# timer.h

Go to the documentation of this file.

    00001 /*                                             -*- mode:C++; fill-column:100 -*-
    00002   timer.h -  LPC2xxx-specific hardware access and configuration routines
    00003   Copyright (C) 2009 The Regents of the University of New Mexico.  All rights reserved.
    00004
    00005   This library is free software; you can redistribute it and/or
    00006   modify it under the terms of the GNU Lesser General Public
    00007   License as published by the Free Software Foundation; either
    00008   version 2.1 of the License, or (at your option) any later version.
    00009
    00010   This library is distributed in the hope that it will be useful,
    00011   but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013   Lesser General Public License for more details.
    00014
    00015   You should have received a copy of the GNU General Public License
    00016   along with this library; if not, write to the Free Software
    00017   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
    00018   USA
    00019
    00020   $Id$
    00021 */
    00022
    00029 #ifndef __TIMER_H
    00030 #define __TIMER_H
    00031
    00032 #include "SFBConstants.h"
    00033
    00035 #define CCLK_72MHZ (72000000)
    00036 #define CCLK_60MHZ (60000000)
    00037
    00038 #define CCLK CCLK_72MHZ
    00039
    00040 /*
    00041  * For SFB@60MHz: CCLK = 60Mhz, PCLK = 1/4 CCLK, so Fpclk = 15MHz, Fpclk/15000==1KHz.
    00042  * so 1ms = Fpclk/15000, less one for the extra cycle in the timer
    00043  *
    00044  * For SFB@72MHz: CCLK = 72Mhz, PCLK = 1/4 CCLK, so Fpclk = 18MHz, Fpclk/18000==1KHz.
    00045  * so 1ms = Fpclk/18000, less one for the extra cycle in the timer
    00046  *
    00047  * For SFB@72MHz: CCLK = 72Mhz, PCLK = 1/4 CCLK, so Fpclk = 18MHz, Fpclk/18000==1KHz.
    00048  * so 500us = Fpclk/9000, less one for the extra cycle in the timer
    00049  * so 250us = Fpclk/4500, less one for the extra cycle in the timer
    00050  *
    00051  */
    00053 #define TIME_INTERVAL_1KHZ_AT_60MHZ (15000-1)
    00054
    00055 #define TIME_INTERVAL_1KHZ_AT_72MHZ (18000-1)
    00056 #define TIME_INTERVAL_2KHZ_AT_72MHZ (9000-1)
    00057 #define TIME_INTERVAL_3KHZ_AT_72MHZ (6000-1)
    00058 #define TIME_INTERVAL_4KHZ_AT_72MHZ (4500-1)
    00059
    00060 extern u32 initTimer0();
    00061 extern void enable_timer0();
    00062 extern void disable_timer0();
    00063 extern void reset_timer0();
    00066 #include "lpc/LPC23xx.h"
    00067
    00074 #define micros() ((volatile const u32) (T0TC))
    00075
    00078 #define millis() ((volatile const u32) (timer_1msec_counter))
    00079 extern uv32 timer_1msec_counter;
    00080
    00084 extern u64 microseconds();
    00085
    00089 extern u32 milliseconds();
    00090
    00093 extern u32 seconds();
    00096 #endif /* end __TIMER_H */
    00097 /*****************************************************************************
    00098 **                            End Of File
    00099 ******************************************************************************/