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mbed_src_STM32F7/common/SPI.cpp@0:aa3fc5ad02f7, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 09:08:29 2019 +0000
Revision:
0:aa3fc5ad02f7
SPKT

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phungductung 0:aa3fc5ad02f7 1 /* mbed Microcontroller Library
phungductung 0:aa3fc5ad02f7 2 * Copyright (c) 2006-2013 ARM Limited
phungductung 0:aa3fc5ad02f7 3 *
phungductung 0:aa3fc5ad02f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:aa3fc5ad02f7 5 * you may not use this file except in compliance with the License.
phungductung 0:aa3fc5ad02f7 6 * You may obtain a copy of the License at
phungductung 0:aa3fc5ad02f7 7 *
phungductung 0:aa3fc5ad02f7 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:aa3fc5ad02f7 9 *
phungductung 0:aa3fc5ad02f7 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:aa3fc5ad02f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:aa3fc5ad02f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:aa3fc5ad02f7 13 * See the License for the specific language governing permissions and
phungductung 0:aa3fc5ad02f7 14 * limitations under the License.
phungductung 0:aa3fc5ad02f7 15 */
phungductung 0:aa3fc5ad02f7 16 #include "SPI.h"
phungductung 0:aa3fc5ad02f7 17
phungductung 0:aa3fc5ad02f7 18 #if DEVICE_SPI
phungductung 0:aa3fc5ad02f7 19
phungductung 0:aa3fc5ad02f7 20 namespace mbed {
phungductung 0:aa3fc5ad02f7 21
phungductung 0:aa3fc5ad02f7 22 #if DEVICE_SPI_ASYNCH && TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:aa3fc5ad02f7 23 CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> SPI::_transaction_buffer;
phungductung 0:aa3fc5ad02f7 24 #endif
phungductung 0:aa3fc5ad02f7 25
phungductung 0:aa3fc5ad02f7 26 SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName ssel) :
phungductung 0:aa3fc5ad02f7 27 _spi(),
phungductung 0:aa3fc5ad02f7 28 #if DEVICE_SPI_ASYNCH
phungductung 0:aa3fc5ad02f7 29 _irq(this),
phungductung 0:aa3fc5ad02f7 30 _usage(DMA_USAGE_NEVER),
phungductung 0:aa3fc5ad02f7 31 #endif
phungductung 0:aa3fc5ad02f7 32 _bits(8),
phungductung 0:aa3fc5ad02f7 33 _mode(0),
phungductung 0:aa3fc5ad02f7 34 _hz(1000000) {
phungductung 0:aa3fc5ad02f7 35 spi_init(&_spi, mosi, miso, sclk, ssel);
phungductung 0:aa3fc5ad02f7 36 spi_format(&_spi, _bits, _mode, 0);
phungductung 0:aa3fc5ad02f7 37 spi_frequency(&_spi, _hz);
phungductung 0:aa3fc5ad02f7 38 }
phungductung 0:aa3fc5ad02f7 39
phungductung 0:aa3fc5ad02f7 40 void SPI::format(int bits, int mode) {
phungductung 0:aa3fc5ad02f7 41 _bits = bits;
phungductung 0:aa3fc5ad02f7 42 _mode = mode;
phungductung 0:aa3fc5ad02f7 43 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
phungductung 0:aa3fc5ad02f7 44 aquire();
phungductung 0:aa3fc5ad02f7 45 }
phungductung 0:aa3fc5ad02f7 46
phungductung 0:aa3fc5ad02f7 47 void SPI::frequency(int hz) {
phungductung 0:aa3fc5ad02f7 48 _hz = hz;
phungductung 0:aa3fc5ad02f7 49 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
phungductung 0:aa3fc5ad02f7 50 aquire();
phungductung 0:aa3fc5ad02f7 51 }
phungductung 0:aa3fc5ad02f7 52
phungductung 0:aa3fc5ad02f7 53 SPI* SPI::_owner = NULL;
phungductung 0:aa3fc5ad02f7 54
phungductung 0:aa3fc5ad02f7 55 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
phungductung 0:aa3fc5ad02f7 56 void SPI::aquire() {
phungductung 0:aa3fc5ad02f7 57 if (_owner != this) {
phungductung 0:aa3fc5ad02f7 58 spi_format(&_spi, _bits, _mode, 0);
phungductung 0:aa3fc5ad02f7 59 spi_frequency(&_spi, _hz);
phungductung 0:aa3fc5ad02f7 60 _owner = this;
phungductung 0:aa3fc5ad02f7 61 }
phungductung 0:aa3fc5ad02f7 62 }
phungductung 0:aa3fc5ad02f7 63
phungductung 0:aa3fc5ad02f7 64 int SPI::write(int value) {
phungductung 0:aa3fc5ad02f7 65 aquire();
phungductung 0:aa3fc5ad02f7 66 return spi_master_write(&_spi, value);
phungductung 0:aa3fc5ad02f7 67 }
phungductung 0:aa3fc5ad02f7 68
phungductung 0:aa3fc5ad02f7 69 #if DEVICE_SPI_ASYNCH
phungductung 0:aa3fc5ad02f7 70
phungductung 0:aa3fc5ad02f7 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:aa3fc5ad02f7 72 {
phungductung 0:aa3fc5ad02f7 73 if (spi_active(&_spi)) {
phungductung 0:aa3fc5ad02f7 74 return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event);
phungductung 0:aa3fc5ad02f7 75 }
phungductung 0:aa3fc5ad02f7 76 start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event);
phungductung 0:aa3fc5ad02f7 77 return 0;
phungductung 0:aa3fc5ad02f7 78 }
phungductung 0:aa3fc5ad02f7 79
phungductung 0:aa3fc5ad02f7 80 void SPI::abort_transfer()
phungductung 0:aa3fc5ad02f7 81 {
phungductung 0:aa3fc5ad02f7 82 spi_abort_asynch(&_spi);
phungductung 0:aa3fc5ad02f7 83 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:aa3fc5ad02f7 84 dequeue_transaction();
phungductung 0:aa3fc5ad02f7 85 #endif
phungductung 0:aa3fc5ad02f7 86 }
phungductung 0:aa3fc5ad02f7 87
phungductung 0:aa3fc5ad02f7 88
phungductung 0:aa3fc5ad02f7 89 void SPI::clear_transfer_buffer()
phungductung 0:aa3fc5ad02f7 90 {
phungductung 0:aa3fc5ad02f7 91 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:aa3fc5ad02f7 92 _transaction_buffer.reset();
phungductung 0:aa3fc5ad02f7 93 #endif
phungductung 0:aa3fc5ad02f7 94 }
phungductung 0:aa3fc5ad02f7 95
phungductung 0:aa3fc5ad02f7 96 void SPI::abort_all_transfers()
phungductung 0:aa3fc5ad02f7 97 {
phungductung 0:aa3fc5ad02f7 98 clear_transfer_buffer();
phungductung 0:aa3fc5ad02f7 99 abort_transfer();
phungductung 0:aa3fc5ad02f7 100 }
phungductung 0:aa3fc5ad02f7 101
phungductung 0:aa3fc5ad02f7 102 int SPI::set_dma_usage(DMAUsage usage)
phungductung 0:aa3fc5ad02f7 103 {
phungductung 0:aa3fc5ad02f7 104 if (spi_active(&_spi)) {
phungductung 0:aa3fc5ad02f7 105 return -1;
phungductung 0:aa3fc5ad02f7 106 }
phungductung 0:aa3fc5ad02f7 107 _usage = usage;
phungductung 0:aa3fc5ad02f7 108 return 0;
phungductung 0:aa3fc5ad02f7 109 }
phungductung 0:aa3fc5ad02f7 110
phungductung 0:aa3fc5ad02f7 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:aa3fc5ad02f7 112 {
phungductung 0:aa3fc5ad02f7 113 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:aa3fc5ad02f7 114 transaction_t t;
phungductung 0:aa3fc5ad02f7 115
phungductung 0:aa3fc5ad02f7 116 t.tx_buffer = const_cast<void *>(tx_buffer);
phungductung 0:aa3fc5ad02f7 117 t.tx_length = tx_length;
phungductung 0:aa3fc5ad02f7 118 t.rx_buffer = rx_buffer;
phungductung 0:aa3fc5ad02f7 119 t.rx_length = rx_length;
phungductung 0:aa3fc5ad02f7 120 t.event = event;
phungductung 0:aa3fc5ad02f7 121 t.callback = callback;
phungductung 0:aa3fc5ad02f7 122 t.width = bit_width;
phungductung 0:aa3fc5ad02f7 123 Transaction<SPI> transaction(this, t);
phungductung 0:aa3fc5ad02f7 124 if (_transaction_buffer.full()) {
phungductung 0:aa3fc5ad02f7 125 return -1; // the buffer is full
phungductung 0:aa3fc5ad02f7 126 } else {
phungductung 0:aa3fc5ad02f7 127 __disable_irq();
phungductung 0:aa3fc5ad02f7 128 _transaction_buffer.push(transaction);
phungductung 0:aa3fc5ad02f7 129 if (!spi_active(&_spi)) {
phungductung 0:aa3fc5ad02f7 130 dequeue_transaction();
phungductung 0:aa3fc5ad02f7 131 }
phungductung 0:aa3fc5ad02f7 132 __enable_irq();
phungductung 0:aa3fc5ad02f7 133 return 0;
phungductung 0:aa3fc5ad02f7 134 }
phungductung 0:aa3fc5ad02f7 135 #else
phungductung 0:aa3fc5ad02f7 136 return -1;
phungductung 0:aa3fc5ad02f7 137 #endif
phungductung 0:aa3fc5ad02f7 138 }
phungductung 0:aa3fc5ad02f7 139
phungductung 0:aa3fc5ad02f7 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:aa3fc5ad02f7 141 {
phungductung 0:aa3fc5ad02f7 142 aquire();
phungductung 0:aa3fc5ad02f7 143 _callback = callback;
phungductung 0:aa3fc5ad02f7 144 _irq.callback(&SPI::irq_handler_asynch);
phungductung 0:aa3fc5ad02f7 145 spi_master_transfer(&_spi, tx_buffer, tx_length, rx_buffer, rx_length, bit_width, _irq.entry(), event , _usage);
phungductung 0:aa3fc5ad02f7 146 }
phungductung 0:aa3fc5ad02f7 147
phungductung 0:aa3fc5ad02f7 148 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:aa3fc5ad02f7 149
phungductung 0:aa3fc5ad02f7 150 void SPI::start_transaction(transaction_t *data)
phungductung 0:aa3fc5ad02f7 151 {
phungductung 0:aa3fc5ad02f7 152 start_transfer(data->tx_buffer, data->tx_length, data->rx_buffer, data->rx_length, data->width, data->callback, data->event);
phungductung 0:aa3fc5ad02f7 153 }
phungductung 0:aa3fc5ad02f7 154
phungductung 0:aa3fc5ad02f7 155 void SPI::dequeue_transaction()
phungductung 0:aa3fc5ad02f7 156 {
phungductung 0:aa3fc5ad02f7 157 Transaction<SPI> t;
phungductung 0:aa3fc5ad02f7 158 if (_transaction_buffer.pop(t)) {
phungductung 0:aa3fc5ad02f7 159 SPI* obj = t.get_object();
phungductung 0:aa3fc5ad02f7 160 transaction_t* data = t.get_transaction();
phungductung 0:aa3fc5ad02f7 161 obj->start_transaction(data);
phungductung 0:aa3fc5ad02f7 162 }
phungductung 0:aa3fc5ad02f7 163 }
phungductung 0:aa3fc5ad02f7 164
phungductung 0:aa3fc5ad02f7 165 #endif
phungductung 0:aa3fc5ad02f7 166
phungductung 0:aa3fc5ad02f7 167 void SPI::irq_handler_asynch(void)
phungductung 0:aa3fc5ad02f7 168 {
phungductung 0:aa3fc5ad02f7 169 int event = spi_irq_handler_asynch(&_spi);
phungductung 0:aa3fc5ad02f7 170 if (_callback && (event & SPI_EVENT_ALL)) {
phungductung 0:aa3fc5ad02f7 171 _callback.call(event & SPI_EVENT_ALL);
phungductung 0:aa3fc5ad02f7 172 }
phungductung 0:aa3fc5ad02f7 173 #if TRANSACTION_QUEUE_SIZE_SPI
phungductung 0:aa3fc5ad02f7 174 if (event & (SPI_EVENT_ALL | SPI_EVENT_INTERNAL_TRANSFER_COMPLETE)) {
phungductung 0:aa3fc5ad02f7 175 // SPI peripheral is free (event happend), dequeue transaction
phungductung 0:aa3fc5ad02f7 176 dequeue_transaction();
phungductung 0:aa3fc5ad02f7 177 }
phungductung 0:aa3fc5ad02f7 178 #endif
phungductung 0:aa3fc5ad02f7 179 }
phungductung 0:aa3fc5ad02f7 180
phungductung 0:aa3fc5ad02f7 181 #endif
phungductung 0:aa3fc5ad02f7 182
phungductung 0:aa3fc5ad02f7 183 } // namespace mbed
phungductung 0:aa3fc5ad02f7 184
phungductung 0:aa3fc5ad02f7 185 #endif