blob: 2a45f3e4024d6c5fc32e4902b9f4ae81457cfbc9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
#ifndef CSR_TIME_H__
#define CSR_TIME_H__
/*****************************************************************************
(c) Cambridge Silicon Radio Limited 2010
All rights reserved and confidential information of CSR
Refer to LICENSE.txt included with this source for details
on the license terms.
*****************************************************************************/
#include <linux/types.h>
#ifdef __cplusplus
extern "C" {
#endif
/*******************************************************************************
NAME
CsrTime
DESCRIPTION
Type to hold a value describing the current system time, which is a
measure of time elapsed since some arbitrarily defined fixed time
reference, usually associated with system startup.
*******************************************************************************/
typedef u32 CsrTime;
/*******************************************************************************
NAME
CsrTimeUtc
DESCRIPTION
Type to hold a value describing a UTC wallclock time expressed in
seconds and milliseconds elapsed since midnight January 1st 1970.
*******************************************************************************/
typedef struct
{
u32 sec;
u16 msec;
} CsrTimeUtc;
/*******************************************************************************
NAME
CsrTimeGet
DESCRIPTION
Returns the current system time in a low and a high part. The low part
is expressed in microseconds. The high part is incremented when the low
part wraps to provide an extended range.
The caller may provide a NULL pointer as the high parameter. In this case
the function just returns the low part and ignores the high parameter.
Although the time is expressed in microseconds the actual resolution is
platform dependent and can be less. It is recommended that the
resolution is at least 10 milliseconds.
PARAMETERS
high - Pointer to variable that will receive the high part of the
current system time. Passing NULL is valid.
RETURNS
Low part of current system time in microseconds.
*******************************************************************************/
CsrTime CsrTimeGet(CsrTime *high);
/*------------------------------------------------------------------*/
/* CsrTime Macros */
/*------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*
* NAME
* CsrTimeAdd
*
* DESCRIPTION
* Add two time values. Adding the numbers can overflow the range of a
* CsrTime, so the user must be cautious.
*
* RETURNS
* CsrTime - the sum of "t1" and "t2".
*
*----------------------------------------------------------------------------*/
#define CsrTimeAdd(t1, t2) ((t1) + (t2))
/*----------------------------------------------------------------------------*
* NAME
* CsrTimeSub
*
* DESCRIPTION
* Subtract two time values. Subtracting the numbers can provoke an
* underflow, so the user must be cautious.
*
* RETURNS
* CsrTime - "t1" - "t2".
*
*----------------------------------------------------------------------------*/
#define CsrTimeSub(t1, t2) ((s32) (t1) - (s32) (t2))
#ifdef __cplusplus
}
#endif
#endif
|
