Vergil Cola / cc3000_hostdriver_mbedsocket

Added mutex for multiple SPI devices on the same SPI bus

Fork of cc3000_hostdriver_mbedsocket by Martin Kojtal

cc3000_spi.cpp@47:cc9a2501e29f, 2014-10-16 (annotated)

Committer:
vpcola
Date:
Thu Oct 16 13:39:08 2014 +0000
Revision:
47:cc9a2501e29f
Parent:
45:50ab13d8f2dc 
Added mutex if used in rtos

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Kojto 20:30b6ed7bf8fd 1 /*****************************************************************************
Kojto 20:30b6ed7bf8fd 2 *
Kojto 20:30b6ed7bf8fd 3 * C++ interface/implementation created by Martin Kojtal (0xc0170). Thanks to
Kojto 20:30b6ed7bf8fd 4 * Jim Carver and Frank Vannieuwkerke for their inital cc3000 mbed port and
Kojto 20:30b6ed7bf8fd 5 * provided help.
Kojto 20:30b6ed7bf8fd 6 *
Kojto 20:30b6ed7bf8fd 7 * This version of "host driver" uses CC3000 Host Driver Implementation. Thus
Kojto 20:30b6ed7bf8fd 8 * read the following copyright:
Kojto 20:30b6ed7bf8fd 9 *
Kojto 20:30b6ed7bf8fd 10 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
Kojto 20:30b6ed7bf8fd 11 *
Kojto 20:30b6ed7bf8fd 12 * Redistribution and use in source and binary forms, with or without
Kojto 20:30b6ed7bf8fd 13 * modification, are permitted provided that the following conditions
Kojto 20:30b6ed7bf8fd 14 * are met:
Kojto 20:30b6ed7bf8fd 15 *
Kojto 20:30b6ed7bf8fd 16 * Redistributions of source code must retain the above copyright
Kojto 20:30b6ed7bf8fd 17 * notice, this list of conditions and the following disclaimer.
Kojto 20:30b6ed7bf8fd 18 *
Kojto 20:30b6ed7bf8fd 19 * Redistributions in binary form must reproduce the above copyright
Kojto 20:30b6ed7bf8fd 20 * notice, this list of conditions and the following disclaimer in the
Kojto 20:30b6ed7bf8fd 21 * documentation and/or other materials provided with the
Kojto 20:30b6ed7bf8fd 22 * distribution.
Kojto 20:30b6ed7bf8fd 23 *
Kojto 20:30b6ed7bf8fd 24 * Neither the name of Texas Instruments Incorporated nor the names of
Kojto 20:30b6ed7bf8fd 25 * its contributors may be used to endorse or promote products derived
Kojto 20:30b6ed7bf8fd 26 * from this software without specific prior written permission.
Kojto 20:30b6ed7bf8fd 27 *
Kojto 20:30b6ed7bf8fd 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
Kojto 20:30b6ed7bf8fd 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
Kojto 20:30b6ed7bf8fd 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
Kojto 20:30b6ed7bf8fd 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
Kojto 20:30b6ed7bf8fd 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
Kojto 20:30b6ed7bf8fd 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
Kojto 20:30b6ed7bf8fd 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
Kojto 20:30b6ed7bf8fd 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
Kojto 20:30b6ed7bf8fd 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
Kojto 20:30b6ed7bf8fd 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
Kojto 20:30b6ed7bf8fd 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Kojto 20:30b6ed7bf8fd 39 *
Kojto 20:30b6ed7bf8fd 40 *****************************************************************************/
Kojto 20:30b6ed7bf8fd 41 #include "cc3000.h"
Kojto 20:30b6ed7bf8fd 42 #include "cc3000_spi.h"
Kojto 20:30b6ed7bf8fd 43
Kojto 20:30b6ed7bf8fd 44 namespace mbed_cc3000 {
Kojto 20:30b6ed7bf8fd 45
vpcola 47:cc9a2501e29f 46 cc3000_spi::cc3000_spi(PinName cc3000_irq, PinName cc3000_en, PinName cc3000_cs, SPI cc3000_spi, Mutex & mutex, cc3000_event &event, cc3000_simple_link &simple_link)
vpcola 47:cc9a2501e29f 47 : _wlan_irq(cc3000_irq), _wlan_en(cc3000_en), _wlan_cs(cc3000_cs), _wlan_spi(cc3000_spi), _mutex(mutex), _event(event), _simple_link(simple_link) {
Kojto 20:30b6ed7bf8fd 48
Kojto 20:30b6ed7bf8fd 49 _wlan_spi.format(8,1);
Kojto 20:30b6ed7bf8fd 50 _wlan_spi.frequency(12000000);
Kojto 45:50ab13d8f2dc 51 _wlan_irq.fall(this, &cc3000_spi::WLAN_IRQHandler);
Kojto 20:30b6ed7bf8fd 52
Kojto 20:30b6ed7bf8fd 53 _wlan_en = 0;
Kojto 20:30b6ed7bf8fd 54 _wlan_cs = 1;
Kojto 45:50ab13d8f2dc 55 wait_ms(50); /* mbed board delay */
Kojto 20:30b6ed7bf8fd 56 }
Kojto 20:30b6ed7bf8fd 57
Kojto 20:30b6ed7bf8fd 58 cc3000_spi::~cc3000_spi() {
Kojto 20:30b6ed7bf8fd 59
Kojto 20:30b6ed7bf8fd 60 }
Kojto 20:30b6ed7bf8fd 61
Kojto 20:30b6ed7bf8fd 62 void cc3000_spi::wlan_irq_enable()
Kojto 20:30b6ed7bf8fd 63 {
Kojto 45:50ab13d8f2dc 64 _process_irq = true;
Kojto 45:50ab13d8f2dc 65 //_wlan_irq.enable_irq();
Kojto 44:960b73df5981 66
Kojto 45:50ab13d8f2dc 67 if (wlan_irq_read() == 0) {
Kojto 44:960b73df5981 68 WLAN_IRQHandler();
Kojto 44:960b73df5981 69 }
Kojto 20:30b6ed7bf8fd 70 }
Kojto 20:30b6ed7bf8fd 71
Kojto 20:30b6ed7bf8fd 72 void cc3000_spi::wlan_irq_disable() {
Kojto 45:50ab13d8f2dc 73 _process_irq = false;
Kojto 45:50ab13d8f2dc 74 //_wlan_irq.disable_irq();
Kojto 20:30b6ed7bf8fd 75 }
Kojto 20:30b6ed7bf8fd 76
Kojto 20:30b6ed7bf8fd 77 uint32_t cc3000_spi::wlan_irq_read() {
Kojto 20:30b6ed7bf8fd 78 return _wlan_irq.read();
Kojto 20:30b6ed7bf8fd 79 }
Kojto 20:30b6ed7bf8fd 80
Kojto 20:30b6ed7bf8fd 81 void cc3000_spi::close() {
Kojto 20:30b6ed7bf8fd 82 wlan_irq_disable();
Kojto 20:30b6ed7bf8fd 83 }
Kojto 20:30b6ed7bf8fd 84
Kojto 20:30b6ed7bf8fd 85 void cc3000_spi::open() {
Kojto 20:30b6ed7bf8fd 86 _spi_info.spi_state = eSPI_STATE_POWERUP;
Kojto 20:30b6ed7bf8fd 87 _spi_info.tx_packet_length = 0;
Kojto 20:30b6ed7bf8fd 88 _spi_info.rx_packet_length = 0;
Kojto 20:30b6ed7bf8fd 89 wlan_irq_enable();
Kojto 20:30b6ed7bf8fd 90 }
Kojto 20:30b6ed7bf8fd 91
Kojto 20:30b6ed7bf8fd 92 uint32_t cc3000_spi::first_write(uint8_t *buffer, uint16_t length) {
vpcola 47:cc9a2501e29f 93 _mutex.lock();
Kojto 20:30b6ed7bf8fd 94 _wlan_cs = 0;
Kojto 20:30b6ed7bf8fd 95 wait_us(50);
Kojto 20:30b6ed7bf8fd 96
Kojto 20:30b6ed7bf8fd 97 /* first 4 bytes of the data */
Kojto 20:30b6ed7bf8fd 98 write_synchronous(buffer, 4);
Kojto 20:30b6ed7bf8fd 99 wait_us(50);
Kojto 20:30b6ed7bf8fd 100 write_synchronous(buffer + 4, length - 4);
Kojto 20:30b6ed7bf8fd 101 _spi_info.spi_state = eSPI_STATE_IDLE;
Kojto 20:30b6ed7bf8fd 102 _wlan_cs = 1;
vpcola 47:cc9a2501e29f 103 _mutex.unlock();
vpcola 47:cc9a2501e29f 104
Kojto 20:30b6ed7bf8fd 105 return 0;
Kojto 20:30b6ed7bf8fd 106 }
Kojto 20:30b6ed7bf8fd 107
Kojto 20:30b6ed7bf8fd 108
Kojto 20:30b6ed7bf8fd 109 uint32_t cc3000_spi::write(uint8_t *buffer, uint16_t length) {
Kojto 20:30b6ed7bf8fd 110 uint8_t pad = 0;
Kojto 45:50ab13d8f2dc 111 // check the total length of the packet in order to figure out if padding is necessary
Kojto 45:50ab13d8f2dc 112 if(!(length & 0x0001)) {
Kojto 20:30b6ed7bf8fd 113 pad++;
Kojto 45:50ab13d8f2dc 114 }
Kojto 45:50ab13d8f2dc 115 buffer[0] = WRITE;
Kojto 45:50ab13d8f2dc 116 buffer[1] = HI(length + pad);
Kojto 45:50ab13d8f2dc 117 buffer[2] = LO(length + pad);
Kojto 45:50ab13d8f2dc 118 buffer[3] = 0;
Kojto 45:50ab13d8f2dc 119 buffer[4] = 0;
Kojto 20:30b6ed7bf8fd 120
Kojto 45:50ab13d8f2dc 121 length += (SPI_HEADER_SIZE + pad);
Kojto 20:30b6ed7bf8fd 122
Kojto 45:50ab13d8f2dc 123 // The magic number resides at the end of the TX/RX buffer (1 byte after the allocated size)
Kojto 45:50ab13d8f2dc 124 // If the magic number is overwitten - buffer overrun occurred - we will be stuck here forever!
Kojto 45:50ab13d8f2dc 125 uint8_t *transmit_buffer = _simple_link.get_transmit_buffer();
Kojto 45:50ab13d8f2dc 126 if (transmit_buffer[CC3000_TX_BUFFER_SIZE - 1] != CC3000_BUFFER_MAGIC_NUMBER) {
Kojto 45:50ab13d8f2dc 127 while (1);
Kojto 45:50ab13d8f2dc 128 }
Kojto 45:50ab13d8f2dc 129
Kojto 45:50ab13d8f2dc 130 if (_spi_info.spi_state == eSPI_STATE_POWERUP) {
Kojto 45:50ab13d8f2dc 131 while (_spi_info.spi_state != eSPI_STATE_INITIALIZED);
Kojto 45:50ab13d8f2dc 132 }
Kojto 20:30b6ed7bf8fd 133
Kojto 45:50ab13d8f2dc 134 if (_spi_info.spi_state == eSPI_STATE_INITIALIZED) {
Kojto 45:50ab13d8f2dc 135 // TX/RX transaction over SPI after powerup: IRQ is low - send read buffer size command
Kojto 45:50ab13d8f2dc 136 first_write(buffer, length);
Kojto 45:50ab13d8f2dc 137 } else {
Kojto 45:50ab13d8f2dc 138 // Prevent occurence of a race condition when 2 back to back packets are sent to the
Kojto 45:50ab13d8f2dc 139 // device, so the state will move to IDLE and once again to not IDLE due to IRQ
Kojto 45:50ab13d8f2dc 140 wlan_irq_disable();
Kojto 20:30b6ed7bf8fd 141
Kojto 45:50ab13d8f2dc 142 while (_spi_info.spi_state != eSPI_STATE_IDLE);
Kojto 20:30b6ed7bf8fd 143
Kojto 45:50ab13d8f2dc 144 _spi_info.spi_state = eSPI_STATE_WRITE_IRQ;
Kojto 45:50ab13d8f2dc 145 //_spi_info.pTxPacket = buffer;
Kojto 45:50ab13d8f2dc 146 _spi_info.tx_packet_length = length;
Kojto 20:30b6ed7bf8fd 147
Kojto 45:50ab13d8f2dc 148 // Assert the CS line and wait until the IRQ line is active, then initialize the write operation
vpcola 47:cc9a2501e29f 149 _mutex.lock();
Kojto 45:50ab13d8f2dc 150 _wlan_cs = 0;
Kojto 20:30b6ed7bf8fd 151
Kojto 45:50ab13d8f2dc 152 wlan_irq_enable();
Kojto 45:50ab13d8f2dc 153 }
Kojto 20:30b6ed7bf8fd 154
Kojto 45:50ab13d8f2dc 155 // Wait until the transaction ends
Kojto 45:50ab13d8f2dc 156 while (_spi_info.spi_state != eSPI_STATE_IDLE);
Kojto 20:30b6ed7bf8fd 157
Kojto 45:50ab13d8f2dc 158 return 0;
Kojto 20:30b6ed7bf8fd 159 }
Kojto 20:30b6ed7bf8fd 160
Kojto 20:30b6ed7bf8fd 161 void cc3000_spi::write_synchronous(uint8_t *data, uint16_t size) {
Kojto 45:50ab13d8f2dc 162 while(size) {
Kojto 20:30b6ed7bf8fd 163 _wlan_spi.write(*data++);
Kojto 20:30b6ed7bf8fd 164 size--;
Kojto 45:50ab13d8f2dc 165 }
Kojto 20:30b6ed7bf8fd 166 }
Kojto 20:30b6ed7bf8fd 167
Kojto 20:30b6ed7bf8fd 168 void cc3000_spi::read_synchronous(uint8_t *data, uint16_t size) {
Kojto 45:50ab13d8f2dc 169 for (uint32_t i = 0; i < size; i++) {
Kojto 45:50ab13d8f2dc 170 data[i] = _wlan_spi.write(0x03);
Kojto 45:50ab13d8f2dc 171 }
Kojto 20:30b6ed7bf8fd 172 }
Kojto 20:30b6ed7bf8fd 173
Kojto 20:30b6ed7bf8fd 174 uint32_t cc3000_spi::read_data_cont() {
Kojto 45:50ab13d8f2dc 175 int32_t data_to_recv;
Kojto 45:50ab13d8f2dc 176 uint8_t *evnt_buff, type;
Kojto 20:30b6ed7bf8fd 177
Kojto 20:30b6ed7bf8fd 178 //determine the packet type
Kojto 20:30b6ed7bf8fd 179 evnt_buff = _simple_link.get_received_buffer();
Kojto 20:30b6ed7bf8fd 180 data_to_recv = 0;
Kojto 20:30b6ed7bf8fd 181 STREAM_TO_UINT8((uint8_t *)(evnt_buff + SPI_HEADER_SIZE), HCI_PACKET_TYPE_OFFSET, type);
Kojto 20:30b6ed7bf8fd 182
Kojto 45:50ab13d8f2dc 183 switch(type) {
Kojto 20:30b6ed7bf8fd 184 case HCI_TYPE_DATA:
Kojto 45:50ab13d8f2dc 185 // Read the remaining data..
Kojto 45:50ab13d8f2dc 186 STREAM_TO_UINT16((uint8_t *)(evnt_buff + SPI_HEADER_SIZE), HCI_DATA_LENGTH_OFFSET, data_to_recv);
Kojto 45:50ab13d8f2dc 187 if (!((HEADERS_SIZE_EVNT + data_to_recv) & 1)) {
Kojto 45:50ab13d8f2dc 188 data_to_recv++;
Kojto 45:50ab13d8f2dc 189 }
Kojto 20:30b6ed7bf8fd 190
Kojto 45:50ab13d8f2dc 191 if (data_to_recv) {
Kojto 20:30b6ed7bf8fd 192 read_synchronous(evnt_buff + 10, data_to_recv);
Kojto 45:50ab13d8f2dc 193 }
Kojto 20:30b6ed7bf8fd 194 break;
Kojto 20:30b6ed7bf8fd 195 case HCI_TYPE_EVNT:
Kojto 45:50ab13d8f2dc 196 // Calculate the rest length of the data
Kojto 20:30b6ed7bf8fd 197 STREAM_TO_UINT8((char *)(evnt_buff + SPI_HEADER_SIZE), HCI_EVENT_LENGTH_OFFSET, data_to_recv);
Kojto 45:50ab13d8f2dc 198 data_to_recv -= 1;
Kojto 45:50ab13d8f2dc 199 // Add padding byte if needed
Kojto 45:50ab13d8f2dc 200 if ((HEADERS_SIZE_EVNT + data_to_recv) & 1) {
Kojto 45:50ab13d8f2dc 201 data_to_recv++;
Kojto 45:50ab13d8f2dc 202 }
Kojto 20:30b6ed7bf8fd 203
Kojto 45:50ab13d8f2dc 204 if (data_to_recv) {
Kojto 20:30b6ed7bf8fd 205 read_synchronous(evnt_buff + 10, data_to_recv);
Kojto 45:50ab13d8f2dc 206 }
Kojto 20:30b6ed7bf8fd 207
Kojto 45:50ab13d8f2dc 208 _spi_info.spi_state = eSPI_STATE_READ_EOT;
Kojto 20:30b6ed7bf8fd 209 break;
Kojto 20:30b6ed7bf8fd 210 }
Kojto 45:50ab13d8f2dc 211 return 0;
Kojto 20:30b6ed7bf8fd 212 }
Kojto 20:30b6ed7bf8fd 213
Kojto 34:1ad18123bf11 214 void cc3000_spi::set_wlan_en(uint8_t value) {
Kojto 20:30b6ed7bf8fd 215 if (value) {
Kojto 20:30b6ed7bf8fd 216 _wlan_en = 1;
Kojto 20:30b6ed7bf8fd 217 } else {
Kojto 20:30b6ed7bf8fd 218 _wlan_en = 0;
Kojto 20:30b6ed7bf8fd 219 }
Kojto 20:30b6ed7bf8fd 220 }
Kojto 20:30b6ed7bf8fd 221
Kojto 20:30b6ed7bf8fd 222 void cc3000_spi::WLAN_IRQHandler() {
Kojto 45:50ab13d8f2dc 223 if (_process_irq) {
Kojto 45:50ab13d8f2dc 224 if (_spi_info.spi_state == eSPI_STATE_POWERUP) {
Kojto 45:50ab13d8f2dc 225 // Inform HCI Layer that IRQ occured after powerup
Kojto 45:50ab13d8f2dc 226 _spi_info.spi_state = eSPI_STATE_INITIALIZED;
Kojto 45:50ab13d8f2dc 227 } else if (_spi_info.spi_state == eSPI_STATE_IDLE) {
Kojto 45:50ab13d8f2dc 228 _spi_info.spi_state = eSPI_STATE_READ_IRQ;
Kojto 45:50ab13d8f2dc 229 /* IRQ line goes low - acknowledge it */
vpcola 47:cc9a2501e29f 230 _mutex.lock();
Kojto 45:50ab13d8f2dc 231 _wlan_cs = 0;
Kojto 45:50ab13d8f2dc 232 read_synchronous(_simple_link.get_received_buffer(), 10);
Kojto 45:50ab13d8f2dc 233 _spi_info.spi_state = eSPI_STATE_READ_EOT;
Kojto 20:30b6ed7bf8fd 234
Kojto 45:50ab13d8f2dc 235 // The header was read - continue with the payload read
Kojto 45:50ab13d8f2dc 236 if (!read_data_cont()) {
Kojto 45:50ab13d8f2dc 237 // All the data was read - finalize handling by switching to the task
Kojto 45:50ab13d8f2dc 238 // Trigger Rx processing
Kojto 45:50ab13d8f2dc 239 wlan_irq_disable();
Kojto 45:50ab13d8f2dc 240 _wlan_cs = 1;
vpcola 47:cc9a2501e29f 241 _mutex.unlock();
Kojto 45:50ab13d8f2dc 242 // The magic number resides at the end of the TX/RX buffer (1 byte after the allocated size)
Kojto 45:50ab13d8f2dc 243 // If the magic number is overwitten - buffer overrun occurred - we will be stuck here forever!
Kojto 45:50ab13d8f2dc 244 uint8_t *received_buffer = _simple_link.get_received_buffer();
Kojto 45:50ab13d8f2dc 245 if (received_buffer[CC3000_RX_BUFFER_SIZE - 1] != CC3000_BUFFER_MAGIC_NUMBER) {
Kojto 45:50ab13d8f2dc 246 while (1);
Kojto 45:50ab13d8f2dc 247 }
Kojto 45:50ab13d8f2dc 248
Kojto 45:50ab13d8f2dc 249 _spi_info.spi_state = eSPI_STATE_IDLE;
Kojto 45:50ab13d8f2dc 250 _event.received_handler(received_buffer + SPI_HEADER_SIZE);
Kojto 45:50ab13d8f2dc 251 }
Kojto 45:50ab13d8f2dc 252 } else if (_spi_info.spi_state == eSPI_STATE_WRITE_IRQ) {
Kojto 45:50ab13d8f2dc 253 write_synchronous(_simple_link.get_transmit_buffer(), _spi_info.tx_packet_length);
Kojto 45:50ab13d8f2dc 254 _spi_info.spi_state = eSPI_STATE_IDLE;
Kojto 45:50ab13d8f2dc 255 _wlan_cs = 1;
vpcola 47:cc9a2501e29f 256 _mutex.unlock();
Kojto 45:50ab13d8f2dc 257 }
Kojto 45:50ab13d8f2dc 258 }
Kojto 20:30b6ed7bf8fd 259 }
Kojto 20:30b6ed7bf8fd 260
Kojto 45:50ab13d8f2dc 261 } // namespace mbed_cc3000