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drivers/I2S.h@10:1a612c2e4a85, 2016-12-22 (annotated)

Committer:
Wolfgang Betz
Date:
Thu Dec 22 12:02:24 2016 +0100
Revision:
10:1a612c2e4a85
Parent:
9:c4c2240e06d6
Child:
13:fa1b24df9025
Make driver mbed-classic compatible

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Wolfgang Betz 0:752e74bf5ef1 1 #ifndef MBED_I2S_H
Wolfgang Betz 0:752e74bf5ef1 2 #define MBED_I2S_H
Wolfgang Betz 0:752e74bf5ef1 3
Wolfgang Betz 0:752e74bf5ef1 4 #include "platform/platform.h"
Wolfgang Betz 0:752e74bf5ef1 5
Wolfgang Betz 0:752e74bf5ef1 6 #if DEVICE_I2S
Wolfgang Betz 0:752e74bf5ef1 7
Wolfgang Betz 0:752e74bf5ef1 8 #include "platform/PlatformMutex.h"
Wolfgang Betz 1:f90318e0923b 9 #include "hal/stm_i2s_api.h"
Wolfgang Betz 0:752e74bf5ef1 10 #include "platform/SingletonPtr.h"
Wolfgang Betz 0:752e74bf5ef1 11
Wolfgang Betz 0:752e74bf5ef1 12 #include "platform/CThunk.h"
Wolfgang Betz 1:f90318e0923b 13 #include "hal/stm_dma_api.h"
Wolfgang Betz 0:752e74bf5ef1 14 #include "platform/CircularBuffer.h"
Wolfgang Betz 0:752e74bf5ef1 15 #include "platform/FunctionPointer.h"
Wolfgang Betz 0:752e74bf5ef1 16 #include "platform/Transaction.h"
Wolfgang Betz 0:752e74bf5ef1 17
Wolfgang Betz 0:752e74bf5ef1 18 #include "events/EventQueue.h"
Wolfgang Betz 0:752e74bf5ef1 19
Wolfgang Betz 0:752e74bf5ef1 20 namespace mbed {
Wolfgang Betz 0:752e74bf5ef1 21
Wolfgang Betz 0:752e74bf5ef1 22 /** A I2S Master/Slave, used for communicating with I2S slave/master devices
Wolfgang Betz 0:752e74bf5ef1 23 *
Wolfgang Betz 0:752e74bf5ef1 24 * The default format is set to master transmission mode, one-shot (i.e. not circular)
Wolfgang Betz 0:752e74bf5ef1 25 * 16 data bits & 16 bits per frame, clock polarity 0,
Wolfgang Betz 0:752e74bf5ef1 26 * protocol PHILIPS, and a clock frequency of 44.1kHz
Wolfgang Betz 0:752e74bf5ef1 27 *
Wolfgang Betz 0:752e74bf5ef1 28 * TODO: "direct" PDM support
Wolfgang Betz 0:752e74bf5ef1 29 *
Wolfgang Betz 0:752e74bf5ef1 30 * Most I2S devices will also require Reset signals. These
Wolfgang Betz 0:752e74bf5ef1 31 * can be controlled using <DigitalOut> pins
Wolfgang Betz 0:752e74bf5ef1 32 *
Wolfgang Betz 0:752e74bf5ef1 33 * @Note Synchronization level: Thread safe
Wolfgang Betz 0:752e74bf5ef1 34 *
Wolfgang Betz 0:752e74bf5ef1 35 */
Wolfgang Betz 10:1a612c2e4a85 36 class I2S {
Wolfgang Betz 0:752e74bf5ef1 37
Wolfgang Betz 10:1a612c2e4a85 38 public:
Wolfgang Betz 10:1a612c2e4a85 39 /** Create a I2S master connected to the specified pins
Wolfgang Betz 10:1a612c2e4a85 40 *
Wolfgang Betz 10:1a612c2e4a85 41 * @param dpin I2S data input/output pin
Wolfgang Betz 10:1a612c2e4a85 42 * @param clk I2S clock output pin
Wolfgang Betz 10:1a612c2e4a85 43 * @param wsel I2S word select output pin (might be NC for PDM sources)
Wolfgang Betz 10:1a612c2e4a85 44 * @param fdpin I2S data input pin (for full-duplex operation, default = NC)
Wolfgang Betz 10:1a612c2e4a85 45 * @param mck I2S master clock output (additional pin when needed for some external audio devices, default = NC)
Wolfgang Betz 10:1a612c2e4a85 46 *
Wolfgang Betz 10:1a612c2e4a85 47 * @Note It is up to the application programmer to not generate at the same time two I2S instances with the
Wolfgang Betz 10:1a612c2e4a85 48 * same pin (NC excluded) for one of the parameters, otherwise the correct operation of this class cannot be
Wolfgang Betz 10:1a612c2e4a85 49 * guaranteed (e.g. things like SPI/I2S clock enabling and above all disabling might not work correctly)!
Wolfgang Betz 10:1a612c2e4a85 50 */
Wolfgang Betz 10:1a612c2e4a85 51 I2S(PinName dpin, PinName clk, PinName wsel, PinName fdpin = NC, PinName mck = NC);
Wolfgang Betz 0:752e74bf5ef1 52
Wolfgang Betz 10:1a612c2e4a85 53 /** Configure the data transmission format
Wolfgang Betz 10:1a612c2e4a85 54 *
Wolfgang Betz 10:1a612c2e4a85 55 * @param dbits Number of data bits per I2S frame (16, 24, or 32)
Wolfgang Betz 10:1a612c2e4a85 56 * @param fbits Number of bits per I2S frame (16 or 32)
Wolfgang Betz 10:1a612c2e4a85 57 * @param polarity Clock polarity (either 0/low or 1/high, default = 0)
Wolfgang Betz 10:1a612c2e4a85 58 * @return Zero if the usage was set, -1 if a transaction is on-going
Wolfgang Betz 10:1a612c2e4a85 59 */
Wolfgang Betz 10:1a612c2e4a85 60 int format(int dbits, int fbits, int polarity = 0);
Wolfgang Betz 0:752e74bf5ef1 61
Wolfgang Betz 10:1a612c2e4a85 62 /** Set the i2s audio frequency
Wolfgang Betz 10:1a612c2e4a85 63 *
Wolfgang Betz 10:1a612c2e4a85 64 * @param hz audio frequency in hz
Wolfgang Betz 10:1a612c2e4a85 65 * @return Zero if the usage was set, -1 if a transaction is on-going
Wolfgang Betz 10:1a612c2e4a85 66 */
Wolfgang Betz 10:1a612c2e4a85 67 int audio_frequency(unsigned int hz);
Wolfgang Betz 0:752e74bf5ef1 68
Wolfgang Betz 10:1a612c2e4a85 69 /** Set the i2s bus protocol
Wolfgang Betz 10:1a612c2e4a85 70 *
Wolfgang Betz 10:1a612c2e4a85 71 * @param protocol I2S protocol to be used
Wolfgang Betz 10:1a612c2e4a85 72 * @return Zero if the usage was set, -1 if a transaction is on-going
Wolfgang Betz 10:1a612c2e4a85 73 */
Wolfgang Betz 10:1a612c2e4a85 74 int set_protocol(i2s_bitorder_t protocol);
Wolfgang Betz 0:752e74bf5ef1 75
Wolfgang Betz 10:1a612c2e4a85 76 /** Set the i2s mode
Wolfgang Betz 10:1a612c2e4a85 77 *
Wolfgang Betz 10:1a612c2e4a85 78 * @param mode I2S mode to be used
Wolfgang Betz 10:1a612c2e4a85 79 * @param circular I2S should read/write buffers continuously (in circular mode)
Wolfgang Betz 10:1a612c2e4a85 80 * @return Zero if the usage was set, -1 if a transaction is on-going
Wolfgang Betz 10:1a612c2e4a85 81 */
Wolfgang Betz 10:1a612c2e4a85 82 int set_mode(i2s_mode_t mode, bool circular);
Wolfgang Betz 0:752e74bf5ef1 83
Wolfgang Betz 10:1a612c2e4a85 84 /** Start non-blocking I2S transfer as configured with above methods
Wolfgang Betz 10:1a612c2e4a85 85 *
Wolfgang Betz 10:1a612c2e4a85 86 * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
Wolfgang Betz 10:1a612c2e4a85 87 * no transmission will be set up
Wolfgang Betz 10:1a612c2e4a85 88 * @param tx_length The length of TX buffer in bytes
Wolfgang Betz 10:1a612c2e4a85 89 * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
Wolfgang Betz 10:1a612c2e4a85 90 * received data will be ignored
Wolfgang Betz 10:1a612c2e4a85 91 * @param rx_length The length of RX buffer in bytes
Wolfgang Betz 10:1a612c2e4a85 92 * @param callback The event callback function
Wolfgang Betz 10:1a612c2e4a85 93 * @param event The logical OR of events to notify. Look at i2s hal header file for I2S events.
Wolfgang Betz 10:1a612c2e4a85 94 * @return Zero if the transfer has started (or been queued), or
Wolfgang Betz 10:1a612c2e4a85 95 * -1 if I2S peripheral is busy (or out of resources)
Wolfgang Betz 10:1a612c2e4a85 96 */
Wolfgang Betz 10:1a612c2e4a85 97 template<typename Type>
Wolfgang Betz 10:1a612c2e4a85 98 int transfer(const Type *tx_buffer, int tx_length, Type *rx_buffer, int rx_length, const event_callback_t& callback, int event) {
Wolfgang Betz 10:1a612c2e4a85 99 int ret = 0;
Wolfgang Betz 0:752e74bf5ef1 100
Wolfgang Betz 10:1a612c2e4a85 101 lock();
Wolfgang Betz 10:1a612c2e4a85 102
Wolfgang Betz 10:1a612c2e4a85 103 if (i2s_active(&_i2s)
Wolfgang Betz 0:752e74bf5ef1 104 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 10:1a612c2e4a85 105 || !_transaction_buffer.empty()
Wolfgang Betz 0:752e74bf5ef1 106 #endif
Wolfgang Betz 10:1a612c2e4a85 107 ) {
Wolfgang Betz 10:1a612c2e4a85 108 ret = queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, callback, event);
Wolfgang Betz 10:1a612c2e4a85 109 } else {
Wolfgang Betz 10:1a612c2e4a85 110 start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, callback, event);
Wolfgang Betz 9:c4c2240e06d6 111 }
Wolfgang Betz 10:1a612c2e4a85 112
Wolfgang Betz 10:1a612c2e4a85 113 unlock();
Wolfgang Betz 10:1a612c2e4a85 114 return ret;
Wolfgang Betz 10:1a612c2e4a85 115 }
Wolfgang Betz 0:752e74bf5ef1 116
Wolfgang Betz 10:1a612c2e4a85 117 /** Acquire exclusive access to this I2S bus
Wolfgang Betz 10:1a612c2e4a85 118 */
Wolfgang Betz 10:1a612c2e4a85 119 virtual void lock(void);
Wolfgang Betz 0:752e74bf5ef1 120
Wolfgang Betz 10:1a612c2e4a85 121 /** Release exclusive access to this I2S bus
Wolfgang Betz 10:1a612c2e4a85 122 */
Wolfgang Betz 10:1a612c2e4a85 123 virtual void unlock(void);
Wolfgang Betz 0:752e74bf5ef1 124
Wolfgang Betz 10:1a612c2e4a85 125 /** Abort the on-going I2S transfer, and continue with transfer's in the queue if any.
Wolfgang Betz 10:1a612c2e4a85 126 */
Wolfgang Betz 10:1a612c2e4a85 127 void abort_transfer();
Wolfgang Betz 0:752e74bf5ef1 128
Wolfgang Betz 10:1a612c2e4a85 129 /** Clear the transaction buffer
Wolfgang Betz 10:1a612c2e4a85 130 */
Wolfgang Betz 10:1a612c2e4a85 131 void clear_transfer_buffer();
Wolfgang Betz 0:752e74bf5ef1 132
Wolfgang Betz 10:1a612c2e4a85 133 /** Clear the transaction buffer and abort on-going transfer.
Wolfgang Betz 10:1a612c2e4a85 134 */
Wolfgang Betz 10:1a612c2e4a85 135 void abort_all_transfers();
Wolfgang Betz 0:752e74bf5ef1 136
Wolfgang Betz 10:1a612c2e4a85 137 /** Get transfer status
Wolfgang Betz 10:1a612c2e4a85 138 *
Wolfgang Betz 10:1a612c2e4a85 139 * @return -1 if a transaction is on-going, zero otherwise
Wolfgang Betz 10:1a612c2e4a85 140 */
Wolfgang Betz 10:1a612c2e4a85 141 int get_transfer_status();
Wolfgang Betz 0:752e74bf5ef1 142
Wolfgang Betz 10:1a612c2e4a85 143 /** Get internal module id
Wolfgang Betz 10:1a612c2e4a85 144 *
Wolfgang Betz 10:1a612c2e4a85 145 * @return internal module id
Wolfgang Betz 10:1a612c2e4a85 146 */
Wolfgang Betz 10:1a612c2e4a85 147 unsigned int get_module();
Wolfgang Betz 0:752e74bf5ef1 148
Wolfgang Betz 10:1a612c2e4a85 149 /** Configure DMA priority for transfers
Wolfgang Betz 10:1a612c2e4a85 150 *
Wolfgang Betz 10:1a612c2e4a85 151 * @param prio The DMA priority to be used
Wolfgang Betz 10:1a612c2e4a85 152 * @return Zero if the usage was set, -1 if a transaction is on-going
Wolfgang Betz 10:1a612c2e4a85 153 */
Wolfgang Betz 10:1a612c2e4a85 154 int set_dma_priority(i2s_dma_prio_t prio);
Davide Aliprandi 4:21603d68bcf7 155
Wolfgang Betz 10:1a612c2e4a85 156 /** Harmonize the frequencies of the given I2S objects so that they are
Wolfgang Betz 10:1a612c2e4a85 157 * exact multiple one of the other. It can be useful whenever two I2S
Wolfgang Betz 10:1a612c2e4a85 158 * peripherals have to work together and no drift is allowed between them.
Wolfgang Betz 10:1a612c2e4a85 159 *
Wolfgang Betz 10:1a612c2e4a85 160 * @param dev_i2s_1 reference to the first I2S object.
Wolfgang Betz 10:1a612c2e4a85 161 * @param dev_i2s_2 reference to the second I2S object.
Wolfgang Betz 10:1a612c2e4a85 162 * @return Zero if the frequencies have been harmonized correctly, -1
Wolfgang Betz 10:1a612c2e4a85 163 * otherwise.
Wolfgang Betz 10:1a612c2e4a85 164 */
Wolfgang Betz 10:1a612c2e4a85 165 static int harmonize(I2S &dev_i2s_1, I2S &dev_i2s_2);
Wolfgang Betz 0:752e74bf5ef1 166
Wolfgang Betz 0:752e74bf5ef1 167
Wolfgang Betz 10:1a612c2e4a85 168 /** Bottom-half & transactions event queue for all I2S objects
Wolfgang Betz 10:1a612c2e4a85 169 * Must be used by application programmer to schedule/execute bottom-halves
Wolfgang Betz 10:1a612c2e4a85 170 * (i.e. transfer event callback functions) and automatically start queued
Wolfgang Betz 10:1a612c2e4a85 171 * transactions (i.e. transfers), e.g. by calling `events::EventQueue::dispatch_forever()`! */
Wolfgang Betz 10:1a612c2e4a85 172 static events::EventQueue i2s_bh_queue;
Wolfgang Betz 10:1a612c2e4a85 173
Wolfgang Betz 10:1a612c2e4a85 174 protected:
Wolfgang Betz 10:1a612c2e4a85 175 /** I2S TX DMA IRQ handler
Wolfgang Betz 10:1a612c2e4a85 176 *
Wolfgang Betz 10:1a612c2e4a85 177 */
Wolfgang Betz 10:1a612c2e4a85 178 void irq_handler_asynch_tx(void);
Wolfgang Betz 0:752e74bf5ef1 179
Wolfgang Betz 10:1a612c2e4a85 180 /** I2S RX DMA IRQ handler
Wolfgang Betz 10:1a612c2e4a85 181 *
Wolfgang Betz 10:1a612c2e4a85 182 */
Wolfgang Betz 10:1a612c2e4a85 183 void irq_handler_asynch_rx(void);
Wolfgang Betz 0:752e74bf5ef1 184
Wolfgang Betz 10:1a612c2e4a85 185 /** Add a transfer to the queue
Wolfgang Betz 10:1a612c2e4a85 186 * @param data Transaction data
Wolfgang Betz 10:1a612c2e4a85 187 * @return Zero if a transfer was added to the queue, or -1 if the queue is full
Wolfgang Betz 10:1a612c2e4a85 188 */
Wolfgang Betz 10:1a612c2e4a85 189 int queue_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length,
Wolfgang Betz 10:1a612c2e4a85 190 const event_callback_t& callback, int event);
Wolfgang Betz 10:1a612c2e4a85 191
Wolfgang Betz 10:1a612c2e4a85 192 /** Configures a callback, i2s peripheral and initiate a new transfer
Wolfgang Betz 10:1a612c2e4a85 193 *
Wolfgang Betz 10:1a612c2e4a85 194 * @param data Transaction data
Wolfgang Betz 10:1a612c2e4a85 195 */
Wolfgang Betz 10:1a612c2e4a85 196 void start_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length,
Wolfgang Betz 10:1a612c2e4a85 197 const event_callback_t& callback, int event);
Wolfgang Betz 0:752e74bf5ef1 198
Wolfgang Betz 10:1a612c2e4a85 199 class I2sBhHandler {
Wolfgang Betz 10:1a612c2e4a85 200 friend class I2S;
Wolfgang Betz 0:752e74bf5ef1 201
Wolfgang Betz 10:1a612c2e4a85 202 static void i2s_defer_function(const event_callback_t& bottom_half, int event) {
Wolfgang Betz 10:1a612c2e4a85 203 i2s_bh_queue.call(bottom_half, event);
Wolfgang Betz 10:1a612c2e4a85 204 }
Wolfgang Betz 0:752e74bf5ef1 205
Wolfgang Betz 10:1a612c2e4a85 206 static void i2s_defer_function(const Callback<void()>& bottom_half) {
Wolfgang Betz 10:1a612c2e4a85 207 i2s_bh_queue.call(bottom_half);
Wolfgang Betz 10:1a612c2e4a85 208 }
Wolfgang Betz 10:1a612c2e4a85 209 };
Wolfgang Betz 0:752e74bf5ef1 210
Wolfgang Betz 0:752e74bf5ef1 211 #if TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 10:1a612c2e4a85 212 /** Start a new transaction
Wolfgang Betz 10:1a612c2e4a85 213 *
Wolfgang Betz 10:1a612c2e4a85 214 * @param data Transaction data
Wolfgang Betz 10:1a612c2e4a85 215 */
Wolfgang Betz 10:1a612c2e4a85 216 void start_transaction(transaction_t *data);
Wolfgang Betz 0:752e74bf5ef1 217
Wolfgang Betz 10:1a612c2e4a85 218 /** Dequeue a transaction
Wolfgang Betz 10:1a612c2e4a85 219 *
Wolfgang Betz 10:1a612c2e4a85 220 */
Wolfgang Betz 10:1a612c2e4a85 221 void dequeue_transaction();
Wolfgang Betz 0:752e74bf5ef1 222
Wolfgang Betz 10:1a612c2e4a85 223 /* betzw - WAS : static */ CircularBuffer<Transaction<I2S>, TRANSACTION_QUEUE_SIZE_I2S> _transaction_buffer;
Wolfgang Betz 0:752e74bf5ef1 224 #endif // TRANSACTION_QUEUE_SIZE_I2S
Wolfgang Betz 0:752e74bf5ef1 225
Wolfgang Betz 10:1a612c2e4a85 226 public:
Wolfgang Betz 10:1a612c2e4a85 227 virtual ~I2S() {
Wolfgang Betz 10:1a612c2e4a85 228 /* betzw - TODO: cleanup has still to be revised completely! */
Wolfgang Betz 10:1a612c2e4a85 229 abort_all_transfers();
Wolfgang Betz 10:1a612c2e4a85 230 i2s_free(&_i2s);
Wolfgang Betz 10:1a612c2e4a85 231 }
Davide Aliprandi 4:21603d68bcf7 232
Wolfgang Betz 10:1a612c2e4a85 233 protected:
Wolfgang Betz 10:1a612c2e4a85 234 i2s_t _i2s;
Davide Aliprandi 4:21603d68bcf7 235
Wolfgang Betz 10:1a612c2e4a85 236 CThunk<I2S> _irq_tx;
Wolfgang Betz 10:1a612c2e4a85 237 CThunk<I2S> _irq_rx;
Wolfgang Betz 10:1a612c2e4a85 238 event_callback_t _callback;
Wolfgang Betz 10:1a612c2e4a85 239 i2s_dma_prio_t _priority; // DMA priority
Wolfgang Betz 0:752e74bf5ef1 240
Wolfgang Betz 10:1a612c2e4a85 241 void acquire(void);
Wolfgang Betz 0:752e74bf5ef1 242
Wolfgang Betz 10:1a612c2e4a85 243 static I2S *_owner;
Wolfgang Betz 10:1a612c2e4a85 244 static SingletonPtr<PlatformMutex> _mutex;
Wolfgang Betz 0:752e74bf5ef1 245
Wolfgang Betz 10:1a612c2e4a85 246 int _dbits;
Wolfgang Betz 10:1a612c2e4a85 247 int _fbits;
Wolfgang Betz 10:1a612c2e4a85 248 int _polarity;
Wolfgang Betz 10:1a612c2e4a85 249 i2s_bitorder_t _protocol;
Wolfgang Betz 10:1a612c2e4a85 250 i2s_mode_t _mode;
Wolfgang Betz 10:1a612c2e4a85 251 bool _circular;
Wolfgang Betz 10:1a612c2e4a85 252 unsigned int _hz;
Wolfgang Betz 10:1a612c2e4a85 253 };
Wolfgang Betz 0:752e74bf5ef1 254
Wolfgang Betz 0:752e74bf5ef1 255 } // namespace mbed
Wolfgang Betz 0:752e74bf5ef1 256
Wolfgang Betz 0:752e74bf5ef1 257 #endif
Wolfgang Betz 0:752e74bf5ef1 258
Wolfgang Betz 0:752e74bf5ef1 259 #endif