mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

drivers/SPI.h@188:bcfe06ba3d64, 2018-11-08 (annotated)

Committer:
AnnaBridge
Date:
Thu Nov 08 11:46:34 2018 +0000
Revision:
188:bcfe06ba3d64
Parent:
187:0387e8f68319
Child:
189:f392fc9709a3
mbed-dev library. Release version 164

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2006-2015 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #ifndef MBED_SPI_H
<> 149:156823d33999 17 #define MBED_SPI_H
<> 149:156823d33999 18
<> 149:156823d33999 19 #include "platform/platform.h"
<> 149:156823d33999 20
AnnaBridge 167:e84263d55307 21 #if defined (DEVICE_SPI) || defined(DOXYGEN_ONLY)
<> 149:156823d33999 22
<> 149:156823d33999 23 #include "platform/PlatformMutex.h"
<> 149:156823d33999 24 #include "hal/spi_api.h"
<> 149:156823d33999 25 #include "platform/SingletonPtr.h"
AnnaBridge 168:9672193075cf 26 #include "platform/NonCopyable.h"
<> 149:156823d33999 27
<> 149:156823d33999 28 #if DEVICE_SPI_ASYNCH
<> 149:156823d33999 29 #include "platform/CThunk.h"
<> 149:156823d33999 30 #include "hal/dma_api.h"
<> 149:156823d33999 31 #include "platform/CircularBuffer.h"
<> 149:156823d33999 32 #include "platform/FunctionPointer.h"
<> 149:156823d33999 33 #include "platform/Transaction.h"
<> 149:156823d33999 34 #endif
<> 149:156823d33999 35
<> 149:156823d33999 36 namespace mbed {
<> 149:156823d33999 37 /** \addtogroup drivers */
<> 149:156823d33999 38
AnnaBridge 188:bcfe06ba3d64 39 /** A SPI Master, used for communicating with SPI slave devices.
<> 149:156823d33999 40 *
AnnaBridge 188:bcfe06ba3d64 41 * The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz.
<> 149:156823d33999 42 *
<> 149:156823d33999 43 * Most SPI devices will also require Chip Select and Reset signals. These
AnnaBridge 188:bcfe06ba3d64 44 * can be controlled using DigitalOut pins.
<> 149:156823d33999 45 *
AnnaBridge 167:e84263d55307 46 * @note Synchronization level: Thread safe
<> 149:156823d33999 47 *
AnnaBridge 188:bcfe06ba3d64 48 * Example of how to send a byte to a SPI slave and record the response:
<> 149:156823d33999 49 * @code
<> 149:156823d33999 50 * #include "mbed.h"
<> 149:156823d33999 51 *
AnnaBridge 188:bcfe06ba3d64 52 * SPI device(SPI_MOSI, SPI_MISO, SPI_SCLK)
<> 149:156823d33999 53 *
AnnaBridge 188:bcfe06ba3d64 54 * DigitalOut chip_select(SPI_CS);
<> 149:156823d33999 55 *
<> 149:156823d33999 56 * int main() {
<> 149:156823d33999 57 * device.lock();
AnnaBridge 188:bcfe06ba3d64 58 * chip_select = 0;
AnnaBridge 188:bcfe06ba3d64 59 *
<> 149:156823d33999 60 * int response = device.write(0xFF);
AnnaBridge 188:bcfe06ba3d64 61 *
AnnaBridge 188:bcfe06ba3d64 62 * chip_select = 1;
<> 149:156823d33999 63 * device.unlock();
AnnaBridge 188:bcfe06ba3d64 64 * }
AnnaBridge 188:bcfe06ba3d64 65 * @endcode
<> 149:156823d33999 66 *
AnnaBridge 188:bcfe06ba3d64 67 * Example using hardware Chip Select line:
AnnaBridge 188:bcfe06ba3d64 68 * @code
AnnaBridge 188:bcfe06ba3d64 69 * #include "mbed.h"
AnnaBridge 188:bcfe06ba3d64 70 *
AnnaBridge 188:bcfe06ba3d64 71 * SPI device(SPI_MOSI, SPI_MISO, SPI_SCLK, SPI_CS)
AnnaBridge 188:bcfe06ba3d64 72 *
AnnaBridge 188:bcfe06ba3d64 73 * int main() {
AnnaBridge 188:bcfe06ba3d64 74 * device.lock();
AnnaBridge 188:bcfe06ba3d64 75 * int response = device.write(0xFF);
AnnaBridge 188:bcfe06ba3d64 76 * device.unlock();
<> 149:156823d33999 77 * }
<> 149:156823d33999 78 * @endcode
AnnaBridge 167:e84263d55307 79 * @ingroup drivers
<> 149:156823d33999 80 */
AnnaBridge 168:9672193075cf 81 class SPI : private NonCopyable<SPI> {
<> 149:156823d33999 82
<> 149:156823d33999 83 public:
<> 149:156823d33999 84
AnnaBridge 188:bcfe06ba3d64 85 /** Create a SPI master connected to the specified pins.
<> 149:156823d33999 86 *
AnnaBridge 188:bcfe06ba3d64 87 * @note You can specify mosi or miso as NC if not used.
<> 149:156823d33999 88 *
AnnaBridge 188:bcfe06ba3d64 89 * @param mosi SPI Master Out, Slave In pin.
AnnaBridge 188:bcfe06ba3d64 90 * @param miso SPI Master In, Slave Out pin.
AnnaBridge 188:bcfe06ba3d64 91 * @param sclk SPI Clock pin.
AnnaBridge 188:bcfe06ba3d64 92 * @param ssel SPI Chip Select pin.
<> 149:156823d33999 93 */
AnnaBridge 187:0387e8f68319 94 SPI(PinName mosi, PinName miso, PinName sclk, PinName ssel = NC);
AnnaBridge 188:bcfe06ba3d64 95 virtual ~SPI();
<> 149:156823d33999 96
AnnaBridge 188:bcfe06ba3d64 97 /** Configure the data transmission format.
<> 149:156823d33999 98 *
AnnaBridge 188:bcfe06ba3d64 99 * @param bits Number of bits per SPI frame (4 - 16).
AnnaBridge 188:bcfe06ba3d64 100 * @param mode Clock polarity and phase mode (0 - 3).
<> 149:156823d33999 101 *
<> 149:156823d33999 102 * @code
<> 149:156823d33999 103 * mode | POL PHA
<> 149:156823d33999 104 * -----+--------
<> 149:156823d33999 105 * 0 | 0 0
<> 149:156823d33999 106 * 1 | 0 1
<> 149:156823d33999 107 * 2 | 1 0
<> 149:156823d33999 108 * 3 | 1 1
<> 149:156823d33999 109 * @endcode
<> 149:156823d33999 110 */
<> 149:156823d33999 111 void format(int bits, int mode = 0);
<> 149:156823d33999 112
AnnaBridge 188:bcfe06ba3d64 113 /** Set the SPI bus clock frequency.
<> 149:156823d33999 114 *
AnnaBridge 188:bcfe06ba3d64 115 * @param hz Clock frequency in Hz (default = 1MHz).
<> 149:156823d33999 116 */
<> 149:156823d33999 117 void frequency(int hz = 1000000);
<> 149:156823d33999 118
AnnaBridge 188:bcfe06ba3d64 119 /** Write to the SPI Slave and return the response.
<> 149:156823d33999 120 *
AnnaBridge 188:bcfe06ba3d64 121 * @param value Data to be sent to the SPI slave.
<> 149:156823d33999 122 *
AnnaBridge 188:bcfe06ba3d64 123 * @return Response from the SPI slave.
AnnaBridge 167:e84263d55307 124 */
<> 149:156823d33999 125 virtual int write(int value);
<> 149:156823d33999 126
AnnaBridge 188:bcfe06ba3d64 127 /** Write to the SPI Slave and obtain the response.
AnnaBridge 167:e84263d55307 128 *
AnnaBridge 184:08ed48f1de7f 129 * The total number of bytes sent and received will be the maximum of
AnnaBridge 167:e84263d55307 130 * tx_length and rx_length. The bytes written will be padded with the
AnnaBridge 167:e84263d55307 131 * value 0xff.
AnnaBridge 167:e84263d55307 132 *
AnnaBridge 188:bcfe06ba3d64 133 * @param tx_buffer Pointer to the byte-array of data to write to the device.
AnnaBridge 188:bcfe06ba3d64 134 * @param tx_length Number of bytes to write, may be zero.
AnnaBridge 188:bcfe06ba3d64 135 * @param rx_buffer Pointer to the byte-array of data to read from the device.
AnnaBridge 188:bcfe06ba3d64 136 * @param rx_length Number of bytes to read, may be zero.
AnnaBridge 188:bcfe06ba3d64 137 * @return
AnnaBridge 167:e84263d55307 138 * The number of bytes written and read from the device. This is
AnnaBridge 167:e84263d55307 139 * maximum of tx_length and rx_length.
AnnaBridge 167:e84263d55307 140 */
AnnaBridge 167:e84263d55307 141 virtual int write(const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length);
AnnaBridge 167:e84263d55307 142
AnnaBridge 188:bcfe06ba3d64 143 /** Acquire exclusive access to this SPI bus.
<> 149:156823d33999 144 */
<> 149:156823d33999 145 virtual void lock(void);
<> 149:156823d33999 146
AnnaBridge 188:bcfe06ba3d64 147 /** Release exclusive access to this SPI bus.
<> 149:156823d33999 148 */
<> 149:156823d33999 149 virtual void unlock(void);
<> 149:156823d33999 150
AnnaBridge 188:bcfe06ba3d64 151 /** Set default write data.
Kojto 170:19eb464bc2be 152 * SPI requires the master to send some data during a read operation.
Kojto 170:19eb464bc2be 153 * Different devices may require different default byte values.
Kojto 170:19eb464bc2be 154 * For example: A SD Card requires default bytes to be 0xFF.
Kojto 170:19eb464bc2be 155 *
AnnaBridge 188:bcfe06ba3d64 156 * @param data Default character to be transmitted during a read operation.
Kojto 170:19eb464bc2be 157 */
Kojto 170:19eb464bc2be 158 void set_default_write_value(char data);
Kojto 170:19eb464bc2be 159
<> 149:156823d33999 160 #if DEVICE_SPI_ASYNCH
<> 149:156823d33999 161
<> 149:156823d33999 162 /** Start non-blocking SPI transfer using 8bit buffers.
<> 149:156823d33999 163 *
AnnaBridge 188:bcfe06ba3d64 164 * This function locks the deep sleep until any event has occurred.
AnnaBridge 187:0387e8f68319 165 *
AnnaBridge 188:bcfe06ba3d64 166 * @param tx_buffer The TX buffer with data to be transferred. If NULL is passed,
AnnaBridge 188:bcfe06ba3d64 167 * the default SPI value is sent.
AnnaBridge 188:bcfe06ba3d64 168 * @param tx_length The length of TX buffer in bytes.
<> 149:156823d33999 169 * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
AnnaBridge 188:bcfe06ba3d64 170 * received data are ignored.
AnnaBridge 188:bcfe06ba3d64 171 * @param rx_length The length of RX buffer in bytes.
AnnaBridge 188:bcfe06ba3d64 172 * @param callback The event callback function.
AnnaBridge 188:bcfe06ba3d64 173 * @param event The event mask of events to modify. @see spi_api.h for SPI events.
AnnaBridge 188:bcfe06ba3d64 174 *
AnnaBridge 188:bcfe06ba3d64 175 * @return Operation result.
AnnaBridge 188:bcfe06ba3d64 176 * @retval 0 If the transfer has started.
AnnaBridge 188:bcfe06ba3d64 177 * @retval -1 If SPI peripheral is busy.
<> 149:156823d33999 178 */
<> 149:156823d33999 179 template<typename Type>
AnnaBridge 187:0387e8f68319 180 int transfer(const Type *tx_buffer, int tx_length, Type *rx_buffer, int rx_length, const event_callback_t &callback, int event = SPI_EVENT_COMPLETE)
AnnaBridge 187:0387e8f68319 181 {
<> 149:156823d33999 182 if (spi_active(&_spi)) {
AnnaBridge 187:0387e8f68319 183 return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, sizeof(Type) * 8, callback, event);
<> 149:156823d33999 184 }
AnnaBridge 187:0387e8f68319 185 start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, sizeof(Type) * 8, callback, event);
<> 149:156823d33999 186 return 0;
<> 149:156823d33999 187 }
<> 149:156823d33999 188
AnnaBridge 188:bcfe06ba3d64 189 /** Abort the on-going SPI transfer, and continue with transfers in the queue, if any.
<> 149:156823d33999 190 */
<> 149:156823d33999 191 void abort_transfer();
<> 149:156823d33999 192
AnnaBridge 188:bcfe06ba3d64 193 /** Clear the queue of transfers.
<> 149:156823d33999 194 */
<> 149:156823d33999 195 void clear_transfer_buffer();
<> 149:156823d33999 196
AnnaBridge 188:bcfe06ba3d64 197 /** Clear the queue of transfers and abort the on-going transfer.
<> 149:156823d33999 198 */
<> 149:156823d33999 199 void abort_all_transfers();
<> 149:156823d33999 200
AnnaBridge 188:bcfe06ba3d64 201 /** Configure DMA usage suggestion for non-blocking transfers.
AnnaBridge 188:bcfe06ba3d64 202 *
AnnaBridge 188:bcfe06ba3d64 203 * @param usage The usage DMA hint for peripheral.
<> 149:156823d33999 204 *
AnnaBridge 188:bcfe06ba3d64 205 * @return Result of the operation.
AnnaBridge 188:bcfe06ba3d64 206 * @retval 0 The usage was set.
AnnaBridge 188:bcfe06ba3d64 207 * @retval -1 Usage cannot be set as there is an ongoing transaction.
AnnaBridge 188:bcfe06ba3d64 208 */
<> 149:156823d33999 209 int set_dma_usage(DMAUsage usage);
<> 149:156823d33999 210
<> 149:156823d33999 211 protected:
AnnaBridge 188:bcfe06ba3d64 212 /** SPI interrupt handler.
AnnaBridge 188:bcfe06ba3d64 213 */
<> 149:156823d33999 214 void irq_handler_asynch(void);
<> 149:156823d33999 215
AnnaBridge 188:bcfe06ba3d64 216 /** Start the transfer or put it on the queue.
<> 149:156823d33999 217 *
AnnaBridge 188:bcfe06ba3d64 218 * @param tx_buffer The TX buffer with data to be transferred. If NULL is passed,
<> 149:156823d33999 219 * the default SPI value is sent
AnnaBridge 188:bcfe06ba3d64 220 * @param tx_length The length of TX buffer in bytes.
<> 149:156823d33999 221 * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
AnnaBridge 188:bcfe06ba3d64 222 * received data are ignored.
AnnaBridge 188:bcfe06ba3d64 223 * @param rx_length The length of RX buffer in bytes.
AnnaBridge 188:bcfe06ba3d64 224 * @param bit_width The buffers element width in bits.
AnnaBridge 188:bcfe06ba3d64 225 * @param callback The event callback function.
AnnaBridge 188:bcfe06ba3d64 226 * @param event The event mask of events to modify.
AnnaBridge 188:bcfe06ba3d64 227 *
AnnaBridge 188:bcfe06ba3d64 228 * @return Operation success.
AnnaBridge 188:bcfe06ba3d64 229 * @retval 0 A transfer was started or added to the queue.
AnnaBridge 188:bcfe06ba3d64 230 * @retval -1 Transfer can't be added because queue is full.
AnnaBridge 188:bcfe06ba3d64 231 */
AnnaBridge 187:0387e8f68319 232 int transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t &callback, int event);
<> 149:156823d33999 233
AnnaBridge 188:bcfe06ba3d64 234 /** Put a transfer on the transfer queue.
<> 149:156823d33999 235 *
AnnaBridge 188:bcfe06ba3d64 236 * @param tx_buffer The TX buffer with data to be transferred. If NULL is passed,
AnnaBridge 188:bcfe06ba3d64 237 * the default SPI value is sent.
AnnaBridge 188:bcfe06ba3d64 238 * @param tx_length The length of TX buffer in bytes.
<> 149:156823d33999 239 * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
AnnaBridge 188:bcfe06ba3d64 240 * received data are ignored.
AnnaBridge 188:bcfe06ba3d64 241 * @param rx_length The length of RX buffer in bytes.
AnnaBridge 188:bcfe06ba3d64 242 * @param bit_width The buffers element width in bits.
AnnaBridge 188:bcfe06ba3d64 243 * @param callback The event callback function.
AnnaBridge 188:bcfe06ba3d64 244 * @param event The event mask of events to modify.
AnnaBridge 188:bcfe06ba3d64 245 *
AnnaBridge 188:bcfe06ba3d64 246 * @return Operation success.
AnnaBridge 188:bcfe06ba3d64 247 * @retval 0 A transfer was added to the queue.
AnnaBridge 188:bcfe06ba3d64 248 * @retval -1 Transfer can't be added because queue is full.
AnnaBridge 188:bcfe06ba3d64 249 */
AnnaBridge 187:0387e8f68319 250 int queue_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t &callback, int event);
<> 149:156823d33999 251
AnnaBridge 188:bcfe06ba3d64 252 /** Configure a callback, SPI peripheral, and initiate a new transfer.
<> 149:156823d33999 253 *
AnnaBridge 188:bcfe06ba3d64 254 * @param tx_buffer The TX buffer with data to be transferred. If NULL is passed,
AnnaBridge 188:bcfe06ba3d64 255 * the default SPI value is sent.
AnnaBridge 188:bcfe06ba3d64 256 * @param tx_length The length of TX buffer in bytes.
<> 149:156823d33999 257 * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
AnnaBridge 188:bcfe06ba3d64 258 * received data are ignored.
AnnaBridge 188:bcfe06ba3d64 259 * @param rx_length The length of RX buffer in bytes.
AnnaBridge 188:bcfe06ba3d64 260 * @param bit_width The buffers element width.
AnnaBridge 188:bcfe06ba3d64 261 * @param callback The event callback function.
AnnaBridge 188:bcfe06ba3d64 262 * @param event The event mask of events to modify.
AnnaBridge 188:bcfe06ba3d64 263 */
AnnaBridge 187:0387e8f68319 264 void start_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t &callback, int event);
<> 149:156823d33999 265
AnnaBridge 188:bcfe06ba3d64 266 #if !defined(DOXYGEN_ONLY)
AnnaBridge 188:bcfe06ba3d64 267
Anna Bridge 180:96ed750bd169 268 private:
Anna Bridge 180:96ed750bd169 269 /** Lock deep sleep only if it is not yet locked */
Anna Bridge 180:96ed750bd169 270 void lock_deep_sleep();
Anna Bridge 180:96ed750bd169 271
Anna Bridge 180:96ed750bd169 272 /** Unlock deep sleep in case it is locked */
Anna Bridge 180:96ed750bd169 273 void unlock_deep_sleep();
Anna Bridge 180:96ed750bd169 274
Anna Bridge 180:96ed750bd169 275
<> 149:156823d33999 276 #if TRANSACTION_QUEUE_SIZE_SPI
<> 149:156823d33999 277
AnnaBridge 188:bcfe06ba3d64 278 /** Start a new transaction.
<> 149:156823d33999 279 *
AnnaBridge 188:bcfe06ba3d64 280 * @param data Transaction data.
AnnaBridge 188:bcfe06ba3d64 281 */
<> 149:156823d33999 282 void start_transaction(transaction_t *data);
<> 149:156823d33999 283
AnnaBridge 188:bcfe06ba3d64 284 /** Dequeue a transaction and start the transfer if there was one pending.
AnnaBridge 188:bcfe06ba3d64 285 */
<> 149:156823d33999 286 void dequeue_transaction();
AnnaBridge 188:bcfe06ba3d64 287
AnnaBridge 188:bcfe06ba3d64 288 /* Queue of pending transfers */
<> 149:156823d33999 289 static CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> _transaction_buffer;
<> 149:156823d33999 290 #endif
<> 149:156823d33999 291
AnnaBridge 188:bcfe06ba3d64 292 #endif //!defined(DOXYGEN_ONLY)
<> 149:156823d33999 293
AnnaBridge 188:bcfe06ba3d64 294 #endif //DEVICE_SPI_ASYNCH
AnnaBridge 188:bcfe06ba3d64 295
AnnaBridge 188:bcfe06ba3d64 296 #if !defined(DOXYGEN_ONLY)
<> 149:156823d33999 297
<> 149:156823d33999 298 protected:
AnnaBridge 188:bcfe06ba3d64 299 /* Internal SPI object identifying the resources */
<> 149:156823d33999 300 spi_t _spi;
<> 149:156823d33999 301
<> 149:156823d33999 302 #if DEVICE_SPI_ASYNCH
AnnaBridge 188:bcfe06ba3d64 303 /* Interrupt */
<> 149:156823d33999 304 CThunk<SPI> _irq;
AnnaBridge 188:bcfe06ba3d64 305 /* Interrupt handler callback */
<> 149:156823d33999 306 event_callback_t _callback;
AnnaBridge 188:bcfe06ba3d64 307 /* Current preferred DMA mode @see dma_api.h */
<> 149:156823d33999 308 DMAUsage _usage;
AnnaBridge 188:bcfe06ba3d64 309 /* Current sate of the sleep manager */
Anna Bridge 180:96ed750bd169 310 bool _deep_sleep_locked;
<> 149:156823d33999 311 #endif
<> 149:156823d33999 312
AnnaBridge 188:bcfe06ba3d64 313 /* Take over the physical SPI and apply our settings (thread safe) */
<> 149:156823d33999 314 void aquire(void);
AnnaBridge 188:bcfe06ba3d64 315 /* Current user of the SPI */
<> 149:156823d33999 316 static SPI *_owner;
AnnaBridge 188:bcfe06ba3d64 317 /* Used by lock and unlock for thread safety */
<> 149:156823d33999 318 static SingletonPtr<PlatformMutex> _mutex;
AnnaBridge 188:bcfe06ba3d64 319 /* Size of the SPI frame */
<> 149:156823d33999 320 int _bits;
AnnaBridge 188:bcfe06ba3d64 321 /* Clock polairy and phase */
<> 149:156823d33999 322 int _mode;
AnnaBridge 188:bcfe06ba3d64 323 /* Clock frequency */
<> 149:156823d33999 324 int _hz;
AnnaBridge 188:bcfe06ba3d64 325 /* Default character used for NULL transfers */
Kojto 170:19eb464bc2be 326 char _write_fill;
Kojto 169:e3b6fe271b81 327
Kojto 169:e3b6fe271b81 328 private:
AnnaBridge 188:bcfe06ba3d64 329 /** Private acquire function without locking/unlocking.
AnnaBridge 188:bcfe06ba3d64 330 * Implemented in order to avoid duplicate locking and boost performance.
Kojto 169:e3b6fe271b81 331 */
Kojto 169:e3b6fe271b81 332 void _acquire(void);
AnnaBridge 188:bcfe06ba3d64 333
AnnaBridge 188:bcfe06ba3d64 334 #endif //!defined(DOXYGEN_ONLY)
<> 149:156823d33999 335 };
<> 149:156823d33999 336
<> 149:156823d33999 337 } // namespace mbed
<> 149:156823d33999 338
<> 149:156823d33999 339 #endif
<> 149:156823d33999 340
<> 149:156823d33999 341 #endif