spinal cord / PokittoLib_

PokittoLib is the library needed for programming the Pokitto DIY game console (www.pokitto.com)

mbed-pokitto/common/SPI.cpp@5:ea7377f3d1af, 2017-10-11 (annotated)

Committer:
Pokitto
Date:
Wed Oct 11 20:35:27 2017 +0000
Revision:
5:ea7377f3d1af
Fixed PokittoLib. Includes a working custom mbed-src

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Pokitto 5:ea7377f3d1af 1 /* mbed Microcontroller Library
Pokitto 5:ea7377f3d1af 2 * Copyright (c) 2006-2013 ARM Limited
Pokitto 5:ea7377f3d1af 3 *
Pokitto 5:ea7377f3d1af 4 * Licensed under the Apache License, Version 2.0 (the "License");
Pokitto 5:ea7377f3d1af 5 * you may not use this file except in compliance with the License.
Pokitto 5:ea7377f3d1af 6 * You may obtain a copy of the License at
Pokitto 5:ea7377f3d1af 7 *
Pokitto 5:ea7377f3d1af 8 * http://www.apache.org/licenses/LICENSE-2.0
Pokitto 5:ea7377f3d1af 9 *
Pokitto 5:ea7377f3d1af 10 * Unless required by applicable law or agreed to in writing, software
Pokitto 5:ea7377f3d1af 11 * distributed under the License is distributed on an "AS IS" BASIS,
Pokitto 5:ea7377f3d1af 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Pokitto 5:ea7377f3d1af 13 * See the License for the specific language governing permissions and
Pokitto 5:ea7377f3d1af 14 * limitations under the License.
Pokitto 5:ea7377f3d1af 15 */
Pokitto 5:ea7377f3d1af 16 #include "SPI.h"
Pokitto 5:ea7377f3d1af 17
Pokitto 5:ea7377f3d1af 18 #if DEVICE_SPI
Pokitto 5:ea7377f3d1af 19
Pokitto 5:ea7377f3d1af 20 namespace mbed {
Pokitto 5:ea7377f3d1af 21
Pokitto 5:ea7377f3d1af 22 #if DEVICE_SPI_ASYNCH && TRANSACTION_QUEUE_SIZE_SPI
Pokitto 5:ea7377f3d1af 23 CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> SPI::_transaction_buffer;
Pokitto 5:ea7377f3d1af 24 #endif
Pokitto 5:ea7377f3d1af 25
Pokitto 5:ea7377f3d1af 26 SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName ssel) :
Pokitto 5:ea7377f3d1af 27 _spi(),
Pokitto 5:ea7377f3d1af 28 #if DEVICE_SPI_ASYNCH
Pokitto 5:ea7377f3d1af 29 _irq(this),
Pokitto 5:ea7377f3d1af 30 _usage(DMA_USAGE_NEVER),
Pokitto 5:ea7377f3d1af 31 #endif
Pokitto 5:ea7377f3d1af 32 _bits(8),
Pokitto 5:ea7377f3d1af 33 _mode(0),
Pokitto 5:ea7377f3d1af 34 _hz(1000000) {
Pokitto 5:ea7377f3d1af 35 spi_init(&_spi, mosi, miso, sclk, ssel);
Pokitto 5:ea7377f3d1af 36 spi_format(&_spi, _bits, _mode, 0);
Pokitto 5:ea7377f3d1af 37 spi_frequency(&_spi, _hz);
Pokitto 5:ea7377f3d1af 38 }
Pokitto 5:ea7377f3d1af 39
Pokitto 5:ea7377f3d1af 40 void SPI::format(int bits, int mode) {
Pokitto 5:ea7377f3d1af 41 _bits = bits;
Pokitto 5:ea7377f3d1af 42 _mode = mode;
Pokitto 5:ea7377f3d1af 43 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
Pokitto 5:ea7377f3d1af 44 aquire();
Pokitto 5:ea7377f3d1af 45 }
Pokitto 5:ea7377f3d1af 46
Pokitto 5:ea7377f3d1af 47 void SPI::frequency(int hz) {
Pokitto 5:ea7377f3d1af 48 _hz = hz;
Pokitto 5:ea7377f3d1af 49 SPI::_owner = NULL; // Not that elegant, but works. rmeyer
Pokitto 5:ea7377f3d1af 50 aquire();
Pokitto 5:ea7377f3d1af 51 }
Pokitto 5:ea7377f3d1af 52
Pokitto 5:ea7377f3d1af 53 SPI* SPI::_owner = NULL;
Pokitto 5:ea7377f3d1af 54
Pokitto 5:ea7377f3d1af 55 // ignore the fact there are multiple physical spis, and always update if it wasnt us last
Pokitto 5:ea7377f3d1af 56 void SPI::aquire() {
Pokitto 5:ea7377f3d1af 57 if (_owner != this) {
Pokitto 5:ea7377f3d1af 58 spi_format(&_spi, _bits, _mode, 0);
Pokitto 5:ea7377f3d1af 59 spi_frequency(&_spi, _hz);
Pokitto 5:ea7377f3d1af 60 _owner = this;
Pokitto 5:ea7377f3d1af 61 }
Pokitto 5:ea7377f3d1af 62 }
Pokitto 5:ea7377f3d1af 63
Pokitto 5:ea7377f3d1af 64 int SPI::write(int value) {
Pokitto 5:ea7377f3d1af 65 aquire();
Pokitto 5:ea7377f3d1af 66 return spi_master_write(&_spi, value);
Pokitto 5:ea7377f3d1af 67 }
Pokitto 5:ea7377f3d1af 68
Pokitto 5:ea7377f3d1af 69 #if DEVICE_SPI_ASYNCH
Pokitto 5:ea7377f3d1af 70
Pokitto 5:ea7377f3d1af 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)
Pokitto 5:ea7377f3d1af 72 {
Pokitto 5:ea7377f3d1af 73 if (spi_active(&_spi)) {
Pokitto 5:ea7377f3d1af 74 return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event);
Pokitto 5:ea7377f3d1af 75 }
Pokitto 5:ea7377f3d1af 76 start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, bit_width, callback, event);
Pokitto 5:ea7377f3d1af 77 return 0;
Pokitto 5:ea7377f3d1af 78 }
Pokitto 5:ea7377f3d1af 79
Pokitto 5:ea7377f3d1af 80 void SPI::abort_transfer()
Pokitto 5:ea7377f3d1af 81 {
Pokitto 5:ea7377f3d1af 82 spi_abort_asynch(&_spi);
Pokitto 5:ea7377f3d1af 83 #if TRANSACTION_QUEUE_SIZE_SPI
Pokitto 5:ea7377f3d1af 84 dequeue_transaction();
Pokitto 5:ea7377f3d1af 85 #endif
Pokitto 5:ea7377f3d1af 86 }
Pokitto 5:ea7377f3d1af 87
Pokitto 5:ea7377f3d1af 88
Pokitto 5:ea7377f3d1af 89 void SPI::clear_transfer_buffer()
Pokitto 5:ea7377f3d1af 90 {
Pokitto 5:ea7377f3d1af 91 #if TRANSACTION_QUEUE_SIZE_SPI
Pokitto 5:ea7377f3d1af 92 _transaction_buffer.reset();
Pokitto 5:ea7377f3d1af 93 #endif
Pokitto 5:ea7377f3d1af 94 }
Pokitto 5:ea7377f3d1af 95
Pokitto 5:ea7377f3d1af 96 void SPI::abort_all_transfers()
Pokitto 5:ea7377f3d1af 97 {
Pokitto 5:ea7377f3d1af 98 clear_transfer_buffer();
Pokitto 5:ea7377f3d1af 99 abort_transfer();
Pokitto 5:ea7377f3d1af 100 }
Pokitto 5:ea7377f3d1af 101
Pokitto 5:ea7377f3d1af 102 int SPI::set_dma_usage(DMAUsage usage)
Pokitto 5:ea7377f3d1af 103 {
Pokitto 5:ea7377f3d1af 104 if (spi_active(&_spi)) {
Pokitto 5:ea7377f3d1af 105 return -1;
Pokitto 5:ea7377f3d1af 106 }
Pokitto 5:ea7377f3d1af 107 _usage = usage;
Pokitto 5:ea7377f3d1af 108 return 0;
Pokitto 5:ea7377f3d1af 109 }
Pokitto 5:ea7377f3d1af 110
Pokitto 5:ea7377f3d1af 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)
Pokitto 5:ea7377f3d1af 112 {
Pokitto 5:ea7377f3d1af 113 #if TRANSACTION_QUEUE_SIZE_SPI
Pokitto 5:ea7377f3d1af 114 transaction_t t;
Pokitto 5:ea7377f3d1af 115
Pokitto 5:ea7377f3d1af 116 t.tx_buffer = const_cast<void *>(tx_buffer);
Pokitto 5:ea7377f3d1af 117 t.tx_length = tx_length;
Pokitto 5:ea7377f3d1af 118 t.rx_buffer = rx_buffer;
Pokitto 5:ea7377f3d1af 119 t.rx_length = rx_length;
Pokitto 5:ea7377f3d1af 120 t.event = event;
Pokitto 5:ea7377f3d1af 121 t.callback = callback;
Pokitto 5:ea7377f3d1af 122 t.width = bit_width;
Pokitto 5:ea7377f3d1af 123 Transaction<SPI> transaction(this, t);
Pokitto 5:ea7377f3d1af 124 if (_transaction_buffer.full()) {
Pokitto 5:ea7377f3d1af 125 return -1; // the buffer is full
Pokitto 5:ea7377f3d1af 126 } else {
Pokitto 5:ea7377f3d1af 127 _transaction_buffer.push(transaction);
Pokitto 5:ea7377f3d1af 128 return 0;
Pokitto 5:ea7377f3d1af 129 }
Pokitto 5:ea7377f3d1af 130 #else
Pokitto 5:ea7377f3d1af 131 return -1;
Pokitto 5:ea7377f3d1af 132 #endif
Pokitto 5:ea7377f3d1af 133 }
Pokitto 5:ea7377f3d1af 134
Pokitto 5:ea7377f3d1af 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)
Pokitto 5:ea7377f3d1af 136 {
Pokitto 5:ea7377f3d1af 137 aquire();
Pokitto 5:ea7377f3d1af 138 _callback = callback;
Pokitto 5:ea7377f3d1af 139 _irq.callback(&SPI::irq_handler_asynch);
Pokitto 5:ea7377f3d1af 140 spi_master_transfer(&_spi, tx_buffer, tx_length, rx_buffer, rx_length, bit_width, _irq.entry(), event , _usage);
Pokitto 5:ea7377f3d1af 141 }
Pokitto 5:ea7377f3d1af 142
Pokitto 5:ea7377f3d1af 143 #if TRANSACTION_QUEUE_SIZE_SPI
Pokitto 5:ea7377f3d1af 144
Pokitto 5:ea7377f3d1af 145 void SPI::start_transaction(transaction_t *data)
Pokitto 5:ea7377f3d1af 146 {
Pokitto 5:ea7377f3d1af 147 start_transfer(data->tx_buffer, data->tx_length, data->rx_buffer, data->rx_length, data->width, data->callback, data->event);
Pokitto 5:ea7377f3d1af 148 }
Pokitto 5:ea7377f3d1af 149
Pokitto 5:ea7377f3d1af 150 void SPI::dequeue_transaction()
Pokitto 5:ea7377f3d1af 151 {
Pokitto 5:ea7377f3d1af 152 Transaction<SPI> t;
Pokitto 5:ea7377f3d1af 153 if (_transaction_buffer.pop(t)) {
Pokitto 5:ea7377f3d1af 154 SPI* obj = t.get_object();
Pokitto 5:ea7377f3d1af 155 transaction_t* data = t.get_transaction();
Pokitto 5:ea7377f3d1af 156 obj->start_transaction(data);
Pokitto 5:ea7377f3d1af 157 }
Pokitto 5:ea7377f3d1af 158 }
Pokitto 5:ea7377f3d1af 159
Pokitto 5:ea7377f3d1af 160 #endif
Pokitto 5:ea7377f3d1af 161
Pokitto 5:ea7377f3d1af 162 void SPI::irq_handler_asynch(void)
Pokitto 5:ea7377f3d1af 163 {
Pokitto 5:ea7377f3d1af 164 int event = spi_irq_handler_asynch(&_spi);
Pokitto 5:ea7377f3d1af 165 if (_callback && (event & SPI_EVENT_ALL)) {
Pokitto 5:ea7377f3d1af 166 _callback.call(event & SPI_EVENT_ALL);
Pokitto 5:ea7377f3d1af 167 }
Pokitto 5:ea7377f3d1af 168 #if TRANSACTION_QUEUE_SIZE_SPI
Pokitto 5:ea7377f3d1af 169 if (event & (SPI_EVENT_ALL | SPI_EVENT_INTERNAL_TRANSFER_COMPLETE)) {
Pokitto 5:ea7377f3d1af 170 // SPI peripheral is free (event happend), dequeue transaction
Pokitto 5:ea7377f3d1af 171 dequeue_transaction();
Pokitto 5:ea7377f3d1af 172 }
Pokitto 5:ea7377f3d1af 173 #endif
Pokitto 5:ea7377f3d1af 174 }
Pokitto 5:ea7377f3d1af 175
Pokitto 5:ea7377f3d1af 176 #endif
Pokitto 5:ea7377f3d1af 177
Pokitto 5:ea7377f3d1af 178 } // namespace mbed
Pokitto 5:ea7377f3d1af 179
Pokitto 5:ea7377f3d1af 180 #endif