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
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file chvt.h
* @brief Time macros and structures.
*
* @addtogroup time
* @{
*/
#ifndef _CHVT_H_
#define _CHVT_H_
/**
* @name Time conversion utilities
* @{
*/
/**
* @brief Time conversion utility.
* @details Converts from seconds to system ticks number.
* @note The result is rounded upward to the next tick boundary.
*/
#define S2ST(sec) ((systime_t)((sec) * CH_FREQUENCY))
/**
* @brief Time conversion utility.
* @details Converts from milliseconds to system ticks number.
* @note The result is rounded upward to the next tick boundary.
*/
#define MS2ST(msec) ((systime_t)(((((msec) - 1L) * CH_FREQUENCY) / 1000L) + 1L))
/**
* @brief Time conversion utility.
* @details Converts from microseconds to system ticks number.
* @note The result is rounded upward to the next tick boundary.
*/
#define US2ST(usec) ((systime_t)(((((usec) - 1L) * CH_FREQUENCY) / 1000000L) + 1L))
/** @} */
/**
* @brief Virtual Timer callback function.
*/
typedef void (*vtfunc_t)(void *);
/**
* @brief Virtual Timer structure type.
*/
typedef struct VirtualTimer VirtualTimer;
/**
* @extends DeltaList
*
* @brief Virtual Timer descriptor structure.
*/
struct VirtualTimer {
VirtualTimer *vt_next; /**< @brief Next timer in the delta
list. */
VirtualTimer *vt_prev; /**< @brief Previous timer in the delta
list. */
systime_t vt_time; /**< @brief Time delta before timeout. */
vtfunc_t vt_func; /**< @brief Timer callback function
pointer. */
void *vt_par; /**< @brief Timer callback function
parameter. */
};
/**
* @brief Virtual timers list header.
* @note The delta list is implemented as a double link bidirectional list
* in order to make the unlink time constant, the reset of a virtual
* timer is often used in the code.
*/
typedef struct {
VirtualTimer *vt_next; /**< @brief Next timer in the delta
list. */
VirtualTimer *vt_prev; /**< @brief Last timer in the delta
list. */
systime_t vt_time; /**< @brief Must be initialized to -1. */
volatile systime_t vt_systime; /**< @brief System Time counter. */
} VTList;
extern VTList vtlist;
/**
* @brief Virtual timers ticker.
*
* @iclass
*/
#define chVTDoTickI() { \
vtlist.vt_systime++; \
if (&vtlist != (VTList *)vtlist.vt_next) { \
VirtualTimer *vtp; \
\
--vtlist.vt_next->vt_time; \
while (!(vtp = vtlist.vt_next)->vt_time) { \
vtfunc_t fn = vtp->vt_func; \
vtp->vt_func = (vtfunc_t)NULL; \
vtp->vt_next->vt_prev = (void *)&vtlist; \
(&vtlist)->vt_next = vtp->vt_next; \
fn(vtp->vt_par); \
} \
} \
}
/**
* @brief Returns TRUE if the speciified timer is armed.
*
* @iclass
*/
#define chVTIsArmedI(vtp) ((vtp)->vt_func != NULL)
/**
* @brief Current system time.
* @details Returns the number of system ticks since the @p chSysInit()
* invocation.
* @note The counter can reach its maximum and then restart from zero.
* @note This function is designed to work with the @p chThdSleepUntil().
*
* @return The system time in ticks.r
*
* @api
*/
#define chTimeNow() (vtlist.vt_systime)
/*
* Virtual Timers APIs.
*/
#ifdef __cplusplus
extern "C" {
#endif
void _vt_init(void);
void chVTSetI(VirtualTimer *vtp, systime_t time, vtfunc_t vtfunc, void *par);
void chVTResetI(VirtualTimer *vtp);
bool_t chTimeIsWithin(systime_t start, systime_t end);
#ifdef __cplusplus
}
#endif
#endif /* _CHVT_H_ */
/** @} */
|
