PHung Tung / SRC_STM32F7

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common/SPI.cpp@0:e87aa4c49e95, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:51:46 2019 +0000
Revision:
0:e87aa4c49e95
libray

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phungductung 0:e87aa4c49e95 1 /* mbed Microcontroller Library
phungductung 0:e87aa4c49e95 2 * Copyright (c) 2006-2013 ARM Limited
phungductung 0:e87aa4c49e95 3 *
phungductung 0:e87aa4c49e95 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:e87aa4c49e95 5 * you may not use this file except in compliance with the License.
phungductung 0:e87aa4c49e95 6 * You may obtain a copy of the License at
phungductung 0:e87aa4c49e95 7 *
phungductung 0:e87aa4c49e95 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:e87aa4c49e95 9 *
phungductung 0:e87aa4c49e95 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:e87aa4c49e95 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:e87aa4c49e95 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:e87aa4c49e95 13 * See the License for the specific language governing permissions and
phungductung 0:e87aa4c49e95 14 * limitations under the License.
phungductung 0:e87aa4c49e95 15 */
phungductung 0:e87aa4c49e95 16 #include "SPI.h"
phungductung 0:e87aa4c49e95 17
phungductung 0:e87aa4c49e95 18 #if DEVICE_SPI
phungductung 0:e87aa4c49e95 19
phungductung 0:e87aa4c49e95 20 namespace mbed {
phungductung 0:e87aa4c49e95 21
phungductung 0:e87aa4c49e95 22 #if DEVICE_SPI_ASYNCH && TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:e87aa4c49e95 23 CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> SPI::_transaction_buffer;
phungductung 0:e87aa4c49e95 24 #endif
phungductung 0:e87aa4c49e95 25
phungductung 0:e87aa4c49e95 26 SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName ssel) :
phungductung 0:e87aa4c49e95 27 _spi(),
phungductung 0:e87aa4c49e95 28 #if DEVICE_SPI_ASYNCH
phungductung 0:e87aa4c49e95 29 _irq(this),
phungductung 0:e87aa4c49e95 30 _usage(DMA_USAGE_NEVER),
phungductung 0:e87aa4c49e95 31 #endif
phungductung 0:e87aa4c49e95 32 _bits(8),
phungductung 0:e87aa4c49e95 33 _mode(0),
phungductung 0:e87aa4c49e95 34 _hz(1000000) {
phungductung 0:e87aa4c49e95 35 spi_init(&_spi, mosi, miso, sclk, ssel);
phungductung 0:e87aa4c49e95 36 spi_format(&_spi, _bits, _mode, 0);
phungductung 0:e87aa4c49e95 37 spi_frequency(&_spi, _hz);
phungductung 0:e87aa4c49e95 38 }
phungductung 0:e87aa4c49e95 39
phungductung 0:e87aa4c49e95 40 void SPI::format(int bits, int mode) {
phungductung 0:e87aa4c49e95 41 _bits = bits;
phungductung 0:e87aa4c49e95 42 _mode = mode;
phungductung 0:e87aa4c49e95 43 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
phungductung 0:e87aa4c49e95 44 aquire();
phungductung 0:e87aa4c49e95 45 }
phungductung 0:e87aa4c49e95 46
phungductung 0:e87aa4c49e95 47 void SPI::frequency(int hz) {
phungductung 0:e87aa4c49e95 48 _hz = hz;
phungductung 0:e87aa4c49e95 49 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
phungductung 0:e87aa4c49e95 50 aquire();
phungductung 0:e87aa4c49e95 51 }
phungductung 0:e87aa4c49e95 52
phungductung 0:e87aa4c49e95 53 SPI* SPI::_owner = NULL;
phungductung 0:e87aa4c49e95 54
phungductung 0:e87aa4c49e95 55 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
phungductung 0:e87aa4c49e95 56 void SPI::aquire() {
phungductung 0:e87aa4c49e95 57 if (_owner != this) {
phungductung 0:e87aa4c49e95 58 spi_format(&_spi, _bits, _mode, 0);
phungductung 0:e87aa4c49e95 59 spi_frequency(&_spi, _hz);
phungductung 0:e87aa4c49e95 60 _owner = this;
phungductung 0:e87aa4c49e95 61 }
phungductung 0:e87aa4c49e95 62 }
phungductung 0:e87aa4c49e95 63
phungductung 0:e87aa4c49e95 64 int SPI::write(int value) {
phungductung 0:e87aa4c49e95 65 aquire();
phungductung 0:e87aa4c49e95 66 return spi_master_write(&_spi, value);
phungductung 0:e87aa4c49e95 67 }
phungductung 0:e87aa4c49e95 68
phungductung 0:e87aa4c49e95 69 #if DEVICE_SPI_ASYNCH
phungductung 0:e87aa4c49e95 70
phungductung 0:e87aa4c49e95 71 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)
phungductung 0:e87aa4c49e95 72 {
phungductung 0:e87aa4c49e95 73 if (spi_active(&_spi)) {
phungductung 0:e87aa4c49e95 74 return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event);
phungductung 0:e87aa4c49e95 75 }
phungductung 0:e87aa4c49e95 76 start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event);
phungductung 0:e87aa4c49e95 77 return 0;
phungductung 0:e87aa4c49e95 78 }
phungductung 0:e87aa4c49e95 79
phungductung 0:e87aa4c49e95 80 void SPI::abort_transfer()
phungductung 0:e87aa4c49e95 81 {
phungductung 0:e87aa4c49e95 82 spi_abort_asynch(&_spi);
phungductung 0:e87aa4c49e95 83 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:e87aa4c49e95 84 dequeue_transaction();
phungductung 0:e87aa4c49e95 85 #endif
phungductung 0:e87aa4c49e95 86 }
phungductung 0:e87aa4c49e95 87
phungductung 0:e87aa4c49e95 88
phungductung 0:e87aa4c49e95 89 void SPI::clear_transfer_buffer()
phungductung 0:e87aa4c49e95 90 {
phungductung 0:e87aa4c49e95 91 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:e87aa4c49e95 92 _transaction_buffer.reset();
phungductung 0:e87aa4c49e95 93 #endif
phungductung 0:e87aa4c49e95 94 }
phungductung 0:e87aa4c49e95 95
phungductung 0:e87aa4c49e95 96 void SPI::abort_all_transfers()
phungductung 0:e87aa4c49e95 97 {
phungductung 0:e87aa4c49e95 98 clear_transfer_buffer();
phungductung 0:e87aa4c49e95 99 abort_transfer();
phungductung 0:e87aa4c49e95 100 }
phungductung 0:e87aa4c49e95 101
phungductung 0:e87aa4c49e95 102 int SPI::set_dma_usage(DMAUsage usage)
phungductung 0:e87aa4c49e95 103 {
phungductung 0:e87aa4c49e95 104 if (spi_active(&_spi)) {
phungductung 0:e87aa4c49e95 105 return -1;
phungductung 0:e87aa4c49e95 106 }
phungductung 0:e87aa4c49e95 107 _usage = usage;
phungductung 0:e87aa4c49e95 108 return 0;
phungductung 0:e87aa4c49e95 109 }
phungductung 0:e87aa4c49e95 110
phungductung 0:e87aa4c49e95 111 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)
phungductung 0:e87aa4c49e95 112 {
phungductung 0:e87aa4c49e95 113 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:e87aa4c49e95 114 transaction_t t;
phungductung 0:e87aa4c49e95 115
phungductung 0:e87aa4c49e95 116 t.tx_buffer = const_cast<void *>(tx_buffer);
phungductung 0:e87aa4c49e95 117 t.tx_length = tx_length;
phungductung 0:e87aa4c49e95 118 t.rx_buffer = rx_buffer;
phungductung 0:e87aa4c49e95 119 t.rx_length = rx_length;
phungductung 0:e87aa4c49e95 120 t.event = event;
phungductung 0:e87aa4c49e95 121 t.callback = callback;
phungductung 0:e87aa4c49e95 122 t.width = bit_width;
phungductung 0:e87aa4c49e95 123 Transaction<SPI> transaction(this, t);
phungductung 0:e87aa4c49e95 124 if (_transaction_buffer.full()) {
phungductung 0:e87aa4c49e95 125 return -1; // the buffer is full
phungductung 0:e87aa4c49e95 126 } else {
phungductung 0:e87aa4c49e95 127 __disable_irq();
phungductung 0:e87aa4c49e95 128 _transaction_buffer.push(transaction);
phungductung 0:e87aa4c49e95 129 if (!spi_active(&_spi)) {
phungductung 0:e87aa4c49e95 130 dequeue_transaction();
phungductung 0:e87aa4c49e95 131 }
phungductung 0:e87aa4c49e95 132 __enable_irq();
phungductung 0:e87aa4c49e95 133 return 0;
phungductung 0:e87aa4c49e95 134 }
phungductung 0:e87aa4c49e95 135 #else
phungductung 0:e87aa4c49e95 136 return -1;
phungductung 0:e87aa4c49e95 137 #endif
phungductung 0:e87aa4c49e95 138 }
phungductung 0:e87aa4c49e95 139
phungductung 0:e87aa4c49e95 140 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)
phungductung 0:e87aa4c49e95 141 {
phungductung 0:e87aa4c49e95 142 aquire();
phungductung 0:e87aa4c49e95 143 _callback = callback;
phungductung 0:e87aa4c49e95 144 _irq.callback(&SPI::irq_handler_asynch);
phungductung 0:e87aa4c49e95 145 spi_master_transfer(&_spi, tx_buffer, tx_length, rx_buffer, rx_length, bit_width, _irq.entry(), event , _usage);
phungductung 0:e87aa4c49e95 146 }
phungductung 0:e87aa4c49e95 147
phungductung 0:e87aa4c49e95 148 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:e87aa4c49e95 149
phungductung 0:e87aa4c49e95 150 void SPI::start_transaction(transaction_t *data)
phungductung 0:e87aa4c49e95 151 {
phungductung 0:e87aa4c49e95 152 start_transfer(data->tx_buffer, data->tx_length, data->rx_buffer, data->rx_length, data->width, data->callback, data->event);
phungductung 0:e87aa4c49e95 153 }
phungductung 0:e87aa4c49e95 154
phungductung 0:e87aa4c49e95 155 void SPI::dequeue_transaction()
phungductung 0:e87aa4c49e95 156 {
phungductung 0:e87aa4c49e95 157 Transaction<SPI> t;
phungductung 0:e87aa4c49e95 158 if (_transaction_buffer.pop(t)) {
phungductung 0:e87aa4c49e95 159 SPI* obj = t.get_object();
phungductung 0:e87aa4c49e95 160 transaction_t* data = t.get_transaction();
phungductung 0:e87aa4c49e95 161 obj->start_transaction(data);
phungductung 0:e87aa4c49e95 162 }
phungductung 0:e87aa4c49e95 163 }
phungductung 0:e87aa4c49e95 164
phungductung 0:e87aa4c49e95 165 #endif
phungductung 0:e87aa4c49e95 166
phungductung 0:e87aa4c49e95 167 void SPI::irq_handler_asynch(void)
phungductung 0:e87aa4c49e95 168 {
phungductung 0:e87aa4c49e95 169 int event = spi_irq_handler_asynch(&_spi);
phungductung 0:e87aa4c49e95 170 if (_callback && (event & SPI_EVENT_ALL)) {
phungductung 0:e87aa4c49e95 171 _callback.call(event & SPI_EVENT_ALL);
phungductung 0:e87aa4c49e95 172 }
phungductung 0:e87aa4c49e95 173 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:e87aa4c49e95 174 if (event & (SPI_EVENT_ALL | SPI_EVENT_INTERNAL_TRANSFER_COMPLETE)) {
phungductung 0:e87aa4c49e95 175 // SPI peripheral is free (event happend), dequeue transaction
phungductung 0:e87aa4c49e95 176 dequeue_transaction();
phungductung 0:e87aa4c49e95 177 }
phungductung 0:e87aa4c49e95 178 #endif
phungductung 0:e87aa4c49e95 179 }
phungductung 0:e87aa4c49e95 180
phungductung 0:e87aa4c49e95 181 #endif
phungductung 0:e87aa4c49e95 182
phungductung 0:e87aa4c49e95 183 } // namespace mbed
phungductung 0:e87aa4c49e95 184
phungductung 0:e87aa4c49e95 185 #endif