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
|
/*
* This file is subject to the terms of the GFX License, v1.0. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://chibios-gfx.com/license.html
*/
#ifndef _GTIMER_H
#define _GTIMER_H
#include "gfx.h"
#if GFX_USE_GTIMER || defined(__DOXYGEN__)
/*===========================================================================*/
/* Type definitions */
/*===========================================================================*/
/* Data part of a static GTimer initialiser */
#define _GTIMER_DATA() {0,0,0,0,0,0,0}
/* Static GTimer initialiser */
#define GTIMER_DECL(name) GTimer name = _GTIMER_DATA()
/* A callback function (executed in a thread context) */
typedef void (*GTimerFunction)(void *param);
/**
* @brief A GTimer structure
*/
typedef struct GTimer_t {
GTimerFunction fn;
void *param;
systime_t when;
systime_t period;
uint16_t flags;
struct GTimer_t *next;
struct GTimer_t *prev;
} GTimer;
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Initialise a timer.
*
* @param[in] pt pointer to a GTimer structure
*
* @api
*/
void gtimerInit(GTimer *pt);
/**
* @brief Set a timer going or alter its properties if it is already going.
*
* @param[in] pt Pointer to a GTimer structure
* @param[in] fn The callback function
* @param[in] param The parameter to pass to the callback function
* @param[in] periodic Is the timer a periodic timer? FALSE is a once-only timer.
* @param[in] millisec The timer period. The following special values are allowed:
* TIME_IMMEDIATE causes the callback function to be called asap.
* A periodic timer with this value will fire once only.
* TIME_INFINITE never timeout (unless triggered by gtimerJab or gtimerJabI)
*
* @note If the timer is already active its properties are updated with the new parameters.
* The current period will be immediately canceled (without the callback function being
* called) and the timer will be restart with the new timer properties.
* @note The callback function should be careful not to over-run the thread stack.
* Define a new value for the macro GTIME_THREAD_STACK_SIZE if you want to
* change the default size.
* @note The callback function should return as quickly as possible as all
* timer callbacks are performed by a single thread. If a callback function
* takes too long it could affect the timer response for other timers.
* @note A timer callback function is not a replacement for a dedicated thread if the
* function wants to perform computationally expensive stuff.
* @note As the callback function is called on GTIMER's thread, the function must make sure it uses
* appropriate synchronisation controls such as semaphores or mutexes around any data
* structures it shares with other threads such as the main application thread.
*
* @api
*/
void gtimerStart(GTimer *pt, GTimerFunction fn, void *param, bool_t periodic, systime_t millisec);
/**
* @brief Stop a timer (periodic or otherwise)
*
* @param[in] pt Pointer to a GTimer structure
*
* @note If the timer is not active this does nothing.
*
* @api
*/
void gtimerStop(GTimer *pt);
/**
* @brief Test if a timer is currently active
*
* @param[in] pt Pointer to a GTimer structure
*
* @return TRUE if active, FALSE otherwise
*
* @api
*/
bool_t gtimerIsActive(GTimer *pt);
/**
* @brief Jab a timer causing the current period to immediate expire
* @details The callback function will be called as soon as possible.
*
* @pre Use from a normal thread context.
*
* @param[in] pt Pointer to a GTimer structure
*
* @note If the timer is not active this does nothing.
* @note Repeated Jabs before the callback function actually happens are ignored.
*
* @api
*/
void gtimerJab(GTimer *pt);
/**
* @brief Jab a timer causing the current period to immediate expire
* @details The callback function will be called as soon as possible.
*
* @pre Use from an interrupt routine context.
*
* @param[in] pt Pointer to a GTimer structure
*
* @note If the timer is not active this does nothing.
* @note Repeated Jabs before the callback function actually happens are ignored.
*
* @iclass
* @api
*/
void gtimerJabI(GTimer *pt);
#ifdef __cplusplus
}
#endif
#endif /* GFX_USE_GTIMER */
#endif /* _GTIMER_H */
/** @} */
|
