status = FALSE;
   }
   culDmaFromRadio(dmaRx, 0, TRUE);

   // Making sure that none of the channels are armed.
   DMA_ABORT_CHANNEL(dmaNumberRx);
   DMA_ABORT_CHANNEL(dmaNumberTx);
   INT_ENABLE(INUM_DMA, INT_ON);

   return status;
} // ends sppInit




//-----------------------------------------------------------------------------
// See cul.h for a description of this function.
//-----------------------------------------------------------------------------
void sppSetAddress(BYTE address){
   myAddress = address;
} // Ends sppSetAddress()




// Internal function which enables the timeout when waiting for an ACK.
void waitForAck(void)
{
   ackTimerNumber = culTimer4AdmSet(ACK_TIMEOUT, &ackTimeout);
   SET_DMA_DEST(dmaRx,pAckBuffer);
   SET_DMA_LENGTH(dmaRx,7);

}   // Ends waitForAck()




//-----------------------------------------------------------------------------
// See cul.h for a description of this function.
//-----------------------------------------------------------------------------
BYTE sppSend(SPP_TX_STRUCT* pPacketPointer){
   BYTE res = TRUE;

   // If data is to be transmitted, the DMA is set up.
   if(pPacketPointer->payloadLength)
   {
      if (pPacketPointer->payloadLength > SPP_MAX_PAYLOAD_LENGTH)
      {
         res = TOO_LONG;
         sppTxStatus = TX_IDLE;
      }
      else
      {
         // Setting up the DMA
         DMA_ABORT_CHANNEL(dmaNumberTx);
         SET_DMA_SOURCE(dmaTx,pPacketPointer->payload);
         SET_DMA_LENGTH(dmaTx,pPacketPointer->payloadLength);
      }
   }

   // Proceed if the packet length is OK.
   if (res == TRUE)
   {
      // Flipping the sequence bit if the transfer is not a retransmission.
      if(!(pPacketPointer->flags & RETRANSMISSION))
      {
         pPacketPointer->flags ^= SEQUENCE_BIT;
      }

      // Clearing RF interrupt flags and enabling RF interrupts.
      if(FSMSTATE == 6 && RXFIFOCNT > 0)
      {
         ISFLUSHRX;
         ISFLUSHRX;
      }

      RFIF &= ~IRQ_TXDONE;
      RFIM &= ~IRQ_SFD;
      INT_SETFLAG(INUM_RF, INT_CLR);

      // Writing the total packet length, addresses and flags to Tx FiFo.
      // Transferring the payload if any.RFD RF Data
      RFD = (pPacketPointer->payloadLength + SPP_HEADER_AND_FOOTER_LENGTH); //加載包長
      RFD = pPacketPointer->destAddress;		//加載目標地址
      RFD = myAddress;							//插入源地址（TX結構體中沒有）
      RFD = pPacketPointer->flags;				//標志
      if(pPacketPointer->payloadLength)
      {
         DMA_ARM_CHANNEL(dmaNumberTx);
         DMA_START_CHANNEL(dmaNumberTx);
      }

      // If the RSSI value is not valid, enable receiver
      if(RSSIL == 0x80)
      {
         ISRXON;
         // Turning on Rx and waiting 320u-sec to make the RSSI value become valid.
         halWait(1);
      }

      //Transmitting
      ISTXONCCA;
      //if(TX_ACTIVE)
      if(FSMSTATE > 30)
      {
         // Asserting the status flag and enabling ACK reception if expected.
         sppTxStatus = TX_IN_PROGRESS;

         if(pPacketPointer->flags & DO_ACK)
         {
            pAckData = pPacketPointer;
            DMA_ABORT_CHANNEL(dmaNumberRx);
            waitForAck();
         }
         else
         {
            pAckData = NULL;
         }
         RFIM |= IRQ_TXDONE;
      }
      else
      {
         ISFLUSHTX;
         res = CHANNEL_BUSY;
         RFIM &= ~IRQ_TXDONE;
         // De-flipping the sequence bit.
         if(!(pPacketPointer->flags & RETRANSMISSION))
         {
            pPacketPointer->flags ^= SEQUENCE_BIT;
         }
      }
   }
   return res;
} // ends sppSend




// Internal function which is called when an ack is received.
// If the ACK is from the expected node, the retransmission of the packet is cancelled.
// 收到一個應答時調用。如果應答是期望的節(jié)點，將取消數(shù)據(jù)包重發(fā)
// static SPP_TX_STRUCT* pAckData; 全局變量
// SPP_TX_STRUCT.結構體在 cul.h 定義
BOOL ackReceived(BYTE sourceAddress)
{
   BOOL res = FALSE;
   if(sourceAddress == pAckData->destAddress)
   {
      res = TRUE;
      culTimer4AdmClear(ackTimerNumber);
      sppTxStatus = TX_SUCCESSFUL;
      retransmissionCounter = 0;
      pAckData = 0;
   }

   return res;
}  //Ends ackReceived()



//-----------------------------------------------------------------------------
// See cul.h for a description of this function.
//-----------------------------------------------------------------------------
#pragma vector=RF_VECTOR
__interrupt void spp_rf_IRQ(void)
{
   BYTE enabledAndActiveInterrupt;

   INT_GLOBAL_ENABLE(INT_OFF);
   enabledAndActiveInterrupt = RFIF;
   RFIF = 0x00;                        // Clear all interrupt flags
   INT_SETFLAG(INUM_RF, INT_CLR);    // Clear MCU interrupt flag
   enabledAndActiveInterrupt &= RFIM;

   // Start of frame delimiter (SFD)
   if(enabledAndActiveInterrupt & IRQ_SFD)
   {
      if(sppRxStatus == RX_WAIT)
      {
         sppRxStatus = RX_IN_PROGRESS;
         RFIM &= ~IRQ_SFD;
      }
   }

   // Transmission of a packet is finished. Enabling reception of ACK if required.
   if(enabledAndActiveInterrupt & IRQ_TXDONE)
   {
      if(sppTxStatus == TX_IN_PROGRESS)
      {
         if(pAckData == NULL)
         {
            sppTxStatus = TX_SUCCESSFUL;
         }
         else
         {
            DMA_ARM_CHANNEL(dmaNumberRx);
         }
      }

      // Clearing the tx done interrupt enable
      RFIM &= ~IRQ_TXDONE;

   }
   INT_GLOBAL_ENABLE(INT_ON);
}





//-----------------------------------------------------------------------------
// See cul.h for a description of this function.
//-----------------------------------------------------------------------------
void sppReceive(SPP_RX_STRUCT* pReceiveData){

   sppRxStatus = RX_WAIT;

   DMA_ABORT_CHANNEL(dmaNumberRx);
   // Setting the address to where the received data are to be written.
   SET_DMA_DEST(dmaRx,pReceiveData);
   SET_DMA_LENGTH(dmaRx,255);

   // Arming the DMA channel. The receiver will initate the transfer when a packet is received.
   DMA_ARM_CHANNEL(dmaNumberRx);
	//FSMSTATE有限狀態(tài)機狀態(tài)
   if(FSMSTATE == 6 && RXFIFOCNT > 0)
   {
      ISFLUSHRX;
      ISFLUSHRX;
   }

   // Turning on the receiver
   ISRXON;

   return;
}



//-----------------------------------------------------------------------------
// See cul.h for a description of this function.
//-----------------------------------------------------------------------------
#pragma vector=RFERR_VECTOR
__interrupt static void rf_error_IRQ(void)
{
   INT_GLOBAL_ENABLE(INT_OFF);

   // If Rx overflow occurs, the Rx FiFo is reset.
   // The Rx DMA is reset and reception is started over.
   if(FSMSTATE == 17)
   {
      STOP_RADIO();
      ISFLUSHRX;
      ISFLUSHRX;
      DMA_ABORT_CHANNEL(dmaNumberRx);
      DMA_ARM_CHANNEL(dmaNumberRx);
      ISRXON;
   }
   else if(FSMSTATE == 56)
   {
      ISFLUSHTX;
   }

   INT_SETFLAG(INUM_RFERR,INT_CLR);

   INT_GLOBAL_ENABLE(INT_ON);
}