aboutsummaryrefslogtreecommitdiffstats
path: root/os/hal/include/icu.h
blob: 65d7794e50dfb412102642a2d0407efa04e46522 (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
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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*
    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    icu.h
 * @brief   ICU Driver macros and structures.
 *
 * @addtogroup ICU
 * @{
 */

#ifndef _ICU_H_
#define _ICU_H_

#if HAL_USE_ICU || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver constants.                                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Driver pre-compile time settings.                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Derived constants and error checks.                                       */
/*===========================================================================*/

/*===========================================================================*/
/* Driver data structures and types.                                         */
/*===========================================================================*/

/**
 * @brief   Driver state machine possible states.
 */
typedef enum {
  ICU_UNINIT = 0,                   /**< Not initialized.                   */
  ICU_STOP = 1,                     /**< Stopped.                           */
  ICU_READY = 2,                    /**< Ready.                             */
  ICU_WAITING = 3,                  /**< Waiting first edge.                */
  ICU_ACTIVE = 4,                   /**< Active cycle phase.                */
  ICU_IDLE = 5,                     /**< Idle cycle phase.                  */
} icustate_t;

/**
 * @brief   Type of a structure representing an ICU driver.
 */
typedef struct ICUDriver ICUDriver;

/**
 * @brief   ICU notification callback type.
 *
 * @param[in] icup      pointer to a @p ICUDriver object
 */
typedef void (*icucallback_t)(ICUDriver *icup);

#include "icu_lld.h"

/*===========================================================================*/
/* Driver macros.                                                            */
/*===========================================================================*/

/**
 * @name    Macro Functions
 * @{
 */
/**
 * @brief   Enables the input capture.
 *
 * @param[in] icup      pointer to the @p ICUDriver object
 *
 * @iclass
 */
#define icuEnableI(icup) icu_lld_enable(icup)

/**
 * @brief   Disables the input capture.
 *
 * @param[in] icup      pointer to the @p ICUDriver object
 *
 * @iclass
 */
#define icuDisableI(icup) icu_lld_disable(icup)

/**
 * @brief   Returns the width of the latest pulse.
 * @details The pulse width is defined as number of ticks between the start
 *          edge and the stop edge.
 *
 * @param[in] icup      pointer to the @p ICUDriver object
 * @return              The number of ticks.
 *
 * @iclass
 */
#define icuGetWidthI(icup) icu_lld_get_width(icup)

/**
 * @brief   Returns the width of the latest cycle.
 * @details The cycle width is defined as number of ticks between a start
 *          edge and the next start edge.
 *
 * @param[in] icup      pointer to the @p ICUDriver object
 * @return              The number of ticks.
 *
 * @iclass
 */
#define icuGetPeriodI(icup) icu_lld_get_period(icup)
/** @} */

/**
 * @name    Low Level driver helper macros
 * @{
 */
/**
 * @brief   Common ISR code, ICU width event.
 *
 * @param[in] icup      pointer to the @p ICUDriver object
 *
 * @notapi
 */
#define _icu_isr_invoke_width_cb(icup) {                                    \
  (icup)->state = ICU_IDLE;                                                 \
  (icup)->config->width_cb(icup);                                           \
}

/**
 * @brief   Common ISR code, ICU period event.
 *
 * @param[in] icup      pointer to the @p ICUDriver object
 *
 * @notapi
 */
#define _icu_isr_invoke_period_cb(icup) {                                   \
  icustate_t previous_state = (icup)->state;                                \
  (icup)->state = ICU_ACTIVE;                                               \
  if (previous_state != ICU_WAITING)                                        \
    (icup)->config->period_cb(icup);                                        \
}
/** @} */

/*===========================================================================*/
/* External declarations.                                                    */
/*===========================================================================*/

#ifdef __cplusplus
extern "C" {
#endif
  void icuInit(void);
  void icuObjectInit(ICUDriver *icup);
  void icuStart(ICUDriver *icup, const ICUConfig *config);
  void icuStop(ICUDriver *icup);
  void icuEnable(ICUDriver *icup);
  void icuDisable(ICUDriver *icup);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_ICU */

#endif /* _ICU_H_ */

/** @} */