Martin Woolley / microbit-dal-ble-accelerometer-example

Forked to avoid changing the publioc repo

Dependencies:   BLE_API mbed-dev-bin nRF51822

Fork of microbit-dal by Lancaster University

source/drivers/MicroBitSerial.cpp@59:d73a257e9f89, 2016-07-13 (annotated)

Committer:
LancasterUniversity
Date:
Wed Jul 13 12:18:39 2016 +0100
Revision:
59:d73a257e9f89
Parent:
46:c5bb7af0a3f0
Child:
60:122814b3e76e
Synchronized with git rev 158eb43b

Author: James Devine

microbit-dal: MicroBitSerial.[eventOn, eventAfter] clarity



The documentation for MicroBitSerial.[eventOn, eventAfter] is now

clearer on what events are generated.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Jonathan Austin 1:8aa5cdb4ab67 1 /*
Jonathan Austin 1:8aa5cdb4ab67 2 The MIT License (MIT)
Jonathan Austin 1:8aa5cdb4ab67 3
Jonathan Austin 1:8aa5cdb4ab67 4 Copyright (c) 2016 British Broadcasting Corporation.
Jonathan Austin 1:8aa5cdb4ab67 5 This software is provided by Lancaster University by arrangement with the BBC.
Jonathan Austin 1:8aa5cdb4ab67 6
Jonathan Austin 1:8aa5cdb4ab67 7 Permission is hereby granted, free of charge, to any person obtaining a
Jonathan Austin 1:8aa5cdb4ab67 8 copy of this software and associated documentation files (the "Software"),
Jonathan Austin 1:8aa5cdb4ab67 9 to deal in the Software without restriction, including without limitation
Jonathan Austin 1:8aa5cdb4ab67 10 the rights to use, copy, modify, merge, publish, distribute, sublicense,
Jonathan Austin 1:8aa5cdb4ab67 11 and/or sell copies of the Software, and to permit persons to whom the
Jonathan Austin 1:8aa5cdb4ab67 12 Software is furnished to do so, subject to the following conditions:
Jonathan Austin 1:8aa5cdb4ab67 13
Jonathan Austin 1:8aa5cdb4ab67 14 The above copyright notice and this permission notice shall be included in
Jonathan Austin 1:8aa5cdb4ab67 15 all copies or substantial portions of the Software.
Jonathan Austin 1:8aa5cdb4ab67 16
Jonathan Austin 1:8aa5cdb4ab67 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Jonathan Austin 1:8aa5cdb4ab67 18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Jonathan Austin 1:8aa5cdb4ab67 19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
Jonathan Austin 1:8aa5cdb4ab67 20 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 21 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
Jonathan Austin 1:8aa5cdb4ab67 22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 23 DEALINGS IN THE SOFTWARE.
Jonathan Austin 1:8aa5cdb4ab67 24 */
Jonathan Austin 1:8aa5cdb4ab67 25
Jonathan Austin 1:8aa5cdb4ab67 26 #include "mbed.h"
Jonathan Austin 1:8aa5cdb4ab67 27 #include "MicroBitSerial.h"
Jonathan Austin 1:8aa5cdb4ab67 28 #include "ErrorNo.h"
Jonathan Austin 1:8aa5cdb4ab67 29 #include "MicroBitComponent.h"
Jonathan Austin 1:8aa5cdb4ab67 30 #include "MicroBitFiber.h"
Jonathan Austin 1:8aa5cdb4ab67 31 #include "NotifyEvents.h"
Jonathan Austin 1:8aa5cdb4ab67 32
Jonathan Austin 1:8aa5cdb4ab67 33 uint8_t MicroBitSerial::status = 0;
Jonathan Austin 1:8aa5cdb4ab67 34
Jonathan Austin 1:8aa5cdb4ab67 35 int MicroBitSerial::baudrate = 0;
Jonathan Austin 1:8aa5cdb4ab67 36
Jonathan Austin 1:8aa5cdb4ab67 37 /**
Jonathan Austin 1:8aa5cdb4ab67 38 * Constructor.
Jonathan Austin 1:8aa5cdb4ab67 39 * Create an instance of MicroBitSerial
Jonathan Austin 1:8aa5cdb4ab67 40 *
Jonathan Austin 1:8aa5cdb4ab67 41 * @param tx the Pin to be used for transmission
Jonathan Austin 1:8aa5cdb4ab67 42 *
Jonathan Austin 1:8aa5cdb4ab67 43 * @param rx the Pin to be used for receiving data
Jonathan Austin 1:8aa5cdb4ab67 44 *
Jonathan Austin 1:8aa5cdb4ab67 45 * @param rxBufferSize the size of the buffer to be used for receiving bytes
Jonathan Austin 1:8aa5cdb4ab67 46 *
Jonathan Austin 1:8aa5cdb4ab67 47 * @param txBufferSize the size of the buffer to be used for transmitting bytes
Jonathan Austin 1:8aa5cdb4ab67 48 *
Jonathan Austin 1:8aa5cdb4ab67 49 * @code
Jonathan Austin 1:8aa5cdb4ab67 50 * MicroBitSerial serial(USBTX, USBRX);
Jonathan Austin 1:8aa5cdb4ab67 51 * @endcode
Jonathan Austin 1:8aa5cdb4ab67 52 * @note the default baud rate is 115200. More API details can be found:
Jonathan Austin 1:8aa5cdb4ab67 53 * -https://github.com/mbedmicro/mbed/blob/master/libraries/mbed/api/SerialBase.h
Jonathan Austin 1:8aa5cdb4ab67 54 * -https://github.com/mbedmicro/mbed/blob/master/libraries/mbed/api/RawSerial.h
Jonathan Austin 1:8aa5cdb4ab67 55 *
Jonathan Austin 1:8aa5cdb4ab67 56 * Buffers aren't allocated until the first send or receive respectively.
Jonathan Austin 1:8aa5cdb4ab67 57 */
Jonathan Austin 1:8aa5cdb4ab67 58 MicroBitSerial::MicroBitSerial(PinName tx, PinName rx, uint8_t rxBufferSize, uint8_t txBufferSize) : RawSerial(tx,rx), delimeters()
Jonathan Austin 1:8aa5cdb4ab67 59 {
Jonathan Austin 1:8aa5cdb4ab67 60 this->rxBuffSize = rxBufferSize;
Jonathan Austin 1:8aa5cdb4ab67 61 this->txBuffSize = txBufferSize;
Jonathan Austin 1:8aa5cdb4ab67 62
Jonathan Austin 1:8aa5cdb4ab67 63 this->rxBuff = NULL;
Jonathan Austin 1:8aa5cdb4ab67 64 this->txBuff = NULL;
Jonathan Austin 1:8aa5cdb4ab67 65
Jonathan Austin 1:8aa5cdb4ab67 66 this->rxBuffHead = 0;
Jonathan Austin 1:8aa5cdb4ab67 67 this->rxBuffTail = 0;
Jonathan Austin 1:8aa5cdb4ab67 68
Jonathan Austin 1:8aa5cdb4ab67 69 this->txBuffHead = 0;
Jonathan Austin 1:8aa5cdb4ab67 70 this->txBuffTail = 0;
Jonathan Austin 1:8aa5cdb4ab67 71
Jonathan Austin 1:8aa5cdb4ab67 72 this->rxBuffHeadMatch = -1;
Jonathan Austin 1:8aa5cdb4ab67 73
Jonathan Austin 1:8aa5cdb4ab67 74 this->baud(MICROBIT_SERIAL_DEFAULT_BAUD_RATE);
Jonathan Austin 1:8aa5cdb4ab67 75
Jonathan Austin 1:8aa5cdb4ab67 76 #if CONFIG_ENABLED(MICROBIT_DBG)
Jonathan Austin 1:8aa5cdb4ab67 77 SERIAL_DEBUG = this;
Jonathan Austin 1:8aa5cdb4ab67 78 #endif
Jonathan Austin 1:8aa5cdb4ab67 79
Jonathan Austin 1:8aa5cdb4ab67 80 }
Jonathan Austin 1:8aa5cdb4ab67 81
Jonathan Austin 1:8aa5cdb4ab67 82 /**
Jonathan Austin 1:8aa5cdb4ab67 83 * An internal interrupt callback for MicroBitSerial configured for when a
Jonathan Austin 1:8aa5cdb4ab67 84 * character is received.
Jonathan Austin 1:8aa5cdb4ab67 85 *
Jonathan Austin 1:8aa5cdb4ab67 86 * Each time a character is received fill our circular buffer!
Jonathan Austin 1:8aa5cdb4ab67 87 */
Jonathan Austin 1:8aa5cdb4ab67 88 void MicroBitSerial::dataReceived()
Jonathan Austin 1:8aa5cdb4ab67 89 {
Jonathan Austin 1:8aa5cdb4ab67 90 if(!(status & MICROBIT_SERIAL_RX_BUFF_INIT))
Jonathan Austin 1:8aa5cdb4ab67 91 return;
Jonathan Austin 1:8aa5cdb4ab67 92
Jonathan Austin 1:8aa5cdb4ab67 93 //get the received character
Jonathan Austin 1:8aa5cdb4ab67 94 char c = getc();
Jonathan Austin 1:8aa5cdb4ab67 95
Jonathan Austin 1:8aa5cdb4ab67 96 int delimeterOffset = 0;
Jonathan Austin 1:8aa5cdb4ab67 97 int delimLength = this->delimeters.length();
Jonathan Austin 1:8aa5cdb4ab67 98
Jonathan Austin 1:8aa5cdb4ab67 99 //iterate through our delimeters (if any) to see if there is a match
Jonathan Austin 1:8aa5cdb4ab67 100 while(delimeterOffset < delimLength)
Jonathan Austin 1:8aa5cdb4ab67 101 {
Jonathan Austin 1:8aa5cdb4ab67 102 //fire an event if there is to block any waiting fibers
Jonathan Austin 1:8aa5cdb4ab67 103 if(this->delimeters.charAt(delimeterOffset) == c)
Jonathan Austin 1:8aa5cdb4ab67 104 MicroBitEvent(MICROBIT_ID_SERIAL, MICROBIT_SERIAL_EVT_DELIM_MATCH);
Jonathan Austin 1:8aa5cdb4ab67 105
Jonathan Austin 1:8aa5cdb4ab67 106 delimeterOffset++;
Jonathan Austin 1:8aa5cdb4ab67 107 }
Jonathan Austin 1:8aa5cdb4ab67 108
Jonathan Austin 1:8aa5cdb4ab67 109 uint16_t newHead = (rxBuffHead + 1) % rxBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 110
Jonathan Austin 1:8aa5cdb4ab67 111 //look ahead to our newHead value to see if we are about to collide with the tail
Jonathan Austin 1:8aa5cdb4ab67 112 if(newHead != rxBuffTail)
Jonathan Austin 1:8aa5cdb4ab67 113 {
Jonathan Austin 1:8aa5cdb4ab67 114 //if we are not, store the character, and update our actual head.
Jonathan Austin 1:8aa5cdb4ab67 115 this->rxBuff[rxBuffHead] = c;
Jonathan Austin 1:8aa5cdb4ab67 116 rxBuffHead = newHead;
Jonathan Austin 1:8aa5cdb4ab67 117
Jonathan Austin 1:8aa5cdb4ab67 118 //if we have any fibers waiting for a specific number of characters, unblock them
Jonathan Austin 1:8aa5cdb4ab67 119 if(rxBuffHeadMatch >= 0)
Jonathan Austin 1:8aa5cdb4ab67 120 if(rxBuffHead == rxBuffHeadMatch)
Jonathan Austin 1:8aa5cdb4ab67 121 {
Jonathan Austin 1:8aa5cdb4ab67 122 rxBuffHeadMatch = -1;
Jonathan Austin 1:8aa5cdb4ab67 123 MicroBitEvent(MICROBIT_ID_SERIAL, MICROBIT_SERIAL_EVT_HEAD_MATCH);
Jonathan Austin 1:8aa5cdb4ab67 124 }
Jonathan Austin 1:8aa5cdb4ab67 125 }
Jonathan Austin 1:8aa5cdb4ab67 126 else
Jonathan Austin 1:8aa5cdb4ab67 127 //otherwise, our buffer is full, send an event to the user...
Jonathan Austin 1:8aa5cdb4ab67 128 MicroBitEvent(MICROBIT_ID_SERIAL, MICROBIT_SERIAL_EVT_RX_FULL);
Jonathan Austin 1:8aa5cdb4ab67 129 }
Jonathan Austin 1:8aa5cdb4ab67 130
Jonathan Austin 1:8aa5cdb4ab67 131 /**
Jonathan Austin 1:8aa5cdb4ab67 132 * An internal interrupt callback for MicroBitSerial.
Jonathan Austin 1:8aa5cdb4ab67 133 *
Jonathan Austin 1:8aa5cdb4ab67 134 * Each time the Serial module's buffer is empty, write a character if we have
Jonathan Austin 1:8aa5cdb4ab67 135 * characters to write.
Jonathan Austin 1:8aa5cdb4ab67 136 */
Jonathan Austin 1:8aa5cdb4ab67 137 void MicroBitSerial::dataWritten()
Jonathan Austin 1:8aa5cdb4ab67 138 {
Jonathan Austin 1:8aa5cdb4ab67 139 if(txBuffTail == txBuffHead || !(status & MICROBIT_SERIAL_TX_BUFF_INIT))
Jonathan Austin 1:8aa5cdb4ab67 140 return;
Jonathan Austin 1:8aa5cdb4ab67 141
Jonathan Austin 1:8aa5cdb4ab67 142 //send our current char
Jonathan Austin 1:8aa5cdb4ab67 143 putc(txBuff[txBuffTail]);
Jonathan Austin 1:8aa5cdb4ab67 144
Jonathan Austin 1:8aa5cdb4ab67 145 uint16_t nextTail = (txBuffTail + 1) % txBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 146
Jonathan Austin 1:8aa5cdb4ab67 147 //unblock any waiting fibers that are waiting for transmission to finish.
Jonathan Austin 1:8aa5cdb4ab67 148 if(nextTail == txBuffHead)
Jonathan Austin 1:8aa5cdb4ab67 149 {
Jonathan Austin 1:8aa5cdb4ab67 150 MicroBitEvent(MICROBIT_ID_NOTIFY, MICROBIT_SERIAL_EVT_TX_EMPTY);
LancasterUniversity 6:2e1c2e0d8c7a 151 detach(Serial::TxIrq);
Jonathan Austin 1:8aa5cdb4ab67 152 }
Jonathan Austin 1:8aa5cdb4ab67 153
Jonathan Austin 1:8aa5cdb4ab67 154 //update our tail!
Jonathan Austin 1:8aa5cdb4ab67 155 txBuffTail = nextTail;
Jonathan Austin 1:8aa5cdb4ab67 156 }
Jonathan Austin 1:8aa5cdb4ab67 157
Jonathan Austin 1:8aa5cdb4ab67 158 /**
Jonathan Austin 1:8aa5cdb4ab67 159 * An internal method to configure an interrupt on tx buffer and also
Jonathan Austin 1:8aa5cdb4ab67 160 * a best effort copy operation to move bytes from a user buffer to our txBuff
Jonathan Austin 1:8aa5cdb4ab67 161 *
Jonathan Austin 1:8aa5cdb4ab67 162 * @param string a pointer to the first character of the users' buffer.
Jonathan Austin 1:8aa5cdb4ab67 163 *
Jonathan Austin 1:8aa5cdb4ab67 164 * @param len the length of the string, and ultimately the maximum number of bytes
Jonathan Austin 1:8aa5cdb4ab67 165 * that will be copied dependent on the state of txBuff
Jonathan Austin 1:8aa5cdb4ab67 166 *
LancasterUniversity 25:27299423d813 167 * @param mode determines whether to configure the current fiber context or not. If
LancasterUniversity 25:27299423d813 168 * The mode is SYNC_SPINWAIT, the context will not be configured, otherwise
LancasterUniversity 25:27299423d813 169 * no context will be configured.
LancasterUniversity 25:27299423d813 170 *
Jonathan Austin 1:8aa5cdb4ab67 171 * @return the number of bytes copied into the buffer.
Jonathan Austin 1:8aa5cdb4ab67 172 */
LancasterUniversity 25:27299423d813 173 int MicroBitSerial::setTxInterrupt(uint8_t *string, int len, MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 174 {
Jonathan Austin 1:8aa5cdb4ab67 175 int copiedBytes = 0;
Jonathan Austin 1:8aa5cdb4ab67 176
Jonathan Austin 1:8aa5cdb4ab67 177 for(copiedBytes = 0; copiedBytes < len; copiedBytes++)
Jonathan Austin 1:8aa5cdb4ab67 178 {
Jonathan Austin 1:8aa5cdb4ab67 179 uint16_t nextHead = (txBuffHead + 1) % txBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 180 if(nextHead != txBuffTail)
Jonathan Austin 1:8aa5cdb4ab67 181 {
Jonathan Austin 1:8aa5cdb4ab67 182 this->txBuff[txBuffHead] = string[copiedBytes];
Jonathan Austin 1:8aa5cdb4ab67 183 txBuffHead = nextHead;
Jonathan Austin 1:8aa5cdb4ab67 184 }
Jonathan Austin 1:8aa5cdb4ab67 185 else
Jonathan Austin 1:8aa5cdb4ab67 186 break;
Jonathan Austin 1:8aa5cdb4ab67 187 }
Jonathan Austin 1:8aa5cdb4ab67 188
LancasterUniversity 25:27299423d813 189 if(mode != SYNC_SPINWAIT)
LancasterUniversity 25:27299423d813 190 fiber_wake_on_event(MICROBIT_ID_NOTIFY, MICROBIT_SERIAL_EVT_TX_EMPTY);
Jonathan Austin 1:8aa5cdb4ab67 191
Jonathan Austin 1:8aa5cdb4ab67 192 //set the TX interrupt
LancasterUniversity 6:2e1c2e0d8c7a 193 attach(this, &MicroBitSerial::dataWritten, Serial::TxIrq);
Jonathan Austin 1:8aa5cdb4ab67 194
Jonathan Austin 1:8aa5cdb4ab67 195 return copiedBytes;
Jonathan Austin 1:8aa5cdb4ab67 196 }
Jonathan Austin 1:8aa5cdb4ab67 197
Jonathan Austin 1:8aa5cdb4ab67 198 /**
Jonathan Austin 1:8aa5cdb4ab67 199 * Locks the mutex so that others can't use this serial instance for reception
Jonathan Austin 1:8aa5cdb4ab67 200 */
Jonathan Austin 1:8aa5cdb4ab67 201 void MicroBitSerial::lockRx()
Jonathan Austin 1:8aa5cdb4ab67 202 {
Jonathan Austin 1:8aa5cdb4ab67 203 status |= MICROBIT_SERIAL_RX_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 204 }
Jonathan Austin 1:8aa5cdb4ab67 205
Jonathan Austin 1:8aa5cdb4ab67 206 /**
Jonathan Austin 1:8aa5cdb4ab67 207 * Locks the mutex so that others can't use this serial instance for transmission
Jonathan Austin 1:8aa5cdb4ab67 208 */
Jonathan Austin 1:8aa5cdb4ab67 209 void MicroBitSerial::lockTx()
Jonathan Austin 1:8aa5cdb4ab67 210 {
Jonathan Austin 1:8aa5cdb4ab67 211 status |= MICROBIT_SERIAL_TX_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 212 }
Jonathan Austin 1:8aa5cdb4ab67 213
Jonathan Austin 1:8aa5cdb4ab67 214 /**
Jonathan Austin 1:8aa5cdb4ab67 215 * Unlocks the mutex so that others can use this serial instance for reception
Jonathan Austin 1:8aa5cdb4ab67 216 */
Jonathan Austin 1:8aa5cdb4ab67 217 void MicroBitSerial::unlockRx()
Jonathan Austin 1:8aa5cdb4ab67 218 {
Jonathan Austin 1:8aa5cdb4ab67 219 status &= ~MICROBIT_SERIAL_RX_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 220 }
Jonathan Austin 1:8aa5cdb4ab67 221
Jonathan Austin 1:8aa5cdb4ab67 222 /**
Jonathan Austin 1:8aa5cdb4ab67 223 * Unlocks the mutex so that others can use this serial instance for transmission
Jonathan Austin 1:8aa5cdb4ab67 224 */
Jonathan Austin 1:8aa5cdb4ab67 225 void MicroBitSerial::unlockTx()
Jonathan Austin 1:8aa5cdb4ab67 226 {
Jonathan Austin 1:8aa5cdb4ab67 227 status &= ~MICROBIT_SERIAL_TX_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 228 }
Jonathan Austin 1:8aa5cdb4ab67 229
Jonathan Austin 1:8aa5cdb4ab67 230 /**
Jonathan Austin 1:8aa5cdb4ab67 231 * We do not want to always have our buffers initialised, especially if users to not
Jonathan Austin 1:8aa5cdb4ab67 232 * use them. We only bring them up on demand.
Jonathan Austin 1:8aa5cdb4ab67 233 */
Jonathan Austin 1:8aa5cdb4ab67 234 int MicroBitSerial::initialiseRx()
Jonathan Austin 1:8aa5cdb4ab67 235 {
Jonathan Austin 1:8aa5cdb4ab67 236 if((status & MICROBIT_SERIAL_RX_BUFF_INIT))
Jonathan Austin 1:8aa5cdb4ab67 237 {
Jonathan Austin 1:8aa5cdb4ab67 238 //ensure that we receive no interrupts after freeing our buffer
LancasterUniversity 6:2e1c2e0d8c7a 239 detach(Serial::RxIrq);
Jonathan Austin 1:8aa5cdb4ab67 240 free(this->rxBuff);
Jonathan Austin 1:8aa5cdb4ab67 241 }
Jonathan Austin 1:8aa5cdb4ab67 242
Jonathan Austin 1:8aa5cdb4ab67 243 status &= ~MICROBIT_SERIAL_RX_BUFF_INIT;
Jonathan Austin 1:8aa5cdb4ab67 244
Jonathan Austin 1:8aa5cdb4ab67 245 if((this->rxBuff = (uint8_t *)malloc(rxBuffSize)) == NULL)
Jonathan Austin 1:8aa5cdb4ab67 246 return MICROBIT_NO_RESOURCES;
Jonathan Austin 1:8aa5cdb4ab67 247
Jonathan Austin 1:8aa5cdb4ab67 248 this->rxBuffHead = 0;
Jonathan Austin 1:8aa5cdb4ab67 249 this->rxBuffTail = 0;
Jonathan Austin 1:8aa5cdb4ab67 250
Jonathan Austin 1:8aa5cdb4ab67 251 //set the receive interrupt
Jonathan Austin 1:8aa5cdb4ab67 252 status |= MICROBIT_SERIAL_RX_BUFF_INIT;
LancasterUniversity 6:2e1c2e0d8c7a 253 attach(this, &MicroBitSerial::dataReceived, Serial::RxIrq);
Jonathan Austin 1:8aa5cdb4ab67 254
Jonathan Austin 1:8aa5cdb4ab67 255 return MICROBIT_OK;
Jonathan Austin 1:8aa5cdb4ab67 256 }
Jonathan Austin 1:8aa5cdb4ab67 257
Jonathan Austin 1:8aa5cdb4ab67 258 /**
Jonathan Austin 1:8aa5cdb4ab67 259 * We do not want to always have our buffers initialised, especially if users to not
Jonathan Austin 1:8aa5cdb4ab67 260 * use them. We only bring them up on demand.
Jonathan Austin 1:8aa5cdb4ab67 261 */
Jonathan Austin 1:8aa5cdb4ab67 262 int MicroBitSerial::initialiseTx()
Jonathan Austin 1:8aa5cdb4ab67 263 {
Jonathan Austin 1:8aa5cdb4ab67 264 if((status & MICROBIT_SERIAL_TX_BUFF_INIT))
Jonathan Austin 1:8aa5cdb4ab67 265 {
Jonathan Austin 1:8aa5cdb4ab67 266 //ensure that we receive no interrupts after freeing our buffer
LancasterUniversity 6:2e1c2e0d8c7a 267 detach(Serial::TxIrq);
Jonathan Austin 1:8aa5cdb4ab67 268 free(this->txBuff);
Jonathan Austin 1:8aa5cdb4ab67 269 }
Jonathan Austin 1:8aa5cdb4ab67 270
Jonathan Austin 1:8aa5cdb4ab67 271 status &= ~MICROBIT_SERIAL_TX_BUFF_INIT;
Jonathan Austin 1:8aa5cdb4ab67 272
Jonathan Austin 1:8aa5cdb4ab67 273 if((this->txBuff = (uint8_t *)malloc(txBuffSize)) == NULL)
Jonathan Austin 1:8aa5cdb4ab67 274 return MICROBIT_NO_RESOURCES;
Jonathan Austin 1:8aa5cdb4ab67 275
Jonathan Austin 1:8aa5cdb4ab67 276 this->txBuffHead = 0;
Jonathan Austin 1:8aa5cdb4ab67 277 this->txBuffTail = 0;
Jonathan Austin 1:8aa5cdb4ab67 278
Jonathan Austin 1:8aa5cdb4ab67 279 status |= MICROBIT_SERIAL_TX_BUFF_INIT;
Jonathan Austin 1:8aa5cdb4ab67 280
Jonathan Austin 1:8aa5cdb4ab67 281 return MICROBIT_OK;
Jonathan Austin 1:8aa5cdb4ab67 282 }
Jonathan Austin 1:8aa5cdb4ab67 283
Jonathan Austin 1:8aa5cdb4ab67 284 /**
Jonathan Austin 1:8aa5cdb4ab67 285 * An internal method that either spin waits if mode is set to SYNC_SPINWAIT
Jonathan Austin 1:8aa5cdb4ab67 286 * or puts the fiber to sleep if the mode is set to SYNC_SLEEP
Jonathan Austin 1:8aa5cdb4ab67 287 *
Jonathan Austin 1:8aa5cdb4ab67 288 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP
Jonathan Austin 1:8aa5cdb4ab67 289 */
Jonathan Austin 1:8aa5cdb4ab67 290 void MicroBitSerial::send(MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 291 {
Jonathan Austin 1:8aa5cdb4ab67 292 if(mode == SYNC_SPINWAIT)
Jonathan Austin 1:8aa5cdb4ab67 293 while(txBufferedSize() > 0);
Jonathan Austin 1:8aa5cdb4ab67 294
Jonathan Austin 1:8aa5cdb4ab67 295 if(mode == SYNC_SLEEP)
Jonathan Austin 1:8aa5cdb4ab67 296 fiber_sleep(0);
Jonathan Austin 1:8aa5cdb4ab67 297 }
Jonathan Austin 1:8aa5cdb4ab67 298
Jonathan Austin 1:8aa5cdb4ab67 299 /**
Jonathan Austin 1:8aa5cdb4ab67 300 * Reads a single character from the rxBuff
Jonathan Austin 1:8aa5cdb4ab67 301 *
Jonathan Austin 1:8aa5cdb4ab67 302 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP. Each mode
Jonathan Austin 1:8aa5cdb4ab67 303 * gives a different behaviour:
Jonathan Austin 1:8aa5cdb4ab67 304 *
Jonathan Austin 1:8aa5cdb4ab67 305 * ASYNC - A character is read from the rxBuff if available, if there
Jonathan Austin 1:8aa5cdb4ab67 306 * are no characters to be read, a value of zero is returned immediately.
Jonathan Austin 1:8aa5cdb4ab67 307 *
Jonathan Austin 1:8aa5cdb4ab67 308 * SYNC_SPINWAIT - A character is read from the rxBuff if available, if there
Jonathan Austin 1:8aa5cdb4ab67 309 * are no characters to be read, this method will spin
Jonathan Austin 1:8aa5cdb4ab67 310 * (lock up the processor) until a character is available.
Jonathan Austin 1:8aa5cdb4ab67 311 *
Jonathan Austin 1:8aa5cdb4ab67 312 * SYNC_SLEEP - A character is read from the rxBuff if available, if there
Jonathan Austin 1:8aa5cdb4ab67 313 * are no characters to be read, the calling fiber sleeps
Jonathan Austin 1:8aa5cdb4ab67 314 * until there is a character available.
Jonathan Austin 1:8aa5cdb4ab67 315 *
Jonathan Austin 1:8aa5cdb4ab67 316 * Defaults to SYNC_SLEEP.
Jonathan Austin 1:8aa5cdb4ab67 317 *
Jonathan Austin 1:8aa5cdb4ab67 318 * @return a character from the circular buffer, or MICROBIT_NO_DATA is there
Jonathan Austin 1:8aa5cdb4ab67 319 * are no characters in the buffer.
Jonathan Austin 1:8aa5cdb4ab67 320 */
Jonathan Austin 1:8aa5cdb4ab67 321 int MicroBitSerial::getChar(MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 322 {
Jonathan Austin 1:8aa5cdb4ab67 323 if(mode == ASYNC)
Jonathan Austin 1:8aa5cdb4ab67 324 {
Jonathan Austin 1:8aa5cdb4ab67 325 if(!isReadable())
Jonathan Austin 1:8aa5cdb4ab67 326 return MICROBIT_NO_DATA;
Jonathan Austin 1:8aa5cdb4ab67 327 }
Jonathan Austin 1:8aa5cdb4ab67 328
Jonathan Austin 1:8aa5cdb4ab67 329 if(mode == SYNC_SPINWAIT)
Jonathan Austin 1:8aa5cdb4ab67 330 while(!isReadable());
Jonathan Austin 1:8aa5cdb4ab67 331
Jonathan Austin 1:8aa5cdb4ab67 332 if(mode == SYNC_SLEEP)
Jonathan Austin 1:8aa5cdb4ab67 333 {
Jonathan Austin 1:8aa5cdb4ab67 334 if(!isReadable())
Jonathan Austin 1:8aa5cdb4ab67 335 eventAfter(1, mode);
Jonathan Austin 1:8aa5cdb4ab67 336 }
Jonathan Austin 1:8aa5cdb4ab67 337
Jonathan Austin 1:8aa5cdb4ab67 338 char c = rxBuff[rxBuffTail];
Jonathan Austin 1:8aa5cdb4ab67 339
Jonathan Austin 1:8aa5cdb4ab67 340 rxBuffTail = (rxBuffTail + 1) % rxBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 341
Jonathan Austin 1:8aa5cdb4ab67 342 return c;
Jonathan Austin 1:8aa5cdb4ab67 343 }
Jonathan Austin 1:8aa5cdb4ab67 344
Jonathan Austin 1:8aa5cdb4ab67 345 /**
Jonathan Austin 1:8aa5cdb4ab67 346 * An internal method that copies values from a circular buffer to a linear buffer.
Jonathan Austin 1:8aa5cdb4ab67 347 *
Jonathan Austin 1:8aa5cdb4ab67 348 * @param circularBuff a pointer to the source circular buffer
Jonathan Austin 1:8aa5cdb4ab67 349 *
Jonathan Austin 1:8aa5cdb4ab67 350 * @param circularBuffSize the size of the circular buffer
Jonathan Austin 1:8aa5cdb4ab67 351 *
Jonathan Austin 1:8aa5cdb4ab67 352 * @param linearBuff a pointer to the destination linear buffer
Jonathan Austin 1:8aa5cdb4ab67 353 *
Jonathan Austin 1:8aa5cdb4ab67 354 * @param tailPosition the tail position in the circular buffer you want to copy from
Jonathan Austin 1:8aa5cdb4ab67 355 *
Jonathan Austin 1:8aa5cdb4ab67 356 * @param headPosition the head position in the circular buffer you want to copy to
Jonathan Austin 1:8aa5cdb4ab67 357 *
Jonathan Austin 1:8aa5cdb4ab67 358 * @note this method assumes that the linear buffer has the appropriate amount of
Jonathan Austin 1:8aa5cdb4ab67 359 * memory to contain the copy operation
Jonathan Austin 1:8aa5cdb4ab67 360 */
Jonathan Austin 1:8aa5cdb4ab67 361 void MicroBitSerial::circularCopy(uint8_t *circularBuff, uint8_t circularBuffSize, uint8_t *linearBuff, uint16_t tailPosition, uint16_t headPosition)
Jonathan Austin 1:8aa5cdb4ab67 362 {
Jonathan Austin 1:8aa5cdb4ab67 363 int toBuffIndex = 0;
Jonathan Austin 1:8aa5cdb4ab67 364
Jonathan Austin 1:8aa5cdb4ab67 365 while(tailPosition != headPosition)
Jonathan Austin 1:8aa5cdb4ab67 366 {
Jonathan Austin 1:8aa5cdb4ab67 367 linearBuff[toBuffIndex++] = circularBuff[tailPosition];
Jonathan Austin 1:8aa5cdb4ab67 368
Jonathan Austin 1:8aa5cdb4ab67 369 tailPosition = (tailPosition + 1) % circularBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 370 }
Jonathan Austin 1:8aa5cdb4ab67 371 }
Jonathan Austin 1:8aa5cdb4ab67 372
Jonathan Austin 1:8aa5cdb4ab67 373 /**
Jonathan Austin 1:8aa5cdb4ab67 374 * Sends a single character over the serial line.
Jonathan Austin 1:8aa5cdb4ab67 375 *
Jonathan Austin 1:8aa5cdb4ab67 376 * @param c the character to send
Jonathan Austin 1:8aa5cdb4ab67 377 *
Jonathan Austin 1:8aa5cdb4ab67 378 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP. Each mode
Jonathan Austin 1:8aa5cdb4ab67 379 * gives a different behaviour:
Jonathan Austin 1:8aa5cdb4ab67 380 *
Jonathan Austin 1:8aa5cdb4ab67 381 * ASYNC - the character is copied into the txBuff and returns immediately.
Jonathan Austin 1:8aa5cdb4ab67 382 *
Jonathan Austin 1:8aa5cdb4ab67 383 * SYNC_SPINWAIT - the character is copied into the txBuff and this method
Jonathan Austin 1:8aa5cdb4ab67 384 * will spin (lock up the processor) until the character has
Jonathan Austin 1:8aa5cdb4ab67 385 * been sent.
Jonathan Austin 1:8aa5cdb4ab67 386 *
Jonathan Austin 1:8aa5cdb4ab67 387 * SYNC_SLEEP - the character is copied into the txBuff and the fiber sleeps
Jonathan Austin 1:8aa5cdb4ab67 388 * until the character has been sent. This allows other fibers
Jonathan Austin 1:8aa5cdb4ab67 389 * to continue execution.
Jonathan Austin 1:8aa5cdb4ab67 390 *
Jonathan Austin 1:8aa5cdb4ab67 391 * Defaults to SYNC_SLEEP.
Jonathan Austin 1:8aa5cdb4ab67 392 *
Jonathan Austin 1:8aa5cdb4ab67 393 * @return the number of bytes written, or MICROBIT_SERIAL_IN_USE if another fiber
Jonathan Austin 1:8aa5cdb4ab67 394 * is using the serial instance for transmission.
Jonathan Austin 1:8aa5cdb4ab67 395 */
Jonathan Austin 1:8aa5cdb4ab67 396 int MicroBitSerial::sendChar(char c, MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 397 {
Jonathan Austin 1:8aa5cdb4ab67 398 if(txInUse())
Jonathan Austin 1:8aa5cdb4ab67 399 return MICROBIT_SERIAL_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 400
Jonathan Austin 1:8aa5cdb4ab67 401 lockTx();
Jonathan Austin 1:8aa5cdb4ab67 402
Jonathan Austin 1:8aa5cdb4ab67 403 //lazy initialisation of our tx buffer
Jonathan Austin 1:8aa5cdb4ab67 404 if(!(status & MICROBIT_SERIAL_TX_BUFF_INIT))
Jonathan Austin 1:8aa5cdb4ab67 405 {
Jonathan Austin 1:8aa5cdb4ab67 406 int result = initialiseTx();
Jonathan Austin 1:8aa5cdb4ab67 407
Jonathan Austin 1:8aa5cdb4ab67 408 if(result != MICROBIT_OK)
Jonathan Austin 1:8aa5cdb4ab67 409 return result;
Jonathan Austin 1:8aa5cdb4ab67 410 }
Jonathan Austin 1:8aa5cdb4ab67 411
Jonathan Austin 1:8aa5cdb4ab67 412 uint8_t toTransmit[2] = { c, '\0'};
Jonathan Austin 1:8aa5cdb4ab67 413
LancasterUniversity 25:27299423d813 414 int bytesWritten = setTxInterrupt(toTransmit, 1, mode);
Jonathan Austin 1:8aa5cdb4ab67 415
Jonathan Austin 1:8aa5cdb4ab67 416 send(mode);
Jonathan Austin 1:8aa5cdb4ab67 417
Jonathan Austin 1:8aa5cdb4ab67 418 unlockTx();
Jonathan Austin 1:8aa5cdb4ab67 419
Jonathan Austin 1:8aa5cdb4ab67 420 return bytesWritten;
Jonathan Austin 1:8aa5cdb4ab67 421 }
Jonathan Austin 1:8aa5cdb4ab67 422
Jonathan Austin 1:8aa5cdb4ab67 423 /**
Jonathan Austin 1:8aa5cdb4ab67 424 * Sends a ManagedString over the serial line.
Jonathan Austin 1:8aa5cdb4ab67 425 *
Jonathan Austin 1:8aa5cdb4ab67 426 * @param s the string to send
Jonathan Austin 1:8aa5cdb4ab67 427 *
Jonathan Austin 1:8aa5cdb4ab67 428 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP. Each mode
Jonathan Austin 1:8aa5cdb4ab67 429 * gives a different behaviour:
Jonathan Austin 1:8aa5cdb4ab67 430 *
Jonathan Austin 1:8aa5cdb4ab67 431 * ASYNC - bytes are copied into the txBuff and returns immediately.
Jonathan Austin 1:8aa5cdb4ab67 432 *
Jonathan Austin 1:8aa5cdb4ab67 433 * SYNC_SPINWAIT - bytes are copied into the txBuff and this method
Jonathan Austin 1:8aa5cdb4ab67 434 * will spin (lock up the processor) until all bytes
Jonathan Austin 1:8aa5cdb4ab67 435 * have been sent.
Jonathan Austin 1:8aa5cdb4ab67 436 *
Jonathan Austin 1:8aa5cdb4ab67 437 * SYNC_SLEEP - bytes are copied into the txBuff and the fiber sleeps
Jonathan Austin 1:8aa5cdb4ab67 438 * until all bytes have been sent. This allows other fibers
Jonathan Austin 1:8aa5cdb4ab67 439 * to continue execution.
Jonathan Austin 1:8aa5cdb4ab67 440 *
Jonathan Austin 1:8aa5cdb4ab67 441 * Defaults to SYNC_SLEEP.
Jonathan Austin 1:8aa5cdb4ab67 442 *
Jonathan Austin 1:8aa5cdb4ab67 443 * @return the number of bytes written, or MICROBIT_SERIAL_IN_USE if another fiber
Jonathan Austin 1:8aa5cdb4ab67 444 * is using the serial instance for transmission.
Jonathan Austin 1:8aa5cdb4ab67 445 */
Jonathan Austin 1:8aa5cdb4ab67 446 int MicroBitSerial::send(ManagedString s, MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 447 {
Jonathan Austin 1:8aa5cdb4ab67 448 return send((uint8_t *)s.toCharArray(), s.length(), mode);
Jonathan Austin 1:8aa5cdb4ab67 449 }
Jonathan Austin 1:8aa5cdb4ab67 450
Jonathan Austin 1:8aa5cdb4ab67 451 /**
Jonathan Austin 1:8aa5cdb4ab67 452 * Sends a buffer of known length over the serial line.
Jonathan Austin 1:8aa5cdb4ab67 453 *
Jonathan Austin 1:8aa5cdb4ab67 454 * @param buffer a pointer to the first character of the buffer
Jonathan Austin 1:8aa5cdb4ab67 455 *
Jonathan Austin 1:8aa5cdb4ab67 456 * @param len the number of bytes that are safely available to read.
Jonathan Austin 1:8aa5cdb4ab67 457 *
Jonathan Austin 1:8aa5cdb4ab67 458 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP. Each mode
Jonathan Austin 1:8aa5cdb4ab67 459 * gives a different behaviour:
Jonathan Austin 1:8aa5cdb4ab67 460 *
Jonathan Austin 1:8aa5cdb4ab67 461 * ASYNC - bytes are copied into the txBuff and returns immediately.
Jonathan Austin 1:8aa5cdb4ab67 462 *
Jonathan Austin 1:8aa5cdb4ab67 463 * SYNC_SPINWAIT - bytes are copied into the txBuff and this method
Jonathan Austin 1:8aa5cdb4ab67 464 * will spin (lock up the processor) until all bytes
Jonathan Austin 1:8aa5cdb4ab67 465 * have been sent.
Jonathan Austin 1:8aa5cdb4ab67 466 *
Jonathan Austin 1:8aa5cdb4ab67 467 * SYNC_SLEEP - bytes are copied into the txBuff and the fiber sleeps
Jonathan Austin 1:8aa5cdb4ab67 468 * until all bytes have been sent. This allows other fibers
Jonathan Austin 1:8aa5cdb4ab67 469 * to continue execution.
Jonathan Austin 1:8aa5cdb4ab67 470 *
Jonathan Austin 1:8aa5cdb4ab67 471 * Defaults to SYNC_SLEEP.
Jonathan Austin 1:8aa5cdb4ab67 472 *
Jonathan Austin 1:8aa5cdb4ab67 473 * @return the number of bytes written, or MICROBIT_SERIAL_IN_USE if another fiber
Jonathan Austin 1:8aa5cdb4ab67 474 * is using the serial instance for transmission.
Jonathan Austin 1:8aa5cdb4ab67 475 */
Jonathan Austin 1:8aa5cdb4ab67 476 int MicroBitSerial::send(uint8_t *buffer, int bufferLen, MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 477 {
Jonathan Austin 1:8aa5cdb4ab67 478 if(txInUse())
Jonathan Austin 1:8aa5cdb4ab67 479 return MICROBIT_SERIAL_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 480
Jonathan Austin 1:8aa5cdb4ab67 481 lockTx();
Jonathan Austin 1:8aa5cdb4ab67 482
Jonathan Austin 1:8aa5cdb4ab67 483 //lazy initialisation of our tx buffer
Jonathan Austin 1:8aa5cdb4ab67 484 if(!(status & MICROBIT_SERIAL_TX_BUFF_INIT))
Jonathan Austin 1:8aa5cdb4ab67 485 {
Jonathan Austin 1:8aa5cdb4ab67 486 int result = initialiseTx();
Jonathan Austin 1:8aa5cdb4ab67 487
Jonathan Austin 1:8aa5cdb4ab67 488 if(result != MICROBIT_OK)
Jonathan Austin 1:8aa5cdb4ab67 489 return result;
Jonathan Austin 1:8aa5cdb4ab67 490 }
Jonathan Austin 1:8aa5cdb4ab67 491
LancasterUniversity 46:c5bb7af0a3f0 492 bool complete = false;
LancasterUniversity 46:c5bb7af0a3f0 493 int bytesWritten = 0;
Jonathan Austin 1:8aa5cdb4ab67 494
LancasterUniversity 46:c5bb7af0a3f0 495 while(!complete)
LancasterUniversity 46:c5bb7af0a3f0 496 {
LancasterUniversity 46:c5bb7af0a3f0 497 bytesWritten += setTxInterrupt(buffer + bytesWritten, bufferLen - bytesWritten, mode);
LancasterUniversity 46:c5bb7af0a3f0 498 send(mode);
LancasterUniversity 46:c5bb7af0a3f0 499
LancasterUniversity 46:c5bb7af0a3f0 500 if(mode == ASYNC || bytesWritten >= bufferLen)
LancasterUniversity 46:c5bb7af0a3f0 501 complete = true;
LancasterUniversity 46:c5bb7af0a3f0 502 }
Jonathan Austin 1:8aa5cdb4ab67 503
Jonathan Austin 1:8aa5cdb4ab67 504 unlockTx();
Jonathan Austin 1:8aa5cdb4ab67 505
Jonathan Austin 1:8aa5cdb4ab67 506 return bytesWritten;
Jonathan Austin 1:8aa5cdb4ab67 507 }
Jonathan Austin 1:8aa5cdb4ab67 508
Jonathan Austin 1:8aa5cdb4ab67 509 /**
Jonathan Austin 1:8aa5cdb4ab67 510 * Reads a single character from the rxBuff
Jonathan Austin 1:8aa5cdb4ab67 511 *
Jonathan Austin 1:8aa5cdb4ab67 512 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP. Each mode
Jonathan Austin 1:8aa5cdb4ab67 513 * gives a different behaviour:
Jonathan Austin 1:8aa5cdb4ab67 514 *
Jonathan Austin 1:8aa5cdb4ab67 515 * ASYNC - A character is read from the rxBuff if available, if there
Jonathan Austin 1:8aa5cdb4ab67 516 * are no characters to be read, a value of MICROBIT_NO_DATA is returned immediately.
Jonathan Austin 1:8aa5cdb4ab67 517 *
Jonathan Austin 1:8aa5cdb4ab67 518 * SYNC_SPINWAIT - A character is read from the rxBuff if available, if there
Jonathan Austin 1:8aa5cdb4ab67 519 * are no characters to be read, this method will spin
Jonathan Austin 1:8aa5cdb4ab67 520 * (lock up the processor) until a character is available.
Jonathan Austin 1:8aa5cdb4ab67 521 *
Jonathan Austin 1:8aa5cdb4ab67 522 * SYNC_SLEEP - A character is read from the rxBuff if available, if there
Jonathan Austin 1:8aa5cdb4ab67 523 * are no characters to be read, the calling fiber sleeps
Jonathan Austin 1:8aa5cdb4ab67 524 * until there is a character available.
Jonathan Austin 1:8aa5cdb4ab67 525 *
Jonathan Austin 1:8aa5cdb4ab67 526 * Defaults to SYNC_SLEEP.
Jonathan Austin 1:8aa5cdb4ab67 527 *
Jonathan Austin 1:8aa5cdb4ab67 528 * @return a character, MICROBIT_SERIAL_IN_USE if another fiber is using the serial instance for reception,
Jonathan Austin 1:8aa5cdb4ab67 529 * MICROBIT_NO_RESOURCES if buffer allocation did not complete successfully, or MICROBIT_NO_DATA if
Jonathan Austin 1:8aa5cdb4ab67 530 * the rx buffer is empty and the mode given is ASYNC.
Jonathan Austin 1:8aa5cdb4ab67 531 */
Jonathan Austin 1:8aa5cdb4ab67 532 int MicroBitSerial::read(MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 533 {
Jonathan Austin 1:8aa5cdb4ab67 534 if(rxInUse())
Jonathan Austin 1:8aa5cdb4ab67 535 return MICROBIT_SERIAL_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 536
Jonathan Austin 1:8aa5cdb4ab67 537 lockRx();
Jonathan Austin 1:8aa5cdb4ab67 538
Jonathan Austin 1:8aa5cdb4ab67 539 //lazy initialisation of our buffers
Jonathan Austin 1:8aa5cdb4ab67 540 if(!(status & MICROBIT_SERIAL_RX_BUFF_INIT))
Jonathan Austin 1:8aa5cdb4ab67 541 {
Jonathan Austin 1:8aa5cdb4ab67 542 int result = initialiseRx();
Jonathan Austin 1:8aa5cdb4ab67 543
Jonathan Austin 1:8aa5cdb4ab67 544 if(result != MICROBIT_OK)
Jonathan Austin 1:8aa5cdb4ab67 545 return result;
Jonathan Austin 1:8aa5cdb4ab67 546 }
Jonathan Austin 1:8aa5cdb4ab67 547
Jonathan Austin 1:8aa5cdb4ab67 548 char c = (char)getChar(mode);
Jonathan Austin 1:8aa5cdb4ab67 549
Jonathan Austin 1:8aa5cdb4ab67 550 unlockRx();
Jonathan Austin 1:8aa5cdb4ab67 551
Jonathan Austin 1:8aa5cdb4ab67 552 return c;
Jonathan Austin 1:8aa5cdb4ab67 553 }
Jonathan Austin 1:8aa5cdb4ab67 554
Jonathan Austin 1:8aa5cdb4ab67 555 /**
Jonathan Austin 1:8aa5cdb4ab67 556 * Reads multiple characters from the rxBuff and returns them as a ManagedString
Jonathan Austin 1:8aa5cdb4ab67 557 *
Jonathan Austin 1:8aa5cdb4ab67 558 * @param size the number of characters to read.
Jonathan Austin 1:8aa5cdb4ab67 559 *
Jonathan Austin 1:8aa5cdb4ab67 560 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP. Each mode
Jonathan Austin 1:8aa5cdb4ab67 561 * gives a different behaviour:
Jonathan Austin 1:8aa5cdb4ab67 562 *
Jonathan Austin 1:8aa5cdb4ab67 563 * ASYNC - If the desired number of characters are available, this will return
Jonathan Austin 1:8aa5cdb4ab67 564 * a ManagedString with the expected size. Otherwise, it will read however
Jonathan Austin 1:8aa5cdb4ab67 565 * many characters there are available.
Jonathan Austin 1:8aa5cdb4ab67 566 *
Jonathan Austin 1:8aa5cdb4ab67 567 * SYNC_SPINWAIT - If the desired number of characters are available, this will return
Jonathan Austin 1:8aa5cdb4ab67 568 * a ManagedString with the expected size. Otherwise, this method will spin
Jonathan Austin 1:8aa5cdb4ab67 569 * (lock up the processor) until the desired number of characters have been read.
Jonathan Austin 1:8aa5cdb4ab67 570 *
Jonathan Austin 1:8aa5cdb4ab67 571 * SYNC_SLEEP - If the desired number of characters are available, this will return
Jonathan Austin 1:8aa5cdb4ab67 572 * a ManagedString with the expected size. Otherwise, the calling fiber sleeps
Jonathan Austin 1:8aa5cdb4ab67 573 * until the desired number of characters have been read.
Jonathan Austin 1:8aa5cdb4ab67 574 *
Jonathan Austin 1:8aa5cdb4ab67 575 * Defaults to SYNC_SLEEP.
Jonathan Austin 1:8aa5cdb4ab67 576 *
Jonathan Austin 1:8aa5cdb4ab67 577 * @return A ManagedString, or an empty ManagedString if an error was encountered during the read.
Jonathan Austin 1:8aa5cdb4ab67 578 */
Jonathan Austin 1:8aa5cdb4ab67 579 ManagedString MicroBitSerial::read(int size, MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 580 {
LancasterUniversity 3:d86a4ddc1867 581 uint8_t buff[size + 1];
Jonathan Austin 1:8aa5cdb4ab67 582
LancasterUniversity 8:ec4465853952 583 memclr(&buff, size + 1);
LancasterUniversity 8:ec4465853952 584
Jonathan Austin 1:8aa5cdb4ab67 585 int returnedSize = read((uint8_t *)buff, size, mode);
Jonathan Austin 1:8aa5cdb4ab67 586
Jonathan Austin 1:8aa5cdb4ab67 587 if(returnedSize <= 0)
Jonathan Austin 1:8aa5cdb4ab67 588 return ManagedString();
Jonathan Austin 1:8aa5cdb4ab67 589
Jonathan Austin 1:8aa5cdb4ab67 590 return ManagedString((char *)buff, returnedSize);
Jonathan Austin 1:8aa5cdb4ab67 591 }
Jonathan Austin 1:8aa5cdb4ab67 592
Jonathan Austin 1:8aa5cdb4ab67 593 /**
Jonathan Austin 1:8aa5cdb4ab67 594 * Reads multiple characters from the rxBuff and fills a user buffer.
Jonathan Austin 1:8aa5cdb4ab67 595 *
Jonathan Austin 1:8aa5cdb4ab67 596 * @param buffer a pointer to a user allocated buffer.
Jonathan Austin 1:8aa5cdb4ab67 597 *
Jonathan Austin 1:8aa5cdb4ab67 598 * @param bufferLen the amount of data that can be safely stored
Jonathan Austin 1:8aa5cdb4ab67 599 *
Jonathan Austin 1:8aa5cdb4ab67 600 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP. Each mode
Jonathan Austin 1:8aa5cdb4ab67 601 * gives a different behaviour:
Jonathan Austin 1:8aa5cdb4ab67 602 *
Jonathan Austin 1:8aa5cdb4ab67 603 * ASYNC - If the desired number of characters are available, this will fill
Jonathan Austin 1:8aa5cdb4ab67 604 * the given buffer. Otherwise, it will fill the buffer with however
Jonathan Austin 1:8aa5cdb4ab67 605 * many characters there are available.
Jonathan Austin 1:8aa5cdb4ab67 606 *
Jonathan Austin 1:8aa5cdb4ab67 607 * SYNC_SPINWAIT - If the desired number of characters are available, this will fill
Jonathan Austin 1:8aa5cdb4ab67 608 * the given buffer. Otherwise, this method will spin (lock up the processor)
Jonathan Austin 1:8aa5cdb4ab67 609 * and fill the buffer until the desired number of characters have been read.
Jonathan Austin 1:8aa5cdb4ab67 610 *
Jonathan Austin 1:8aa5cdb4ab67 611 * SYNC_SLEEP - If the desired number of characters are available, this will fill
Jonathan Austin 1:8aa5cdb4ab67 612 * the given buffer. Otherwise, the calling fiber sleeps
Jonathan Austin 1:8aa5cdb4ab67 613 * until the desired number of characters have been read.
Jonathan Austin 1:8aa5cdb4ab67 614 *
Jonathan Austin 1:8aa5cdb4ab67 615 * Defaults to SYNC_SLEEP.
Jonathan Austin 1:8aa5cdb4ab67 616 *
Jonathan Austin 1:8aa5cdb4ab67 617 * @return the number of characters read, or MICROBIT_SERIAL_IN_USE if another fiber
Jonathan Austin 1:8aa5cdb4ab67 618 * is using the instance for receiving.
Jonathan Austin 1:8aa5cdb4ab67 619 */
Jonathan Austin 1:8aa5cdb4ab67 620 int MicroBitSerial::read(uint8_t *buffer, int bufferLen, MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 621 {
Jonathan Austin 1:8aa5cdb4ab67 622 if(rxInUse())
Jonathan Austin 1:8aa5cdb4ab67 623 return MICROBIT_SERIAL_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 624
Jonathan Austin 1:8aa5cdb4ab67 625 lockRx();
Jonathan Austin 1:8aa5cdb4ab67 626
Jonathan Austin 1:8aa5cdb4ab67 627 //lazy initialisation of our rx buffer
Jonathan Austin 1:8aa5cdb4ab67 628 if(!(status & MICROBIT_SERIAL_RX_BUFF_INIT))
Jonathan Austin 1:8aa5cdb4ab67 629 {
Jonathan Austin 1:8aa5cdb4ab67 630 int result = initialiseRx();
Jonathan Austin 1:8aa5cdb4ab67 631
Jonathan Austin 1:8aa5cdb4ab67 632 if(result != MICROBIT_OK)
Jonathan Austin 1:8aa5cdb4ab67 633 return result;
Jonathan Austin 1:8aa5cdb4ab67 634 }
Jonathan Austin 1:8aa5cdb4ab67 635
Jonathan Austin 1:8aa5cdb4ab67 636 int bufferIndex = 0;
Jonathan Austin 1:8aa5cdb4ab67 637
Jonathan Austin 1:8aa5cdb4ab67 638 int temp = 0;
Jonathan Austin 1:8aa5cdb4ab67 639
Jonathan Austin 1:8aa5cdb4ab67 640 if(mode == ASYNC)
Jonathan Austin 1:8aa5cdb4ab67 641 {
Jonathan Austin 1:8aa5cdb4ab67 642 while((temp = getChar(mode)) != MICROBIT_NO_DATA && bufferIndex < bufferLen)
Jonathan Austin 1:8aa5cdb4ab67 643 {
Jonathan Austin 1:8aa5cdb4ab67 644 buffer[bufferIndex] = (char)temp;
Jonathan Austin 1:8aa5cdb4ab67 645 bufferIndex++;
Jonathan Austin 1:8aa5cdb4ab67 646 }
Jonathan Austin 1:8aa5cdb4ab67 647 }
Jonathan Austin 1:8aa5cdb4ab67 648
Jonathan Austin 1:8aa5cdb4ab67 649 if(mode == SYNC_SPINWAIT)
Jonathan Austin 1:8aa5cdb4ab67 650 {
Jonathan Austin 1:8aa5cdb4ab67 651 while(bufferIndex < bufferLen)
Jonathan Austin 1:8aa5cdb4ab67 652 {
Jonathan Austin 1:8aa5cdb4ab67 653 buffer[bufferIndex] = (char)getChar(mode);
Jonathan Austin 1:8aa5cdb4ab67 654 bufferIndex++;
Jonathan Austin 1:8aa5cdb4ab67 655 }
Jonathan Austin 1:8aa5cdb4ab67 656 }
Jonathan Austin 1:8aa5cdb4ab67 657
Jonathan Austin 1:8aa5cdb4ab67 658 if(mode == SYNC_SLEEP)
Jonathan Austin 1:8aa5cdb4ab67 659 {
Jonathan Austin 1:8aa5cdb4ab67 660 if(bufferLen > rxBufferedSize())
Jonathan Austin 1:8aa5cdb4ab67 661 eventAfter(bufferLen - rxBufferedSize(), mode);
Jonathan Austin 1:8aa5cdb4ab67 662
Jonathan Austin 1:8aa5cdb4ab67 663 while(bufferIndex < bufferLen)
Jonathan Austin 1:8aa5cdb4ab67 664 {
Jonathan Austin 1:8aa5cdb4ab67 665 buffer[bufferIndex] = (char)getChar(mode);
Jonathan Austin 1:8aa5cdb4ab67 666 bufferIndex++;
Jonathan Austin 1:8aa5cdb4ab67 667 }
Jonathan Austin 1:8aa5cdb4ab67 668 }
Jonathan Austin 1:8aa5cdb4ab67 669
Jonathan Austin 1:8aa5cdb4ab67 670 unlockRx();
Jonathan Austin 1:8aa5cdb4ab67 671
Jonathan Austin 1:8aa5cdb4ab67 672 return bufferIndex;
Jonathan Austin 1:8aa5cdb4ab67 673 }
Jonathan Austin 1:8aa5cdb4ab67 674
Jonathan Austin 1:8aa5cdb4ab67 675
Jonathan Austin 1:8aa5cdb4ab67 676 /**
Jonathan Austin 1:8aa5cdb4ab67 677 * Reads until one of the delimeters matches a character in the rxBuff
Jonathan Austin 1:8aa5cdb4ab67 678 *
Jonathan Austin 1:8aa5cdb4ab67 679 * @param delimeters a ManagedString containing a sequence of delimeter characters e.g. ManagedString("\r\n")
Jonathan Austin 1:8aa5cdb4ab67 680 *
Jonathan Austin 1:8aa5cdb4ab67 681 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP. Each mode
Jonathan Austin 1:8aa5cdb4ab67 682 * gives a different behaviour:
Jonathan Austin 1:8aa5cdb4ab67 683 *
Jonathan Austin 1:8aa5cdb4ab67 684 * ASYNC - If one of the delimeters matches a character already in the rxBuff
Jonathan Austin 1:8aa5cdb4ab67 685 * this method will return a ManagedString up to the delimeter.
Jonathan Austin 1:8aa5cdb4ab67 686 * Otherwise, it will return an Empty ManagedString.
Jonathan Austin 1:8aa5cdb4ab67 687 *
Jonathan Austin 1:8aa5cdb4ab67 688 * SYNC_SPINWAIT - If one of the delimeters matches a character already in the rxBuff
Jonathan Austin 1:8aa5cdb4ab67 689 * this method will return a ManagedString up to the delimeter.
Jonathan Austin 1:8aa5cdb4ab67 690 * Otherwise, this method will spin (lock up the processor) until a
Jonathan Austin 1:8aa5cdb4ab67 691 * received character matches one of the delimeters.
Jonathan Austin 1:8aa5cdb4ab67 692 *
Jonathan Austin 1:8aa5cdb4ab67 693 * SYNC_SLEEP - If one of the delimeters matches a character already in the rxBuff
Jonathan Austin 1:8aa5cdb4ab67 694 * this method will return a ManagedString up to the delimeter.
Jonathan Austin 1:8aa5cdb4ab67 695 * Otherwise, the calling fiber sleeps until a character matching one
Jonathan Austin 1:8aa5cdb4ab67 696 * of the delimeters is seen.
Jonathan Austin 1:8aa5cdb4ab67 697 *
Jonathan Austin 1:8aa5cdb4ab67 698 * Defaults to SYNC_SLEEP.
Jonathan Austin 1:8aa5cdb4ab67 699 *
Jonathan Austin 1:8aa5cdb4ab67 700 * @return A ManagedString containing the characters up to a delimeter, or an Empty ManagedString,
Jonathan Austin 1:8aa5cdb4ab67 701 * if another fiber is currently using this instance for reception.
Jonathan Austin 1:8aa5cdb4ab67 702 *
Jonathan Austin 1:8aa5cdb4ab67 703 * @note delimeters are matched on a per byte basis.
Jonathan Austin 1:8aa5cdb4ab67 704 */
Jonathan Austin 1:8aa5cdb4ab67 705 ManagedString MicroBitSerial::readUntil(ManagedString delimeters, MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 706 {
Jonathan Austin 1:8aa5cdb4ab67 707
Jonathan Austin 1:8aa5cdb4ab67 708 if(rxInUse())
Jonathan Austin 1:8aa5cdb4ab67 709 return ManagedString();
Jonathan Austin 1:8aa5cdb4ab67 710
Jonathan Austin 1:8aa5cdb4ab67 711 //lazy initialisation of our rx buffer
Jonathan Austin 1:8aa5cdb4ab67 712 if(!(status & MICROBIT_SERIAL_RX_BUFF_INIT))
Jonathan Austin 1:8aa5cdb4ab67 713 {
Jonathan Austin 1:8aa5cdb4ab67 714 int result = initialiseRx();
Jonathan Austin 1:8aa5cdb4ab67 715
Jonathan Austin 1:8aa5cdb4ab67 716 if(result != MICROBIT_OK)
Jonathan Austin 1:8aa5cdb4ab67 717 return result;
Jonathan Austin 1:8aa5cdb4ab67 718 }
Jonathan Austin 1:8aa5cdb4ab67 719
Jonathan Austin 1:8aa5cdb4ab67 720 lockRx();
Jonathan Austin 1:8aa5cdb4ab67 721
Jonathan Austin 1:8aa5cdb4ab67 722 int localTail = rxBuffTail;
Jonathan Austin 1:8aa5cdb4ab67 723 int preservedTail = rxBuffTail;
Jonathan Austin 1:8aa5cdb4ab67 724
Jonathan Austin 1:8aa5cdb4ab67 725 int foundIndex = -1;
Jonathan Austin 1:8aa5cdb4ab67 726
Jonathan Austin 1:8aa5cdb4ab67 727 //ASYNC mode just iterates through our stored characters checking for any matches.
Jonathan Austin 1:8aa5cdb4ab67 728 while(localTail != rxBuffHead && foundIndex == -1)
Jonathan Austin 1:8aa5cdb4ab67 729 {
Jonathan Austin 1:8aa5cdb4ab67 730 //we use localTail to prevent modification of the actual tail.
Jonathan Austin 1:8aa5cdb4ab67 731 char c = rxBuff[localTail];
Jonathan Austin 1:8aa5cdb4ab67 732
Jonathan Austin 1:8aa5cdb4ab67 733 for(int delimeterIterator = 0; delimeterIterator < delimeters.length(); delimeterIterator++)
Jonathan Austin 1:8aa5cdb4ab67 734 if(delimeters.charAt(delimeterIterator) == c)
Jonathan Austin 1:8aa5cdb4ab67 735 foundIndex = localTail;
Jonathan Austin 1:8aa5cdb4ab67 736
Jonathan Austin 1:8aa5cdb4ab67 737 localTail = (localTail + 1) % rxBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 738 }
Jonathan Austin 1:8aa5cdb4ab67 739
Jonathan Austin 1:8aa5cdb4ab67 740 //if our mode is SYNC_SPINWAIT and we didn't see any matching characters in our buffer
Jonathan Austin 1:8aa5cdb4ab67 741 //spin until we find a match!
Jonathan Austin 1:8aa5cdb4ab67 742 if(mode == SYNC_SPINWAIT)
Jonathan Austin 1:8aa5cdb4ab67 743 {
Jonathan Austin 1:8aa5cdb4ab67 744 while(foundIndex == -1)
Jonathan Austin 1:8aa5cdb4ab67 745 {
Jonathan Austin 1:8aa5cdb4ab67 746 while(localTail == rxBuffHead);
Jonathan Austin 1:8aa5cdb4ab67 747
Jonathan Austin 1:8aa5cdb4ab67 748 char c = rxBuff[localTail];
Jonathan Austin 1:8aa5cdb4ab67 749
Jonathan Austin 1:8aa5cdb4ab67 750 for(int delimeterIterator = 0; delimeterIterator < delimeters.length(); delimeterIterator++)
Jonathan Austin 1:8aa5cdb4ab67 751 if(delimeters.charAt(delimeterIterator) == c)
Jonathan Austin 1:8aa5cdb4ab67 752 foundIndex = localTail;
Jonathan Austin 1:8aa5cdb4ab67 753
Jonathan Austin 1:8aa5cdb4ab67 754 localTail = (localTail + 1) % rxBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 755 }
Jonathan Austin 1:8aa5cdb4ab67 756 }
Jonathan Austin 1:8aa5cdb4ab67 757
Jonathan Austin 1:8aa5cdb4ab67 758 //if our mode is SYNC_SLEEP, we set up an event to be fired when we see a
Jonathan Austin 1:8aa5cdb4ab67 759 //matching character.
Jonathan Austin 1:8aa5cdb4ab67 760 if(mode == SYNC_SLEEP && foundIndex == -1)
Jonathan Austin 1:8aa5cdb4ab67 761 {
Jonathan Austin 1:8aa5cdb4ab67 762 eventOn(delimeters, mode);
Jonathan Austin 1:8aa5cdb4ab67 763
Jonathan Austin 1:8aa5cdb4ab67 764 foundIndex = rxBuffHead - 1;
Jonathan Austin 1:8aa5cdb4ab67 765
Jonathan Austin 1:8aa5cdb4ab67 766 this->delimeters = ManagedString();
Jonathan Austin 1:8aa5cdb4ab67 767 }
Jonathan Austin 1:8aa5cdb4ab67 768
Jonathan Austin 1:8aa5cdb4ab67 769 if(foundIndex >= 0)
Jonathan Austin 1:8aa5cdb4ab67 770 {
Jonathan Austin 1:8aa5cdb4ab67 771 //calculate our local buffer size
Jonathan Austin 1:8aa5cdb4ab67 772 int localBuffSize = (preservedTail > foundIndex) ? (rxBuffSize - preservedTail) + foundIndex : foundIndex - preservedTail;
Jonathan Austin 1:8aa5cdb4ab67 773
LancasterUniversity 3:d86a4ddc1867 774 uint8_t localBuff[localBuffSize + 1];
Jonathan Austin 1:8aa5cdb4ab67 775
LancasterUniversity 8:ec4465853952 776 memclr(&localBuff, localBuffSize + 1);
LancasterUniversity 8:ec4465853952 777
Jonathan Austin 1:8aa5cdb4ab67 778 circularCopy(rxBuff, rxBuffSize, localBuff, preservedTail, foundIndex);
Jonathan Austin 1:8aa5cdb4ab67 779
Jonathan Austin 1:8aa5cdb4ab67 780 //plus one for the character we listened for...
Jonathan Austin 1:8aa5cdb4ab67 781 rxBuffTail = (rxBuffTail + localBuffSize + 1) % rxBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 782
Jonathan Austin 1:8aa5cdb4ab67 783 unlockRx();
Jonathan Austin 1:8aa5cdb4ab67 784
Jonathan Austin 1:8aa5cdb4ab67 785 return ManagedString((char *)localBuff, localBuffSize);
Jonathan Austin 1:8aa5cdb4ab67 786 }
Jonathan Austin 1:8aa5cdb4ab67 787
Jonathan Austin 1:8aa5cdb4ab67 788 unlockRx();
Jonathan Austin 1:8aa5cdb4ab67 789
Jonathan Austin 1:8aa5cdb4ab67 790 return ManagedString();
Jonathan Austin 1:8aa5cdb4ab67 791 }
Jonathan Austin 1:8aa5cdb4ab67 792
Jonathan Austin 1:8aa5cdb4ab67 793 /**
Jonathan Austin 1:8aa5cdb4ab67 794 * A wrapper around the inherited method "baud" so we can trap the baud rate
Jonathan Austin 1:8aa5cdb4ab67 795 * as it changes and restore it if redirect() is called.
Jonathan Austin 1:8aa5cdb4ab67 796 *
Jonathan Austin 1:8aa5cdb4ab67 797 * @param baudrate the new baudrate. See:
Jonathan Austin 1:8aa5cdb4ab67 798 * - https://github.com/mbedmicro/mbed/blob/master/libraries/mbed/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/serial_api.c
Jonathan Austin 1:8aa5cdb4ab67 799 * for permitted baud rates.
Jonathan Austin 1:8aa5cdb4ab67 800 *
Jonathan Austin 1:8aa5cdb4ab67 801 * @return MICROBIT_INVALID_PARAMETER if baud rate is less than 0, otherwise MICROBIT_OK.
Jonathan Austin 1:8aa5cdb4ab67 802 *
Jonathan Austin 1:8aa5cdb4ab67 803 * @note the underlying implementation chooses the first allowable rate at or above that requested.
Jonathan Austin 1:8aa5cdb4ab67 804 */
Jonathan Austin 1:8aa5cdb4ab67 805 void MicroBitSerial::baud(int baudrate)
Jonathan Austin 1:8aa5cdb4ab67 806 {
Jonathan Austin 1:8aa5cdb4ab67 807 if(baudrate < 0)
Jonathan Austin 1:8aa5cdb4ab67 808 return;
Jonathan Austin 1:8aa5cdb4ab67 809
Jonathan Austin 1:8aa5cdb4ab67 810 this->baudrate = baudrate;
Jonathan Austin 1:8aa5cdb4ab67 811
Jonathan Austin 1:8aa5cdb4ab67 812 RawSerial::baud(baudrate);
Jonathan Austin 1:8aa5cdb4ab67 813 }
Jonathan Austin 1:8aa5cdb4ab67 814
Jonathan Austin 1:8aa5cdb4ab67 815 /**
Jonathan Austin 1:8aa5cdb4ab67 816 * A way of dynamically configuring the serial instance to use pins other than USBTX and USBRX.
Jonathan Austin 1:8aa5cdb4ab67 817 *
Jonathan Austin 1:8aa5cdb4ab67 818 * @param tx the new transmission pin.
Jonathan Austin 1:8aa5cdb4ab67 819 *
Jonathan Austin 1:8aa5cdb4ab67 820 * @param rx the new reception pin.
Jonathan Austin 1:8aa5cdb4ab67 821 *
Jonathan Austin 1:8aa5cdb4ab67 822 * @return MICROBIT_SERIAL_IN_USE if another fiber is currently transmitting or receiving, otherwise MICROBIT_OK.
Jonathan Austin 1:8aa5cdb4ab67 823 */
Jonathan Austin 1:8aa5cdb4ab67 824 int MicroBitSerial::redirect(PinName tx, PinName rx)
Jonathan Austin 1:8aa5cdb4ab67 825 {
Jonathan Austin 1:8aa5cdb4ab67 826 if(txInUse() || rxInUse())
Jonathan Austin 1:8aa5cdb4ab67 827 return MICROBIT_SERIAL_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 828
Jonathan Austin 1:8aa5cdb4ab67 829 lockTx();
Jonathan Austin 1:8aa5cdb4ab67 830 lockRx();
Jonathan Austin 1:8aa5cdb4ab67 831
Jonathan Austin 1:8aa5cdb4ab67 832 if(txBufferedSize() > 0)
LancasterUniversity 6:2e1c2e0d8c7a 833 detach(Serial::TxIrq);
Jonathan Austin 1:8aa5cdb4ab67 834
LancasterUniversity 6:2e1c2e0d8c7a 835 detach(Serial::RxIrq);
Jonathan Austin 1:8aa5cdb4ab67 836
Jonathan Austin 1:8aa5cdb4ab67 837 serial_free(&_serial);
Jonathan Austin 1:8aa5cdb4ab67 838 serial_init(&_serial, tx, rx);
Jonathan Austin 1:8aa5cdb4ab67 839
LancasterUniversity 6:2e1c2e0d8c7a 840 attach(this, &MicroBitSerial::dataReceived, Serial::RxIrq);
Jonathan Austin 1:8aa5cdb4ab67 841
Jonathan Austin 1:8aa5cdb4ab67 842 if(txBufferedSize() > 0)
LancasterUniversity 6:2e1c2e0d8c7a 843 attach(this, &MicroBitSerial::dataWritten, Serial::TxIrq);
Jonathan Austin 1:8aa5cdb4ab67 844
Jonathan Austin 1:8aa5cdb4ab67 845 this->baud(this->baudrate);
Jonathan Austin 1:8aa5cdb4ab67 846
Jonathan Austin 1:8aa5cdb4ab67 847 unlockRx();
Jonathan Austin 1:8aa5cdb4ab67 848 unlockTx();
Jonathan Austin 1:8aa5cdb4ab67 849
Jonathan Austin 1:8aa5cdb4ab67 850 return MICROBIT_OK;
Jonathan Austin 1:8aa5cdb4ab67 851 }
Jonathan Austin 1:8aa5cdb4ab67 852
Jonathan Austin 1:8aa5cdb4ab67 853 /**
Jonathan Austin 1:8aa5cdb4ab67 854 * Configures an event to be fired after "len" characters.
Jonathan Austin 1:8aa5cdb4ab67 855 *
LancasterUniversity 59:d73a257e9f89 856 * Will generate an event with the ID: MICROBIT_ID_SERIAL and the value MICROBIT_SERIAL_EVT_HEAD_MATCH.
LancasterUniversity 59:d73a257e9f89 857 *
Jonathan Austin 1:8aa5cdb4ab67 858 * @param len the number of characters to wait before triggering the event.
Jonathan Austin 1:8aa5cdb4ab67 859 *
Jonathan Austin 1:8aa5cdb4ab67 860 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP. Each mode
Jonathan Austin 1:8aa5cdb4ab67 861 * gives a different behaviour:
Jonathan Austin 1:8aa5cdb4ab67 862 *
Jonathan Austin 1:8aa5cdb4ab67 863 * ASYNC - Will configure the event and return immediately.
Jonathan Austin 1:8aa5cdb4ab67 864 *
Jonathan Austin 1:8aa5cdb4ab67 865 * SYNC_SPINWAIT - will return MICROBIT_INVALID_PARAMETER
Jonathan Austin 1:8aa5cdb4ab67 866 *
Jonathan Austin 1:8aa5cdb4ab67 867 * SYNC_SLEEP - Will configure the event and block the current fiber until the
Jonathan Austin 1:8aa5cdb4ab67 868 * event is received.
Jonathan Austin 1:8aa5cdb4ab67 869 *
Jonathan Austin 1:8aa5cdb4ab67 870 * @return MICROBIT_INVALID_PARAMETER if the mode given is SYNC_SPINWAIT, otherwise MICROBIT_OK.
Jonathan Austin 1:8aa5cdb4ab67 871 */
Jonathan Austin 1:8aa5cdb4ab67 872 int MicroBitSerial::eventAfter(int len, MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 873 {
Jonathan Austin 1:8aa5cdb4ab67 874 if(mode == SYNC_SPINWAIT)
Jonathan Austin 1:8aa5cdb4ab67 875 return MICROBIT_INVALID_PARAMETER;
Jonathan Austin 1:8aa5cdb4ab67 876
Jonathan Austin 1:8aa5cdb4ab67 877 //configure our head match...
Jonathan Austin 1:8aa5cdb4ab67 878 this->rxBuffHeadMatch = (rxBuffHead + len) % rxBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 879
Jonathan Austin 1:8aa5cdb4ab67 880 //block!
Jonathan Austin 1:8aa5cdb4ab67 881 if(mode == SYNC_SLEEP)
Jonathan Austin 1:8aa5cdb4ab67 882 fiber_wait_for_event(MICROBIT_ID_SERIAL, MICROBIT_SERIAL_EVT_HEAD_MATCH);
Jonathan Austin 1:8aa5cdb4ab67 883
Jonathan Austin 1:8aa5cdb4ab67 884 return MICROBIT_OK;
Jonathan Austin 1:8aa5cdb4ab67 885 }
Jonathan Austin 1:8aa5cdb4ab67 886
Jonathan Austin 1:8aa5cdb4ab67 887 /**
Jonathan Austin 1:8aa5cdb4ab67 888 * Configures an event to be fired on a match with one of the delimeters.
Jonathan Austin 1:8aa5cdb4ab67 889 *
LancasterUniversity 59:d73a257e9f89 890 * Will generate an event with the ID: MICROBIT_ID_SERIAL and the value MICROBIT_SERIAL_EVT_DELIM_MATCH.
LancasterUniversity 59:d73a257e9f89 891 *
LancasterUniversity 59:d73a257e9f89 892 * @param delimeters the characters to match received characters against e.g. ManagedString("\n")
Jonathan Austin 1:8aa5cdb4ab67 893 *
Jonathan Austin 1:8aa5cdb4ab67 894 * @param mode the selected mode, one of: ASYNC, SYNC_SPINWAIT, SYNC_SLEEP. Each mode
Jonathan Austin 1:8aa5cdb4ab67 895 * gives a different behaviour:
Jonathan Austin 1:8aa5cdb4ab67 896 *
Jonathan Austin 1:8aa5cdb4ab67 897 * ASYNC - Will configure the event and return immediately.
Jonathan Austin 1:8aa5cdb4ab67 898 *
Jonathan Austin 1:8aa5cdb4ab67 899 * SYNC_SPINWAIT - will return MICROBIT_INVALID_PARAMETER
Jonathan Austin 1:8aa5cdb4ab67 900 *
Jonathan Austin 1:8aa5cdb4ab67 901 * SYNC_SLEEP - Will configure the event and block the current fiber until the
Jonathan Austin 1:8aa5cdb4ab67 902 * event is received.
Jonathan Austin 1:8aa5cdb4ab67 903 *
Jonathan Austin 1:8aa5cdb4ab67 904 * @return MICROBIT_INVALID_PARAMETER if the mode given is SYNC_SPINWAIT, otherwise MICROBIT_OK.
Jonathan Austin 1:8aa5cdb4ab67 905 *
Jonathan Austin 1:8aa5cdb4ab67 906 * @note delimeters are matched on a per byte basis.
Jonathan Austin 1:8aa5cdb4ab67 907 */
Jonathan Austin 1:8aa5cdb4ab67 908 int MicroBitSerial::eventOn(ManagedString delimeters, MicroBitSerialMode mode)
Jonathan Austin 1:8aa5cdb4ab67 909 {
Jonathan Austin 1:8aa5cdb4ab67 910 if(mode == SYNC_SPINWAIT)
Jonathan Austin 1:8aa5cdb4ab67 911 return MICROBIT_INVALID_PARAMETER;
Jonathan Austin 1:8aa5cdb4ab67 912
Jonathan Austin 1:8aa5cdb4ab67 913 //configure our head match...
Jonathan Austin 1:8aa5cdb4ab67 914 this->delimeters = delimeters;
Jonathan Austin 1:8aa5cdb4ab67 915
Jonathan Austin 1:8aa5cdb4ab67 916 //block!
Jonathan Austin 1:8aa5cdb4ab67 917 if(mode == SYNC_SLEEP)
Jonathan Austin 1:8aa5cdb4ab67 918 fiber_wait_for_event(MICROBIT_ID_SERIAL, MICROBIT_SERIAL_EVT_DELIM_MATCH);
Jonathan Austin 1:8aa5cdb4ab67 919
Jonathan Austin 1:8aa5cdb4ab67 920 return MICROBIT_OK;
Jonathan Austin 1:8aa5cdb4ab67 921 }
Jonathan Austin 1:8aa5cdb4ab67 922
Jonathan Austin 1:8aa5cdb4ab67 923 /**
Jonathan Austin 1:8aa5cdb4ab67 924 * Determines whether there is any data waiting in our Rx buffer.
Jonathan Austin 1:8aa5cdb4ab67 925 *
Jonathan Austin 1:8aa5cdb4ab67 926 * @return 1 if we have space, 0 if we do not.
Jonathan Austin 1:8aa5cdb4ab67 927 *
Jonathan Austin 1:8aa5cdb4ab67 928 * @note We do not wrap the super's readable() method as we don't want to
Jonathan Austin 1:8aa5cdb4ab67 929 * interfere with communities that use manual calls to serial.readable().
Jonathan Austin 1:8aa5cdb4ab67 930 */
Jonathan Austin 1:8aa5cdb4ab67 931 int MicroBitSerial::isReadable()
Jonathan Austin 1:8aa5cdb4ab67 932 {
Jonathan Austin 1:8aa5cdb4ab67 933 return (rxBuffTail != rxBuffHead) ? 1 : 0;
Jonathan Austin 1:8aa5cdb4ab67 934 }
Jonathan Austin 1:8aa5cdb4ab67 935
Jonathan Austin 1:8aa5cdb4ab67 936 /**
Jonathan Austin 1:8aa5cdb4ab67 937 * Determines if we have space in our txBuff.
Jonathan Austin 1:8aa5cdb4ab67 938 *
Jonathan Austin 1:8aa5cdb4ab67 939 * @return 1 if we have space, 0 if we do not.
Jonathan Austin 1:8aa5cdb4ab67 940 *
Jonathan Austin 1:8aa5cdb4ab67 941 * @note We do not wrap the super's writeable() method as we don't want to
Jonathan Austin 1:8aa5cdb4ab67 942 * interfere with communities that use manual calls to serial.writeable().
Jonathan Austin 1:8aa5cdb4ab67 943 */
Jonathan Austin 1:8aa5cdb4ab67 944 int MicroBitSerial::isWriteable()
Jonathan Austin 1:8aa5cdb4ab67 945 {
Jonathan Austin 1:8aa5cdb4ab67 946 return (txBuffHead != (txBuffTail - 1)) ? 1 : 0;
Jonathan Austin 1:8aa5cdb4ab67 947 }
Jonathan Austin 1:8aa5cdb4ab67 948
Jonathan Austin 1:8aa5cdb4ab67 949 /**
Jonathan Austin 1:8aa5cdb4ab67 950 * Reconfigures the size of our rxBuff
Jonathan Austin 1:8aa5cdb4ab67 951 *
Jonathan Austin 1:8aa5cdb4ab67 952 * @param size the new size for our rxBuff
Jonathan Austin 1:8aa5cdb4ab67 953 *
Jonathan Austin 1:8aa5cdb4ab67 954 * @return MICROBIT_SERIAL_IN_USE if another fiber is currently using this instance
Jonathan Austin 1:8aa5cdb4ab67 955 * for reception, otherwise MICROBIT_OK.
Jonathan Austin 1:8aa5cdb4ab67 956 */
Jonathan Austin 1:8aa5cdb4ab67 957 int MicroBitSerial::setRxBufferSize(uint8_t size)
Jonathan Austin 1:8aa5cdb4ab67 958 {
Jonathan Austin 1:8aa5cdb4ab67 959 if(rxInUse())
Jonathan Austin 1:8aa5cdb4ab67 960 return MICROBIT_SERIAL_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 961
Jonathan Austin 1:8aa5cdb4ab67 962 lockRx();
Jonathan Austin 1:8aa5cdb4ab67 963
Jonathan Austin 1:8aa5cdb4ab67 964 this->rxBuffSize = size;
Jonathan Austin 1:8aa5cdb4ab67 965
Jonathan Austin 1:8aa5cdb4ab67 966 int result = initialiseRx();
Jonathan Austin 1:8aa5cdb4ab67 967
Jonathan Austin 1:8aa5cdb4ab67 968 unlockRx();
Jonathan Austin 1:8aa5cdb4ab67 969
Jonathan Austin 1:8aa5cdb4ab67 970 return result;
Jonathan Austin 1:8aa5cdb4ab67 971 }
Jonathan Austin 1:8aa5cdb4ab67 972
Jonathan Austin 1:8aa5cdb4ab67 973 /**
Jonathan Austin 1:8aa5cdb4ab67 974 * Reconfigures the size of our txBuff
Jonathan Austin 1:8aa5cdb4ab67 975 *
Jonathan Austin 1:8aa5cdb4ab67 976 * @param size the new size for our txBuff
Jonathan Austin 1:8aa5cdb4ab67 977 *
Jonathan Austin 1:8aa5cdb4ab67 978 * @return MICROBIT_SERIAL_IN_USE if another fiber is currently using this instance
Jonathan Austin 1:8aa5cdb4ab67 979 * for transmission, otherwise MICROBIT_OK.
Jonathan Austin 1:8aa5cdb4ab67 980 */
Jonathan Austin 1:8aa5cdb4ab67 981 int MicroBitSerial::setTxBufferSize(uint8_t size)
Jonathan Austin 1:8aa5cdb4ab67 982 {
Jonathan Austin 1:8aa5cdb4ab67 983 if(txInUse())
Jonathan Austin 1:8aa5cdb4ab67 984 return MICROBIT_SERIAL_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 985
Jonathan Austin 1:8aa5cdb4ab67 986 lockTx();
Jonathan Austin 1:8aa5cdb4ab67 987
Jonathan Austin 1:8aa5cdb4ab67 988 this->txBuffSize = size;
Jonathan Austin 1:8aa5cdb4ab67 989
Jonathan Austin 1:8aa5cdb4ab67 990 int result = initialiseTx();
Jonathan Austin 1:8aa5cdb4ab67 991
Jonathan Austin 1:8aa5cdb4ab67 992 unlockTx();
Jonathan Austin 1:8aa5cdb4ab67 993
Jonathan Austin 1:8aa5cdb4ab67 994 return result;
Jonathan Austin 1:8aa5cdb4ab67 995 }
Jonathan Austin 1:8aa5cdb4ab67 996
Jonathan Austin 1:8aa5cdb4ab67 997 /**
Jonathan Austin 1:8aa5cdb4ab67 998 * The size of our rx buffer in bytes.
Jonathan Austin 1:8aa5cdb4ab67 999 *
Jonathan Austin 1:8aa5cdb4ab67 1000 * @return the current size of rxBuff in bytes
Jonathan Austin 1:8aa5cdb4ab67 1001 */
Jonathan Austin 1:8aa5cdb4ab67 1002 int MicroBitSerial::getRxBufferSize()
Jonathan Austin 1:8aa5cdb4ab67 1003 {
Jonathan Austin 1:8aa5cdb4ab67 1004 return this->rxBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 1005 }
Jonathan Austin 1:8aa5cdb4ab67 1006
Jonathan Austin 1:8aa5cdb4ab67 1007 /**
Jonathan Austin 1:8aa5cdb4ab67 1008 * The size of our tx buffer in bytes.
Jonathan Austin 1:8aa5cdb4ab67 1009 *
Jonathan Austin 1:8aa5cdb4ab67 1010 * @return the current size of txBuff in bytes
Jonathan Austin 1:8aa5cdb4ab67 1011 */
Jonathan Austin 1:8aa5cdb4ab67 1012 int MicroBitSerial::getTxBufferSize()
Jonathan Austin 1:8aa5cdb4ab67 1013 {
Jonathan Austin 1:8aa5cdb4ab67 1014 return this->txBuffSize;
Jonathan Austin 1:8aa5cdb4ab67 1015 }
Jonathan Austin 1:8aa5cdb4ab67 1016
Jonathan Austin 1:8aa5cdb4ab67 1017 /**
Jonathan Austin 1:8aa5cdb4ab67 1018 * Sets the tail to match the head of our circular buffer for reception,
Jonathan Austin 1:8aa5cdb4ab67 1019 * effectively clearing the reception buffer.
Jonathan Austin 1:8aa5cdb4ab67 1020 *
Jonathan Austin 1:8aa5cdb4ab67 1021 * @return MICROBIT_SERIAL_IN_USE if another fiber is currently using this instance
Jonathan Austin 1:8aa5cdb4ab67 1022 * for reception, otherwise MICROBIT_OK.
Jonathan Austin 1:8aa5cdb4ab67 1023 */
Jonathan Austin 1:8aa5cdb4ab67 1024 int MicroBitSerial::clearRxBuffer()
Jonathan Austin 1:8aa5cdb4ab67 1025 {
Jonathan Austin 1:8aa5cdb4ab67 1026 if(rxInUse())
Jonathan Austin 1:8aa5cdb4ab67 1027 return MICROBIT_SERIAL_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 1028
Jonathan Austin 1:8aa5cdb4ab67 1029 lockRx();
Jonathan Austin 1:8aa5cdb4ab67 1030
Jonathan Austin 1:8aa5cdb4ab67 1031 rxBuffTail = rxBuffHead;
Jonathan Austin 1:8aa5cdb4ab67 1032
Jonathan Austin 1:8aa5cdb4ab67 1033 unlockRx();
Jonathan Austin 1:8aa5cdb4ab67 1034
Jonathan Austin 1:8aa5cdb4ab67 1035 return MICROBIT_OK;
Jonathan Austin 1:8aa5cdb4ab67 1036 }
Jonathan Austin 1:8aa5cdb4ab67 1037
Jonathan Austin 1:8aa5cdb4ab67 1038 /**
Jonathan Austin 1:8aa5cdb4ab67 1039 * Sets the tail to match the head of our circular buffer for transmission,
Jonathan Austin 1:8aa5cdb4ab67 1040 * effectively clearing the transmission buffer.
Jonathan Austin 1:8aa5cdb4ab67 1041 *
Jonathan Austin 1:8aa5cdb4ab67 1042 * @return MICROBIT_SERIAL_IN_USE if another fiber is currently using this instance
Jonathan Austin 1:8aa5cdb4ab67 1043 * for transmission, otherwise MICROBIT_OK.
Jonathan Austin 1:8aa5cdb4ab67 1044 */
Jonathan Austin 1:8aa5cdb4ab67 1045 int MicroBitSerial::clearTxBuffer()
Jonathan Austin 1:8aa5cdb4ab67 1046 {
Jonathan Austin 1:8aa5cdb4ab67 1047 if(txInUse())
Jonathan Austin 1:8aa5cdb4ab67 1048 return MICROBIT_SERIAL_IN_USE;
Jonathan Austin 1:8aa5cdb4ab67 1049
Jonathan Austin 1:8aa5cdb4ab67 1050 lockTx();
Jonathan Austin 1:8aa5cdb4ab67 1051
Jonathan Austin 1:8aa5cdb4ab67 1052 txBuffTail = txBuffHead;
Jonathan Austin 1:8aa5cdb4ab67 1053
Jonathan Austin 1:8aa5cdb4ab67 1054 unlockTx();
Jonathan Austin 1:8aa5cdb4ab67 1055
Jonathan Austin 1:8aa5cdb4ab67 1056 return MICROBIT_OK;
Jonathan Austin 1:8aa5cdb4ab67 1057 }
Jonathan Austin 1:8aa5cdb4ab67 1058
Jonathan Austin 1:8aa5cdb4ab67 1059 /**
Jonathan Austin 1:8aa5cdb4ab67 1060 * The number of bytes currently stored in our rx buffer waiting to be digested,
Jonathan Austin 1:8aa5cdb4ab67 1061 * by the user.
Jonathan Austin 1:8aa5cdb4ab67 1062 *
Jonathan Austin 1:8aa5cdb4ab67 1063 * @return The currently buffered number of bytes in our rxBuff.
Jonathan Austin 1:8aa5cdb4ab67 1064 */
Jonathan Austin 1:8aa5cdb4ab67 1065 int MicroBitSerial::rxBufferedSize()
Jonathan Austin 1:8aa5cdb4ab67 1066 {
Jonathan Austin 1:8aa5cdb4ab67 1067 if(rxBuffTail > rxBuffHead)
Jonathan Austin 1:8aa5cdb4ab67 1068 return (rxBuffSize - rxBuffTail) + rxBuffHead;
Jonathan Austin 1:8aa5cdb4ab67 1069
Jonathan Austin 1:8aa5cdb4ab67 1070 return rxBuffHead - rxBuffTail;
Jonathan Austin 1:8aa5cdb4ab67 1071 }
Jonathan Austin 1:8aa5cdb4ab67 1072
Jonathan Austin 1:8aa5cdb4ab67 1073 /**
Jonathan Austin 1:8aa5cdb4ab67 1074 * The number of bytes currently stored in our tx buffer waiting to be transmitted
Jonathan Austin 1:8aa5cdb4ab67 1075 * by the hardware.
Jonathan Austin 1:8aa5cdb4ab67 1076 *
Jonathan Austin 1:8aa5cdb4ab67 1077 * @return The currently buffered number of bytes in our txBuff.
Jonathan Austin 1:8aa5cdb4ab67 1078 */
Jonathan Austin 1:8aa5cdb4ab67 1079 int MicroBitSerial::txBufferedSize()
Jonathan Austin 1:8aa5cdb4ab67 1080 {
Jonathan Austin 1:8aa5cdb4ab67 1081 if(txBuffTail > txBuffHead)
Jonathan Austin 1:8aa5cdb4ab67 1082 return (txBuffSize - txBuffTail) + txBuffHead;
Jonathan Austin 1:8aa5cdb4ab67 1083
Jonathan Austin 1:8aa5cdb4ab67 1084 return txBuffHead - txBuffTail;
Jonathan Austin 1:8aa5cdb4ab67 1085 }
Jonathan Austin 1:8aa5cdb4ab67 1086
Jonathan Austin 1:8aa5cdb4ab67 1087 /**
Jonathan Austin 1:8aa5cdb4ab67 1088 * Determines if the serial bus is currently in use by another fiber for reception.
Jonathan Austin 1:8aa5cdb4ab67 1089 *
Jonathan Austin 1:8aa5cdb4ab67 1090 * @return The state of our mutex lock for reception.
Jonathan Austin 1:8aa5cdb4ab67 1091 *
Jonathan Austin 1:8aa5cdb4ab67 1092 * @note Only one fiber can call read at a time
Jonathan Austin 1:8aa5cdb4ab67 1093 */
Jonathan Austin 1:8aa5cdb4ab67 1094 int MicroBitSerial::rxInUse()
Jonathan Austin 1:8aa5cdb4ab67 1095 {
Jonathan Austin 1:8aa5cdb4ab67 1096 return (status & MICROBIT_SERIAL_RX_IN_USE);
Jonathan Austin 1:8aa5cdb4ab67 1097 }
Jonathan Austin 1:8aa5cdb4ab67 1098
Jonathan Austin 1:8aa5cdb4ab67 1099 /**
Jonathan Austin 1:8aa5cdb4ab67 1100 * Determines if the serial bus is currently in use by another fiber for transmission.
Jonathan Austin 1:8aa5cdb4ab67 1101 *
Jonathan Austin 1:8aa5cdb4ab67 1102 * @return The state of our mutex lock for transmition.
Jonathan Austin 1:8aa5cdb4ab67 1103 *
Jonathan Austin 1:8aa5cdb4ab67 1104 * @note Only one fiber can call send at a time
Jonathan Austin 1:8aa5cdb4ab67 1105 */
Jonathan Austin 1:8aa5cdb4ab67 1106 int MicroBitSerial::txInUse()
Jonathan Austin 1:8aa5cdb4ab67 1107 {
Jonathan Austin 1:8aa5cdb4ab67 1108 return (status & MICROBIT_SERIAL_TX_IN_USE);
Jonathan Austin 1:8aa5cdb4ab67 1109 }
Jonathan Austin 1:8aa5cdb4ab67 1110
Jonathan Austin 1:8aa5cdb4ab67 1111 /**
Jonathan Austin 1:8aa5cdb4ab67 1112 * Detaches a previously configured interrupt
Jonathan Austin 1:8aa5cdb4ab67 1113 *
Jonathan Austin 1:8aa5cdb4ab67 1114 * @param interruptType one of Serial::RxIrq or Serial::TxIrq
Jonathan Austin 1:8aa5cdb4ab67 1115 */
Jonathan Austin 1:8aa5cdb4ab67 1116 void MicroBitSerial::detach(Serial::IrqType interruptType)
Jonathan Austin 1:8aa5cdb4ab67 1117 {
Jonathan Austin 1:8aa5cdb4ab67 1118 //we detach by sending a bad value to attach, for some weird reason...
Jonathan Austin 1:8aa5cdb4ab67 1119 attach((MicroBitSerial *)NULL, &MicroBitSerial::dataReceived, interruptType);
LancasterUniversity 3:d86a4ddc1867 1120 }