPEED /  (uint32_t)1024)

#define EXT_CLOCK      32768
#define EXT_CLOCK_0    EXT_CLOCK //no prescaling
#define EXT_CLOCK_8    (EXT_CLOCK /    8)
#define EXT_CLOCK_32   (EXT_CLOCK /   32)
#define EXT_CLOCK_64   (EXT_CLOCK /   64)
#define EXT_CLOCK_128  (EXT_CLOCK /  128)
#define EXT_CLOCK_256  (EXT_CLOCK /  256)
#define EXT_CLOCK_1024 (EXT_CLOCK / 1024)

#ifdef CLOCK_SPEED_7_37
#define TIMESLICE_20_MS 144 // value of OCR at 1024 prescaler for 20ms timeslice
//#define TIMESLICE_20_MS 216 // 30 ms
//#define TIMESLICE_20_MS 72 // 10 ms
//#define TIMESLICE_20_MS 288 // 40 ms
//#define TIMESLICE_20_MS 360 // 50 ms
#else
#  ifdef CLOCK_SPEED_3_68
#define TIMESLICE_20_MS 72
#  else
#  ifdef CLOCK_SPEED_4_0
#define TIMESLICE_20_MS 80
#  else
#     error "Timeslice not defined for clock. (msched.c)"
#  endif
#endif
#endif

#endif