PHung Tung / DISCO-F746_WAV_PLAYER

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Dependencies:   F746_GUI SD_PlayerSkeleton F746_SAI_IO

SRC_STM32F7/common/SPI.cpp@0:8ede47d38d10, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:37:21 2019 +0000
Revision:
0:8ede47d38d10
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phungductung 0:8ede47d38d10 1 /* mbed Microcontroller Library
phungductung 0:8ede47d38d10 2 * Copyright (c) 2006-2013 ARM Limited
phungductung 0:8ede47d38d10 3 *
phungductung 0:8ede47d38d10 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:8ede47d38d10 5 * you may not use this file except in compliance with the License.
phungductung 0:8ede47d38d10 6 * You may obtain a copy of the License at
phungductung 0:8ede47d38d10 7 *
phungductung 0:8ede47d38d10 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:8ede47d38d10 9 *
phungductung 0:8ede47d38d10 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:8ede47d38d10 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:8ede47d38d10 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:8ede47d38d10 13 * See the License for the specific language governing permissions and
phungductung 0:8ede47d38d10 14 * limitations under the License.
phungductung 0:8ede47d38d10 15 */
phungductung 0:8ede47d38d10 16 #include "SPI.h"
phungductung 0:8ede47d38d10 17
phungductung 0:8ede47d38d10 18 #if DEVICE_SPI
phungductung 0:8ede47d38d10 19
phungductung 0:8ede47d38d10 20 namespace mbed {
phungductung 0:8ede47d38d10 21
phungductung 0:8ede47d38d10 22 #if DEVICE_SPI_ASYNCH && TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:8ede47d38d10 23 CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> SPI::_transaction_buffer;
phungductung 0:8ede47d38d10 24 #endif
phungductung 0:8ede47d38d10 25
phungductung 0:8ede47d38d10 26 SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName ssel) :
phungductung 0:8ede47d38d10 27 _spi(),
phungductung 0:8ede47d38d10 28 #if DEVICE_SPI_ASYNCH
phungductung 0:8ede47d38d10 29 _irq(this),
phungductung 0:8ede47d38d10 30 _usage(DMA_USAGE_NEVER),
phungductung 0:8ede47d38d10 31 #endif
phungductung 0:8ede47d38d10 32 _bits(8),
phungductung 0:8ede47d38d10 33 _mode(0),
phungductung 0:8ede47d38d10 34 _hz(1000000) {
phungductung 0:8ede47d38d10 35 spi_init(&_spi, mosi, miso, sclk, ssel);
phungductung 0:8ede47d38d10 36 spi_format(&_spi, _bits, _mode, 0);
phungductung 0:8ede47d38d10 37 spi_frequency(&_spi, _hz);
phungductung 0:8ede47d38d10 38 }
phungductung 0:8ede47d38d10 39
phungductung 0:8ede47d38d10 40 void SPI::format(int bits, int mode) {
phungductung 0:8ede47d38d10 41 _bits = bits;
phungductung 0:8ede47d38d10 42 _mode = mode;
phungductung 0:8ede47d38d10 43 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
phungductung 0:8ede47d38d10 44 aquire();
phungductung 0:8ede47d38d10 45 }
phungductung 0:8ede47d38d10 46
phungductung 0:8ede47d38d10 47 void SPI::frequency(int hz) {
phungductung 0:8ede47d38d10 48 _hz = hz;
phungductung 0:8ede47d38d10 49 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
phungductung 0:8ede47d38d10 50 aquire();
phungductung 0:8ede47d38d10 51 }
phungductung 0:8ede47d38d10 52
phungductung 0:8ede47d38d10 53 SPI* SPI::_owner = NULL;
phungductung 0:8ede47d38d10 54
phungductung 0:8ede47d38d10 55 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
phungductung 0:8ede47d38d10 56 void SPI::aquire() {
phungductung 0:8ede47d38d10 57 if (_owner != this) {
phungductung 0:8ede47d38d10 58 spi_format(&_spi, _bits, _mode, 0);
phungductung 0:8ede47d38d10 59 spi_frequency(&_spi, _hz);
phungductung 0:8ede47d38d10 60 _owner = this;
phungductung 0:8ede47d38d10 61 }
phungductung 0:8ede47d38d10 62 }
phungductung 0:8ede47d38d10 63
phungductung 0:8ede47d38d10 64 int SPI::write(int value) {
phungductung 0:8ede47d38d10 65 aquire();
phungductung 0:8ede47d38d10 66 return spi_master_write(&_spi, value);
phungductung 0:8ede47d38d10 67 }
phungductung 0:8ede47d38d10 68
phungductung 0:8ede47d38d10 69 #if DEVICE_SPI_ASYNCH
phungductung 0:8ede47d38d10 70
phungductung 0:8ede47d38d10 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 0:8ede47d38d10 72 {
phungductung 0:8ede47d38d10 73 if (spi_active(&_spi)) {
phungductung 0:8ede47d38d10 74 return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event);
phungductung 0:8ede47d38d10 75 }
phungductung 0:8ede47d38d10 76 start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event);
phungductung 0:8ede47d38d10 77 return 0;
phungductung 0:8ede47d38d10 78 }
phungductung 0:8ede47d38d10 79
phungductung 0:8ede47d38d10 80 void SPI::abort_transfer()
phungductung 0:8ede47d38d10 81 {
phungductung 0:8ede47d38d10 82 spi_abort_asynch(&_spi);
phungductung 0:8ede47d38d10 83 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:8ede47d38d10 84 dequeue_transaction();
phungductung 0:8ede47d38d10 85 #endif
phungductung 0:8ede47d38d10 86 }
phungductung 0:8ede47d38d10 87
phungductung 0:8ede47d38d10 88
phungductung 0:8ede47d38d10 89 void SPI::clear_transfer_buffer()
phungductung 0:8ede47d38d10 90 {
phungductung 0:8ede47d38d10 91 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:8ede47d38d10 92 _transaction_buffer.reset();
phungductung 0:8ede47d38d10 93 #endif
phungductung 0:8ede47d38d10 94 }
phungductung 0:8ede47d38d10 95
phungductung 0:8ede47d38d10 96 void SPI::abort_all_transfers()
phungductung 0:8ede47d38d10 97 {
phungductung 0:8ede47d38d10 98 clear_transfer_buffer();
phungductung 0:8ede47d38d10 99 abort_transfer();
phungductung 0:8ede47d38d10 100 }
phungductung 0:8ede47d38d10 101
phungductung 0:8ede47d38d10 102 int SPI::set_dma_usage(DMAUsage usage)
phungductung 0:8ede47d38d10 103 {
phungductung 0:8ede47d38d10 104 if (spi_active(&_spi)) {
phungductung 0:8ede47d38d10 105 return -1;
phungductung 0:8ede47d38d10 106 }
phungductung 0:8ede47d38d10 107 _usage = usage;
phungductung 0:8ede47d38d10 108 return 0;
phungductung 0:8ede47d38d10 109 }
phungductung 0:8ede47d38d10 110
phungductung 0:8ede47d38d10 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 0:8ede47d38d10 112 {
phungductung 0:8ede47d38d10 113 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:8ede47d38d10 114 transaction_t t;
phungductung 0:8ede47d38d10 115
phungductung 0:8ede47d38d10 116 t.tx_buffer = const_cast<void *>(tx_buffer);
phungductung 0:8ede47d38d10 117 t.tx_length = tx_length;
phungductung 0:8ede47d38d10 118 t.rx_buffer = rx_buffer;
phungductung 0:8ede47d38d10 119 t.rx_length = rx_length;
phungductung 0:8ede47d38d10 120 t.event = event;
phungductung 0:8ede47d38d10 121 t.callback = callback;
phungductung 0:8ede47d38d10 122 t.width = bit_width;
phungductung 0:8ede47d38d10 123 Transaction<SPI> transaction(this, t);
phungductung 0:8ede47d38d10 124 if (_transaction_buffer.full()) {
phungductung 0:8ede47d38d10 125 return -1; // the buffer is full
phungductung 0:8ede47d38d10 126 } else {
phungductung 0:8ede47d38d10 127 __disable_irq();
phungductung 0:8ede47d38d10 128 _transaction_buffer.push(transaction);
phungductung 0:8ede47d38d10 129 if (!spi_active(&_spi)) {
phungductung 0:8ede47d38d10 130 dequeue_transaction();
phungductung 0:8ede47d38d10 131 }
phungductung 0:8ede47d38d10 132 __enable_irq();
phungductung 0:8ede47d38d10 133 return 0;
phungductung 0:8ede47d38d10 134 }
phungductung 0:8ede47d38d10 135 #else
phungductung 0:8ede47d38d10 136 return -1;
phungductung 0:8ede47d38d10 137 #endif
phungductung 0:8ede47d38d10 138 }
phungductung 0:8ede47d38d10 139
phungductung 0:8ede47d38d10 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 0:8ede47d38d10 141 {
phungductung 0:8ede47d38d10 142 aquire();
phungductung 0:8ede47d38d10 143 _callback = callback;
phungductung 0:8ede47d38d10 144 _irq.callback(&SPI::irq_handler_asynch);
phungductung 0:8ede47d38d10 145 spi_master_transfer(&_spi, tx_buffer, tx_length, rx_buffer, rx_length, bit_width, _irq.entry(), event , _usage);
phungductung 0:8ede47d38d10 146 }
phungductung 0:8ede47d38d10 147
phungductung 0:8ede47d38d10 148 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:8ede47d38d10 149
phungductung 0:8ede47d38d10 150 void SPI::start_transaction(transaction_t *data)
phungductung 0:8ede47d38d10 151 {
phungductung 0:8ede47d38d10 152 start_transfer(data->tx_buffer, data->tx_length, data->rx_buffer, data->rx_length, data->width, data->callback, data->event);
phungductung 0:8ede47d38d10 153 }
phungductung 0:8ede47d38d10 154
phungductung 0:8ede47d38d10 155 void SPI::dequeue_transaction()
phungductung 0:8ede47d38d10 156 {
phungductung 0:8ede47d38d10 157 Transaction<SPI> t;
phungductung 0:8ede47d38d10 158 if (_transaction_buffer.pop(t)) {
phungductung 0:8ede47d38d10 159 SPI* obj = t.get_object();
phungductung 0:8ede47d38d10 160 transaction_t* data = t.get_transaction();
phungductung 0:8ede47d38d10 161 obj->start_transaction(data);
phungductung 0:8ede47d38d10 162 }
phungductung 0:8ede47d38d10 163 }
phungductung 0:8ede47d38d10 164
phungductung 0:8ede47d38d10 165 #endif
phungductung 0:8ede47d38d10 166
phungductung 0:8ede47d38d10 167 void SPI::irq_handler_asynch(void)
phungductung 0:8ede47d38d10 168 {
phungductung 0:8ede47d38d10 169 int event = spi_irq_handler_asynch(&_spi);
phungductung 0:8ede47d38d10 170 if (_callback && (event & SPI_EVENT_ALL)) {
phungductung 0:8ede47d38d10 171 _callback.call(event & SPI_EVENT_ALL);
phungductung 0:8ede47d38d10 172 }
phungductung 0:8ede47d38d10 173 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:8ede47d38d10 174 if (event & (SPI_EVENT_ALL | SPI_EVENT_INTERNAL_TRANSFER_COMPLETE)) {
phungductung 0:8ede47d38d10 175 // SPI peripheral is free (event happend), dequeue transaction
phungductung 0:8ede47d38d10 176 dequeue_transaction();
phungductung 0:8ede47d38d10 177 }
phungductung 0:8ede47d38d10 178 #endif
phungductung 0:8ede47d38d10 179 }
phungductung 0:8ede47d38d10 180
phungductung 0:8ede47d38d10 181 #endif
phungductung 0:8ede47d38d10 182
phungductung 0:8ede47d38d10 183 } // namespace mbed
phungductung 0:8ede47d38d10 184
phungductung 0:8ede47d38d10 185 #endif