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@9:c4c2240e06d6, 2016-12-22 (annotated)

Committer:
Wolfgang Betz
Date:
Thu Dec 22 11:10:10 2016 +0100
Revision:
9:c4c2240e06d6
Parent:
4:21603d68bcf7
Child:
10:1a612c2e4a85
Separate platform-independent from platform-dependent code

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 0:752e74bf5ef1 9 /* betzw - WAS
Wolfgang Betz 9:c4c2240e06d6 10 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 9:c4c2240e06d6 11 CircularBuffer<Transaction<I2S>, TRANSACTION_QUEUE_SIZE_I2S> I2S::_transaction_buffer;
Wolfgang Betz 9:c4c2240e06d6 12 #endif
Wolfgang Betz 0:752e74bf5ef1 13 */
Wolfgang Betz 0:752e74bf5ef1 14
Wolfgang Betz 9:c4c2240e06d6 15 I2S* I2S::_owner = NULL;
Wolfgang Betz 9:c4c2240e06d6 16 SingletonPtr<PlatformMutex> I2S::_mutex; // intentional class level lock!
Wolfgang Betz 0:752e74bf5ef1 17
Wolfgang Betz 9:c4c2240e06d6 18 rtos::Thread I2S::I2sBhHandler::_i2s_bh_daemon;
Wolfgang Betz 9:c4c2240e06d6 19 events::EventQueue I2S::I2sBhHandler::_i2s_bh_queue;
Wolfgang Betz 0:752e74bf5ef1 20
Wolfgang Betz 9:c4c2240e06d6 21 void I2S::lock() {
Wolfgang Betz 0:752e74bf5ef1 22 #ifdef NDEBUG
Wolfgang Betz 9:c4c2240e06d6 23 _mutex->lock(); // intentional class level lock!
Wolfgang Betz 0:752e74bf5ef1 24 #else
Wolfgang Betz 9:c4c2240e06d6 25 osStatus ret = _mutex->lock(); // intentional class level lock!
Wolfgang Betz 9:c4c2240e06d6 26 MBED_ASSERT(ret == osOK);
Wolfgang Betz 0:752e74bf5ef1 27 #endif
Wolfgang Betz 9:c4c2240e06d6 28 }
Wolfgang Betz 0:752e74bf5ef1 29
Wolfgang Betz 9:c4c2240e06d6 30 void I2S::unlock() {
Wolfgang Betz 0:752e74bf5ef1 31 #ifdef NDEBUG
Wolfgang Betz 9:c4c2240e06d6 32 _mutex->unlock(); // intentional class level lock!
Wolfgang Betz 0:752e74bf5ef1 33 #else
Wolfgang Betz 9:c4c2240e06d6 34 osStatus ret = _mutex->unlock(); // intentional class level lock!
Wolfgang Betz 9:c4c2240e06d6 35 MBED_ASSERT(ret == osOK);
Wolfgang Betz 0:752e74bf5ef1 36 #endif
Wolfgang Betz 9:c4c2240e06d6 37 }
Wolfgang Betz 0:752e74bf5ef1 38
Wolfgang Betz 9:c4c2240e06d6 39 I2S::I2S(PinName dpin, PinName clk, PinName wsel, PinName fdpin, PinName mck) :
Wolfgang Betz 0:752e74bf5ef1 40 _i2s(),
Wolfgang Betz 9:c4c2240e06d6 41 _irq_tx(this), _irq_rx(this),
Wolfgang Betz 9:c4c2240e06d6 42 _priority(MEDIUM),
Wolfgang Betz 9:c4c2240e06d6 43 _dbits(16),
Wolfgang Betz 9:c4c2240e06d6 44 _fbits(16),
Wolfgang Betz 9:c4c2240e06d6 45 _polarity(0),
Wolfgang Betz 9:c4c2240e06d6 46 _protocol(PHILIPS),
Wolfgang Betz 9:c4c2240e06d6 47 _mode(MASTER_TX),
Wolfgang Betz 9:c4c2240e06d6 48 _circular(false),
Wolfgang Betz 9:c4c2240e06d6 49 _hz(44100) {
Wolfgang Betz 9:c4c2240e06d6 50 lock();
Wolfgang Betz 9:c4c2240e06d6 51 /* Init instance */
Wolfgang Betz 9:c4c2240e06d6 52 i2s_init(&_i2s, dpin, clk, wsel, fdpin, mck, _mode);
Wolfgang Betz 9:c4c2240e06d6 53 acquire();
Wolfgang Betz 0:752e74bf5ef1 54 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 9:c4c2240e06d6 55 /* Init bottom half daemon */
Wolfgang Betz 9:c4c2240e06d6 56 I2sBhHandler::init();
Wolfgang Betz 0:752e74bf5ef1 57 #endif
Wolfgang Betz 9:c4c2240e06d6 58 unlock();
Wolfgang Betz 9:c4c2240e06d6 59 }
Wolfgang Betz 0:752e74bf5ef1 60
Wolfgang Betz 9:c4c2240e06d6 61 int I2S::format(int dbits, int fbits, int polarity) {
Wolfgang Betz 9:c4c2240e06d6 62 lock();
Wolfgang Betz 9:c4c2240e06d6 63 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 64 unlock();
Wolfgang Betz 9:c4c2240e06d6 65 return -1;
Wolfgang Betz 9:c4c2240e06d6 66 }
Wolfgang Betz 9:c4c2240e06d6 67 _dbits = dbits;
Wolfgang Betz 9:c4c2240e06d6 68 _fbits = fbits;
Wolfgang Betz 9:c4c2240e06d6 69 _polarity = polarity;
Wolfgang Betz 9:c4c2240e06d6 70 I2S::_owner = NULL; // Not that elegant, but works. rmeyer
Wolfgang Betz 9:c4c2240e06d6 71 acquire();
Wolfgang Betz 9:c4c2240e06d6 72 unlock();
Wolfgang Betz 9:c4c2240e06d6 73 return 0;
Wolfgang Betz 0:752e74bf5ef1 74 }
Wolfgang Betz 0:752e74bf5ef1 75
Wolfgang Betz 9:c4c2240e06d6 76 int I2S::audio_frequency(unsigned int hz) {
Wolfgang Betz 9:c4c2240e06d6 77 lock();
Wolfgang Betz 9:c4c2240e06d6 78 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 79 unlock();
Wolfgang Betz 9:c4c2240e06d6 80 return -1;
Wolfgang Betz 9:c4c2240e06d6 81 }
Wolfgang Betz 9:c4c2240e06d6 82 _hz = hz;
Wolfgang Betz 9:c4c2240e06d6 83 I2S::_owner = NULL; // Not that elegant, but works. rmeyer
Wolfgang Betz 9:c4c2240e06d6 84 acquire();
Wolfgang Betz 9:c4c2240e06d6 85 unlock();
Wolfgang Betz 9:c4c2240e06d6 86 return 0;
Wolfgang Betz 0:752e74bf5ef1 87 }
Wolfgang Betz 0:752e74bf5ef1 88
Wolfgang Betz 9:c4c2240e06d6 89 int I2S::set_protocol(i2s_bitorder_t protocol) {
Wolfgang Betz 9:c4c2240e06d6 90 lock();
Wolfgang Betz 9:c4c2240e06d6 91 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 92 unlock();
Wolfgang Betz 9:c4c2240e06d6 93 return -1;
Wolfgang Betz 9:c4c2240e06d6 94 }
Wolfgang Betz 9:c4c2240e06d6 95 _protocol = protocol;
Wolfgang Betz 9:c4c2240e06d6 96 I2S::_owner = NULL; // Not that elegant, but works. rmeyer
Wolfgang Betz 9:c4c2240e06d6 97 acquire();
Wolfgang Betz 9:c4c2240e06d6 98 unlock();
Wolfgang Betz 9:c4c2240e06d6 99 return 0;
Wolfgang Betz 0:752e74bf5ef1 100 }
Wolfgang Betz 0:752e74bf5ef1 101
Wolfgang Betz 9:c4c2240e06d6 102 int I2S::set_mode(i2s_mode_t mode, bool circular) {
Wolfgang Betz 9:c4c2240e06d6 103 lock();
Wolfgang Betz 9:c4c2240e06d6 104 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 105 unlock();
Wolfgang Betz 9:c4c2240e06d6 106 return -1;
Wolfgang Betz 9:c4c2240e06d6 107 }
Wolfgang Betz 9:c4c2240e06d6 108 _mode = mode;
Wolfgang Betz 9:c4c2240e06d6 109 _circular = circular;
Wolfgang Betz 9:c4c2240e06d6 110 I2S::_owner = NULL; // Not that elegant, but works. rmeyer
Wolfgang Betz 9:c4c2240e06d6 111 acquire();
Wolfgang Betz 9:c4c2240e06d6 112 unlock();
Wolfgang Betz 9:c4c2240e06d6 113 return 0;
Wolfgang Betz 0:752e74bf5ef1 114 }
Wolfgang Betz 9:c4c2240e06d6 115
Wolfgang Betz 9:c4c2240e06d6 116 int I2S::harmonize(I2S &dev_i2s_1, I2S &dev_i2s_2) {
Wolfgang Betz 9:c4c2240e06d6 117 dev_i2s_1.lock();
Wolfgang Betz 9:c4c2240e06d6 118 if (i2s_active(&dev_i2s_1._i2s)) {
Wolfgang Betz 9:c4c2240e06d6 119 dev_i2s_1.unlock();
Wolfgang Betz 9:c4c2240e06d6 120 return -1;
Wolfgang Betz 9:c4c2240e06d6 121 }
Wolfgang Betz 9:c4c2240e06d6 122
Wolfgang Betz 9:c4c2240e06d6 123 dev_i2s_2.lock();
Wolfgang Betz 9:c4c2240e06d6 124 if (i2s_active(&dev_i2s_2._i2s)) {
Wolfgang Betz 9:c4c2240e06d6 125 dev_i2s_1.unlock();
Wolfgang Betz 9:c4c2240e06d6 126 return -1;
Wolfgang Betz 9:c4c2240e06d6 127 }
Wolfgang Betz 9:c4c2240e06d6 128
Wolfgang Betz 9:c4c2240e06d6 129 uint32_t hz1 = dev_i2s_1._hz;
Wolfgang Betz 9:c4c2240e06d6 130 uint32_t hz2 = dev_i2s_2._hz;
Wolfgang Betz 9:c4c2240e06d6 131 int8_t ret = i2s_harmonize(&dev_i2s_1._i2s, &hz1, &dev_i2s_2._i2s, &hz2);
Wolfgang Betz 0:752e74bf5ef1 132
Wolfgang Betz 9:c4c2240e06d6 133 if(ret == 0) {
Wolfgang Betz 9:c4c2240e06d6 134 dev_i2s_1.audio_frequency(hz1);
Wolfgang Betz 9:c4c2240e06d6 135 dev_i2s_2.audio_frequency(hz2);
Wolfgang Betz 9:c4c2240e06d6 136 }
Wolfgang Betz 9:c4c2240e06d6 137
Wolfgang Betz 9:c4c2240e06d6 138 dev_i2s_2.unlock();
Wolfgang Betz 9:c4c2240e06d6 139 dev_i2s_1.unlock();
Wolfgang Betz 9:c4c2240e06d6 140
Wolfgang Betz 9:c4c2240e06d6 141 return ret;
Wolfgang Betz 9:c4c2240e06d6 142 }
Wolfgang Betz 9:c4c2240e06d6 143
Wolfgang Betz 9:c4c2240e06d6 144 void I2S::abort_transfer()
Wolfgang Betz 9:c4c2240e06d6 145 {
Wolfgang Betz 9:c4c2240e06d6 146 lock();
Wolfgang Betz 9:c4c2240e06d6 147 i2s_abort_asynch(&_i2s);
Wolfgang Betz 0:752e74bf5ef1 148 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 9:c4c2240e06d6 149 dequeue_transaction();
Wolfgang Betz 0:752e74bf5ef1 150 #endif
Wolfgang Betz 9:c4c2240e06d6 151 unlock();
Wolfgang Betz 9:c4c2240e06d6 152 }
Wolfgang Betz 0:752e74bf5ef1 153
Wolfgang Betz 0:752e74bf5ef1 154
Wolfgang Betz 9:c4c2240e06d6 155 void I2S::clear_transfer_buffer()
Wolfgang Betz 9:c4c2240e06d6 156 {
Wolfgang Betz 0:752e74bf5ef1 157 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 9:c4c2240e06d6 158 lock();
Wolfgang Betz 9:c4c2240e06d6 159 _transaction_buffer.reset();
Wolfgang Betz 9:c4c2240e06d6 160 unlock();
Wolfgang Betz 0:752e74bf5ef1 161 #endif
Wolfgang Betz 9:c4c2240e06d6 162 }
Wolfgang Betz 0:752e74bf5ef1 163
Wolfgang Betz 9:c4c2240e06d6 164 void I2S::abort_all_transfers()
Wolfgang Betz 9:c4c2240e06d6 165 {
Wolfgang Betz 9:c4c2240e06d6 166 lock();
Wolfgang Betz 9:c4c2240e06d6 167 clear_transfer_buffer();
Wolfgang Betz 9:c4c2240e06d6 168 abort_transfer();
Wolfgang Betz 9:c4c2240e06d6 169 unlock();
Wolfgang Betz 9:c4c2240e06d6 170 }
Wolfgang Betz 0:752e74bf5ef1 171
Wolfgang Betz 9:c4c2240e06d6 172 int I2S::get_transfer_status()
Wolfgang Betz 9:c4c2240e06d6 173 {
Wolfgang Betz 9:c4c2240e06d6 174 lock();
Wolfgang Betz 9:c4c2240e06d6 175 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 176 unlock();
Wolfgang Betz 9:c4c2240e06d6 177 return -1;
Wolfgang Betz 9:c4c2240e06d6 178 }
Wolfgang Betz 9:c4c2240e06d6 179 unlock();
Wolfgang Betz 9:c4c2240e06d6 180 return 0;
Wolfgang Betz 0:752e74bf5ef1 181 }
Wolfgang Betz 0:752e74bf5ef1 182
Wolfgang Betz 9:c4c2240e06d6 183 unsigned int I2S::get_module()
Wolfgang Betz 9:c4c2240e06d6 184 {
Wolfgang Betz 9:c4c2240e06d6 185 return i2s_get_module(&_i2s);
Wolfgang Betz 9:c4c2240e06d6 186 }
Wolfgang Betz 0:752e74bf5ef1 187
Wolfgang Betz 9:c4c2240e06d6 188 int I2S::set_dma_priority(i2s_dma_prio_t prio)
Wolfgang Betz 9:c4c2240e06d6 189 {
Wolfgang Betz 9:c4c2240e06d6 190 lock();
Wolfgang Betz 9:c4c2240e06d6 191 if (i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 192 unlock();
Wolfgang Betz 9:c4c2240e06d6 193 return -1;
Wolfgang Betz 9:c4c2240e06d6 194 }
Wolfgang Betz 9:c4c2240e06d6 195 _priority = prio;
Wolfgang Betz 9:c4c2240e06d6 196 unlock();
Wolfgang Betz 9:c4c2240e06d6 197 return 0;
Wolfgang Betz 0:752e74bf5ef1 198 }
Wolfgang Betz 0:752e74bf5ef1 199
Wolfgang Betz 9:c4c2240e06d6 200 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 9:c4c2240e06d6 201 { // betzw: MUST be called with lock held!
Wolfgang Betz 0:752e74bf5ef1 202 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 9:c4c2240e06d6 203 transaction_t t;
Wolfgang Betz 0:752e74bf5ef1 204
Wolfgang Betz 9:c4c2240e06d6 205 t.tx_buffer = const_cast<void *>(tx_buffer);
Wolfgang Betz 9:c4c2240e06d6 206 t.tx_length = tx_length;
Wolfgang Betz 9:c4c2240e06d6 207 t.rx_buffer = rx_buffer;
Wolfgang Betz 9:c4c2240e06d6 208 t.rx_length = rx_length;
Wolfgang Betz 9:c4c2240e06d6 209 t.event = event;
Wolfgang Betz 9:c4c2240e06d6 210 t.callback = callback;
Wolfgang Betz 9:c4c2240e06d6 211 t.width = 16;
Wolfgang Betz 9:c4c2240e06d6 212 Transaction<I2S> transaction(this, t);
Wolfgang Betz 9:c4c2240e06d6 213 core_util_critical_section_enter();
Wolfgang Betz 9:c4c2240e06d6 214 if (_transaction_buffer.full()) {
Wolfgang Betz 9:c4c2240e06d6 215 core_util_critical_section_enter();
Wolfgang Betz 9:c4c2240e06d6 216 return -1; // the buffer is full
Wolfgang Betz 9:c4c2240e06d6 217 } else {
Wolfgang Betz 9:c4c2240e06d6 218 _transaction_buffer.push(transaction);
Wolfgang Betz 9:c4c2240e06d6 219 core_util_critical_section_exit();
Wolfgang Betz 9:c4c2240e06d6 220 // betzw - seems to be redundant - WAS: dequeue_transaction();
Wolfgang Betz 9:c4c2240e06d6 221 return 0;
Wolfgang Betz 9:c4c2240e06d6 222 }
Wolfgang Betz 9:c4c2240e06d6 223 #else
Wolfgang Betz 9:c4c2240e06d6 224 return -1;
Wolfgang Betz 9:c4c2240e06d6 225 #endif
Wolfgang Betz 0:752e74bf5ef1 226 }
Wolfgang Betz 0:752e74bf5ef1 227
Wolfgang Betz 0:752e74bf5ef1 228
Wolfgang Betz 9:c4c2240e06d6 229 // ignore the fact that there are multiple physical i2s's, and always update if it wasn't us last
Wolfgang Betz 9:c4c2240e06d6 230 void I2S::acquire() { // betzw: MUST be called with lock held!
Wolfgang Betz 9:c4c2240e06d6 231 if (_owner != this) {
Wolfgang Betz 9:c4c2240e06d6 232 i2s_format(&_i2s, _dbits, _fbits, _polarity);
Wolfgang Betz 9:c4c2240e06d6 233 i2s_audio_frequency(&_i2s, _hz);
Wolfgang Betz 9:c4c2240e06d6 234 i2s_set_protocol(&_i2s, _protocol);
Wolfgang Betz 9:c4c2240e06d6 235 i2s_set_mode(&_i2s, _mode);
Wolfgang Betz 9:c4c2240e06d6 236 _owner = this;
Wolfgang Betz 9:c4c2240e06d6 237 }
Wolfgang Betz 0:752e74bf5ef1 238 }
Wolfgang Betz 0:752e74bf5ef1 239
Wolfgang Betz 9:c4c2240e06d6 240 void I2S::start_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length,
Wolfgang Betz 9:c4c2240e06d6 241 const event_callback_t& callback, int event)
Wolfgang Betz 9:c4c2240e06d6 242 { // betzw: MUST be called with lock held!
Wolfgang Betz 0:752e74bf5ef1 243 acquire();
Wolfgang Betz 9:c4c2240e06d6 244 _callback = callback;
Wolfgang Betz 9:c4c2240e06d6 245 _irq_tx.callback(&I2S::irq_handler_asynch_tx);
Wolfgang Betz 9:c4c2240e06d6 246 _irq_rx.callback(&I2S::irq_handler_asynch_rx);
Wolfgang Betz 9:c4c2240e06d6 247 i2s_transfer(&_i2s,
Wolfgang Betz 9:c4c2240e06d6 248 const_cast<void *>(tx_buffer), tx_length, rx_buffer, rx_length,
Wolfgang Betz 9:c4c2240e06d6 249 _circular, _priority,
Wolfgang Betz 9:c4c2240e06d6 250 _irq_tx.entry(), _irq_rx.entry(),
Wolfgang Betz 9:c4c2240e06d6 251 event);
Wolfgang Betz 9:c4c2240e06d6 252 }
Wolfgang Betz 0:752e74bf5ef1 253
Wolfgang Betz 0:752e74bf5ef1 254 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 0:752e74bf5ef1 255
Wolfgang Betz 9:c4c2240e06d6 256 void I2S::start_transaction(transaction_t *data)
Wolfgang Betz 9:c4c2240e06d6 257 { // betzw: MUST be called with lock held!
Wolfgang Betz 9:c4c2240e06d6 258 start_transfer(data->tx_buffer, data->tx_length, data->rx_buffer, data->rx_length, data->callback, data->event);
Wolfgang Betz 9:c4c2240e06d6 259 }
Wolfgang Betz 0:752e74bf5ef1 260
Wolfgang Betz 9:c4c2240e06d6 261 void I2S::dequeue_transaction()
Wolfgang Betz 9:c4c2240e06d6 262 {
Wolfgang Betz 9:c4c2240e06d6 263 lock();
Wolfgang Betz 9:c4c2240e06d6 264 if (!i2s_active(&_i2s)) {
Wolfgang Betz 9:c4c2240e06d6 265 Transaction<I2S> t;
Wolfgang Betz 9:c4c2240e06d6 266 if (_transaction_buffer.pop(t)) {
Wolfgang Betz 0:752e74bf5ef1 267 I2S* obj = t.get_object();
Wolfgang Betz 0:752e74bf5ef1 268 transaction_t* data = t.get_transaction();
Wolfgang Betz 0:752e74bf5ef1 269 MBED_ASSERT(obj == this); // betzw: what if 'obj' is NOT equal to 'this'?
Wolfgang Betz 0:752e74bf5ef1 270 obj->start_transaction(data);
Wolfgang Betz 9:c4c2240e06d6 271 }
Wolfgang Betz 9:c4c2240e06d6 272 }
Wolfgang Betz 9:c4c2240e06d6 273 unlock();
Wolfgang Betz 0:752e74bf5ef1 274 }
Wolfgang Betz 0:752e74bf5ef1 275
Wolfgang Betz 0:752e74bf5ef1 276 #endif
Wolfgang Betz 0:752e74bf5ef1 277
Wolfgang Betz 9:c4c2240e06d6 278 void I2S::irq_handler_asynch_rx(void)
Wolfgang Betz 9:c4c2240e06d6 279 {
Wolfgang Betz 9:c4c2240e06d6 280 int event = i2s_irq_handler_asynch(&_i2s, I2S_RX_EVENT);
Wolfgang Betz 9:c4c2240e06d6 281 if (_callback && (event & I2S_EVENT_ALL)) {
Wolfgang Betz 9:c4c2240e06d6 282 I2sBhHandler::i2s_defer_function(_callback, event & I2S_EVENT_ALL);
Wolfgang Betz 9:c4c2240e06d6 283 }
Wolfgang Betz 0:752e74bf5ef1 284 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 9:c4c2240e06d6 285 if (event & I2S_EVENT_INTERNAL_TRANSFER_COMPLETE) {
Wolfgang Betz 9:c4c2240e06d6 286 I2sBhHandler::i2s_defer_function(Callback<void()>(this, &I2S::dequeue_transaction));
Wolfgang Betz 9:c4c2240e06d6 287 }
Wolfgang Betz 0:752e74bf5ef1 288 #endif
Davide Aliprandi 4:21603d68bcf7 289 }
Davide Aliprandi 4:21603d68bcf7 290
Wolfgang Betz 9:c4c2240e06d6 291 void I2S::irq_handler_asynch_tx(void)
Davide Aliprandi 4:21603d68bcf7 292 {
Wolfgang Betz 9:c4c2240e06d6 293 int event = i2s_irq_handler_asynch(&_i2s, I2S_TX_EVENT);
Wolfgang Betz 9:c4c2240e06d6 294 if (_callback && (event & I2S_EVENT_ALL)) {
Wolfgang Betz 9:c4c2240e06d6 295 I2sBhHandler::i2s_defer_function(_callback, event & I2S_EVENT_ALL);
Wolfgang Betz 9:c4c2240e06d6 296 }
Wolfgang Betz 9:c4c2240e06d6 297 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 9:c4c2240e06d6 298 if (event & I2S_EVENT_INTERNAL_TRANSFER_COMPLETE) {
Wolfgang Betz 9:c4c2240e06d6 299 I2sBhHandler::i2s_defer_function(Callback<void()>(this, &I2S::dequeue_transaction));
Wolfgang Betz 9:c4c2240e06d6 300 }
Wolfgang Betz 9:c4c2240e06d6 301 #endif
Davide Aliprandi 4:21603d68bcf7 302 }
Davide Aliprandi 4:21603d68bcf7 303
Wolfgang Betz 0:752e74bf5ef1 304 } // namespace mbed
Wolfgang Betz 0:752e74bf5ef1 305
Wolfgang Betz 0:752e74bf5ef1 306 #endif