takashi kadono / Mbed OS Nucleo_446

Color Oled(SSD1331) connect to STMicroelectronics Nucleo-F466

Dependencies:   ssd1331

mbed-os/drivers/SPI.h@3:f3764f852aa8, 2018-10-11 (annotated)

Committer:
kadonotakashi
Date:
Thu Oct 11 02:27:46 2018 +0000
Revision:
3:f3764f852aa8
Parent:
0:8fdf9a60065b 
Nucreo 446 + SSD1331 test version;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kadonotakashi 0:8fdf9a60065b 1 /* mbed Microcontroller Library
kadonotakashi 0:8fdf9a60065b 2 * Copyright (c) 2006-2015 ARM Limited
kadonotakashi 0:8fdf9a60065b 3 *
kadonotakashi 0:8fdf9a60065b 4 * Licensed under the Apache License, Version 2.0 (the "License");
kadonotakashi 0:8fdf9a60065b 5 * you may not use this file except in compliance with the License.
kadonotakashi 0:8fdf9a60065b 6 * You may obtain a copy of the License at
kadonotakashi 0:8fdf9a60065b 7 *
kadonotakashi 0:8fdf9a60065b 8 * http://www.apache.org/licenses/LICENSE-2.0
kadonotakashi 0:8fdf9a60065b 9 *
kadonotakashi 0:8fdf9a60065b 10 * Unless required by applicable law or agreed to in writing, software
kadonotakashi 0:8fdf9a60065b 11 * distributed under the License is distributed on an "AS IS" BASIS,
kadonotakashi 0:8fdf9a60065b 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kadonotakashi 0:8fdf9a60065b 13 * See the License for the specific language governing permissions and
kadonotakashi 0:8fdf9a60065b 14 * limitations under the License.
kadonotakashi 0:8fdf9a60065b 15 */
kadonotakashi 0:8fdf9a60065b 16 #ifndef MBED_SPI_H
kadonotakashi 0:8fdf9a60065b 17 #define MBED_SPI_H
kadonotakashi 0:8fdf9a60065b 18
kadonotakashi 0:8fdf9a60065b 19 #include "platform/platform.h"
kadonotakashi 0:8fdf9a60065b 20
kadonotakashi 0:8fdf9a60065b 21 #if defined (DEVICE_SPI) || defined(DOXYGEN_ONLY)
kadonotakashi 0:8fdf9a60065b 22
kadonotakashi 0:8fdf9a60065b 23 #include "platform/PlatformMutex.h"
kadonotakashi 0:8fdf9a60065b 24 #include "hal/spi_api.h"
kadonotakashi 0:8fdf9a60065b 25 #include "platform/SingletonPtr.h"
kadonotakashi 0:8fdf9a60065b 26 #include "platform/NonCopyable.h"
kadonotakashi 0:8fdf9a60065b 27
kadonotakashi 0:8fdf9a60065b 28 #if DEVICE_SPI_ASYNCH
kadonotakashi 0:8fdf9a60065b 29 #include "platform/CThunk.h"
kadonotakashi 0:8fdf9a60065b 30 #include "hal/dma_api.h"
kadonotakashi 0:8fdf9a60065b 31 #include "platform/CircularBuffer.h"
kadonotakashi 0:8fdf9a60065b 32 #include "platform/FunctionPointer.h"
kadonotakashi 0:8fdf9a60065b 33 #include "platform/Transaction.h"
kadonotakashi 0:8fdf9a60065b 34 #endif
kadonotakashi 0:8fdf9a60065b 35
kadonotakashi 0:8fdf9a60065b 36 namespace mbed {
kadonotakashi 0:8fdf9a60065b 37 /** \addtogroup drivers */
kadonotakashi 0:8fdf9a60065b 38
kadonotakashi 0:8fdf9a60065b 39 /** A SPI Master, used for communicating with SPI slave devices
kadonotakashi 0:8fdf9a60065b 40 *
kadonotakashi 0:8fdf9a60065b 41 * The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz
kadonotakashi 0:8fdf9a60065b 42 *
kadonotakashi 0:8fdf9a60065b 43 * Most SPI devices will also require Chip Select and Reset signals. These
kadonotakashi 0:8fdf9a60065b 44 * can be controlled using DigitalOut pins
kadonotakashi 0:8fdf9a60065b 45 *
kadonotakashi 0:8fdf9a60065b 46 * @note Synchronization level: Thread safe
kadonotakashi 0:8fdf9a60065b 47 *
kadonotakashi 0:8fdf9a60065b 48 * Example:
kadonotakashi 0:8fdf9a60065b 49 * @code
kadonotakashi 0:8fdf9a60065b 50 * // Send a byte to a SPI slave, and record the response
kadonotakashi 0:8fdf9a60065b 51 *
kadonotakashi 0:8fdf9a60065b 52 * #include "mbed.h"
kadonotakashi 0:8fdf9a60065b 53 *
kadonotakashi 0:8fdf9a60065b 54 * // hardware ssel (where applicable)
kadonotakashi 0:8fdf9a60065b 55 * //SPI device(p5, p6, p7, p8); // mosi, miso, sclk, ssel
kadonotakashi 0:8fdf9a60065b 56 *
kadonotakashi 0:8fdf9a60065b 57 * // software ssel
kadonotakashi 0:8fdf9a60065b 58 * SPI device(p5, p6, p7); // mosi, miso, sclk
kadonotakashi 0:8fdf9a60065b 59 * DigitalOut cs(p8); // ssel
kadonotakashi 0:8fdf9a60065b 60 *
kadonotakashi 0:8fdf9a60065b 61 * int main() {
kadonotakashi 0:8fdf9a60065b 62 * // hardware ssel (where applicable)
kadonotakashi 0:8fdf9a60065b 63 * //int response = device.write(0xFF);
kadonotakashi 0:8fdf9a60065b 64 *
kadonotakashi 0:8fdf9a60065b 65 * device.lock();
kadonotakashi 0:8fdf9a60065b 66 * // software ssel
kadonotakashi 0:8fdf9a60065b 67 * cs = 0;
kadonotakashi 0:8fdf9a60065b 68 * int response = device.write(0xFF);
kadonotakashi 0:8fdf9a60065b 69 * cs = 1;
kadonotakashi 0:8fdf9a60065b 70 * device.unlock();
kadonotakashi 0:8fdf9a60065b 71 *
kadonotakashi 0:8fdf9a60065b 72 * }
kadonotakashi 0:8fdf9a60065b 73 * @endcode
kadonotakashi 0:8fdf9a60065b 74 * @ingroup drivers
kadonotakashi 0:8fdf9a60065b 75 */
kadonotakashi 0:8fdf9a60065b 76 class SPI : private NonCopyable<SPI> {
kadonotakashi 0:8fdf9a60065b 77
kadonotakashi 0:8fdf9a60065b 78 public:
kadonotakashi 0:8fdf9a60065b 79
kadonotakashi 0:8fdf9a60065b 80 /** Create a SPI master connected to the specified pins
kadonotakashi 0:8fdf9a60065b 81 *
kadonotakashi 0:8fdf9a60065b 82 * mosi or miso can be specified as NC if not used
kadonotakashi 0:8fdf9a60065b 83 *
kadonotakashi 0:8fdf9a60065b 84 * @param mosi SPI Master Out, Slave In pin
kadonotakashi 0:8fdf9a60065b 85 * @param miso SPI Master In, Slave Out pin
kadonotakashi 0:8fdf9a60065b 86 * @param sclk SPI Clock pin
kadonotakashi 0:8fdf9a60065b 87 * @param ssel SPI chip select pin
kadonotakashi 0:8fdf9a60065b 88 */
kadonotakashi 0:8fdf9a60065b 89 SPI(PinName mosi, PinName miso, PinName sclk, PinName ssel = NC);
kadonotakashi 0:8fdf9a60065b 90 virtual ~SPI();
kadonotakashi 0:8fdf9a60065b 91
kadonotakashi 0:8fdf9a60065b 92 /** Configure the data transmission format
kadonotakashi 0:8fdf9a60065b 93 *
kadonotakashi 0:8fdf9a60065b 94 * @param bits Number of bits per SPI frame (4 - 16)
kadonotakashi 0:8fdf9a60065b 95 * @param mode Clock polarity and phase mode (0 - 3)
kadonotakashi 0:8fdf9a60065b 96 *
kadonotakashi 0:8fdf9a60065b 97 * @code
kadonotakashi 0:8fdf9a60065b 98 * mode | POL PHA
kadonotakashi 0:8fdf9a60065b 99 * -----+--------
kadonotakashi 0:8fdf9a60065b 100 * 0 | 0 0
kadonotakashi 0:8fdf9a60065b 101 * 1 | 0 1
kadonotakashi 0:8fdf9a60065b 102 * 2 | 1 0
kadonotakashi 0:8fdf9a60065b 103 * 3 | 1 1
kadonotakashi 0:8fdf9a60065b 104 * @endcode
kadonotakashi 0:8fdf9a60065b 105 */
kadonotakashi 0:8fdf9a60065b 106 void format(int bits, int mode = 0);
kadonotakashi 0:8fdf9a60065b 107
kadonotakashi 0:8fdf9a60065b 108 /** Set the spi bus clock frequency
kadonotakashi 0:8fdf9a60065b 109 *
kadonotakashi 0:8fdf9a60065b 110 * @param hz SCLK frequency in hz (default = 1MHz)
kadonotakashi 0:8fdf9a60065b 111 */
kadonotakashi 0:8fdf9a60065b 112 void frequency(int hz = 1000000);
kadonotakashi 0:8fdf9a60065b 113
kadonotakashi 0:8fdf9a60065b 114 /** Write to the SPI Slave and return the response
kadonotakashi 0:8fdf9a60065b 115 *
kadonotakashi 0:8fdf9a60065b 116 * @param value Data to be sent to the SPI slave
kadonotakashi 0:8fdf9a60065b 117 *
kadonotakashi 0:8fdf9a60065b 118 * @returns
kadonotakashi 0:8fdf9a60065b 119 * Response from the SPI slave
kadonotakashi 0:8fdf9a60065b 120 */
kadonotakashi 0:8fdf9a60065b 121 virtual int write(int value);
kadonotakashi 0:8fdf9a60065b 122
kadonotakashi 0:8fdf9a60065b 123 /** Write to the SPI Slave and obtain the response
kadonotakashi 0:8fdf9a60065b 124 *
kadonotakashi 0:8fdf9a60065b 125 * The total number of bytes sent and received will be the maximum of
kadonotakashi 0:8fdf9a60065b 126 * tx_length and rx_length. The bytes written will be padded with the
kadonotakashi 0:8fdf9a60065b 127 * value 0xff.
kadonotakashi 0:8fdf9a60065b 128 *
kadonotakashi 0:8fdf9a60065b 129 * @param tx_buffer Pointer to the byte-array of data to write to the device
kadonotakashi 0:8fdf9a60065b 130 * @param tx_length Number of bytes to write, may be zero
kadonotakashi 0:8fdf9a60065b 131 * @param rx_buffer Pointer to the byte-array of data to read from the device
kadonotakashi 0:8fdf9a60065b 132 * @param rx_length Number of bytes to read, may be zero
kadonotakashi 0:8fdf9a60065b 133 * @returns
kadonotakashi 0:8fdf9a60065b 134 * The number of bytes written and read from the device. This is
kadonotakashi 0:8fdf9a60065b 135 * maximum of tx_length and rx_length.
kadonotakashi 0:8fdf9a60065b 136 */
kadonotakashi 0:8fdf9a60065b 137 virtual int write(const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length);
kadonotakashi 0:8fdf9a60065b 138
kadonotakashi 0:8fdf9a60065b 139 /** Acquire exclusive access to this SPI bus
kadonotakashi 0:8fdf9a60065b 140 */
kadonotakashi 0:8fdf9a60065b 141 virtual void lock(void);
kadonotakashi 0:8fdf9a60065b 142
kadonotakashi 0:8fdf9a60065b 143 /** Release exclusive access to this SPI bus
kadonotakashi 0:8fdf9a60065b 144 */
kadonotakashi 0:8fdf9a60065b 145 virtual void unlock(void);
kadonotakashi 0:8fdf9a60065b 146
kadonotakashi 0:8fdf9a60065b 147 /** Set default write data
kadonotakashi 0:8fdf9a60065b 148 * SPI requires the master to send some data during a read operation.
kadonotakashi 0:8fdf9a60065b 149 * Different devices may require different default byte values.
kadonotakashi 0:8fdf9a60065b 150 * For example: A SD Card requires default bytes to be 0xFF.
kadonotakashi 0:8fdf9a60065b 151 *
kadonotakashi 0:8fdf9a60065b 152 * @param data Default character to be transmitted while read operation
kadonotakashi 0:8fdf9a60065b 153 */
kadonotakashi 0:8fdf9a60065b 154 void set_default_write_value(char data);
kadonotakashi 0:8fdf9a60065b 155
kadonotakashi 0:8fdf9a60065b 156 #if DEVICE_SPI_ASYNCH
kadonotakashi 0:8fdf9a60065b 157
kadonotakashi 0:8fdf9a60065b 158 /** Start non-blocking SPI transfer using 8bit buffers.
kadonotakashi 0:8fdf9a60065b 159 *
kadonotakashi 0:8fdf9a60065b 160 * This function locks the deep sleep until any event has occurred
kadonotakashi 0:8fdf9a60065b 161 *
kadonotakashi 0:8fdf9a60065b 162 * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
kadonotakashi 0:8fdf9a60065b 163 * the default SPI value is sent
kadonotakashi 0:8fdf9a60065b 164 * @param tx_length The length of TX buffer in bytes
kadonotakashi 0:8fdf9a60065b 165 * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
kadonotakashi 0:8fdf9a60065b 166 * received data are ignored
kadonotakashi 0:8fdf9a60065b 167 * @param rx_length The length of RX buffer in bytes
kadonotakashi 0:8fdf9a60065b 168 * @param callback The event callback function
kadonotakashi 0:8fdf9a60065b 169 * @param event The logical OR of events to modify. Look at spi hal header file for SPI events.
kadonotakashi 0:8fdf9a60065b 170 * @return Zero if the transfer has started, or -1 if SPI peripheral is busy
kadonotakashi 0:8fdf9a60065b 171 */
kadonotakashi 0:8fdf9a60065b 172 template<typename Type>
kadonotakashi 0:8fdf9a60065b 173 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)
kadonotakashi 0:8fdf9a60065b 174 {
kadonotakashi 0:8fdf9a60065b 175 if (spi_active(&_spi)) {
kadonotakashi 0:8fdf9a60065b 176 return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, sizeof(Type) * 8, callback, event);
kadonotakashi 0:8fdf9a60065b 177 }
kadonotakashi 0:8fdf9a60065b 178 start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, sizeof(Type) * 8, callback, event);
kadonotakashi 0:8fdf9a60065b 179 return 0;
kadonotakashi 0:8fdf9a60065b 180 }
kadonotakashi 0:8fdf9a60065b 181
kadonotakashi 0:8fdf9a60065b 182 /** Abort the on-going SPI transfer, and continue with transfer's in the queue if any.
kadonotakashi 0:8fdf9a60065b 183 */
kadonotakashi 0:8fdf9a60065b 184 void abort_transfer();
kadonotakashi 0:8fdf9a60065b 185
kadonotakashi 0:8fdf9a60065b 186 /** Clear the transaction buffer
kadonotakashi 0:8fdf9a60065b 187 */
kadonotakashi 0:8fdf9a60065b 188 void clear_transfer_buffer();
kadonotakashi 0:8fdf9a60065b 189
kadonotakashi 0:8fdf9a60065b 190 /** Clear the transaction buffer and abort on-going transfer.
kadonotakashi 0:8fdf9a60065b 191 */
kadonotakashi 0:8fdf9a60065b 192 void abort_all_transfers();
kadonotakashi 0:8fdf9a60065b 193
kadonotakashi 0:8fdf9a60065b 194 /** Configure DMA usage suggestion for non-blocking transfers
kadonotakashi 0:8fdf9a60065b 195 *
kadonotakashi 0:8fdf9a60065b 196 * @param usage The usage DMA hint for peripheral
kadonotakashi 0:8fdf9a60065b 197 * @return Zero if the usage was set, -1 if a transaction is on-going
kadonotakashi 0:8fdf9a60065b 198 */
kadonotakashi 0:8fdf9a60065b 199 int set_dma_usage(DMAUsage usage);
kadonotakashi 0:8fdf9a60065b 200
kadonotakashi 0:8fdf9a60065b 201 protected:
kadonotakashi 0:8fdf9a60065b 202 /** SPI IRQ handler
kadonotakashi 0:8fdf9a60065b 203 *
kadonotakashi 0:8fdf9a60065b 204 */
kadonotakashi 0:8fdf9a60065b 205 void irq_handler_asynch(void);
kadonotakashi 0:8fdf9a60065b 206
kadonotakashi 0:8fdf9a60065b 207 /** Common transfer method
kadonotakashi 0:8fdf9a60065b 208 *
kadonotakashi 0:8fdf9a60065b 209 * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
kadonotakashi 0:8fdf9a60065b 210 * the default SPI value is sent
kadonotakashi 0:8fdf9a60065b 211 * @param tx_length The length of TX buffer in bytes
kadonotakashi 0:8fdf9a60065b 212 * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
kadonotakashi 0:8fdf9a60065b 213 * received data are ignored
kadonotakashi 0:8fdf9a60065b 214 * @param rx_length The length of RX buffer in bytes
kadonotakashi 0:8fdf9a60065b 215 * @param bit_width The buffers element width
kadonotakashi 0:8fdf9a60065b 216 * @param callback The event callback function
kadonotakashi 0:8fdf9a60065b 217 * @param event The logical OR of events to modify
kadonotakashi 0:8fdf9a60065b 218 * @return Zero if the transfer has started or was added to the queue, or -1 if SPI peripheral is busy/buffer is full
kadonotakashi 0:8fdf9a60065b 219 */
kadonotakashi 0:8fdf9a60065b 220 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);
kadonotakashi 0:8fdf9a60065b 221
kadonotakashi 0:8fdf9a60065b 222 /**
kadonotakashi 0:8fdf9a60065b 223 *
kadonotakashi 0:8fdf9a60065b 224 * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
kadonotakashi 0:8fdf9a60065b 225 * the default SPI value is sent
kadonotakashi 0:8fdf9a60065b 226 * @param tx_length The length of TX buffer in bytes
kadonotakashi 0:8fdf9a60065b 227 * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
kadonotakashi 0:8fdf9a60065b 228 * received data are ignored
kadonotakashi 0:8fdf9a60065b 229 * @param rx_length The length of RX buffer in bytes
kadonotakashi 0:8fdf9a60065b 230 * @param bit_width The buffers element width
kadonotakashi 0:8fdf9a60065b 231 * @param callback The event callback function
kadonotakashi 0:8fdf9a60065b 232 * @param event The logical OR of events to modify
kadonotakashi 0:8fdf9a60065b 233 * @return Zero if a transfer was added to the queue, or -1 if the queue is full
kadonotakashi 0:8fdf9a60065b 234 */
kadonotakashi 0:8fdf9a60065b 235 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);
kadonotakashi 0:8fdf9a60065b 236
kadonotakashi 0:8fdf9a60065b 237 /** Configures a callback, spi peripheral and initiate a new transfer
kadonotakashi 0:8fdf9a60065b 238 *
kadonotakashi 0:8fdf9a60065b 239 * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
kadonotakashi 0:8fdf9a60065b 240 * the default SPI value is sent
kadonotakashi 0:8fdf9a60065b 241 * @param tx_length The length of TX buffer in bytes
kadonotakashi 0:8fdf9a60065b 242 * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
kadonotakashi 0:8fdf9a60065b 243 * received data are ignored
kadonotakashi 0:8fdf9a60065b 244 * @param rx_length The length of RX buffer in bytes
kadonotakashi 0:8fdf9a60065b 245 * @param bit_width The buffers element width
kadonotakashi 0:8fdf9a60065b 246 * @param callback The event callback function
kadonotakashi 0:8fdf9a60065b 247 * @param event The logical OR of events to modify
kadonotakashi 0:8fdf9a60065b 248 */
kadonotakashi 0:8fdf9a60065b 249 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);
kadonotakashi 0:8fdf9a60065b 250
kadonotakashi 0:8fdf9a60065b 251 private:
kadonotakashi 0:8fdf9a60065b 252 /** Lock deep sleep only if it is not yet locked */
kadonotakashi 0:8fdf9a60065b 253 void lock_deep_sleep();
kadonotakashi 0:8fdf9a60065b 254
kadonotakashi 0:8fdf9a60065b 255 /** Unlock deep sleep in case it is locked */
kadonotakashi 0:8fdf9a60065b 256 void unlock_deep_sleep();
kadonotakashi 0:8fdf9a60065b 257
kadonotakashi 0:8fdf9a60065b 258
kadonotakashi 0:8fdf9a60065b 259 #if TRANSACTION_QUEUE_SIZE_SPI
kadonotakashi 0:8fdf9a60065b 260
kadonotakashi 0:8fdf9a60065b 261 /** Start a new transaction
kadonotakashi 0:8fdf9a60065b 262 *
kadonotakashi 0:8fdf9a60065b 263 * @param data Transaction data
kadonotakashi 0:8fdf9a60065b 264 */
kadonotakashi 0:8fdf9a60065b 265 void start_transaction(transaction_t *data);
kadonotakashi 0:8fdf9a60065b 266
kadonotakashi 0:8fdf9a60065b 267 /** Dequeue a transaction
kadonotakashi 0:8fdf9a60065b 268 *
kadonotakashi 0:8fdf9a60065b 269 */
kadonotakashi 0:8fdf9a60065b 270 void dequeue_transaction();
kadonotakashi 0:8fdf9a60065b 271 static CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> _transaction_buffer;
kadonotakashi 0:8fdf9a60065b 272 #endif
kadonotakashi 0:8fdf9a60065b 273
kadonotakashi 0:8fdf9a60065b 274 #endif
kadonotakashi 0:8fdf9a60065b 275
kadonotakashi 0:8fdf9a60065b 276 protected:
kadonotakashi 0:8fdf9a60065b 277 spi_t _spi;
kadonotakashi 0:8fdf9a60065b 278
kadonotakashi 0:8fdf9a60065b 279 #if DEVICE_SPI_ASYNCH
kadonotakashi 0:8fdf9a60065b 280 CThunk<SPI> _irq;
kadonotakashi 0:8fdf9a60065b 281 event_callback_t _callback;
kadonotakashi 0:8fdf9a60065b 282 DMAUsage _usage;
kadonotakashi 0:8fdf9a60065b 283 bool _deep_sleep_locked;
kadonotakashi 0:8fdf9a60065b 284 #endif
kadonotakashi 0:8fdf9a60065b 285
kadonotakashi 0:8fdf9a60065b 286 void aquire(void);
kadonotakashi 0:8fdf9a60065b 287 static SPI *_owner;
kadonotakashi 0:8fdf9a60065b 288 static SingletonPtr<PlatformMutex> _mutex;
kadonotakashi 0:8fdf9a60065b 289 int _bits;
kadonotakashi 0:8fdf9a60065b 290 int _mode;
kadonotakashi 0:8fdf9a60065b 291 int _hz;
kadonotakashi 0:8fdf9a60065b 292 char _write_fill;
kadonotakashi 0:8fdf9a60065b 293
kadonotakashi 0:8fdf9a60065b 294 private:
kadonotakashi 0:8fdf9a60065b 295 /* Private acquire function without locking/unlocking
kadonotakashi 0:8fdf9a60065b 296 * Implemented in order to avoid duplicate locking and boost performance
kadonotakashi 0:8fdf9a60065b 297 */
kadonotakashi 0:8fdf9a60065b 298 void _acquire(void);
kadonotakashi 0:8fdf9a60065b 299 };
kadonotakashi 0:8fdf9a60065b 300
kadonotakashi 0:8fdf9a60065b 301 } // namespace mbed
kadonotakashi 0:8fdf9a60065b 302
kadonotakashi 0:8fdf9a60065b 303 #endif
kadonotakashi 0:8fdf9a60065b 304
kadonotakashi 0:8fdf9a60065b 305 #endif