Contiki-NG
rtimer-arch.h
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1 /*
2  * Copyright (c) 2018, Texas Instruments Incorporated - http://www.ti.com/
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 copyright holder nor the names of its
14  * contributors may be used to endorse or promote products derived
15  * from this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
20  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
21  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
28  * OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 /**
31  * \addtogroup cc13xx-cc26xx-cpu
32  * @{
33  *
34  * \defgroup cc13xx-cc26xx-rtimer The CC13xx/CC26xx rtimer
35  *
36  * Implementation of the rtimer module for CC13xx/CC26xx. This header
37  * is included by os/sys/rtimer.h.
38  *
39  * RTIMER_ARCH_SECOND is defined in cc13xx-cc26xx-def.h.
40  * @{
41  *
42  * \file
43  * Header file of the rtimer driver for CC13xx/CC26xx.
44  * \author
45  * Edvard Pettersen <e.pettersen@ti.com>
46  */
47 /*---------------------------------------------------------------------------*/
48 #ifndef RTIMER_ARCH_H_
49 #define RTIMER_ARCH_H_
50 /*---------------------------------------------------------------------------*/
51 #include "contiki.h"
52 /*---------------------------------------------------------------------------*/
53 rtimer_clock_t rtimer_arch_now(void);
54 /*---------------------------------------------------------------------------*/
55 /*
56  * HW oscillator frequency is 32 kHz, not 64 kHz. And, RTIMER_NOW() never
57  * returns an odd value; US_TO_RTIMERTICKS always rounds to the nearest
58  * even number.
59  */
60 #define US_TO_RTIMERTICKS(us) ( \
61  (((us) >= 0) \
62  ? (((int32_t)(us) * (RTIMER_ARCH_SECOND / 2) + 500000) / 1000000L) \
63  : (((int32_t)(us) * (RTIMER_ARCH_SECOND / 2) - 500000) / 1000000L) \
64  ) * 2)
65 
66 #define RTIMERTICKS_TO_US(rt) ( \
67  ((rt) >= 0) \
68  ? (((int32_t)(rt) * 1000000L + (RTIMER_ARCH_SECOND / 2)) / RTIMER_ARCH_SECOND) \
69  : (((int32_t)(rt) * 1000000L - (RTIMER_ARCH_SECOND / 2)) / RTIMER_ARCH_SECOND) \
70  )
71 
72 /*
73  * A 64-bit version because the 32-bit one cannot handle T >= 4295 ticks.
74  * Intended only for positive values of T.
75  */
76 #define RTIMERTICKS_TO_US_64(rt) ( \
77  (uint32_t)( \
78  ((uint64_t)(rt) * 1000000 + (RTIMER_ARCH_SECOND / 2)) / RTIMER_ARCH_SECOND \
79  ))
80 /*---------------------------------------------------------------------------*/
81 #endif /* RTIMER_ARCH_H_ */
82 /*---------------------------------------------------------------------------*/
83 /**
84  * @}
85  * @}
86  */
rtimer_clock_t rtimer_arch_now(void)
Returns the current real-time clock time.
Definition: rtimer-arch.c:115