ST / ST_I2S

STMicroelectronics' implementation of an I2S driver, also including DMA support.

Dependents:   temp X_NUCLEO_CCA01M1 X_NUCLEO_CCA01M1 X_NUCLEO_CCA02M1

Platform compatibility

This driver has been designed to support a wide range of the Nucleo F4 Family of platforms and MCUs, but not all members of this family support I2S and/or some of the members might require slight modifications to the sources of this driver in order to make it work on those.

This driver has for now been tested only with the following platforms:

drivers/I2S.cpp@16:04e1abb4cca3, 2017-01-25 (annotated)

Committer:
Wolfgang Betz
Date:
Wed Jan 25 13:56:15 2017 +0100
Revision:
16:04e1abb4cca3
Parent:
11:50562a5f8a93
Child:
17:7a4a4631672c
Make locking function become protected

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Wolfgang Betz 0:752e74bf5ef1 1 #include "drivers/I2S.h"
Wolfgang Betz 0:752e74bf5ef1 2 #include "platform/critical.h"
Wolfgang Betz 0:752e74bf5ef1 3 #include "platform/mbed_assert.h"
Wolfgang Betz 0:752e74bf5ef1 4
Wolfgang Betz 0:752e74bf5ef1 5 #if DEVICE_I2S
Wolfgang Betz 0:752e74bf5ef1 6
Wolfgang Betz 0:752e74bf5ef1 7 namespace mbed {
Wolfgang Betz 0:752e74bf5ef1 8
Wolfgang Betz 10:1a612c2e4a85 9 I2S* I2S::_owner = NULL;
Wolfgang Betz 10:1a612c2e4a85 10 SingletonPtr<PlatformMutex> I2S::_mutex; // intentional class level lock!
Wolfgang Betz 0:752e74bf5ef1 11
Wolfgang Betz 10:1a612c2e4a85 12 events::EventQueue I2S::i2s_bh_queue;
Wolfgang Betz 0:752e74bf5ef1 13
Wolfgang Betz 10:1a612c2e4a85 14 void I2S::lock() {
Wolfgang Betz 10:1a612c2e4a85 15 #if defined(NDEBUG) || !defined(MBED_CONF_RTOS_PRESENT)
Wolfgang Betz 10:1a612c2e4a85 16 _mutex->lock(); // intentional class level lock!
Wolfgang Betz 0:752e74bf5ef1 17 #else
Wolfgang Betz 10:1a612c2e4a85 18 osStatus ret = _mutex->lock(); // intentional class level lock!
Wolfgang Betz 10:1a612c2e4a85 19 MBED_ASSERT(ret == osOK);
Wolfgang Betz 0:752e74bf5ef1 20 #endif
Wolfgang Betz 10:1a612c2e4a85 21 }
Wolfgang Betz 10:1a612c2e4a85 22
Wolfgang Betz 10:1a612c2e4a85 23 void I2S::unlock() {
Wolfgang Betz 10:1a612c2e4a85 24 #if defined(NDEBUG) || !defined(MBED_CONF_RTOS_PRESENT)
Wolfgang Betz 10:1a612c2e4a85 25 _mutex->unlock(); // intentional class level lock!
Wolfgang Betz 10:1a612c2e4a85 26 #else
Wolfgang Betz 10:1a612c2e4a85 27 osStatus ret = _mutex->unlock(); // intentional class level lock!
Wolfgang Betz 10:1a612c2e4a85 28 MBED_ASSERT(ret == osOK);
Wolfgang Betz 10:1a612c2e4a85 29 #endif
Wolfgang Betz 10:1a612c2e4a85 30 }
Wolfgang Betz 0:752e74bf5ef1 31
Wolfgang Betz 10:1a612c2e4a85 32 I2S::I2S(PinName dpin, PinName clk, PinName wsel, PinName fdpin, PinName mck) :
Wolfgang Betz 16:04e1abb4cca3 33 _i2s(),
Wolfgang Betz 10:1a612c2e4a85 34 _irq_tx(this), _irq_rx(this),
Wolfgang Betz 10:1a612c2e4a85 35 _priority(MEDIUM),
Wolfgang Betz 10:1a612c2e4a85 36 _dbits(16),
Wolfgang Betz 10:1a612c2e4a85 37 _fbits(16),
Wolfgang Betz 10:1a612c2e4a85 38 _polarity(0),
Wolfgang Betz 10:1a612c2e4a85 39 _protocol(PHILIPS),
Wolfgang Betz 10:1a612c2e4a85 40 _mode(MASTER_TX),
Wolfgang Betz 10:1a612c2e4a85 41 _circular(false),
Wolfgang Betz 10:1a612c2e4a85 42 _hz(44100) {
Wolfgang Betz 10:1a612c2e4a85 43 lock();
Wolfgang Betz 10:1a612c2e4a85 44 /* Init instance */
Wolfgang Betz 10:1a612c2e4a85 45 i2s_init(&_i2s, dpin, clk, wsel, fdpin, mck, _mode);
Wolfgang Betz 10:1a612c2e4a85 46 acquire();
Wolfgang Betz 10:1a612c2e4a85 47 unlock();
Wolfgang Betz 10:1a612c2e4a85 48 }
Wolfgang Betz 0:752e74bf5ef1 49
Wolfgang Betz 10:1a612c2e4a85 50 int I2S::format(int dbits, int fbits, int polarity) {
Wolfgang Betz 10:1a612c2e4a85 51 lock();
Wolfgang Betz 10:1a612c2e4a85 52 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 53 unlock();
Wolfgang Betz 10:1a612c2e4a85 54 return -1;
Wolfgang Betz 0:752e74bf5ef1 55 }
Wolfgang Betz 10:1a612c2e4a85 56 _dbits = dbits;
Wolfgang Betz 10:1a612c2e4a85 57 _fbits = fbits;
Wolfgang Betz 10:1a612c2e4a85 58 _polarity = polarity;
Wolfgang Betz 10:1a612c2e4a85 59 I2S::_owner = NULL; // Not that elegant, but works. rmeyer
Wolfgang Betz 10:1a612c2e4a85 60 acquire();
Wolfgang Betz 10:1a612c2e4a85 61 unlock();
Wolfgang Betz 10:1a612c2e4a85 62 return 0;
Wolfgang Betz 10:1a612c2e4a85 63 }
Wolfgang Betz 0:752e74bf5ef1 64
Wolfgang Betz 10:1a612c2e4a85 65 int I2S::audio_frequency(unsigned int hz) {
Wolfgang Betz 10:1a612c2e4a85 66 lock();
Wolfgang Betz 10:1a612c2e4a85 67 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 68 unlock();
Wolfgang Betz 10:1a612c2e4a85 69 return -1;
Wolfgang Betz 0:752e74bf5ef1 70 }
Wolfgang Betz 10:1a612c2e4a85 71 _hz = hz;
Wolfgang Betz 10:1a612c2e4a85 72 I2S::_owner = NULL; // Not that elegant, but works. rmeyer
Wolfgang Betz 10:1a612c2e4a85 73 acquire();
Wolfgang Betz 10:1a612c2e4a85 74 unlock();
Wolfgang Betz 10:1a612c2e4a85 75 return 0;
Wolfgang Betz 10:1a612c2e4a85 76 }
Wolfgang Betz 0:752e74bf5ef1 77
Wolfgang Betz 10:1a612c2e4a85 78 int I2S::set_protocol(i2s_bitorder_t protocol) {
Wolfgang Betz 10:1a612c2e4a85 79 lock();
Wolfgang Betz 10:1a612c2e4a85 80 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 81 unlock();
Wolfgang Betz 10:1a612c2e4a85 82 return -1;
Wolfgang Betz 0:752e74bf5ef1 83 }
Wolfgang Betz 10:1a612c2e4a85 84 _protocol = protocol;
Wolfgang Betz 10:1a612c2e4a85 85 I2S::_owner = NULL; // Not that elegant, but works. rmeyer
Wolfgang Betz 10:1a612c2e4a85 86 acquire();
Wolfgang Betz 10:1a612c2e4a85 87 unlock();
Wolfgang Betz 10:1a612c2e4a85 88 return 0;
Wolfgang Betz 10:1a612c2e4a85 89 }
Wolfgang Betz 0:752e74bf5ef1 90
Wolfgang Betz 10:1a612c2e4a85 91 int I2S::set_mode(i2s_mode_t mode, bool circular) {
Wolfgang Betz 10:1a612c2e4a85 92 lock();
Wolfgang Betz 10:1a612c2e4a85 93 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 94 unlock();
Wolfgang Betz 10:1a612c2e4a85 95 return -1;
Wolfgang Betz 10:1a612c2e4a85 96 }
Wolfgang Betz 10:1a612c2e4a85 97 _mode = mode;
Wolfgang Betz 10:1a612c2e4a85 98 _circular = circular;
Wolfgang Betz 10:1a612c2e4a85 99 I2S::_owner = NULL; // Not that elegant, but works. rmeyer
Wolfgang Betz 10:1a612c2e4a85 100 acquire();
Wolfgang Betz 10:1a612c2e4a85 101 unlock();
Wolfgang Betz 10:1a612c2e4a85 102 return 0;
Wolfgang Betz 10:1a612c2e4a85 103 }
Wolfgang Betz 10:1a612c2e4a85 104
Wolfgang Betz 10:1a612c2e4a85 105 int I2S::harmonize(I2S &dev_i2s_1, I2S &dev_i2s_2) {
Wolfgang Betz 10:1a612c2e4a85 106 dev_i2s_1.lock();
Wolfgang Betz 10:1a612c2e4a85 107 if (i2s_active(&dev_i2s_1._i2s)) {
Wolfgang Betz 10:1a612c2e4a85 108 dev_i2s_1.unlock();
Wolfgang Betz 10:1a612c2e4a85 109 return -1;
Wolfgang Betz 0:752e74bf5ef1 110 }
Wolfgang Betz 9:c4c2240e06d6 111
Wolfgang Betz 10:1a612c2e4a85 112 dev_i2s_2.lock();
Wolfgang Betz 10:1a612c2e4a85 113 if (i2s_active(&dev_i2s_2._i2s)) {
Wolfgang Betz 11:50562a5f8a93 114 dev_i2s_2.unlock();
Wolfgang Betz 9:c4c2240e06d6 115 dev_i2s_1.unlock();
Wolfgang Betz 10:1a612c2e4a85 116 return -1;
Wolfgang Betz 9:c4c2240e06d6 117 }
Wolfgang Betz 9:c4c2240e06d6 118
Wolfgang Betz 10:1a612c2e4a85 119 uint32_t hz1 = dev_i2s_1._hz;
Wolfgang Betz 10:1a612c2e4a85 120 uint32_t hz2 = dev_i2s_2._hz;
Wolfgang Betz 10:1a612c2e4a85 121 int8_t ret = i2s_harmonize(&dev_i2s_1._i2s, &hz1, &dev_i2s_2._i2s, &hz2);
Wolfgang Betz 0:752e74bf5ef1 122
Wolfgang Betz 10:1a612c2e4a85 123 if(ret == 0) {
Wolfgang Betz 10:1a612c2e4a85 124 dev_i2s_1.audio_frequency(hz1);
Wolfgang Betz 10:1a612c2e4a85 125 dev_i2s_2.audio_frequency(hz2);
Wolfgang Betz 9:c4c2240e06d6 126 }
Wolfgang Betz 0:752e74bf5ef1 127
Wolfgang Betz 10:1a612c2e4a85 128 dev_i2s_2.unlock();
Wolfgang Betz 10:1a612c2e4a85 129 dev_i2s_1.unlock();
Wolfgang Betz 10:1a612c2e4a85 130
Wolfgang Betz 10:1a612c2e4a85 131 return ret;
Wolfgang Betz 10:1a612c2e4a85 132 }
Wolfgang Betz 10:1a612c2e4a85 133
Wolfgang Betz 10:1a612c2e4a85 134 void I2S::abort_transfer()
Wolfgang Betz 10:1a612c2e4a85 135 {
Wolfgang Betz 10:1a612c2e4a85 136 lock();
Wolfgang Betz 10:1a612c2e4a85 137 i2s_abort_asynch(&_i2s);
Wolfgang Betz 10:1a612c2e4a85 138 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 10:1a612c2e4a85 139 dequeue_transaction();
Wolfgang Betz 10:1a612c2e4a85 140 #endif
Wolfgang Betz 10:1a612c2e4a85 141 unlock();
Wolfgang Betz 10:1a612c2e4a85 142 }
Wolfgang Betz 10:1a612c2e4a85 143
Wolfgang Betz 0:752e74bf5ef1 144
Wolfgang Betz 10:1a612c2e4a85 145 void I2S::clear_transfer_buffer()
Wolfgang Betz 10:1a612c2e4a85 146 {
Wolfgang Betz 10:1a612c2e4a85 147 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 10:1a612c2e4a85 148 lock();
Wolfgang Betz 10:1a612c2e4a85 149 _transaction_buffer.reset();
Wolfgang Betz 10:1a612c2e4a85 150 unlock();
Wolfgang Betz 10:1a612c2e4a85 151 #endif
Wolfgang Betz 10:1a612c2e4a85 152 }
Wolfgang Betz 0:752e74bf5ef1 153
Wolfgang Betz 10:1a612c2e4a85 154 void I2S::abort_all_transfers()
Wolfgang Betz 10:1a612c2e4a85 155 {
Wolfgang Betz 10:1a612c2e4a85 156 lock();
Wolfgang Betz 10:1a612c2e4a85 157 clear_transfer_buffer();
Wolfgang Betz 10:1a612c2e4a85 158 abort_transfer();
Wolfgang Betz 10:1a612c2e4a85 159 unlock();
Wolfgang Betz 10:1a612c2e4a85 160 }
Wolfgang Betz 10:1a612c2e4a85 161
Wolfgang Betz 10:1a612c2e4a85 162 int I2S::get_transfer_status()
Wolfgang Betz 10:1a612c2e4a85 163 {
Wolfgang Betz 10:1a612c2e4a85 164 lock();
Wolfgang Betz 10:1a612c2e4a85 165 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 166 unlock();
Wolfgang Betz 10:1a612c2e4a85 167 return -1;
Wolfgang Betz 0:752e74bf5ef1 168 }
Wolfgang Betz 10:1a612c2e4a85 169 unlock();
Wolfgang Betz 10:1a612c2e4a85 170 return 0;
Wolfgang Betz 10:1a612c2e4a85 171 }
Wolfgang Betz 0:752e74bf5ef1 172
Wolfgang Betz 10:1a612c2e4a85 173 unsigned int I2S::get_module()
Wolfgang Betz 10:1a612c2e4a85 174 {
Wolfgang Betz 10:1a612c2e4a85 175 return i2s_get_module(&_i2s);
Wolfgang Betz 10:1a612c2e4a85 176 }
Wolfgang Betz 0:752e74bf5ef1 177
Wolfgang Betz 10:1a612c2e4a85 178 int I2S::set_dma_priority(i2s_dma_prio_t prio)
Wolfgang Betz 10:1a612c2e4a85 179 {
Wolfgang Betz 10:1a612c2e4a85 180 lock();
Wolfgang Betz 10:1a612c2e4a85 181 if (i2s_active(&_i2s)) {
Wolfgang Betz 10:1a612c2e4a85 182 unlock();
Wolfgang Betz 10:1a612c2e4a85 183 return -1;
Wolfgang Betz 10:1a612c2e4a85 184 }
Wolfgang Betz 10:1a612c2e4a85 185 _priority = prio;
Wolfgang Betz 10:1a612c2e4a85 186 unlock();
Wolfgang Betz 10:1a612c2e4a85 187 return 0;
Wolfgang Betz 10:1a612c2e4a85 188 }
Wolfgang Betz 10:1a612c2e4a85 189
Wolfgang Betz 10:1a612c2e4a85 190 int I2S::queue_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, const event_callback_t& callback, int event)
Wolfgang Betz 10:1a612c2e4a85 191 { // betzw: MUST be called with lock held!
Wolfgang Betz 10:1a612c2e4a85 192 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 10:1a612c2e4a85 193 transaction_t t;
Wolfgang Betz 10:1a612c2e4a85 194
Wolfgang Betz 10:1a612c2e4a85 195 t.tx_buffer = const_cast<void *>(tx_buffer);
Wolfgang Betz 10:1a612c2e4a85 196 t.tx_length = tx_length;
Wolfgang Betz 10:1a612c2e4a85 197 t.rx_buffer = rx_buffer;
Wolfgang Betz 10:1a612c2e4a85 198 t.rx_length = rx_length;
Wolfgang Betz 10:1a612c2e4a85 199 t.event = event;
Wolfgang Betz 10:1a612c2e4a85 200 t.callback = callback;
Wolfgang Betz 10:1a612c2e4a85 201 t.width = 16;
Wolfgang Betz 10:1a612c2e4a85 202 Transaction<I2S> transaction(this, t);
Wolfgang Betz 10:1a612c2e4a85 203 core_util_critical_section_enter();
Wolfgang Betz 10:1a612c2e4a85 204 if (_transaction_buffer.full()) {
Wolfgang Betz 9:c4c2240e06d6 205 core_util_critical_section_enter();
Wolfgang Betz 10:1a612c2e4a85 206 return -1; // the buffer is full
Wolfgang Betz 10:1a612c2e4a85 207 } else {
Wolfgang Betz 10:1a612c2e4a85 208 _transaction_buffer.push(transaction);
Wolfgang Betz 10:1a612c2e4a85 209 core_util_critical_section_exit();
Wolfgang Betz 10:1a612c2e4a85 210 return 0;
Wolfgang Betz 10:1a612c2e4a85 211 }
Wolfgang Betz 9:c4c2240e06d6 212 #else
Wolfgang Betz 10:1a612c2e4a85 213 return -1;
Wolfgang Betz 9:c4c2240e06d6 214 #endif
Wolfgang Betz 10:1a612c2e4a85 215 }
Wolfgang Betz 0:752e74bf5ef1 216
Wolfgang Betz 0:752e74bf5ef1 217
Wolfgang Betz 9:c4c2240e06d6 218 // ignore the fact that there are multiple physical i2s's, and always update if it wasn't us last
Wolfgang Betz 10:1a612c2e4a85 219 void I2S::acquire() { // betzw: MUST be called with lock held!
Wolfgang Betz 10:1a612c2e4a85 220 if (_owner != this) {
Wolfgang Betz 10:1a612c2e4a85 221 i2s_format(&_i2s, _dbits, _fbits, _polarity);
Wolfgang Betz 10:1a612c2e4a85 222 i2s_audio_frequency(&_i2s, _hz);
Wolfgang Betz 10:1a612c2e4a85 223 i2s_set_protocol(&_i2s, _protocol);
Wolfgang Betz 10:1a612c2e4a85 224 i2s_set_mode(&_i2s, _mode);
Wolfgang Betz 10:1a612c2e4a85 225 _owner = this;
Wolfgang Betz 0:752e74bf5ef1 226 }
Wolfgang Betz 10:1a612c2e4a85 227 }
Wolfgang Betz 0:752e74bf5ef1 228
Wolfgang Betz 10:1a612c2e4a85 229 void I2S::start_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length,
Wolfgang Betz 10:1a612c2e4a85 230 const event_callback_t& callback, int event)
Wolfgang Betz 10:1a612c2e4a85 231 { // betzw: MUST be called with lock held!
Wolfgang Betz 10:1a612c2e4a85 232 acquire();
Wolfgang Betz 10:1a612c2e4a85 233 _callback = callback;
Wolfgang Betz 10:1a612c2e4a85 234 _irq_tx.callback(&I2S::irq_handler_asynch_tx);
Wolfgang Betz 10:1a612c2e4a85 235 _irq_rx.callback(&I2S::irq_handler_asynch_rx);
Wolfgang Betz 10:1a612c2e4a85 236 i2s_transfer(&_i2s,
Wolfgang Betz 10:1a612c2e4a85 237 const_cast<void *>(tx_buffer), tx_length, rx_buffer, rx_length,
Wolfgang Betz 10:1a612c2e4a85 238 _circular, _priority,
Wolfgang Betz 10:1a612c2e4a85 239 _irq_tx.entry(), _irq_rx.entry(),
Wolfgang Betz 10:1a612c2e4a85 240 event);
Wolfgang Betz 10:1a612c2e4a85 241 }
Wolfgang Betz 0:752e74bf5ef1 242
Wolfgang Betz 0:752e74bf5ef1 243 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 0:752e74bf5ef1 244
Wolfgang Betz 10:1a612c2e4a85 245 void I2S::start_transaction(transaction_t *data)
Wolfgang Betz 10:1a612c2e4a85 246 { // betzw: MUST be called with lock held!
Wolfgang Betz 10:1a612c2e4a85 247 start_transfer(data->tx_buffer, data->tx_length, data->rx_buffer, data->rx_length, data->callback, data->event);
Wolfgang Betz 10:1a612c2e4a85 248 }
Wolfgang Betz 0:752e74bf5ef1 249
Wolfgang Betz 10:1a612c2e4a85 250 void I2S::dequeue_transaction()
Wolfgang Betz 10:1a612c2e4a85 251 {
Wolfgang Betz 10:1a612c2e4a85 252 lock();
Wolfgang Betz 10:1a612c2e4a85 253 if (!i2s_active(&_i2s)) {
Wolfgang Betz 10:1a612c2e4a85 254 Transaction<I2S> t;
Wolfgang Betz 10:1a612c2e4a85 255 if (_transaction_buffer.pop(t)) {
Wolfgang Betz 10:1a612c2e4a85 256 I2S* obj = t.get_object();
Wolfgang Betz 10:1a612c2e4a85 257 transaction_t* data = t.get_transaction();
Wolfgang Betz 16:04e1abb4cca3 258 MBED_ASSERT(obj == this);
Wolfgang Betz 10:1a612c2e4a85 259 obj->start_transaction(data);
Wolfgang Betz 9:c4c2240e06d6 260 }
Wolfgang Betz 0:752e74bf5ef1 261 }
Wolfgang Betz 10:1a612c2e4a85 262 unlock();
Wolfgang Betz 10:1a612c2e4a85 263 }
Wolfgang Betz 0:752e74bf5ef1 264
Wolfgang Betz 0:752e74bf5ef1 265 #endif
Wolfgang Betz 0:752e74bf5ef1 266
Wolfgang Betz 10:1a612c2e4a85 267 void I2S::irq_handler_asynch_rx(void)
Wolfgang Betz 10:1a612c2e4a85 268 {
Wolfgang Betz 10:1a612c2e4a85 269 int event = i2s_irq_handler_asynch(&_i2s, I2S_RX_EVENT);
Wolfgang Betz 10:1a612c2e4a85 270 if (_callback && (event & I2S_EVENT_ALL)) {
Wolfgang Betz 10:1a612c2e4a85 271 I2sBhHandler::i2s_defer_function(_callback, event & I2S_EVENT_ALL);
Wolfgang Betz 10:1a612c2e4a85 272 }
Wolfgang Betz 0:752e74bf5ef1 273 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 10:1a612c2e4a85 274 if (event & I2S_EVENT_INTERNAL_TRANSFER_COMPLETE) {
Wolfgang Betz 10:1a612c2e4a85 275 I2sBhHandler::i2s_defer_function(Callback<void()>(this, &I2S::dequeue_transaction));
Wolfgang Betz 10:1a612c2e4a85 276 }
Wolfgang Betz 0:752e74bf5ef1 277 #endif
Wolfgang Betz 10:1a612c2e4a85 278 }
Davide Aliprandi 4:21603d68bcf7 279
Wolfgang Betz 10:1a612c2e4a85 280 void I2S::irq_handler_asynch_tx(void)
Wolfgang Betz 10:1a612c2e4a85 281 {
Wolfgang Betz 10:1a612c2e4a85 282 int event = i2s_irq_handler_asynch(&_i2s, I2S_TX_EVENT);
Wolfgang Betz 10:1a612c2e4a85 283 if (_callback && (event & I2S_EVENT_ALL)) {
Wolfgang Betz 10:1a612c2e4a85 284 I2sBhHandler::i2s_defer_function(_callback, event & I2S_EVENT_ALL);
Wolfgang Betz 10:1a612c2e4a85 285 }
Wolfgang Betz 9:c4c2240e06d6 286 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 10:1a612c2e4a85 287 if (event & I2S_EVENT_INTERNAL_TRANSFER_COMPLETE) {
Wolfgang Betz 10:1a612c2e4a85 288 I2sBhHandler::i2s_defer_function(Callback<void()>(this, &I2S::dequeue_transaction));
Wolfgang Betz 10:1a612c2e4a85 289 }
Wolfgang Betz 9:c4c2240e06d6 290 #endif
Wolfgang Betz 10:1a612c2e4a85 291 }
Davide Aliprandi 4:21603d68bcf7 292
Wolfgang Betz 0:752e74bf5ef1 293 } // namespace mbed
Wolfgang Betz 0:752e74bf5ef1 294
Wolfgang Betz 0:752e74bf5ef1 295 #endif