mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
drivers/SPI.cpp@188:bcfe06ba3d64, 2018-11-08 (annotated)
- Committer:
- AnnaBridge
- Date:
- Thu Nov 08 11:46:34 2018 +0000
- Revision:
- 188:bcfe06ba3d64
- Parent:
- 187:0387e8f68319
- Child:
- 189:f392fc9709a3
mbed-dev library. Release version 164
Who changed what in which revision?
User | Revision | Line number | New 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/SPI.h" |
<> | 160:d5399cc887bb | 17 | #include "platform/mbed_critical.h" |
<> | 149:156823d33999 | 18 | |
AnnaBridge | 174:b96e65c34a4d | 19 | #if DEVICE_SPI_ASYNCH |
AnnaBridge | 184:08ed48f1de7f | 20 | #include "platform/mbed_power_mgmt.h" |
AnnaBridge | 174:b96e65c34a4d | 21 | #endif |
AnnaBridge | 174:b96e65c34a4d | 22 | |
<> | 149:156823d33999 | 23 | #if DEVICE_SPI |
<> | 149:156823d33999 | 24 | |
<> | 149:156823d33999 | 25 | namespace mbed { |
<> | 149:156823d33999 | 26 | |
<> | 149:156823d33999 | 27 | #if DEVICE_SPI_ASYNCH && TRANSACTION_QUEUE_SIZE_SPI |
<> | 149:156823d33999 | 28 | CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> SPI::_transaction_buffer; |
<> | 149:156823d33999 | 29 | #endif |
<> | 149:156823d33999 | 30 | |
<> | 149:156823d33999 | 31 | SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName ssel) : |
AnnaBridge | 187:0387e8f68319 | 32 | _spi(), |
<> | 149:156823d33999 | 33 | #if DEVICE_SPI_ASYNCH |
AnnaBridge | 187:0387e8f68319 | 34 | _irq(this), |
AnnaBridge | 187:0387e8f68319 | 35 | _usage(DMA_USAGE_NEVER), |
AnnaBridge | 187:0387e8f68319 | 36 | _deep_sleep_locked(false), |
<> | 149:156823d33999 | 37 | #endif |
AnnaBridge | 187:0387e8f68319 | 38 | _bits(8), |
AnnaBridge | 187:0387e8f68319 | 39 | _mode(0), |
AnnaBridge | 187:0387e8f68319 | 40 | _hz(1000000), |
AnnaBridge | 187:0387e8f68319 | 41 | _write_fill(SPI_FILL_CHAR) |
AnnaBridge | 187:0387e8f68319 | 42 | { |
<> | 149:156823d33999 | 43 | // No lock needed in the constructor |
AnnaBridge | 188:bcfe06ba3d64 | 44 | spi_init(&_spi, mosi, miso, sclk, ssel); |
AnnaBridge | 188:bcfe06ba3d64 | 45 | } |
<> | 149:156823d33999 | 46 | |
AnnaBridge | 188:bcfe06ba3d64 | 47 | SPI::~SPI() |
AnnaBridge | 188:bcfe06ba3d64 | 48 | { |
AnnaBridge | 188:bcfe06ba3d64 | 49 | if (_owner == this) { |
AnnaBridge | 188:bcfe06ba3d64 | 50 | _owner = NULL; |
AnnaBridge | 188:bcfe06ba3d64 | 51 | } |
<> | 149:156823d33999 | 52 | } |
<> | 149:156823d33999 | 53 | |
AnnaBridge | 187:0387e8f68319 | 54 | void SPI::format(int bits, int mode) |
AnnaBridge | 187:0387e8f68319 | 55 | { |
<> | 149:156823d33999 | 56 | lock(); |
<> | 149:156823d33999 | 57 | _bits = bits; |
<> | 149:156823d33999 | 58 | _mode = mode; |
AnnaBridge | 184:08ed48f1de7f | 59 | // If changing format while you are the owner then just |
AnnaBridge | 184:08ed48f1de7f | 60 | // update format, but if owner is changed then even frequency should be |
Kojto | 169:e3b6fe271b81 | 61 | // updated which is done by acquire. |
Kojto | 169:e3b6fe271b81 | 62 | if (_owner == this) { |
Kojto | 169:e3b6fe271b81 | 63 | spi_format(&_spi, _bits, _mode, 0); |
Kojto | 169:e3b6fe271b81 | 64 | } else { |
Kojto | 169:e3b6fe271b81 | 65 | _acquire(); |
Kojto | 169:e3b6fe271b81 | 66 | } |
<> | 149:156823d33999 | 67 | unlock(); |
<> | 149:156823d33999 | 68 | } |
<> | 149:156823d33999 | 69 | |
AnnaBridge | 187:0387e8f68319 | 70 | void SPI::frequency(int hz) |
AnnaBridge | 187:0387e8f68319 | 71 | { |
<> | 149:156823d33999 | 72 | lock(); |
<> | 149:156823d33999 | 73 | _hz = hz; |
AnnaBridge | 184:08ed48f1de7f | 74 | // If changing format while you are the owner then just |
AnnaBridge | 184:08ed48f1de7f | 75 | // update frequency, but if owner is changed then even frequency should be |
Kojto | 169:e3b6fe271b81 | 76 | // updated which is done by acquire. |
Kojto | 169:e3b6fe271b81 | 77 | if (_owner == this) { |
Kojto | 169:e3b6fe271b81 | 78 | spi_frequency(&_spi, _hz); |
Kojto | 169:e3b6fe271b81 | 79 | } else { |
Kojto | 169:e3b6fe271b81 | 80 | _acquire(); |
Kojto | 169:e3b6fe271b81 | 81 | } |
<> | 149:156823d33999 | 82 | unlock(); |
<> | 149:156823d33999 | 83 | } |
<> | 149:156823d33999 | 84 | |
AnnaBridge | 187:0387e8f68319 | 85 | SPI *SPI::_owner = NULL; |
<> | 149:156823d33999 | 86 | SingletonPtr<PlatformMutex> SPI::_mutex; |
<> | 149:156823d33999 | 87 | |
AnnaBridge | 184:08ed48f1de7f | 88 | // ignore the fact there are multiple physical spis, and always update if it wasn't us last |
AnnaBridge | 187:0387e8f68319 | 89 | void SPI::aquire() |
AnnaBridge | 187:0387e8f68319 | 90 | { |
<> | 149:156823d33999 | 91 | lock(); |
AnnaBridge | 187:0387e8f68319 | 92 | if (_owner != this) { |
<> | 149:156823d33999 | 93 | spi_format(&_spi, _bits, _mode, 0); |
<> | 149:156823d33999 | 94 | spi_frequency(&_spi, _hz); |
<> | 149:156823d33999 | 95 | _owner = this; |
<> | 149:156823d33999 | 96 | } |
<> | 149:156823d33999 | 97 | unlock(); |
<> | 149:156823d33999 | 98 | } |
<> | 149:156823d33999 | 99 | |
Kojto | 169:e3b6fe271b81 | 100 | // Note: Private function with no locking |
AnnaBridge | 187:0387e8f68319 | 101 | void SPI::_acquire() |
AnnaBridge | 187:0387e8f68319 | 102 | { |
AnnaBridge | 187:0387e8f68319 | 103 | if (_owner != this) { |
Kojto | 169:e3b6fe271b81 | 104 | spi_format(&_spi, _bits, _mode, 0); |
Kojto | 169:e3b6fe271b81 | 105 | spi_frequency(&_spi, _hz); |
Kojto | 169:e3b6fe271b81 | 106 | _owner = this; |
Kojto | 169:e3b6fe271b81 | 107 | } |
Kojto | 169:e3b6fe271b81 | 108 | } |
Kojto | 169:e3b6fe271b81 | 109 | |
AnnaBridge | 187:0387e8f68319 | 110 | int SPI::write(int value) |
AnnaBridge | 187:0387e8f68319 | 111 | { |
<> | 149:156823d33999 | 112 | lock(); |
Kojto | 169:e3b6fe271b81 | 113 | _acquire(); |
<> | 149:156823d33999 | 114 | int ret = spi_master_write(&_spi, value); |
<> | 149:156823d33999 | 115 | unlock(); |
<> | 149:156823d33999 | 116 | return ret; |
<> | 149:156823d33999 | 117 | } |
<> | 149:156823d33999 | 118 | |
AnnaBridge | 187:0387e8f68319 | 119 | int SPI::write(const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length) |
AnnaBridge | 187:0387e8f68319 | 120 | { |
AnnaBridge | 167:e84263d55307 | 121 | lock(); |
Kojto | 169:e3b6fe271b81 | 122 | _acquire(); |
Kojto | 170:19eb464bc2be | 123 | int ret = spi_master_block_write(&_spi, tx_buffer, tx_length, rx_buffer, rx_length, _write_fill); |
AnnaBridge | 167:e84263d55307 | 124 | unlock(); |
AnnaBridge | 167:e84263d55307 | 125 | return ret; |
AnnaBridge | 167:e84263d55307 | 126 | } |
AnnaBridge | 167:e84263d55307 | 127 | |
AnnaBridge | 187:0387e8f68319 | 128 | void SPI::lock() |
AnnaBridge | 187:0387e8f68319 | 129 | { |
<> | 149:156823d33999 | 130 | _mutex->lock(); |
<> | 149:156823d33999 | 131 | } |
<> | 149:156823d33999 | 132 | |
AnnaBridge | 187:0387e8f68319 | 133 | void SPI::unlock() |
AnnaBridge | 187:0387e8f68319 | 134 | { |
<> | 149:156823d33999 | 135 | _mutex->unlock(); |
<> | 149:156823d33999 | 136 | } |
<> | 149:156823d33999 | 137 | |
AnnaBridge | 187:0387e8f68319 | 138 | void SPI::set_default_write_value(char data) |
AnnaBridge | 187:0387e8f68319 | 139 | { |
Kojto | 170:19eb464bc2be | 140 | lock(); |
Kojto | 170:19eb464bc2be | 141 | _write_fill = data; |
Kojto | 170:19eb464bc2be | 142 | unlock(); |
Kojto | 170:19eb464bc2be | 143 | } |
Kojto | 170:19eb464bc2be | 144 | |
<> | 149:156823d33999 | 145 | #if DEVICE_SPI_ASYNCH |
<> | 149:156823d33999 | 146 | |
AnnaBridge | 187:0387e8f68319 | 147 | int SPI::transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t &callback, int event) |
<> | 149:156823d33999 | 148 | { |
<> | 149:156823d33999 | 149 | if (spi_active(&_spi)) { |
<> | 149:156823d33999 | 150 | return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event); |
<> | 149:156823d33999 | 151 | } |
<> | 149:156823d33999 | 152 | start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event); |
<> | 149:156823d33999 | 153 | return 0; |
<> | 149:156823d33999 | 154 | } |
<> | 149:156823d33999 | 155 | |
<> | 149:156823d33999 | 156 | void SPI::abort_transfer() |
<> | 149:156823d33999 | 157 | { |
<> | 149:156823d33999 | 158 | spi_abort_asynch(&_spi); |
Anna Bridge |
180:96ed750bd169 | 159 | unlock_deep_sleep(); |
<> | 149:156823d33999 | 160 | #if TRANSACTION_QUEUE_SIZE_SPI |
<> | 149:156823d33999 | 161 | dequeue_transaction(); |
<> | 149:156823d33999 | 162 | #endif |
<> | 149:156823d33999 | 163 | } |
<> | 149:156823d33999 | 164 | |
<> | 149:156823d33999 | 165 | |
<> | 149:156823d33999 | 166 | void SPI::clear_transfer_buffer() |
<> | 149:156823d33999 | 167 | { |
<> | 149:156823d33999 | 168 | #if TRANSACTION_QUEUE_SIZE_SPI |
<> | 149:156823d33999 | 169 | _transaction_buffer.reset(); |
<> | 149:156823d33999 | 170 | #endif |
<> | 149:156823d33999 | 171 | } |
<> | 149:156823d33999 | 172 | |
<> | 149:156823d33999 | 173 | void SPI::abort_all_transfers() |
<> | 149:156823d33999 | 174 | { |
<> | 149:156823d33999 | 175 | clear_transfer_buffer(); |
<> | 149:156823d33999 | 176 | abort_transfer(); |
<> | 149:156823d33999 | 177 | } |
<> | 149:156823d33999 | 178 | |
<> | 149:156823d33999 | 179 | int SPI::set_dma_usage(DMAUsage usage) |
<> | 149:156823d33999 | 180 | { |
<> | 149:156823d33999 | 181 | if (spi_active(&_spi)) { |
<> | 149:156823d33999 | 182 | return -1; |
<> | 149:156823d33999 | 183 | } |
<> | 149:156823d33999 | 184 | _usage = usage; |
<> | 149:156823d33999 | 185 | return 0; |
<> | 149:156823d33999 | 186 | } |
<> | 149:156823d33999 | 187 | |
AnnaBridge | 187:0387e8f68319 | 188 | int SPI::queue_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t &callback, int event) |
<> | 149:156823d33999 | 189 | { |
<> | 149:156823d33999 | 190 | #if TRANSACTION_QUEUE_SIZE_SPI |
<> | 149:156823d33999 | 191 | transaction_t t; |
<> | 149:156823d33999 | 192 | |
<> | 149:156823d33999 | 193 | t.tx_buffer = const_cast<void *>(tx_buffer); |
<> | 149:156823d33999 | 194 | t.tx_length = tx_length; |
<> | 149:156823d33999 | 195 | t.rx_buffer = rx_buffer; |
<> | 149:156823d33999 | 196 | t.rx_length = rx_length; |
<> | 149:156823d33999 | 197 | t.event = event; |
<> | 149:156823d33999 | 198 | t.callback = callback; |
<> | 149:156823d33999 | 199 | t.width = bit_width; |
<> | 149:156823d33999 | 200 | Transaction<SPI> transaction(this, t); |
<> | 149:156823d33999 | 201 | if (_transaction_buffer.full()) { |
<> | 149:156823d33999 | 202 | return -1; // the buffer is full |
<> | 149:156823d33999 | 203 | } else { |
<> | 149:156823d33999 | 204 | core_util_critical_section_enter(); |
<> | 149:156823d33999 | 205 | _transaction_buffer.push(transaction); |
<> | 149:156823d33999 | 206 | if (!spi_active(&_spi)) { |
<> | 149:156823d33999 | 207 | dequeue_transaction(); |
<> | 149:156823d33999 | 208 | } |
<> | 149:156823d33999 | 209 | core_util_critical_section_exit(); |
<> | 149:156823d33999 | 210 | return 0; |
<> | 149:156823d33999 | 211 | } |
<> | 149:156823d33999 | 212 | #else |
<> | 149:156823d33999 | 213 | return -1; |
<> | 149:156823d33999 | 214 | #endif |
<> | 149:156823d33999 | 215 | } |
<> | 149:156823d33999 | 216 | |
AnnaBridge | 187:0387e8f68319 | 217 | void SPI::start_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t &callback, int event) |
<> | 149:156823d33999 | 218 | { |
Anna Bridge |
180:96ed750bd169 | 219 | lock_deep_sleep(); |
Kojto | 169:e3b6fe271b81 | 220 | _acquire(); |
<> | 149:156823d33999 | 221 | _callback = callback; |
<> | 149:156823d33999 | 222 | _irq.callback(&SPI::irq_handler_asynch); |
AnnaBridge | 187:0387e8f68319 | 223 | spi_master_transfer(&_spi, tx_buffer, tx_length, rx_buffer, rx_length, bit_width, _irq.entry(), event, _usage); |
<> | 149:156823d33999 | 224 | } |
<> | 149:156823d33999 | 225 | |
Anna Bridge |
180:96ed750bd169 | 226 | void SPI::lock_deep_sleep() |
Anna Bridge |
180:96ed750bd169 | 227 | { |
Anna Bridge |
180:96ed750bd169 | 228 | if (_deep_sleep_locked == false) { |
Anna Bridge |
180:96ed750bd169 | 229 | sleep_manager_lock_deep_sleep(); |
Anna Bridge |
180:96ed750bd169 | 230 | _deep_sleep_locked = true; |
Anna Bridge |
180:96ed750bd169 | 231 | } |
Anna Bridge |
180:96ed750bd169 | 232 | } |
Anna Bridge |
180:96ed750bd169 | 233 | |
Anna Bridge |
180:96ed750bd169 | 234 | void SPI::unlock_deep_sleep() |
Anna Bridge |
180:96ed750bd169 | 235 | { |
Anna Bridge |
180:96ed750bd169 | 236 | if (_deep_sleep_locked == true) { |
Anna Bridge |
180:96ed750bd169 | 237 | sleep_manager_unlock_deep_sleep(); |
Anna Bridge |
180:96ed750bd169 | 238 | _deep_sleep_locked = false; |
Anna Bridge |
180:96ed750bd169 | 239 | } |
Anna Bridge |
180:96ed750bd169 | 240 | } |
Anna Bridge |
180:96ed750bd169 | 241 | |
<> | 149:156823d33999 | 242 | #if TRANSACTION_QUEUE_SIZE_SPI |
<> | 149:156823d33999 | 243 | |
<> | 149:156823d33999 | 244 | void SPI::start_transaction(transaction_t *data) |
<> | 149:156823d33999 | 245 | { |
<> | 149:156823d33999 | 246 | start_transfer(data->tx_buffer, data->tx_length, data->rx_buffer, data->rx_length, data->width, data->callback, data->event); |
<> | 149:156823d33999 | 247 | } |
<> | 149:156823d33999 | 248 | |
<> | 149:156823d33999 | 249 | void SPI::dequeue_transaction() |
<> | 149:156823d33999 | 250 | { |
<> | 149:156823d33999 | 251 | Transaction<SPI> t; |
<> | 149:156823d33999 | 252 | if (_transaction_buffer.pop(t)) { |
AnnaBridge | 187:0387e8f68319 | 253 | SPI *obj = t.get_object(); |
AnnaBridge | 187:0387e8f68319 | 254 | transaction_t *data = t.get_transaction(); |
<> | 149:156823d33999 | 255 | obj->start_transaction(data); |
<> | 149:156823d33999 | 256 | } |
<> | 149:156823d33999 | 257 | } |
<> | 149:156823d33999 | 258 | |
<> | 149:156823d33999 | 259 | #endif |
<> | 149:156823d33999 | 260 | |
<> | 149:156823d33999 | 261 | void SPI::irq_handler_asynch(void) |
<> | 149:156823d33999 | 262 | { |
<> | 149:156823d33999 | 263 | int event = spi_irq_handler_asynch(&_spi); |
<> | 149:156823d33999 | 264 | if (_callback && (event & SPI_EVENT_ALL)) { |
Anna Bridge |
180:96ed750bd169 | 265 | unlock_deep_sleep(); |
<> | 149:156823d33999 | 266 | _callback.call(event & SPI_EVENT_ALL); |
<> | 149:156823d33999 | 267 | } |
<> | 149:156823d33999 | 268 | #if TRANSACTION_QUEUE_SIZE_SPI |
<> | 149:156823d33999 | 269 | if (event & (SPI_EVENT_ALL | SPI_EVENT_INTERNAL_TRANSFER_COMPLETE)) { |
AnnaBridge | 184:08ed48f1de7f | 270 | // SPI peripheral is free (event happened), dequeue transaction |
<> | 149:156823d33999 | 271 | dequeue_transaction(); |
<> | 149:156823d33999 | 272 | } |
<> | 149:156823d33999 | 273 | #endif |
<> | 149:156823d33999 | 274 | } |
<> | 149:156823d33999 | 275 | |
<> | 149:156823d33999 | 276 | #endif |
<> | 149:156823d33999 | 277 | |
<> | 149:156823d33999 | 278 | } // namespace mbed |
<> | 149:156823d33999 | 279 | |
<> | 149:156823d33999 | 280 | #endif |