Amit Gandhi / mbed-dev

test

Fork of mbed-dev by mbed official

drivers/UARTSerial.cpp@171:19eb464bc2be, 2017-08-03 (annotated)

Committer:
Kojto
Date:
Thu Aug 03 13:13:39 2017 +0100
Revision:
171:19eb464bc2be
Parent:
169:9672193075cf
Child:
177:447f873cad2f
This updates the lib to the mbed lib v 148

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 168:e84263d55307 1 /* mbed Microcontroller Library
AnnaBridge 168:e84263d55307 2 * Copyright (c) 2006-2017 ARM Limited
AnnaBridge 168:e84263d55307 3 *
AnnaBridge 168:e84263d55307 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 168:e84263d55307 5 * you may not use this file except in compliance with the License.
AnnaBridge 168:e84263d55307 6 * You may obtain a copy of the License at
AnnaBridge 168:e84263d55307 7 *
AnnaBridge 168:e84263d55307 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 168:e84263d55307 9 *
AnnaBridge 168:e84263d55307 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 168:e84263d55307 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 168:e84263d55307 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 168:e84263d55307 13 * See the License for the specific language governing permissions and
AnnaBridge 168:e84263d55307 14 * limitations under the License.
AnnaBridge 168:e84263d55307 15 */
AnnaBridge 168:e84263d55307 16
AnnaBridge 169:9672193075cf 17 #if (DEVICE_SERIAL && DEVICE_INTERRUPTIN)
AnnaBridge 168:e84263d55307 18
AnnaBridge 168:e84263d55307 19 #include <errno.h>
AnnaBridge 168:e84263d55307 20 #include "UARTSerial.h"
AnnaBridge 168:e84263d55307 21 #include "platform/mbed_poll.h"
AnnaBridge 168:e84263d55307 22 #include "platform/mbed_wait_api.h"
AnnaBridge 168:e84263d55307 23
AnnaBridge 168:e84263d55307 24 namespace mbed {
AnnaBridge 168:e84263d55307 25
AnnaBridge 168:e84263d55307 26 UARTSerial::UARTSerial(PinName tx, PinName rx, int baud) :
AnnaBridge 168:e84263d55307 27 SerialBase(tx, rx, baud),
AnnaBridge 168:e84263d55307 28 _blocking(true),
AnnaBridge 168:e84263d55307 29 _tx_irq_enabled(false),
AnnaBridge 168:e84263d55307 30 _dcd_irq(NULL)
AnnaBridge 168:e84263d55307 31 {
AnnaBridge 168:e84263d55307 32 /* Attatch IRQ routines to the serial device. */
AnnaBridge 168:e84263d55307 33 SerialBase::attach(callback(this, &UARTSerial::rx_irq), RxIrq);
AnnaBridge 168:e84263d55307 34 }
AnnaBridge 168:e84263d55307 35
AnnaBridge 168:e84263d55307 36 UARTSerial::~UARTSerial()
AnnaBridge 168:e84263d55307 37 {
AnnaBridge 168:e84263d55307 38 delete _dcd_irq;
AnnaBridge 168:e84263d55307 39 }
AnnaBridge 168:e84263d55307 40
AnnaBridge 168:e84263d55307 41 void UARTSerial::dcd_irq()
AnnaBridge 168:e84263d55307 42 {
AnnaBridge 168:e84263d55307 43 wake();
AnnaBridge 168:e84263d55307 44 }
AnnaBridge 168:e84263d55307 45
Kojto 171:19eb464bc2be 46 void UARTSerial::set_baud(int baud)
Kojto 171:19eb464bc2be 47 {
Kojto 171:19eb464bc2be 48 SerialBase::baud(baud);
Kojto 171:19eb464bc2be 49 }
Kojto 171:19eb464bc2be 50
AnnaBridge 168:e84263d55307 51 void UARTSerial::set_data_carrier_detect(PinName dcd_pin, bool active_high)
AnnaBridge 168:e84263d55307 52 {
AnnaBridge 168:e84263d55307 53 delete _dcd_irq;
AnnaBridge 168:e84263d55307 54 _dcd_irq = NULL;
AnnaBridge 168:e84263d55307 55
AnnaBridge 168:e84263d55307 56 if (dcd_pin != NC) {
AnnaBridge 168:e84263d55307 57 _dcd_irq = new InterruptIn(dcd_pin);
AnnaBridge 168:e84263d55307 58 if (active_high) {
AnnaBridge 168:e84263d55307 59 _dcd_irq->fall(callback(this, &UARTSerial::dcd_irq));
AnnaBridge 168:e84263d55307 60 } else {
AnnaBridge 168:e84263d55307 61 _dcd_irq->rise(callback(this, &UARTSerial::dcd_irq));
AnnaBridge 168:e84263d55307 62 }
AnnaBridge 168:e84263d55307 63 }
AnnaBridge 168:e84263d55307 64 }
AnnaBridge 168:e84263d55307 65
AnnaBridge 168:e84263d55307 66 int UARTSerial::close()
AnnaBridge 168:e84263d55307 67 {
AnnaBridge 168:e84263d55307 68 /* Does not let us pass a file descriptor. So how to close ?
AnnaBridge 168:e84263d55307 69 * Also, does it make sense to close a device type file descriptor*/
AnnaBridge 168:e84263d55307 70 return 0;
AnnaBridge 168:e84263d55307 71 }
AnnaBridge 168:e84263d55307 72
AnnaBridge 168:e84263d55307 73 int UARTSerial::isatty()
AnnaBridge 168:e84263d55307 74 {
AnnaBridge 168:e84263d55307 75 return 1;
AnnaBridge 168:e84263d55307 76
AnnaBridge 168:e84263d55307 77 }
AnnaBridge 168:e84263d55307 78
AnnaBridge 168:e84263d55307 79 off_t UARTSerial::seek(off_t offset, int whence)
AnnaBridge 168:e84263d55307 80 {
AnnaBridge 168:e84263d55307 81 /*XXX lseek can be done theoratically, but is it sane to mark positions on a dynamically growing/shrinking
AnnaBridge 168:e84263d55307 82 * buffer system (from an interrupt context) */
AnnaBridge 168:e84263d55307 83 return -ESPIPE;
AnnaBridge 168:e84263d55307 84 }
AnnaBridge 168:e84263d55307 85
AnnaBridge 168:e84263d55307 86 int UARTSerial::sync()
AnnaBridge 168:e84263d55307 87 {
AnnaBridge 169:9672193075cf 88 api_lock();
AnnaBridge 168:e84263d55307 89
AnnaBridge 168:e84263d55307 90 while (!_txbuf.empty()) {
AnnaBridge 169:9672193075cf 91 api_unlock();
AnnaBridge 168:e84263d55307 92 // Doing better than wait would require TxIRQ to also do wake() when becoming empty. Worth it?
AnnaBridge 168:e84263d55307 93 wait_ms(1);
AnnaBridge 169:9672193075cf 94 api_lock();
AnnaBridge 168:e84263d55307 95 }
AnnaBridge 168:e84263d55307 96
AnnaBridge 169:9672193075cf 97 api_unlock();
AnnaBridge 168:e84263d55307 98
AnnaBridge 168:e84263d55307 99 return 0;
AnnaBridge 168:e84263d55307 100 }
AnnaBridge 168:e84263d55307 101
AnnaBridge 168:e84263d55307 102 void UARTSerial::sigio(Callback<void()> func) {
AnnaBridge 168:e84263d55307 103 core_util_critical_section_enter();
AnnaBridge 168:e84263d55307 104 _sigio_cb = func;
AnnaBridge 168:e84263d55307 105 if (_sigio_cb) {
AnnaBridge 168:e84263d55307 106 short current_events = poll(0x7FFF);
AnnaBridge 168:e84263d55307 107 if (current_events) {
AnnaBridge 168:e84263d55307 108 _sigio_cb();
AnnaBridge 168:e84263d55307 109 }
AnnaBridge 168:e84263d55307 110 }
AnnaBridge 168:e84263d55307 111 core_util_critical_section_exit();
AnnaBridge 168:e84263d55307 112 }
AnnaBridge 168:e84263d55307 113
AnnaBridge 168:e84263d55307 114 ssize_t UARTSerial::write(const void* buffer, size_t length)
AnnaBridge 168:e84263d55307 115 {
AnnaBridge 168:e84263d55307 116 size_t data_written = 0;
AnnaBridge 168:e84263d55307 117 const char *buf_ptr = static_cast<const char *>(buffer);
AnnaBridge 168:e84263d55307 118
AnnaBridge 169:9672193075cf 119 api_lock();
AnnaBridge 168:e84263d55307 120
AnnaBridge 168:e84263d55307 121 while (_txbuf.full()) {
AnnaBridge 168:e84263d55307 122 if (!_blocking) {
AnnaBridge 169:9672193075cf 123 api_unlock();
AnnaBridge 168:e84263d55307 124 return -EAGAIN;
AnnaBridge 168:e84263d55307 125 }
AnnaBridge 169:9672193075cf 126 api_unlock();
AnnaBridge 168:e84263d55307 127 wait_ms(1); // XXX todo - proper wait, WFE for non-rtos ?
AnnaBridge 169:9672193075cf 128 api_lock();
AnnaBridge 168:e84263d55307 129 }
AnnaBridge 168:e84263d55307 130
AnnaBridge 168:e84263d55307 131 while (data_written < length && !_txbuf.full()) {
AnnaBridge 168:e84263d55307 132 _txbuf.push(*buf_ptr++);
AnnaBridge 168:e84263d55307 133 data_written++;
AnnaBridge 168:e84263d55307 134 }
AnnaBridge 168:e84263d55307 135
AnnaBridge 168:e84263d55307 136 core_util_critical_section_enter();
AnnaBridge 168:e84263d55307 137 if (!_tx_irq_enabled) {
AnnaBridge 168:e84263d55307 138 UARTSerial::tx_irq(); // only write to hardware in one place
AnnaBridge 168:e84263d55307 139 if (!_txbuf.empty()) {
AnnaBridge 168:e84263d55307 140 SerialBase::attach(callback(this, &UARTSerial::tx_irq), TxIrq);
AnnaBridge 168:e84263d55307 141 _tx_irq_enabled = true;
AnnaBridge 168:e84263d55307 142 }
AnnaBridge 168:e84263d55307 143 }
AnnaBridge 168:e84263d55307 144 core_util_critical_section_exit();
AnnaBridge 168:e84263d55307 145
AnnaBridge 169:9672193075cf 146 api_unlock();
AnnaBridge 168:e84263d55307 147
AnnaBridge 168:e84263d55307 148 return data_written;
AnnaBridge 168:e84263d55307 149 }
AnnaBridge 168:e84263d55307 150
AnnaBridge 168:e84263d55307 151 ssize_t UARTSerial::read(void* buffer, size_t length)
AnnaBridge 168:e84263d55307 152 {
AnnaBridge 168:e84263d55307 153 size_t data_read = 0;
AnnaBridge 168:e84263d55307 154
AnnaBridge 168:e84263d55307 155 char *ptr = static_cast<char *>(buffer);
AnnaBridge 168:e84263d55307 156
AnnaBridge 169:9672193075cf 157 api_lock();
AnnaBridge 168:e84263d55307 158
AnnaBridge 168:e84263d55307 159 while (_rxbuf.empty()) {
AnnaBridge 168:e84263d55307 160 if (!_blocking) {
AnnaBridge 169:9672193075cf 161 api_unlock();
AnnaBridge 168:e84263d55307 162 return -EAGAIN;
AnnaBridge 168:e84263d55307 163 }
AnnaBridge 169:9672193075cf 164 api_unlock();
AnnaBridge 168:e84263d55307 165 wait_ms(1); // XXX todo - proper wait, WFE for non-rtos ?
AnnaBridge 169:9672193075cf 166 api_lock();
AnnaBridge 168:e84263d55307 167 }
AnnaBridge 168:e84263d55307 168
AnnaBridge 168:e84263d55307 169 while (data_read < length && !_rxbuf.empty()) {
AnnaBridge 168:e84263d55307 170 _rxbuf.pop(*ptr++);
AnnaBridge 168:e84263d55307 171 data_read++;
AnnaBridge 168:e84263d55307 172 }
AnnaBridge 168:e84263d55307 173
AnnaBridge 169:9672193075cf 174 api_unlock();
AnnaBridge 168:e84263d55307 175
AnnaBridge 168:e84263d55307 176 return data_read;
AnnaBridge 168:e84263d55307 177 }
AnnaBridge 168:e84263d55307 178
AnnaBridge 168:e84263d55307 179 bool UARTSerial::hup() const
AnnaBridge 168:e84263d55307 180 {
AnnaBridge 168:e84263d55307 181 return _dcd_irq && _dcd_irq->read() != 0;
AnnaBridge 168:e84263d55307 182 }
AnnaBridge 168:e84263d55307 183
AnnaBridge 168:e84263d55307 184 void UARTSerial::wake()
AnnaBridge 168:e84263d55307 185 {
AnnaBridge 168:e84263d55307 186 if (_sigio_cb) {
AnnaBridge 168:e84263d55307 187 _sigio_cb();
AnnaBridge 168:e84263d55307 188 }
AnnaBridge 168:e84263d55307 189 }
AnnaBridge 168:e84263d55307 190
AnnaBridge 168:e84263d55307 191 short UARTSerial::poll(short events) const {
AnnaBridge 168:e84263d55307 192
AnnaBridge 168:e84263d55307 193 short revents = 0;
AnnaBridge 168:e84263d55307 194 /* Check the Circular Buffer if space available for writing out */
AnnaBridge 168:e84263d55307 195
AnnaBridge 168:e84263d55307 196
AnnaBridge 168:e84263d55307 197 if (!_rxbuf.empty()) {
AnnaBridge 168:e84263d55307 198 revents |= POLLIN;
AnnaBridge 168:e84263d55307 199 }
AnnaBridge 168:e84263d55307 200
AnnaBridge 168:e84263d55307 201 /* POLLHUP and POLLOUT are mutually exclusive */
AnnaBridge 168:e84263d55307 202 if (hup()) {
AnnaBridge 168:e84263d55307 203 revents |= POLLHUP;
AnnaBridge 168:e84263d55307 204 } else if (!_txbuf.full()) {
AnnaBridge 168:e84263d55307 205 revents |= POLLOUT;
AnnaBridge 168:e84263d55307 206 }
AnnaBridge 168:e84263d55307 207
AnnaBridge 168:e84263d55307 208 /*TODO Handle other event types */
AnnaBridge 168:e84263d55307 209
AnnaBridge 168:e84263d55307 210 return revents;
AnnaBridge 168:e84263d55307 211 }
AnnaBridge 168:e84263d55307 212
AnnaBridge 169:9672193075cf 213 void UARTSerial::lock()
AnnaBridge 169:9672193075cf 214 {
AnnaBridge 169:9672193075cf 215 // This is the override for SerialBase.
AnnaBridge 169:9672193075cf 216 // No lock required as we only use SerialBase from interrupt or from
AnnaBridge 169:9672193075cf 217 // inside our own critical section.
AnnaBridge 169:9672193075cf 218 }
AnnaBridge 169:9672193075cf 219
AnnaBridge 169:9672193075cf 220 void UARTSerial::unlock()
AnnaBridge 169:9672193075cf 221 {
AnnaBridge 169:9672193075cf 222 // This is the override for SerialBase.
AnnaBridge 169:9672193075cf 223 }
AnnaBridge 169:9672193075cf 224
AnnaBridge 169:9672193075cf 225 void UARTSerial::api_lock(void)
AnnaBridge 168:e84263d55307 226 {
AnnaBridge 168:e84263d55307 227 _mutex.lock();
AnnaBridge 168:e84263d55307 228 }
AnnaBridge 168:e84263d55307 229
AnnaBridge 169:9672193075cf 230 void UARTSerial::api_unlock(void)
AnnaBridge 168:e84263d55307 231 {
AnnaBridge 168:e84263d55307 232 _mutex.unlock();
AnnaBridge 168:e84263d55307 233 }
AnnaBridge 168:e84263d55307 234
AnnaBridge 168:e84263d55307 235 void UARTSerial::rx_irq(void)
AnnaBridge 168:e84263d55307 236 {
AnnaBridge 168:e84263d55307 237 bool was_empty = _rxbuf.empty();
AnnaBridge 168:e84263d55307 238
AnnaBridge 168:e84263d55307 239 /* Fill in the receive buffer if the peripheral is readable
AnnaBridge 168:e84263d55307 240 * and receive buffer is not full. */
AnnaBridge 168:e84263d55307 241 while (SerialBase::readable()) {
AnnaBridge 168:e84263d55307 242 char data = SerialBase::_base_getc();
AnnaBridge 168:e84263d55307 243 if (!_rxbuf.full()) {
AnnaBridge 168:e84263d55307 244 _rxbuf.push(data);
AnnaBridge 168:e84263d55307 245 } else {
AnnaBridge 168:e84263d55307 246 /* Drop - can we report in some way? */
AnnaBridge 168:e84263d55307 247 }
AnnaBridge 168:e84263d55307 248 }
AnnaBridge 168:e84263d55307 249
AnnaBridge 168:e84263d55307 250 /* Report the File handler that data is ready to be read from the buffer. */
AnnaBridge 168:e84263d55307 251 if (was_empty && !_rxbuf.empty()) {
AnnaBridge 168:e84263d55307 252 wake();
AnnaBridge 168:e84263d55307 253 }
AnnaBridge 168:e84263d55307 254 }
AnnaBridge 168:e84263d55307 255
AnnaBridge 168:e84263d55307 256 // Also called from write to start transfer
AnnaBridge 168:e84263d55307 257 void UARTSerial::tx_irq(void)
AnnaBridge 168:e84263d55307 258 {
AnnaBridge 168:e84263d55307 259 bool was_full = _txbuf.full();
AnnaBridge 168:e84263d55307 260
AnnaBridge 168:e84263d55307 261 /* Write to the peripheral if there is something to write
AnnaBridge 168:e84263d55307 262 * and if the peripheral is available to write. */
AnnaBridge 168:e84263d55307 263 while (!_txbuf.empty() && SerialBase::writeable()) {
AnnaBridge 168:e84263d55307 264 char data;
AnnaBridge 168:e84263d55307 265 _txbuf.pop(data);
AnnaBridge 168:e84263d55307 266 SerialBase::_base_putc(data);
AnnaBridge 168:e84263d55307 267 }
AnnaBridge 168:e84263d55307 268
AnnaBridge 168:e84263d55307 269 if (_tx_irq_enabled && _txbuf.empty()) {
AnnaBridge 168:e84263d55307 270 SerialBase::attach(NULL, TxIrq);
AnnaBridge 168:e84263d55307 271 _tx_irq_enabled = false;
AnnaBridge 168:e84263d55307 272 }
AnnaBridge 168:e84263d55307 273
AnnaBridge 168:e84263d55307 274 /* Report the File handler that data can be written to peripheral. */
AnnaBridge 168:e84263d55307 275 if (was_full && !_txbuf.full() && !hup()) {
AnnaBridge 168:e84263d55307 276 wake();
AnnaBridge 168:e84263d55307 277 }
AnnaBridge 168:e84263d55307 278 }
AnnaBridge 168:e84263d55307 279
AnnaBridge 168:e84263d55307 280 } //namespace mbed
AnnaBridge 168:e84263d55307 281
AnnaBridge 169:9672193075cf 282 #endif //(DEVICE_SERIAL && DEVICE_INTERRUPTIN)