Diff: cc3000_spi.cpp

Revision:

0:615c697c33b0

Child:

20:30b6ed7bf8fd

diff -r 000000000000 -r 615c697c33b0 cc3000_spi.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cc3000_spi.cpp	Thu Sep 19 07:55:14 2013 +0000
@@ -0,0 +1,302 @@
+/*****************************************************************************
+*
+*  C++ interface/implementation created by Martin Kojtal (0xc0170). Thanks to
+*  Jim Carver and Frank Vannieuwkerke for their inital cc3000 mbed port and
+*  provided help.
+*
+*  This version of "host driver" uses CC3000 Host Driver Implementation. Thus
+*  read the following copyright:
+*
+*  Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+*
+*  Redistribution and use in source and binary forms, with or without
+*  modification, are permitted provided that the following conditions
+*  are met:
+*
+*    Redistributions of source code must retain the above copyright
+*    notice, this list of conditions and the following disclaimer.
+*
+*    Redistributions in binary form must reproduce the above copyright
+*    notice, this list of conditions and the following disclaimer in the
+*    documentation and/or other materials provided with the
+*    distribution.
+*
+*    Neither the name of Texas Instruments Incorporated nor the names of
+*    its contributors may be used to endorse or promote products derived
+*    from this software without specific prior written permission.
+*
+*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+*  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+*  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+*  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+*  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+*  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+*  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+*  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+*  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+*  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+*  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*
+*****************************************************************************/
+#include "cc3000.h"
+#include "cc3000_spi.h"
+
+namespace mbed_cc3000 {
+
+cc3000_spi::cc3000_spi(PinName cc3000_irq, PinName cc3000_en, PinName cc3000_cs, SPI cc3000_spi, IRQn_Type irq_port, cc3000_event &event, cc3000_simple_link &simple_link)
+  : _wlan_irq(cc3000_irq), _wlan_en(cc3000_en), _wlan_cs(cc3000_cs), _wlan_spi(cc3000_spi), _irq_port(irq_port),
+    _event(event), _simple_link(simple_link) {
+    /* TODO = clear pending interrupts for PORTS. This is dependent on the used chip */
+
+    _wlan_spi.format(8,1);
+    _wlan_spi.frequency(12000000);
+    _function_pointer =  _wlan_irq.fall(this, &cc3000_spi::WLAN_IRQHandler);
+
+    _wlan_en = 0;
+    _wlan_cs = 1;
+}
+
+cc3000_spi::~cc3000_spi() {
+
+}
+
+void cc3000_spi::wlan_irq_enable()
+{
+    NVIC_EnableIRQ(_irq_port);
+}
+
+void cc3000_spi::wlan_irq_disable() {
+    NVIC_DisableIRQ(_irq_port);
+}
+
+void cc3000_spi::wlan_irq_set(uint8_t value) {
+    if (value)
+    {
+        _wlan_en = 1;
+    }
+    else
+    {
+        _wlan_en = 0;
+    }
+}
+
+uint32_t cc3000_spi::wlan_irq_read() {
+    return _wlan_irq.read();
+}
+
+void cc3000_spi::close() {
+    if (_simple_link.get_received_buffer() != 0)
+    {
+      _simple_link.set_received_buffer(0);
+    }
+    wlan_irq_disable();
+}
+
+// void cc3000_spi::SpiReceiveHandler() {
+//     _simple_link.usEventOrDataReceived = 1;
+//     //_simple_link.pucReceivedData = (unsigned char *)pvBuffer;
+
+//     hci_unsolicited_event_handler();
+// }
+
+
+/* TODO
+    pRxPacket, pTxPacket do we need to hold this pointer ?
+    SPIRxHandler - remove?
+*/
+void cc3000_spi::open() {
+   _spi_info.spi_state = eSPI_STATE_POWERUP;
+   //_spi_info.SPIRxHandler = pfRxHandler;
+   _spi_info.tx_packet_length = 0;
+   _spi_info.rx_packet_length = 0;
+   //_rx_buffer[CC3000_RX_BUFFER_SIZE - 1] = CC3000_BUFFER_MAGIC_NUMBER;
+   //_tx_buffer[CC3000_TX_BUFFER_SIZE - 1] = CC3000_BUFFER_MAGIC_NUMBER;
+    wlan_irq_enable();
+}
+
+uint32_t cc3000_spi::first_write(uint8_t *buffer, uint16_t length) {
+    _wlan_cs = 0;
+    wait_us(50);
+
+    /* first 4 bytes of the data */
+    write_synchronous(buffer, 4);
+    wait_us(50);
+    write_synchronous(buffer + 4, length - 4);
+    _spi_info.spi_state = eSPI_STATE_IDLE;
+    _wlan_cs = 1;
+
+    return 0;
+}
+
+
+uint32_t cc3000_spi::write(uint8_t *buffer, uint16_t length) {
+    uint8_t pad = 0;
+ // check the total length of the packet in order to figure out if padding is necessary
+   if(!(length & 0x0001))
+   {
+      pad++;
+   }
+   buffer[0] = WRITE;
+   buffer[1] = HI(length + pad);
+   buffer[2] = LO(length + pad);
+   buffer[3] = 0;
+   buffer[4] = 0;
+
+   length += (SPI_HEADER_SIZE + pad);
+
+   // The magic number resides at the end of the TX/RX buffer (1 byte after the allocated size)
+   // If the magic number is overwitten - buffer overrun occurred - we will be stuck here forever!
+   uint8_t * transmit_buffer = _simple_link.get_transmit_buffer();
+   if (transmit_buffer[CC3000_TX_BUFFER_SIZE - 1] != CC3000_BUFFER_MAGIC_NUMBER)
+   {
+      while (1);
+   }
+
+   if (_spi_info.spi_state == eSPI_STATE_POWERUP)
+   {
+      while (_spi_info.spi_state != eSPI_STATE_INITIALIZED);
+   }
+
+   if (_spi_info.spi_state == eSPI_STATE_INITIALIZED)
+   {
+      // TX/RX transaction over SPI after powerup: IRQ is low - send read buffer size command
+      first_write(buffer, length);
+   }
+   else
+   {
+      // Prevent occurence of a race condition when 2 back to back packets are sent to the
+      // device, so the state will move to IDLE and once again to not IDLE due to IRQ
+      wlan_irq_disable();
+
+      while (_spi_info.spi_state != eSPI_STATE_IDLE);
+
+      _spi_info.spi_state = eSPI_STATE_WRITE_IRQ;
+      //_spi_info.pTxPacket = buffer;
+      _spi_info.tx_packet_length = length;
+
+      // Assert the CS line and wait until the IRQ line is active, then initialize the write operation
+      _wlan_cs = 0;
+
+      wlan_irq_enable();
+   }
+
+   // Wait until the transaction ends
+   while (_spi_info.spi_state != eSPI_STATE_IDLE);
+
+   return 0;
+}
+
+void cc3000_spi::write_synchronous(uint8_t *data, uint16_t size) {
+   while(size)
+   {
+        _wlan_spi.write(*data++);
+        size--;
+   }
+}
+
+void cc3000_spi::read_synchronous(uint8_t *data, uint16_t size) {
+   for (uint32_t i = 0; i < size; i++)
+   {
+        data[i] = _wlan_spi.write(0x03);;
+   }
+}
+
+uint32_t cc3000_spi::read_data_cont() {
+   long data_to_recv;
+   unsigned char *evnt_buff, type;
+
+   //determine the packet type
+   evnt_buff = _simple_link.get_received_buffer();
+   data_to_recv = 0;
+   STREAM_TO_UINT8((uint8_t *)(evnt_buff + SPI_HEADER_SIZE), HCI_PACKET_TYPE_OFFSET, type);
+
+    switch(type)
+    {
+        case HCI_TYPE_DATA:
+        {
+         // Read the remaining data..
+         STREAM_TO_UINT16((uint8_t *)(evnt_buff + SPI_HEADER_SIZE), HCI_DATA_LENGTH_OFFSET, data_to_recv);
+         if (!((HEADERS_SIZE_EVNT + data_to_recv) & 1))
+         {
+              data_to_recv++;
+         }
+
+         if (data_to_recv)
+         {
+               read_synchronous(evnt_buff + 10, data_to_recv);
+         }
+            break;
+        }
+        case HCI_TYPE_EVNT:
+        {
+         // Calculate the rest length of the data
+            STREAM_TO_UINT8((char *)(evnt_buff + SPI_HEADER_SIZE), HCI_EVENT_LENGTH_OFFSET, data_to_recv);
+         data_to_recv -= 1;
+         // Add padding byte if needed
+         if ((HEADERS_SIZE_EVNT + data_to_recv) & 1)
+         {
+               data_to_recv++;
+         }
+
+         if (data_to_recv)
+         {
+               read_synchronous(evnt_buff + 10, data_to_recv);
+         }
+
+         _spi_info.spi_state = eSPI_STATE_READ_EOT;
+            break;
+        }
+    }
+    return (0);
+}
+
+void cc3000_spi::write_wlan_en(uint8_t value) {
+    if (value) {
+        _wlan_en = 1;
+    } else {
+        _wlan_en = 0;
+    }
+}
+
+void cc3000_spi::WLAN_IRQHandler() {
+   if (_spi_info.spi_state == eSPI_STATE_POWERUP)
+   {
+      // Inform HCI Layer that IRQ occured after powerup
+      _spi_info.spi_state = eSPI_STATE_INITIALIZED;
+   }
+   else if (_spi_info.spi_state == eSPI_STATE_IDLE)
+   {
+      _spi_info.spi_state = eSPI_STATE_READ_IRQ;
+      /* IRQ line goes low - acknowledge it */
+       _wlan_cs = 0;
+      read_synchronous(_simple_link.get_received_buffer(), 10);
+      _spi_info.spi_state = eSPI_STATE_READ_EOT;
+
+
+      // The header was read - continue with the payload read
+      if (!read_data_cont())
+      {
+          // All the data was read - finalize handling by switching to the task
+          // Trigger Rx processing
+          wlan_irq_disable();
+          _wlan_cs = 1;
+          // The magic number resides at the end of the TX/RX buffer (1 byte after the allocated size)
+          // If the magic number is overwitten - buffer overrun occurred - we will be stuck here forever!
+          uint8_t *received_buffer = _simple_link.get_received_buffer();
+          if (received_buffer[CC3000_RX_BUFFER_SIZE - 1] != CC3000_BUFFER_MAGIC_NUMBER)
+              {
+                  while (1);
+              }
+              _spi_info.spi_state = eSPI_STATE_IDLE;
+              _event.received_handler(received_buffer + SPI_HEADER_SIZE);
+      }
+   }
+   else if (_spi_info.spi_state == eSPI_STATE_WRITE_IRQ)
+   {
+      write_synchronous(_simple_link.get_transmit_buffer(), _spi_info.tx_packet_length);
+      _spi_info.spi_state = eSPI_STATE_IDLE;
+      _wlan_cs = 1;
+   }
+}
+
+}