plat_clock.h

MANTIS是由科罗拉多大学开发的传感器网络嵌入式操作系统。 这是mantis的0.9.5版本的源码。

//  This file is part of MANTIS OS, Operating System
//  See http://mantis.cs.colorado.edu/
//
//  Copyright (C) 2003,2004,2005 University of Colorado, Boulder
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the mos license (see file LICENSE)

/** @file msp430/include/plat_clock.h
 * @brief clock speed macros, as well as precalculated data for
 * uart baud rate timing
 * @author John Ledbetter
 */

#ifndef __PLAT_CLOCK_H__
#define __PLAT_CLOCK_H__

#if   defined(CLOCK_SPEED_2_0)
#define CLOCK_SPEED      (uint32_t)2000000

#define UBR0_INIT  0x22
#define UBR1_INIT  0x00
#define UMCTL_INIT 0xDD

#elif defined(CLOCK_SPEED_3_68)
#define CLOCK_SPEED      (uint32_t)3686400

#define UBR0_INIT  0x40
#define UBR1_INIT  0x00
#define UMCTL_INIT 0x00

#elif defined(CLOCK_SPEED_4_0)
#define CLOCK_SPEED      (uint32_t)4000000

#define UBR0_INIT  0x45
#define UBR1_INIT  0x00
#define UMCTL_INIT 0xAA

#elif defined(CLOCK_SPEED_4_37)
#define CLOCK_SPEED     (uint32_t)4377600

#define UBR0_INIT  0x4C
#define UBR1_INIT  0x00
#define UMCTL_INIT 0x00

#else
#error Clock Speed Not Defined
#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)

#endif