aboutsummaryrefslogtreecommitdiffstats
path: root/os/hal/include/i2s.h
blob: 310ae35100d7a806439e7d8dec1f41f57b988713 (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
/*
    ChibiOS/HAL - Copyright (C) 2006,2007,2008,2009,2010,
                  2011,2012,2013,2014 Giovanni Di Sirio.

    This file is part of ChibiOS/HAL 

    ChibiOS/HAL 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    i2s.h
 * @brief   I2S Driver macros and structures.
 *
 * @addtogroup I2S
 * @{
 */

#ifndef _I2S_H_
#define _I2S_H_

#if HAL_USE_I2S || defined(__DOXYGEN__)

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

/**
 * @name    I2S modes
 * @{
 */
#define I2S_MODE_SLAVE          0
#define I2S_MODE_MASTER         1
/** @} */

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

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

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

/**
 * @brief   Driver state machine possible states.
 */
typedef enum {
  I2S_UNINIT = 0,                   /**< Not initialized.                   */
  I2S_STOP = 1,                     /**< Stopped.                           */
  I2S_READY = 2,                    /**< Ready.                             */
  I2S_ACTIVE = 3,                   /**< Active.                            */
  I2S_COMPLETE = 4                  /**< Transmission complete.             */
} i2sstate_t;

#include "i2s_lld.h"

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

/**
 * @name    Macro Functions
 * @{
 */
/**
 * @brief   Starts a I2S data exchange.
 *
 * @param[in] i2sp      pointer to the @p I2SDriver object
 * @param[in] n         size of the transmit buffer, must be even and greater
 *                      than zero
 * @param[out] txbuf    the pointer to the transmit buffer
 * @param[out] rxbuf    the pointer to the receive buffer
 *
 * @iclass
 */
#define i2sStartExchangeI(i2sp) {                                           \
  i2s_lld_start_exchange(i2sp);                                             \
  (i2sp)->state = I2S_ACTIVE;                                               \
}

/**
 * @brief   Stops the ongoing data exchange.
 * @details The ongoing data exchange, if any, is stopped, if the driver
 *          was not active the function does nothing.
 *
 * @param[in] i2sp      pointer to the @p I2SDriver object
 *
 * @iclass
 */
#define i2sStopExchangeI(i2sp) {                                            \
  i2s_lld_stop_exchange(i2sp);                                              \
  (i2sp)->state = I2S_READY;                                                \
}

/**
 * @brief   Common ISR code, half buffer event.
 * @details This code handles the portable part of the ISR code:
 *          - Callback invocation.
 *          .
 * @note    This macro is meant to be used in the low level drivers
 *          implementation only.
 *
 * @param[in] i2sp      pointer to the @p I2CDriver object
 *
 * @notapi
 */
#define _i2s_isr_half_code(i2sp) {                                          \
  if ((i2sp)->config->end_cb != NULL) {                                     \
    (i2sp)->config->end_cb(i2sp, 0, (i2sp)->config->size / 2);              \
  }                                                                         \
}

/**
 * @brief   Common ISR code.
 * @details This code handles the portable part of the ISR code:
 *          - Callback invocation.
 *          - Driver state transitions.
 *          .
 * @note    This macro is meant to be used in the low level drivers
 *          implementation only.
 *
 * @param[in] i2sp      pointer to the @p I2CDriver object
 *
 * @notapi
 */
#define _i2s_isr_full_code(i2sp) {                                               \
  if ((i2sp)->config->end_cb) {                                             \
    (i2sp)->state = I2S_COMPLETE;                                           \
    (i2sp)->config->end_cb(i2sp,                                            \
                           (i2sp)->config->size / 2,                        \
                           (i2sp)->config->size / 2);                       \
    if ((i2sp)->state == I2S_COMPLETE)                                      \
      (i2sp)->state = I2S_READY;                                            \
  }                                                                         \
  else                                                                      \
    (i2sp)->state = I2S_READY;                                              \
}
/** @} */

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

#ifdef __cplusplus
extern "C" {
#endif
  void i2sInit(void);
  void i2sObjectInit(I2SDriver *i2sp);
  void i2sStart(I2SDriver *i2sp, const I2SConfig *config);
  void i2sStop(I2SDriver *i2sp);
  void i2sStartExchange(I2SDriver *i2sp);
  void i2sStopExchange(I2SDriver *i2sp);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_I2S */

#endif /* _I2S_H_ */

/** @} */