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rtimer-arch.h
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1/*
2 * Copyright (c) 2007, Swedish Institute of Computer Science.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the Institute nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * This file is part of the Contiki operating system.
30 *
31 */
32
33/**
34 * \file
35 * Header file for the MSP430-specific rtimer code
36 * \author
37 * Adam Dunkels <adam@sics.se>
38 */
39
40#ifndef RTIMER_ARCH_H_
41#define RTIMER_ARCH_H_
42
43#include "sys/rtimer.h"
44
45#define RTIMER_ARCH_SECOND (4096U*8)
46
47/* Do the math in 32bits to save precision.
48 * Round to nearest integer rather than truncate. */
49#define US_TO_RTIMERTICKS(US) ((US) >= 0 ? \
50 (((int32_t)(US) * (RTIMER_ARCH_SECOND) + 500000) / 1000000L) : \
51 ((int32_t)(US) * (RTIMER_ARCH_SECOND) - 500000) / 1000000L)
52
53#define RTIMERTICKS_TO_US(T) ((T) >= 0 ? \
54 (((int32_t)(T) * 1000000L + ((RTIMER_ARCH_SECOND) / 2)) / (RTIMER_ARCH_SECOND)) : \
55 ((int32_t)(T) * 1000000L - ((RTIMER_ARCH_SECOND) / 2)) / (RTIMER_ARCH_SECOND))
56
57/* A 64-bit version because the 32-bit one cannot handle T >= 4295 ticks.
58 Intended only for positive values of T. */
59#define RTIMERTICKS_TO_US_64(T) ((uint32_t)(((uint64_t)(T) * 1000000 + ((RTIMER_ARCH_SECOND) / 2)) / (RTIMER_ARCH_SECOND)))
60
61rtimer_clock_t rtimer_arch_now(void);
62
63#endif /* RTIMER_ARCH_H_ */
Header file for the real-time timer module.