64 lines
2.8 KiB
C
64 lines
2.8 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Header file for the MSP430-specific rtimer code
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#ifndef RTIMER_ARCH_H_
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#define RTIMER_ARCH_H_
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#include "sys/rtimer.h"
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#define RTIMER_ARCH_SECOND (4096U*8)
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/* Do the math in 32bits to save precision.
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* Round to nearest integer rather than truncate. */
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#define US_TO_RTIMERTICKS(US) ((US) >= 0 ? \
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(((int32_t)(US) * (RTIMER_ARCH_SECOND) + 500000) / 1000000L) : \
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((int32_t)(US) * (RTIMER_ARCH_SECOND) - 500000) / 1000000L)
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#define RTIMERTICKS_TO_US(T) ((T) >= 0 ? \
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(((int32_t)(T) * 1000000L + ((RTIMER_ARCH_SECOND) / 2)) / (RTIMER_ARCH_SECOND)) : \
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((int32_t)(T) * 1000000L - ((RTIMER_ARCH_SECOND) / 2)) / (RTIMER_ARCH_SECOND))
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/* A 64-bit version because the 32-bit one cannot handle T >= 4295 ticks.
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Intended only for positive values of T. */
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#define RTIMERTICKS_TO_US_64(T) ((uint32_t)(((uint64_t)(T) * 1000000 + ((RTIMER_ARCH_SECOND) / 2)) / (RTIMER_ARCH_SECOND)))
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rtimer_clock_t rtimer_arch_now(void);
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#endif /* RTIMER_ARCH_H_ */
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