Iftikhar Aziz / mbed-dev

4545

Dependents:   LSS_Rev_1

Fork of mbed-dev by Umar Naeem

drivers/SerialBase.cpp@166:33361e55dd8c, 2017-08-23 (annotated)

Committer:
iftaziz
Date:
Wed Aug 23 10:32:38 2017 +0000
Revision:
166:33361e55dd8c
Parent:
160:d5399cc887bb 
r1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2006-2013 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #include "drivers/SerialBase.h"
<> 160:d5399cc887bb 17 #include "platform/mbed_wait_api.h"
<> 160:d5399cc887bb 18 #include "platform/mbed_critical.h"
<> 149:156823d33999 19
<> 149:156823d33999 20 #if DEVICE_SERIAL
<> 149:156823d33999 21
<> 149:156823d33999 22 namespace mbed {
<> 149:156823d33999 23
<> 149:156823d33999 24 static void donothing() {};
<> 149:156823d33999 25
<> 149:156823d33999 26 SerialBase::SerialBase(PinName tx, PinName rx, int baud) :
<> 149:156823d33999 27 #if DEVICE_SERIAL_ASYNCH
<> 149:156823d33999 28 _thunk_irq(this), _tx_usage(DMA_USAGE_NEVER),
<> 149:156823d33999 29 _rx_usage(DMA_USAGE_NEVER),
<> 149:156823d33999 30 #endif
<> 149:156823d33999 31 _serial(), _baud(baud) {
<> 149:156823d33999 32 // No lock needed in the constructor
<> 149:156823d33999 33
<> 149:156823d33999 34 for (size_t i = 0; i < sizeof _irq / sizeof _irq[0]; i++) {
<> 160:d5399cc887bb 35 _irq[i] = donothing;
<> 149:156823d33999 36 }
<> 149:156823d33999 37
<> 149:156823d33999 38 serial_init(&_serial, tx, rx);
<> 149:156823d33999 39 serial_baud(&_serial, _baud);
<> 149:156823d33999 40 serial_irq_handler(&_serial, SerialBase::_irq_handler, (uint32_t)this);
<> 149:156823d33999 41 }
<> 149:156823d33999 42
<> 149:156823d33999 43 void SerialBase::baud(int baudrate) {
<> 149:156823d33999 44 lock();
<> 149:156823d33999 45 serial_baud(&_serial, baudrate);
<> 149:156823d33999 46 _baud = baudrate;
<> 149:156823d33999 47 unlock();
<> 149:156823d33999 48 }
<> 149:156823d33999 49
<> 149:156823d33999 50 void SerialBase::format(int bits, Parity parity, int stop_bits) {
<> 149:156823d33999 51 lock();
<> 149:156823d33999 52 serial_format(&_serial, bits, (SerialParity)parity, stop_bits);
<> 149:156823d33999 53 unlock();
<> 149:156823d33999 54 }
<> 149:156823d33999 55
<> 149:156823d33999 56 int SerialBase::readable() {
<> 149:156823d33999 57 lock();
<> 149:156823d33999 58 int ret = serial_readable(&_serial);
<> 149:156823d33999 59 unlock();
<> 149:156823d33999 60 return ret;
<> 149:156823d33999 61 }
<> 149:156823d33999 62
<> 149:156823d33999 63
<> 149:156823d33999 64 int SerialBase::writeable() {
<> 149:156823d33999 65 lock();
<> 149:156823d33999 66 int ret = serial_writable(&_serial);
<> 149:156823d33999 67 unlock();
<> 149:156823d33999 68 return ret;
<> 149:156823d33999 69 }
<> 149:156823d33999 70
<> 149:156823d33999 71 void SerialBase::attach(Callback<void()> func, IrqType type) {
<> 149:156823d33999 72 lock();
<> 149:156823d33999 73 // Disable interrupts when attaching interrupt handler
<> 149:156823d33999 74 core_util_critical_section_enter();
<> 149:156823d33999 75 if (func) {
<> 160:d5399cc887bb 76 _irq[type] = func;
<> 149:156823d33999 77 serial_irq_set(&_serial, (SerialIrq)type, 1);
<> 149:156823d33999 78 } else {
<> 160:d5399cc887bb 79 _irq[type] = donothing;
<> 149:156823d33999 80 serial_irq_set(&_serial, (SerialIrq)type, 0);
<> 149:156823d33999 81 }
<> 149:156823d33999 82 core_util_critical_section_exit();
<> 149:156823d33999 83 unlock();
<> 149:156823d33999 84 }
<> 149:156823d33999 85
<> 149:156823d33999 86 void SerialBase::_irq_handler(uint32_t id, SerialIrq irq_type) {
<> 149:156823d33999 87 SerialBase *handler = (SerialBase*)id;
<> 160:d5399cc887bb 88 handler->_irq[irq_type]();
<> 149:156823d33999 89 }
<> 149:156823d33999 90
<> 149:156823d33999 91 int SerialBase::_base_getc() {
<> 149:156823d33999 92 // Mutex is already held
<> 149:156823d33999 93 return serial_getc(&_serial);
<> 149:156823d33999 94 }
<> 149:156823d33999 95
<> 149:156823d33999 96 int SerialBase::_base_putc(int c) {
<> 149:156823d33999 97 // Mutex is already held
<> 149:156823d33999 98 serial_putc(&_serial, c);
<> 149:156823d33999 99 return c;
<> 149:156823d33999 100 }
<> 149:156823d33999 101
<> 149:156823d33999 102 void SerialBase::send_break() {
<> 149:156823d33999 103 lock();
<> 149:156823d33999 104 // Wait for 1.5 frames before clearing the break condition
<> 149:156823d33999 105 // This will have different effects on our platforms, but should
<> 149:156823d33999 106 // ensure that we keep the break active for at least one frame.
<> 149:156823d33999 107 // We consider a full frame (1 start bit + 8 data bits bits +
<> 149:156823d33999 108 // 1 parity bit + 2 stop bits = 12 bits) for computation.
<> 149:156823d33999 109 // One bit time (in us) = 1000000/_baud
<> 149:156823d33999 110 // Twelve bits: 12000000/baud delay
<> 149:156823d33999 111 // 1.5 frames: 18000000/baud delay
<> 149:156823d33999 112 serial_break_set(&_serial);
<> 149:156823d33999 113 wait_us(18000000/_baud);
<> 149:156823d33999 114 serial_break_clear(&_serial);
<> 149:156823d33999 115 unlock();
<> 149:156823d33999 116 }
<> 149:156823d33999 117
<> 149:156823d33999 118 void SerialBase::lock() {
<> 149:156823d33999 119 // Stub
<> 149:156823d33999 120 }
<> 149:156823d33999 121
<> 149:156823d33999 122 void SerialBase:: unlock() {
<> 149:156823d33999 123 // Stub
<> 149:156823d33999 124 }
<> 149:156823d33999 125
<> 149:156823d33999 126 #if DEVICE_SERIAL_FC
<> 149:156823d33999 127 void SerialBase::set_flow_control(Flow type, PinName flow1, PinName flow2) {
<> 149:156823d33999 128 lock();
<> 149:156823d33999 129 FlowControl flow_type = (FlowControl)type;
<> 149:156823d33999 130 switch(type) {
<> 149:156823d33999 131 case RTS:
<> 149:156823d33999 132 serial_set_flow_control(&_serial, flow_type, flow1, NC);
<> 149:156823d33999 133 break;
<> 149:156823d33999 134
<> 149:156823d33999 135 case CTS:
<> 149:156823d33999 136 serial_set_flow_control(&_serial, flow_type, NC, flow1);
<> 149:156823d33999 137 break;
<> 149:156823d33999 138
<> 149:156823d33999 139 case RTSCTS:
<> 149:156823d33999 140 case Disabled:
<> 149:156823d33999 141 serial_set_flow_control(&_serial, flow_type, flow1, flow2);
<> 149:156823d33999 142 break;
<> 149:156823d33999 143
<> 149:156823d33999 144 default:
<> 149:156823d33999 145 break;
<> 149:156823d33999 146 }
<> 149:156823d33999 147 unlock();
<> 149:156823d33999 148 }
<> 149:156823d33999 149 #endif
<> 149:156823d33999 150
<> 149:156823d33999 151 #if DEVICE_SERIAL_ASYNCH
<> 149:156823d33999 152
<> 149:156823d33999 153 int SerialBase::write(const uint8_t *buffer, int length, const event_callback_t& callback, int event)
<> 149:156823d33999 154 {
<> 149:156823d33999 155 if (serial_tx_active(&_serial)) {
<> 149:156823d33999 156 return -1; // transaction ongoing
<> 149:156823d33999 157 }
<> 149:156823d33999 158 start_write((void *)buffer, length, 8, callback, event);
<> 149:156823d33999 159 return 0;
<> 149:156823d33999 160 }
<> 149:156823d33999 161
<> 149:156823d33999 162 int SerialBase::write(const uint16_t *buffer, int length, const event_callback_t& callback, int event)
<> 149:156823d33999 163 {
<> 149:156823d33999 164 if (serial_tx_active(&_serial)) {
<> 149:156823d33999 165 return -1; // transaction ongoing
<> 149:156823d33999 166 }
<> 149:156823d33999 167 start_write((void *)buffer, length, 16, callback, event);
<> 149:156823d33999 168 return 0;
<> 149:156823d33999 169 }
<> 149:156823d33999 170
<> 149:156823d33999 171 void SerialBase::start_write(const void *buffer, int buffer_size, char buffer_width, const event_callback_t& callback, int event)
<> 149:156823d33999 172 {
<> 149:156823d33999 173 _tx_callback = callback;
<> 149:156823d33999 174
<> 149:156823d33999 175 _thunk_irq.callback(&SerialBase::interrupt_handler_asynch);
<> 149:156823d33999 176 serial_tx_asynch(&_serial, buffer, buffer_size, buffer_width, _thunk_irq.entry(), event, _tx_usage);
<> 149:156823d33999 177 }
<> 149:156823d33999 178
<> 149:156823d33999 179 void SerialBase::abort_write(void)
<> 149:156823d33999 180 {
<> 149:156823d33999 181 serial_tx_abort_asynch(&_serial);
<> 149:156823d33999 182 }
<> 149:156823d33999 183
<> 149:156823d33999 184 void SerialBase::abort_read(void)
<> 149:156823d33999 185 {
<> 149:156823d33999 186 serial_rx_abort_asynch(&_serial);
<> 149:156823d33999 187 }
<> 149:156823d33999 188
<> 149:156823d33999 189 int SerialBase::set_dma_usage_tx(DMAUsage usage)
<> 149:156823d33999 190 {
<> 149:156823d33999 191 if (serial_tx_active(&_serial)) {
<> 149:156823d33999 192 return -1;
<> 149:156823d33999 193 }
<> 149:156823d33999 194 _tx_usage = usage;
<> 149:156823d33999 195 return 0;
<> 149:156823d33999 196 }
<> 149:156823d33999 197
<> 149:156823d33999 198 int SerialBase::set_dma_usage_rx(DMAUsage usage)
<> 149:156823d33999 199 {
<> 149:156823d33999 200 if (serial_tx_active(&_serial)) {
<> 149:156823d33999 201 return -1;
<> 149:156823d33999 202 }
<> 149:156823d33999 203 _rx_usage = usage;
<> 149:156823d33999 204 return 0;
<> 149:156823d33999 205 }
<> 149:156823d33999 206
<> 149:156823d33999 207 int SerialBase::read(uint8_t *buffer, int length, const event_callback_t& callback, int event, unsigned char char_match)
<> 149:156823d33999 208 {
<> 149:156823d33999 209 if (serial_rx_active(&_serial)) {
<> 149:156823d33999 210 return -1; // transaction ongoing
<> 149:156823d33999 211 }
<> 149:156823d33999 212 start_read((void*)buffer, length, 8, callback, event, char_match);
<> 149:156823d33999 213 return 0;
<> 149:156823d33999 214 }
<> 149:156823d33999 215
<> 149:156823d33999 216
<> 149:156823d33999 217 int SerialBase::read(uint16_t *buffer, int length, const event_callback_t& callback, int event, unsigned char char_match)
<> 149:156823d33999 218 {
<> 149:156823d33999 219 if (serial_rx_active(&_serial)) {
<> 149:156823d33999 220 return -1; // transaction ongoing
<> 149:156823d33999 221 }
<> 149:156823d33999 222 start_read((void*)buffer, length, 16, callback, event, char_match);
<> 149:156823d33999 223 return 0;
<> 149:156823d33999 224 }
<> 149:156823d33999 225
<> 149:156823d33999 226
<> 149:156823d33999 227 void SerialBase::start_read(void *buffer, int buffer_size, char buffer_width, const event_callback_t& callback, int event, unsigned char char_match)
<> 149:156823d33999 228 {
<> 149:156823d33999 229 _rx_callback = callback;
<> 149:156823d33999 230 _thunk_irq.callback(&SerialBase::interrupt_handler_asynch);
<> 149:156823d33999 231 serial_rx_asynch(&_serial, buffer, buffer_size, buffer_width, _thunk_irq.entry(), event, char_match, _rx_usage);
<> 149:156823d33999 232 }
<> 149:156823d33999 233
<> 149:156823d33999 234 void SerialBase::interrupt_handler_asynch(void)
<> 149:156823d33999 235 {
<> 149:156823d33999 236 int event = serial_irq_handler_asynch(&_serial);
<> 149:156823d33999 237 int rx_event = event & SERIAL_EVENT_RX_MASK;
<> 149:156823d33999 238 if (_rx_callback && rx_event) {
<> 149:156823d33999 239 _rx_callback.call(rx_event);
<> 149:156823d33999 240 }
<> 149:156823d33999 241
<> 149:156823d33999 242 int tx_event = event & SERIAL_EVENT_TX_MASK;
<> 149:156823d33999 243 if (_tx_callback && tx_event) {
<> 149:156823d33999 244 _tx_callback.call(tx_event);
<> 149:156823d33999 245 }
<> 149:156823d33999 246 }
<> 149:156823d33999 247
<> 149:156823d33999 248 #endif
<> 149:156823d33999 249
<> 149:156823d33999 250 } // namespace mbed
<> 149:156823d33999 251
<> 149:156823d33999 252 #endif