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
|
/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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 templates/i2s_lld.c
* @brief I2S Driver subsystem low level driver source template.
*
* @addtogroup I2S
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_I2S || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level I2S driver initialization.
*
* @notapi
*/
void i2s_lld_init(void) {
#if STM32_I2S_USE_I2S2
spiObjectInit(&I2SD2);
I2SD2.spi = SPI2;
#endif
#if STM32_I2S_USE_I2S3
spiObjectInit(&I2SD3);
I2SD3.spi = SPI3;
#endif
}
/**
* @brief Configures and activates the I2S peripheral.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @notapi
*/
void i2s_lld_start(I2SDriver *i2sp) {
/* If in stopped state then enables the SPI and DMA clocks.*/
if (i2sp->state == I2S_STOP) {
#if STM32_SPI_USE_SPI2
if (&SPID2 == spip) {
bool_t b;
b = dmaStreamAllocate(spip->dma,
STM32_I2S_I2S2_IRQ_PRIORITY,
(stm32_dmaisr_t)i2s_lld_serve_rx_interrupt,
(void *)spip);
chDbgAssert(!b, "spi_lld_start(), #1", "stream already allocated");
rccEnableSPI2(FALSE);
}
#endif
#if STM32_SPI_USE_SPI3
if (&SPID3 == spip) {
bool_t b;
b = dmaStreamAllocate(spip->dma,
STM32_I2S_I2S3_IRQ_PRIORITY,
(stm32_dmaisr_t)i2s_lld_serve_rx_interrupt,
(void *)spip);
chDbgAssert(!b, "spi_lld_start(), #2", "stream already allocated");
rccEnableSPI3(FALSE);
}
#endif
}
/* Configuration.*/
}
/**
* @brief Deactivates the I2S peripheral.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @notapi
*/
void i2s_lld_stop(I2SDriver *i2sp) {
if (i2sp->state == I2S_READY) {
/* Clock deactivation.*/
}
}
/**
* @brief Starts a I2S data exchange.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @notapi
*/
void i2s_lld_start_exchange(I2SDriver *i2sp) {
}
/**
* @brief Starts a I2S data exchange in continuous mode.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @notapi
*/
void i2s_lld_start_exchange_continuous(I2SDriver *i2sp) {
}
/**
* @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
*
* @notapi
*/
void i2s_lld_stop_exchange(I2SDriver *i2sp) {
}
#endif /* HAL_USE_I2S */
/** @} */
|
