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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

common/SPI.cpp@635:a11c0372f0ba, 2015-09-30 (annotated)

Committer:
mbed_official
Date:
Wed Sep 30 17:00:09 2015 +0100
Revision:
635:a11c0372f0ba
Parent:
563:536c9fb088a0 
Synchronized with git revision d29c98dae61be0946ddf3a3c641c7726056f9452



Full URL: https://github.com/mbedmicro/mbed/commit/d29c98dae61be0946ddf3a3c641c7726056f9452/



Added support for SAMW25

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 13:0645d8841f51 1 /* mbed Microcontroller Library
bogdanm 13:0645d8841f51 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 13:0645d8841f51 3 *
bogdanm 13:0645d8841f51 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 13:0645d8841f51 5 * you may not use this file except in compliance with the License.
bogdanm 13:0645d8841f51 6 * You may obtain a copy of the License at
bogdanm 13:0645d8841f51 7 *
bogdanm 13:0645d8841f51 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 13:0645d8841f51 9 *
bogdanm 13:0645d8841f51 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 13:0645d8841f51 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 13:0645d8841f51 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 13:0645d8841f51 13 * See the License for the specific language governing permissions and
bogdanm 13:0645d8841f51 14 * limitations under the License.
bogdanm 13:0645d8841f51 15 */
bogdanm 13:0645d8841f51 16 #include "SPI.h"
bogdanm 13:0645d8841f51 17
bogdanm 13:0645d8841f51 18 #if DEVICE_SPI
bogdanm 13:0645d8841f51 19
bogdanm 13:0645d8841f51 20 namespace mbed {
bogdanm 13:0645d8841f51 21
mbed_official 525:c320967f86b9 22 #if DEVICE_SPI_ASYNCH && TRANSACTION_QUEUE_SIZE_SPI
mbed_official 525:c320967f86b9 23 CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> SPI::_transaction_buffer;
mbed_official 525:c320967f86b9 24 #endif
mbed_official 525:c320967f86b9 25
mbed_official 552:a1b9575155a3 26 SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName ssel) :
mbed_official 212:34d62c0b2af6 27 _spi(),
mbed_official 525:c320967f86b9 28 #if DEVICE_SPI_ASYNCH
mbed_official 525:c320967f86b9 29 _irq(this),
mbed_official 525:c320967f86b9 30 _usage(DMA_USAGE_NEVER),
mbed_official 525:c320967f86b9 31 #endif
mbed_official 212:34d62c0b2af6 32 _bits(8),
mbed_official 212:34d62c0b2af6 33 _mode(0),
mbed_official 212:34d62c0b2af6 34 _hz(1000000) {
mbed_official 552:a1b9575155a3 35 spi_init(&_spi, mosi, miso, sclk, ssel);
bogdanm 13:0645d8841f51 36 spi_format(&_spi, _bits, _mode, 0);
bogdanm 13:0645d8841f51 37 spi_frequency(&_spi, _hz);
bogdanm 13:0645d8841f51 38 }
bogdanm 13:0645d8841f51 39
bogdanm 13:0645d8841f51 40 void SPI::format(int bits, int mode) {
bogdanm 13:0645d8841f51 41 _bits = bits;
bogdanm 13:0645d8841f51 42 _mode = mode;
bogdanm 13:0645d8841f51 43 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
bogdanm 13:0645d8841f51 44 aquire();
bogdanm 13:0645d8841f51 45 }
bogdanm 13:0645d8841f51 46
bogdanm 13:0645d8841f51 47 void SPI::frequency(int hz) {
bogdanm 13:0645d8841f51 48 _hz = hz;
bogdanm 13:0645d8841f51 49 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
bogdanm 13:0645d8841f51 50 aquire();
bogdanm 13:0645d8841f51 51 }
bogdanm 13:0645d8841f51 52
bogdanm 13:0645d8841f51 53 SPI* SPI::_owner = NULL;
bogdanm 13:0645d8841f51 54
bogdanm 13:0645d8841f51 55 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
bogdanm 13:0645d8841f51 56 void SPI::aquire() {
bogdanm 13:0645d8841f51 57 if (_owner != this) {
bogdanm 13:0645d8841f51 58 spi_format(&_spi, _bits, _mode, 0);
bogdanm 13:0645d8841f51 59 spi_frequency(&_spi, _hz);
bogdanm 13:0645d8841f51 60 _owner = this;
bogdanm 13:0645d8841f51 61 }
bogdanm 13:0645d8841f51 62 }
bogdanm 13:0645d8841f51 63
bogdanm 13:0645d8841f51 64 int SPI::write(int value) {
bogdanm 13:0645d8841f51 65 aquire();
bogdanm 13:0645d8841f51 66 return spi_master_write(&_spi, value);
bogdanm 13:0645d8841f51 67 }
bogdanm 13:0645d8841f51 68
mbed_official 525:c320967f86b9 69 #if DEVICE_SPI_ASYNCH
mbed_official 525:c320967f86b9 70
mbed_official 563:536c9fb088a0 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)
mbed_official 525:c320967f86b9 72 {
mbed_official 525:c320967f86b9 73 if (spi_active(&_spi)) {
mbed_official 525:c320967f86b9 74 return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event);
mbed_official 525:c320967f86b9 75 }
mbed_official 525:c320967f86b9 76 start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event);
mbed_official 525:c320967f86b9 77 return 0;
mbed_official 525:c320967f86b9 78 }
mbed_official 525:c320967f86b9 79
mbed_official 525:c320967f86b9 80 void SPI::abort_transfer()
mbed_official 525:c320967f86b9 81 {
mbed_official 525:c320967f86b9 82 spi_abort_asynch(&_spi);
mbed_official 525:c320967f86b9 83 #if TRANSACTION_QUEUE_SIZE_SPI
mbed_official 525:c320967f86b9 84 dequeue_transaction();
mbed_official 525:c320967f86b9 85 #endif
mbed_official 525:c320967f86b9 86 }
mbed_official 525:c320967f86b9 87
mbed_official 525:c320967f86b9 88
mbed_official 525:c320967f86b9 89 void SPI::clear_transfer_buffer()
mbed_official 525:c320967f86b9 90 {
mbed_official 525:c320967f86b9 91 #if TRANSACTION_QUEUE_SIZE_SPI
mbed_official 525:c320967f86b9 92 _transaction_buffer.reset();
mbed_official 525:c320967f86b9 93 #endif
mbed_official 525:c320967f86b9 94 }
mbed_official 525:c320967f86b9 95
mbed_official 525:c320967f86b9 96 void SPI::abort_all_transfers()
mbed_official 525:c320967f86b9 97 {
mbed_official 525:c320967f86b9 98 clear_transfer_buffer();
mbed_official 525:c320967f86b9 99 abort_transfer();
mbed_official 525:c320967f86b9 100 }
mbed_official 525:c320967f86b9 101
mbed_official 525:c320967f86b9 102 int SPI::set_dma_usage(DMAUsage usage)
mbed_official 525:c320967f86b9 103 {
mbed_official 525:c320967f86b9 104 if (spi_active(&_spi)) {
mbed_official 525:c320967f86b9 105 return -1;
mbed_official 525:c320967f86b9 106 }
mbed_official 525:c320967f86b9 107 _usage = usage;
mbed_official 525:c320967f86b9 108 return 0;
mbed_official 525:c320967f86b9 109 }
mbed_official 525:c320967f86b9 110
mbed_official 563:536c9fb088a0 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)
mbed_official 525:c320967f86b9 112 {
mbed_official 525:c320967f86b9 113 #if TRANSACTION_QUEUE_SIZE_SPI
mbed_official 525:c320967f86b9 114 transaction_t t;
mbed_official 525:c320967f86b9 115
mbed_official 563:536c9fb088a0 116 t.tx_buffer = const_cast<void *>(tx_buffer);
mbed_official 525:c320967f86b9 117 t.tx_length = tx_length;
mbed_official 525:c320967f86b9 118 t.rx_buffer = rx_buffer;
mbed_official 525:c320967f86b9 119 t.rx_length = rx_length;
mbed_official 525:c320967f86b9 120 t.event = event;
mbed_official 525:c320967f86b9 121 t.callback = callback;
mbed_official 525:c320967f86b9 122 t.width = bit_width;
mbed_official 525:c320967f86b9 123 Transaction<SPI> transaction(this, t);
mbed_official 525:c320967f86b9 124 if (_transaction_buffer.full()) {
mbed_official 525:c320967f86b9 125 return -1; // the buffer is full
mbed_official 525:c320967f86b9 126 } else {
mbed_official 525:c320967f86b9 127 _transaction_buffer.push(transaction);
mbed_official 525:c320967f86b9 128 return 0;
mbed_official 525:c320967f86b9 129 }
mbed_official 525:c320967f86b9 130 #else
mbed_official 525:c320967f86b9 131 return -1;
mbed_official 525:c320967f86b9 132 #endif
mbed_official 525:c320967f86b9 133 }
mbed_official 525:c320967f86b9 134
mbed_official 563:536c9fb088a0 135 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)
mbed_official 525:c320967f86b9 136 {
mbed_official 525:c320967f86b9 137 aquire();
mbed_official 525:c320967f86b9 138 _callback = callback;
mbed_official 525:c320967f86b9 139 _irq.callback(&SPI::irq_handler_asynch);
mbed_official 525:c320967f86b9 140 spi_master_transfer(&_spi, tx_buffer, tx_length, rx_buffer, rx_length, bit_width, _irq.entry(), event , _usage);
mbed_official 525:c320967f86b9 141 }
mbed_official 525:c320967f86b9 142
mbed_official 525:c320967f86b9 143 #if TRANSACTION_QUEUE_SIZE_SPI
mbed_official 525:c320967f86b9 144
mbed_official 525:c320967f86b9 145 void SPI::start_transaction(transaction_t *data)
mbed_official 525:c320967f86b9 146 {
mbed_official 525:c320967f86b9 147 start_transfer(data->tx_buffer, data->tx_length, data->rx_buffer, data->rx_length, data->width, data->callback, data->event);
mbed_official 525:c320967f86b9 148 }
mbed_official 525:c320967f86b9 149
mbed_official 525:c320967f86b9 150 void SPI::dequeue_transaction()
mbed_official 525:c320967f86b9 151 {
mbed_official 525:c320967f86b9 152 Transaction<SPI> t;
mbed_official 525:c320967f86b9 153 if (_transaction_buffer.pop(t)) {
mbed_official 525:c320967f86b9 154 SPI* obj = t.get_object();
mbed_official 525:c320967f86b9 155 transaction_t* data = t.get_transaction();
mbed_official 525:c320967f86b9 156 obj->start_transaction(data);
mbed_official 525:c320967f86b9 157 }
mbed_official 525:c320967f86b9 158 }
mbed_official 525:c320967f86b9 159
mbed_official 525:c320967f86b9 160 #endif
mbed_official 525:c320967f86b9 161
mbed_official 525:c320967f86b9 162 void SPI::irq_handler_asynch(void)
mbed_official 525:c320967f86b9 163 {
mbed_official 525:c320967f86b9 164 int event = spi_irq_handler_asynch(&_spi);
mbed_official 525:c320967f86b9 165 if (_callback && (event & SPI_EVENT_ALL)) {
mbed_official 525:c320967f86b9 166 _callback.call(event & SPI_EVENT_ALL);
mbed_official 525:c320967f86b9 167 }
mbed_official 525:c320967f86b9 168 #if TRANSACTION_QUEUE_SIZE_SPI
mbed_official 525:c320967f86b9 169 if (event & (SPI_EVENT_ALL | SPI_EVENT_INTERNAL_TRANSFER_COMPLETE)) {
mbed_official 525:c320967f86b9 170 // SPI peripheral is free (event happend), dequeue transaction
mbed_official 525:c320967f86b9 171 dequeue_transaction();
mbed_official 525:c320967f86b9 172 }
mbed_official 525:c320967f86b9 173 #endif
mbed_official 525:c320967f86b9 174 }
mbed_official 525:c320967f86b9 175
mbed_official 525:c320967f86b9 176 #endif
mbed_official 525:c320967f86b9 177
bogdanm 13:0645d8841f51 178 } // namespace mbed
bogdanm 13:0645d8841f51 179
bogdanm 13:0645d8841f51 180 #endif