File content as of revision 13:c36aa84374e8:

/** BLE KW40Z Driver for Hexiwear
 *  This file contains BLE and Touch Buttons driver functionality for Hexiwear
 *
 * 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 NXP, 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 HOLDER 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.
 *
 * visit: http://www.mikroe.com and http://www.nxp.com
 *
 * get support at: http://www.mikroe.com/forum and https://community.nxp.com
 *
 * Project HEXIWEAR, 2015
 */
 
#include "Hexi_KW40Z.h"

#if defined (LIB_DEBUG) 
RawSerial pc(USBTX, USBRX); // tx, rx
#endif
 
KW40Z::KW40Z(PinName txPin,PinName rxPin) : device(txPin, rxPin), mainThread(&KW40Z::mainStarter, this, osPriorityNormal,1024), rxThread(&KW40Z::rxStarter, this, osPriorityNormal,1024)
{
#if defined (LIB_DEBUG) 
    pc.baud(115200);
    pc.printf("Initializing\r\n");
#endif

    device.baud(230400);
    device.format(8, Serial::None, 2);
    
    rxBuff = (uint8_t*)&hostInterface_rxPacket;
    
    /* initialize callbacks */
    buttonUpCb = NULL;
    buttonDownCb = NULL;
    buttonLeftCb = NULL;
    buttonRightCb = NULL;
    buttonSlideCb = NULL;
    alertCb = NULL;
    passkeyCb = NULL;
    notificationsCb = NULL;
    
    /* intialization finalized, signal to start the threads */
    mainThread.signal_set(START_THREAD);
    rxThread.signal_set(START_THREAD);
}

KW40Z::~KW40Z(void)
{
}

void KW40Z::attach_buttonUp(button_t btnFct)
{
    buttonUpCb = btnFct;
}
void KW40Z::attach_buttonDown(button_t btnFct)
{
    buttonDownCb = btnFct;
}

void KW40Z::attach_buttonLeft(button_t btnFct)
{
    buttonLeftCb = btnFct;
}

void KW40Z::attach_buttonRight(button_t btnFct)
{
    buttonRightCb = btnFct;
}

void KW40Z::attach_buttonSlide(button_t btnFct)
{
    buttonSlideCb = btnFct;
}

void KW40Z::attach_alert(alert_t alertFct)
{
    alertCb = alertFct;
}

void KW40Z::attach_passkey(passkey_t passkeyFct)
{
    passkeyCb = passkeyFct;
}

void KW40Z::attach_notifications(notifications_t notFct)
{
    notificationsCb = notFct;
}

void KW40Z::rxStarter(void const *p) {
  KW40Z *instance = (KW40Z*)p;
  instance->rxTask();
}

void KW40Z::mainStarter(void const *p) {
  KW40Z *instance = (KW40Z*)p;
  instance->mainTask();
}

void KW40Z::GetVersion()
{
    hostInterface_packet_t txPacket = {0};
    
    txPacket.start1     = gHostInterface_startByte1,
    txPacket.start2     = gHostInterface_startByte2,
    txPacket.type       = packetType_buildVersion,
    txPacket.length     = 3,
    txPacket.data[0]    = HEXIWEAR_VERSION_MAJOR;
    txPacket.data[1]    = HEXIWEAR_VERSION_MINOR;
    txPacket.data[2]    = HEXIWEAR_VERSION_PATCH;
    txPacket.data[3]    = gHostInterface_trailerByte;
    
    SendPacket(&txPacket, false);
}

void KW40Z::SendPacket(hostInterface_packet_t * txPacket, bool confirmRequested)
{
    uint8_t retries = 0;
    confirmReceived = false;
    
    do
    {
        char * txBuff = (char *)txPacket;
        uint8_t length = txPacket->length + gHostInterface_headerSize + 1;
        
        if(confirmRequested == true)
        {
            txPacket->start2 |= 0x01;
        }
        
        for(uint8_t i = 0; i < length; i++)
        {
            device.putc(*txBuff);
            txBuff++;
        }
        
#if defined (LIB_DEBUG)   
        DebugPrintTxPacket(txPacket);
#endif

        retries++;
        
        #if defined (gHostInterface_RxConfirmationEnable)
        if((confirmRequested == true) && (confirmReceived == false))
        {
            Thread::wait(gHostInterface_retransmitTimeout);
        }
        #endif
    }
    while((confirmRequested == true) && 
          (confirmReceived == false) && 
          (retries < gHostInterface_retransmitCount));
}

void KW40Z::mainTask(void)
{
    mainThread.signal_wait(START_THREAD);

#if defined (LIB_DEBUG)     
    pc.printf("MainTask Stared\r\n");
#endif

    while(1)
    {
        osEvent evt = queue.get();
        if (evt.status == osEventMessage) 
        {
            hostInterface_packet_t *rxPacket = (hostInterface_packet_t*)evt.value.p;
            ProcessReceivedPacket(rxPacket);
            mpool.free(rxPacket);
        }
    }
}

void KW40Z::rxTask(void)
{
    rxThread.signal_wait(START_THREAD);

#if defined (LIB_DEBUG)     
    pc.printf("RxTask Stared\r\n");
#endif

    while(1)
    {
        if(device.readable()) 
        {   
            *rxBuff++ = device.getc();
            ProcessBuffer();
            
            /* check for buffer overflow */
            if(rxBuff >= ((uint8_t*)&hostInterface_rxPacket + sizeof(hostInterface_rxPacket)))
            {
                rxBuff = (uint8_t*)&hostInterface_rxPacket;
            }
        }
    }
}

#if defined (LIB_DEBUG) 
void KW40Z::DebugPrintTxPacket(hostInterface_packet_t * txPacket)
{
    char * txBuff = (char *)txPacket;
    uint8_t length = txPacket->length + gHostInterface_headerSize + 1;

    pc.printf("Tx: ");    
    for(uint8_t i = 0; i < length; i++)
    {
        pc.printf("%02X ",*txBuff);
        txBuff++;
    }
    pc.printf("\r\n");
}

void KW40Z::DebugPrintRxPacket()
{
    pc.printf("RX: ");
    for(uint8_t * i = (uint8_t*)&hostInterface_rxPacket; i<rxBuff; i++)
    {
        pc.printf("%02X ",*i);
    }
    pc.printf("\r\n");
}
#endif

void KW40Z::ProcessBuffer()
{    
    /* check if header has been received */
    if(rxBuff > ((uint8_t*)&hostInterface_rxPacket + gHostInterface_headerSize))
    {
        /* check packet header */
        if((gHostInterface_startByte1 != hostInterface_rxPacket.start1)||
           (gHostInterface_startByte2 != (hostInterface_rxPacket.start2 & 0xFE))||
           (hostInterface_rxPacket.length > gHostInterface_dataSize))
        {
#if defined (LIB_DEBUG) 
            DebugPrintRxPacket();
            pc.printf("check header failed\r\n");
#endif
      
            SearchStartByte();
        }
        else
        {
            /* check data length */
            if(rxBuff > ((uint8_t*)&hostInterface_rxPacket + gHostInterface_headerSize + hostInterface_rxPacket.length)) 
            {
                /* check trailer byte */
                if(gHostInterface_trailerByte != hostInterface_rxPacket.data[hostInterface_rxPacket.length])
                {
#if defined (LIB_DEBUG) 
                    DebugPrintRxPacket();
                    pc.printf("trailer byte failed\r\n");
#endif

                    SearchStartByte();
                }
                else
                {   
                
                    #if defined (gHostInterface_RxConfirmationEnable)
                    if(hostInterface_rxPacket.type == packetType_OK)
                    {
                        confirmReceived = true;
                    }
                    #endif
                    
                    /* send message to main task */
                    hostInterface_packet_t *rxPacket = mpool.alloc();
                    memcpy(rxPacket, &hostInterface_rxPacket, sizeof(hostInterface_packet_t));
                    queue.put(rxPacket);

#if defined (LIB_DEBUG)                     
                    DebugPrintRxPacket();
#endif 
                    /* reset buffer position */
                    rxBuff = (uint8_t*)&hostInterface_rxPacket;
                } 
            }      
        }
    }
}

void KW40Z::SearchStartByte()
{
    bool found = false;
    uint8_t * rdIdx = (uint8_t*)&hostInterface_rxPacket + 1;
    
    while(rdIdx < rxBuff)
    {
        if(*rdIdx == gHostInterface_startByte1)
        {
            uint32_t len = rxBuff - rdIdx;
            
            memcpy(&hostInterface_rxPacket,rdIdx,len);
            rxBuff -= len;
            found = true;
            
#if defined (LIB_DEBUG) 
            pc.printf("moving ");
#endif
            break;
        }
        rdIdx++;
    }
    
    if(!found)
    {
        /* reset buffer position */
        rxBuff = (uint8_t*)&hostInterface_rxPacket;
    }
    
#if defined (LIB_DEBUG) 
    pc.printf("search done\r\n");
    DebugPrintRxPacket();
#endif
}

void KW40Z::SendPacketOK()
{
    hostInterface_packet_t txPacket = {0};
    
    txPacket.start1     = gHostInterface_startByte1,
    txPacket.start2     = gHostInterface_startByte2,
    txPacket.type       = packetType_OK,
    txPacket.length     = 0,
    txPacket.data[0]    = gHostInterface_trailerByte;
    
    SendPacket(&txPacket, false);    
}

void KW40Z::ConfirmPacketOK()
{
}

void KW40Z::ProcessReceivedPacket(hostInterface_packet_t * rxPacket)
{
#if defined (LIB_DEBUG) 
    pc.printf("packet found %d\r\n", rxPacket->type);
#endif

#ifdef gHostInterface_TxConfirmationEnable
      // acknowledge the packet reception
      if ( 1 == ( rxPacket->start2 & 0x01 ) )
      {
          SendPacketOK();
      }
#endif
    
    switch(rxPacket->type)
    {
        /* button presses */
        case packetType_pressUp:
            if(buttonUpCb != NULL) buttonUpCb();
            break;
            
        case packetType_pressDown:
            if(buttonDownCb != NULL) buttonDownCb();
            break;
            
        case packetType_pressLeft:
            if(buttonLeftCb != NULL) buttonLeftCb();
            break;
            
        case packetType_pressRight:
            if(buttonRightCb != NULL) buttonRightCb();
            break;
        
        case packetType_slide:
            if(buttonSlideCb != NULL) buttonSlideCb();
            break;
    
        /* Alert Service */
        case packetType_alertIn:
            if(alertCb != NULL) alertCb(&rxPacket->data[0], rxPacket->length);
            break;
        
        /* Passkey for pairing received */
        case packetType_passDisplay:
            if(passkeyCb != NULL) passkeyCb(&rxPacket->data[0]);
            break;
            
        /* OTAP messages */
        case packetType_otapCompleted:
        case packetType_otapFailed:
            break;
            
        /* TSI Status */
        case packetType_buttonsGroupSendActive:
            break;
            
        /* Advertisement Mode Info */
        case packetType_advModeSend:
            break;
        
        /* Link State */
        case packetType_linkStateSend:
            break;
            
        /* ANCS Service Notification Received */
        case packetType_notification:
            if(notificationsCb != NULL) notificationsCb(rxPacket->data[0], rxPacket->data[1]);
            break;
            
        /* Build version */
        case packetType_buildVersion:
            break;
      
        case packetType_OK:
            /* do nothing, the flag is set in the RxTask */
            break;
    
        default:
            break;
    }
}