nes-proj/cpu/rl78/sys/clock.c

127 lines
3.6 KiB
C
Raw Normal View History

/*
* Copyright (c) 2014, Analog Devices, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \author Ian Martin <martini@redwirellc.com>
*/
#include <time.h>
#include "contiki.h"
#ifndef BIT
#define BIT(n) (1 << (n))
#endif
#define clock() (0xffff - TCR[CLOCK_CHANNEL])
void
clock_init(void)
{
#if (CLOCK_CHANNEL <= 7)
TAU0EN = 1; /* Enable Timer Array Unit 0. */
TT0 = 0x00ff; /* Stop the Timer Array Unit. */
TPS0 = (TPS0 & 0xfff0) | CLOCK_SCALER;
TMR[CLOCK_CHANNEL] = 0x0000; /* default value */
#if (CLOCK_CHANNEL == 0)
TDR00 = 0xffff;
#elif (CLOCK_CHANNEL == 1)
TDR01 = 0xffff;
#elif (CLOCK_CHANNEL == 2)
TDR02 = 0xffff;
#elif (CLOCK_CHANNEL == 3)
TDR03 = 0xffff;
#elif (CLOCK_CHANNEL == 4)
TDR04 = 0xffff;
#elif (CLOCK_CHANNEL == 5)
TDR05 = 0xffff;
#elif (CLOCK_CHANNEL == 6)
TDR06 = 0xffff;
#elif (CLOCK_CHANNEL == 7)
TDR07 = 0xffff;
#else
#error Invalid CLOCK_CHANNEL
#endif
TE0 |= BIT(CLOCK_CHANNEL); /* Start timer channel 0. */
TS0 |= BIT(CLOCK_CHANNEL); /* Start counting. */
#else
TAU1EN = 1; /* Enable Timer Array Unit 1. */
TT1 = 0x00ff; /* Stop the Timer Array Unit. */
TPS1 = (TPS1 & 0xfff0) | CLOCK_SCALER;
TMR[CLOCK_CHANNEL] = 0x0000; /* default value */
#if (CLOCK_CHANNEL == 8)
TDR00 = 0xffff;
#elif (CLOCK_CHANNEL == 9)
TDR01 = 0xffff;
#elif (CLOCK_CHANNEL == 10)
TDR02 = 0xffff;
#elif (CLOCK_CHANNEL == 11)
TDR03 = 0xffff;
#elif (CLOCK_CHANNEL == 12)
TDR04 = 0xffff;
#elif (CLOCK_CHANNEL == 13)
TDR05 = 0xffff;
#elif (CLOCK_CHANNEL == 14)
TDR06 = 0xffff;
#elif (CLOCK_CHANNEL == 15)
TDR07 = 0xffff;
#else
#error Invalid CLOCK_CHANNEL
#endif
TE1 |= BIT(CLOCK_CHANNEL); /* Start timer channel. */
TS1 |= BIT(CLOCK_CHANNEL); /* Start counting. */
#endif
}
/*---------------------------------------------------------------------------*/
clock_time_t
clock_time(void)
{
return clock();
}
/*---------------------------------------------------------------------------*/
unsigned long
clock_seconds(void)
{
return clock() / CLOCK_CONF_SECOND;
}
/*---------------------------------------------------------------------------*/
void
clock_wait(clock_time_t t)
{
clock_time_t t0;
t0 = clock();
while(clock() - t0 < t) ;
}