Re-add in old Endpoint/Pipe workaround for unordered pipes - add new ORDERED_EP_CONFI...

[pub/USBasp.git] / Demos / Host / Incomplete / BluetoothHost / Lib / RFCOMM.c

diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
index 8e533ac..ac78951 100644 (file)
--- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
+++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
@@ -1,21 +1,21 @@
 /*
              LUFA Library
      Copyright (C) Dean Camera, 2010.
 /*
              LUFA Library
      Copyright (C) Dean Camera, 2010.

-              
+

   dean [at] fourwalledcubicle [dot] com
   dean [at] fourwalledcubicle [dot] com

-      www.fourwalledcubicle.com
+           www.lufa-lib.org

 */
 
 /*
   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
 
 */
 
 /*
   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
 

-  Permission to use, copy, modify, distribute, and sell this 
+  Permission to use, copy, modify, distribute, and sell this

   software and its documentation for any purpose is hereby granted
   software and its documentation for any purpose is hereby granted

-  without fee, provided that the above copyright notice appear in 
+  without fee, provided that the above copyright notice appear in

   all copies and that both that the copyright notice and this
   all copies and that both that the copyright notice and this

-  permission notice and warranty disclaimer appear in supporting 
-  documentation, and that the name of the author not be used in 
-  advertising or publicity pertaining to distribution of the 
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the

   software without specific, written prior permission.
 
   The author disclaim all warranties with regard to this
   software without specific, written prior permission.
 
   The author disclaim all warranties with regard to this


@@ -65,40 +65,83 @@ const uint8_t CRC8_Table[256] PROGMEM =
 RFCOMM_Channel_t RFCOMM_Channels[RFCOMM_MAX_OPEN_CHANNELS];
 
 
 RFCOMM_Channel_t RFCOMM_Channels[RFCOMM_MAX_OPEN_CHANNELS];
 
 

-/** Initializes the RFCOMM service, ready for new connections from a SDP client. */
+/** Initialises the RFCOMM service, ready for new connections from a SDP client. */

 void RFCOMM_Initialize(void)
 {
 void RFCOMM_Initialize(void)
 {

-       /* Reset the RFCOMM channel structures, to invalidate any confiured RFCOMM channels */
+       /* Reset the RFCOMM channel structures, to invalidate any configured RFCOMM channels */

        for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
        for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)

-         RFCOMM_Channels[i].DLCI = 0x00;
+         RFCOMM_Channels[i].State = RFCOMM_Channel_Closed;

 }
 
 }
 

-void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
+/** Services all the logical RFCOMM channels on the given ACL channel, sending any RFCOMM control requests to
+ *  the remote device as needed to establish new logical RFCOMM channels. This function should be called repeatedly
+ *  in the main program loop when an ACL channel with an RFCOMM PSM has been established between the local and remote
+ *  device.
+ *
+ *  \param[in] ACLChannel  ACL channel which has been previously opened to handle RFCOMM traffic between devices
+ */
+void RFCOMM_ServiceChannels(Bluetooth_Channel_t* const ACLChannel)
+{
+       /* Abort if the RFCOMM ACL channel is not currently open */
+       if ((ACLChannel == NULL) || (ACLChannel->State != BT_Channel_Open))
+         return;
+
+       /* Loop through each of the RFCOMM channels, send any required RFCOMM control commands */
+       for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
+       {
+               RFCOMM_Channel_t* RFCOMMChannel = &RFCOMM_Channels[i];
+
+               if (RFCOMMChannel->State == RFCOMM_Channel_Configure)
+               {
+                       /* Check if the local signals have not yet been sent on the current channel */
+                       if (!(RFCOMMChannel->ConfigFlags & RFCOMM_CONFIG_LOCALSIGNALSSENT))
+                       {
+                               /* Indicate that the local signals have been sent, transmit them to the remote device */
+                               RFCOMMChannel->ConfigFlags |= RFCOMM_CONFIG_LOCALSIGNALSSENT;
+                               RFCOMM_SendChannelSignals(RFCOMMChannel, ACLChannel);
+                       }
+
+                       /* If signals have been configured in both directions, progress to the open state */
+                       if ((RFCOMMChannel->ConfigFlags & (RFCOMM_CONFIG_REMOTESIGNALS | RFCOMM_CONFIG_LOCALSIGNALS)) ==
+                                                         (RFCOMM_CONFIG_REMOTESIGNALS | RFCOMM_CONFIG_LOCALSIGNALS))
+                       {
+                               RFCOMMChannel->State = RFCOMM_Channel_Open;
+                               RFCOMM_ChannelOpened(RFCOMMChannel);
+                       }
+               }
+       }
+}
+
+/** Processes an incoming RFCOMM packet on an ACL channel which has been previously opened between the local and
+ *  a remote device to handle RFCOMM traffic.
+ *
+ *  \param[in] Data        Incoming packet data containing the RFCOMM packet
+ *  \param[in] ACLChannel  ACL channel the request was issued to by the remote device
+ */
+void RFCOMM_ProcessPacket(void* Data,
+                          Bluetooth_Channel_t* const ACLChannel)

 {
        const RFCOMM_Header_t* FrameHeader  = (const RFCOMM_Header_t*)Data;
        const uint8_t*         FrameData    = (const uint8_t*)Data + sizeof(RFCOMM_Header_t);
 {
        const RFCOMM_Header_t* FrameHeader  = (const RFCOMM_Header_t*)Data;
        const uint8_t*         FrameData    = (const uint8_t*)Data + sizeof(RFCOMM_Header_t);

-       uint16_t               FrameDataLen = RFCOMM_GetFrameDataLength(FrameData);
+       uint16_t               FrameDataLen = RFCOMM_GetVariableFieldValue(&FrameData);

 
 

-       /* Adjust the frame data pointer to skip over the variable size field */
-       FrameData += (FrameDataLen < 128) ? 1 : 2;
-       

        /* Decode the RFCOMM frame type from the header */
        switch (FrameHeader->Control & ~FRAME_POLL_FINAL)
        {
                case RFCOMM_Frame_DM:
        /* Decode the RFCOMM frame type from the header */
        switch (FrameHeader->Control & ~FRAME_POLL_FINAL)
        {
                case RFCOMM_Frame_DM:

-                       RFCOMM_ProcessDM(&FrameHeader->Address, Channel);
+                       RFCOMM_ProcessDM(&FrameHeader->Address, ACLChannel);

                        break;
                case RFCOMM_Frame_DISC:
                        break;
                case RFCOMM_Frame_DISC:

-                       RFCOMM_ProcessDISC(&FrameHeader->Address, Channel);
+                       RFCOMM_ProcessDISC(&FrameHeader->Address, ACLChannel);

                        break;
                case RFCOMM_Frame_SABM:
                        break;
                case RFCOMM_Frame_SABM:

-                       RFCOMM_ProcessSABM(&FrameHeader->Address, Channel);
+                       RFCOMM_ProcessSABM(&FrameHeader->Address, ACLChannel);

                        break;
                case RFCOMM_Frame_UA:
                        break;
                case RFCOMM_Frame_UA:

-                       RFCOMM_ProcessUA(&FrameHeader->Address, Channel);
+                       RFCOMM_ProcessUA(&FrameHeader->Address, ACLChannel);

                        break;
                case RFCOMM_Frame_UIH:
                        break;
                case RFCOMM_Frame_UIH:

-                       RFCOMM_ProcessUIH(&FrameHeader->Address, FrameDataLen, FrameData, Channel);
+                       RFCOMM_ProcessUIH(&FrameHeader->Address, FrameDataLen, FrameData, ACLChannel);

                        break;
                default:
                        BT_RFCOMM_DEBUG(1, "<< Unknown Frame Received");
                        break;
                default:
                        BT_RFCOMM_DEBUG(1, "<< Unknown Frame Received");


@@ -106,132 +149,130 @@ void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
        }
 }
 
        }
 }
 

-static void RFCOMM_ProcessDM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+/** Sends an RFCOMM notification to the remote device that the local terminal control signals (located in the
+ *  "Local" structure of the RFCOMM channel) have changed, pushing the new signals to the remote device.
+ *
+ *  \param[in] RFCOMMChannel  RFCOMM logical channel whose local terminal signals have changed
+ *  \param[in] ACLChannel     ACL channel which has been opened to carry RFCOMM traffic between devices
+ */
+void RFCOMM_SendChannelSignals(const RFCOMM_Channel_t* const RFCOMMChannel,
+                               Bluetooth_Channel_t* const ACLChannel)

 {
 {

-       BT_RFCOMM_DEBUG(1, "<< DM Received");
-       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+       BT_RFCOMM_DEBUG(1, ">> MSC Command");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", RFCOMMChannel->DLCI);
+
+       struct
+       {
+               RFCOMM_Command_t        CommandHeader;
+               uint8_t                 Length;
+               RFCOMM_MSC_Parameters_t Params;
+       } MSCommand;
+
+       MSCommand.CommandHeader      = (RFCOMM_Command_t){.Command = RFCOMM_Control_ModemStatus, .EA = true, .CR = true};
+       MSCommand.Length             = (sizeof(MSCommand.Params) << 1) | 0x01;
+       MSCommand.Params.Channel     = (RFCOMM_Address_t){.DLCI = RFCOMMChannel->DLCI, .EA = true, .CR = true};
+       MSCommand.Params.Signals     = RFCOMMChannel->Local.Signals;
+       MSCommand.Params.BreakSignal = RFCOMMChannel->Local.BreakSignal;
+
+       /* Send the MSC command to the remote device */
+       RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, true, RFCOMM_Frame_UIH, sizeof(MSCommand), &MSCommand, ACLChannel);

 }
 
 }
 

-static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+/** Sends new data through an open logical RFCOMM channel. This should be used to transmit data through a
+ *  RFCOMM channel once it has been opened.
+ *
+ *  \param[in] DataLen        Length of the RFCOMM data to send, in bytes
+ *  \param[in] Data           Pointer to a buffer where the data to send is located
+ *  \param[in] RFCOMMChannel  RFCOMM logical channel which is to be transmitted to
+ *  \param[in] ACLChannel     ACL channel which has been opened to carry RFCOMM traffic between devices
+ */
+void RFCOMM_SendData(const uint16_t DataLen,
+                     const uint8_t* Data,
+                     const RFCOMM_Channel_t* const RFCOMMChannel,
+                     Bluetooth_Channel_t* const ACLChannel)

 {
 {

-       BT_RFCOMM_DEBUG(1, "<< DISC Received");
-       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+       if (RFCOMMChannel->State != RFCOMM_Channel_Open)
+         return;

 
 

-       // TODO: Close down connection
+       BT_RFCOMM_DEBUG(1, ">> UIH Frame");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", RFCOMMChannel->DLCI);

 
 

-       BT_RFCOMM_DEBUG(1, ">> UA Sent");
-       RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
+       /* Send the MSC command to the remote device */
+       RFCOMM_SendFrame(RFCOMMChannel->DLCI, false, RFCOMM_Frame_UIH, DataLen, Data, ACLChannel);

 }
 
 }
 

-static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+RFCOMM_Channel_t* RFCOMM_GetFreeChannelEntry(const uint8_t DLCI)

 {
 {

-       BT_RFCOMM_DEBUG(1, "<< SABM Received");
-       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
-       

        /* Find a free entry in the RFCOMM channel multiplexer state array */
        for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
        {
        /* Find a free entry in the RFCOMM channel multiplexer state array */
        for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
        {

-               RFCOMM_Channel_t* CurrRFCOMMChannel = RFCOMM_Channels[i];
-       
-               /* If the channel's DLCI is zero, the channel state entry is free */
-               if (!(CurrRFCOMMChannel->DLCI))
+               RFCOMM_Channel_t* RFCOMMChannel = &RFCOMM_Channels[i];
+
+               /* If the channel's state is closed, the channel state entry is free */
+               if (RFCOMMChannel->State == RFCOMM_Channel_Closed)

                {
                {

-                       CurrRFCOMMChannel->DLCI       = FrameAddress->DLCI;
-                       CurrRFCOMMChannel->Configured = false;
-               
-                       BT_RFCOMM_DEBUG(1, ">> UA Sent");
-                       RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
-                       return;
+                       RFCOMMChannel->DLCI               = DLCI;
+                       RFCOMMChannel->State              = RFCOMM_Channel_Configure;
+                       RFCOMMChannel->Priority           = 7 + (RFCOMMChannel->DLCI & 0xF8);
+                       RFCOMMChannel->MTU                = 0xFFFF;
+                       RFCOMMChannel->Remote.Signals     = 0 | (1 << 0);
+                       RFCOMMChannel->Remote.BreakSignal = 0 | (1 << 0);
+                       RFCOMMChannel->Local.Signals      = RFCOMM_SIGNAL_RTC | RFCOMM_SIGNAL_RTR | RFCOMM_SIGNAL_DV | (1 << 0);
+                       RFCOMMChannel->Local.BreakSignal  = 0 | (1 << 0);
+                       RFCOMMChannel->ConfigFlags        = 0;
+
+                       return RFCOMMChannel;

                }
        }
 
                }
        }
 

-       BT_RFCOMM_DEBUG(1, ">> DM Sent");
-
-       /* No free channel in the multiplexer - decline the SABM by sending a DM frame */
-       RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_DM | FRAME_POLL_FINAL), 0, NULL, Channel);
-}
-
-static void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
-{
-       BT_RFCOMM_DEBUG(1, "<< UA Received");
-       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+       return NULL;

 }
 
 }
 

-static void RFCOMM_ProcessUIH(const RFCOMM_Address_t* const FrameAddress, const uint16_t FrameLength, 
-                              const uint8_t* FrameData, Bluetooth_Channel_t* const Channel)
+RFCOMM_Channel_t* RFCOMM_GetChannelData(const uint8_t DLCI)

 {
 {

-       BT_RFCOMM_DEBUG(1, "<< UIH Received");
-       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
-       BT_RFCOMM_DEBUG(2, "-- Length 0x%02X", FrameLength);
-       
-       if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
+       /* Search through the RFCOMM channel list, looking for the specified channel */
+       for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)

        {
        {

-               RFCOMM_ProcessControlCommand((const RFCOMM_Command_t*)FrameData, Channel);
-               return;
+               RFCOMM_Channel_t* CurrRFCOMMChannel = &RFCOMM_Channels[i];
+
+               /* If the current non-closed channel's DLCI matches the search DLCI, return it to the caller */
+               if ((CurrRFCOMMChannel->State != RFCOMM_Channel_Closed) && (CurrRFCOMMChannel->DLCI == DLCI))
+                 return CurrRFCOMMChannel;

        }
 
        }
 

-       // TODO: Handle regular channel data here
+       /* Channel not found in the channel state table, return failure */
+       return NULL;

 }
 
 }
 

-static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader, Bluetooth_Channel_t* const Channel)
+uint16_t RFCOMM_GetVariableFieldValue(const uint8_t** BufferPos)

 {
 {

-       const uint8_t* CommandData = (const uint8_t*)Data + sizeof(RFCOMM_Command_t);
+       uint8_t FirstOctet;
+       uint8_t SecondOctet = 0;

 
 

-       switch (CommandHeader->Command)
+       FirstOctet = **BufferPos;
+       (*BufferPos)++;
+
+       /* If the field size is more than a single byte, fetch the next byte in the variable length field */
+       if (!(FirstOctet & 0x01))

        {
        {

-               case RFCOMM_Control_Test:
-                       BT_RFCOMM_DEBUG(1, "<< TEST Command");
-                       break;
-               case RFCOMM_Control_FlowControlEnable:
-                       BT_RFCOMM_DEBUG(1, "<< FCE Command");
-                       break;
-               case RFCOMM_Control_FlowControlDisable:
-                       BT_RFCOMM_DEBUG(1, "<< FCD Command");
-                       break;
-               case RFCOMM_Control_ModemStatus:
-                       BT_RFCOMM_DEBUG(1, "<< MS Command");
-                       break;
-               case RFCOMM_Control_RemotePortNegotiation:
-                       BT_RFCOMM_DEBUG(1, "<< RPN Command");
-                       break;
-               case RFCOMM_Control_RemoteLineStatus:
-                       BT_RFCOMM_DEBUG(1, "<< RLS Command");
-                       break;
-               case RFCOMM_Control_DLCParameterNegotiation:
-                       BT_RFCOMM_DEBUG(1, "<< DPN Command");
-
-                       // TODO - Set channel state
-//                     RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(
-                       RFCOMMChannel->Configured = true;
-                       
-                       // TODO - send ACK/NAK response                 
-                       break;
-               default:
-                       BT_RFCOMM_DEBUG(1, "<< Unknown Command");                       
+               SecondOctet = **BufferPos;
+               (*BufferPos)++;

 
 

-                       struct
-                       {
-                               RFCOMM_Command_t Header;
-                               RFCOMM_Command_t Command;
-                       } Response =
-                               {
-                                       .Header = (RFCOMM_Command_t)
-                                       {
-                                               .Command = RFCOMM_Control_NonSupportedCommand,
-                                               .CR      = true,
-                                               .EA      = true,
-                                       },
-                                       
-                                       .Command = *CommandHeader,
-                               };
-
-                       RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(RFCOMM_Command_t), &Response, Channel);                   
-                       break;
+               /* Discard any remaining bytes in the variable length field that won't fit in the return value */
+               while (!(**BufferPos & 0x01))
+                 (*BufferPos)++;

        }
        }

+
+       /* Bit-shift the bytes that comprise the variable length field so that they form a single integer */
+       return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);

 }
 
 }
 

-static void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, const uint8_t Control, const uint16_t DataLen,
-                             const void* Data, Bluetooth_Channel_t* const Channel)
+void RFCOMM_SendFrame(const uint8_t DLCI,
+                      const bool CommandResponse,
+                      const uint8_t Control,
+                      const uint16_t DataLen,
+                      const void* Data,
+                      Bluetooth_Channel_t* const ACLChannel)

 {
        struct
        {
 {
        struct
        {


@@ -240,72 +281,137 @@ static void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, con
                uint8_t         Data[DataLen];
                uint8_t         FCS;
        } ResponsePacket;
                uint8_t         Data[DataLen];
                uint8_t         FCS;
        } ResponsePacket;

-       
+

        /* Set the frame header values to the specified address and frame type */
        ResponsePacket.FrameHeader.Control = Control;
        /* Set the frame header values to the specified address and frame type */
        ResponsePacket.FrameHeader.Control = Control;

-       ResponsePacket.FrameHeader.Address = (RFCOMM_Address_t)
-               {
-                       .EA   = true,
-                       .CR   = CommandResponse,
-                       .DLCI = DLCI,
-               };
-       
+       ResponsePacket.FrameHeader.Address = (RFCOMM_Address_t){.DLCI = DLCI, .EA   = true, .CR = CommandResponse};
+

        /* Set the lower 7 bits of the packet length */
        ResponsePacket.Size[0] = (DataLen << 1);
        /* Set the lower 7 bits of the packet length */
        ResponsePacket.Size[0] = (DataLen << 1);

-       
+

        /* Terminate the size field if size is 7 bits or lower, otherwise set the upper 8 bits of the length */
        if (DataLen < 128)
          ResponsePacket.Size[0] |= 0x01;
        else
          ResponsePacket.Size[1]  = (DataLen >> 7);
        /* Terminate the size field if size is 7 bits or lower, otherwise set the upper 8 bits of the length */
        if (DataLen < 128)
          ResponsePacket.Size[0] |= 0x01;
        else
          ResponsePacket.Size[1]  = (DataLen >> 7);

-       
+

        /* Copy over the packet data from the source buffer to the response packet buffer */
        memcpy(ResponsePacket.Data, Data, DataLen);
        /* Copy over the packet data from the source buffer to the response packet buffer */
        memcpy(ResponsePacket.Data, Data, DataLen);

-       
+

        /* Determine the length of the frame which is to be used to calculate the CRC value */
        uint8_t CRCLength = sizeof(ResponsePacket.FrameHeader);
 
        /* UIH frames do not have the CRC calculated on the Size field in the response, all other frames do */
        if ((Control & ~FRAME_POLL_FINAL) != RFCOMM_Frame_UIH)
          CRCLength += sizeof(ResponsePacket.Size);
        /* Determine the length of the frame which is to be used to calculate the CRC value */
        uint8_t CRCLength = sizeof(ResponsePacket.FrameHeader);
 
        /* UIH frames do not have the CRC calculated on the Size field in the response, all other frames do */
        if ((Control & ~FRAME_POLL_FINAL) != RFCOMM_Frame_UIH)
          CRCLength += sizeof(ResponsePacket.Size);

-       
+

        /* Calculate the frame checksum from the appropriate fields */
        ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, CRCLength);
 
        /* Send the completed response packet to the sender */
        /* Calculate the frame checksum from the appropriate fields */
        ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, CRCLength);
 
        /* Send the completed response packet to the sender */

-       Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), Channel);
+       Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), ACLChannel);

 }
 
 }
 

-static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length)
+static uint8_t RFCOMM_GetFCSValue(const void* FrameStart,
+                                  uint8_t Length)

 {
        uint8_t FCS = 0xFF;
 {
        uint8_t FCS = 0xFF;

-       
+
+       /* Calculate new Frame CRC value via the given data bytes and the CRC table */

        for (uint8_t i = 0; i < Length; i++)
        for (uint8_t i = 0; i < Length; i++)

-         FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((uint8_t*)FrameStart)[i]]);
+         FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((const uint8_t*)FrameStart)[i]]);

 
        return ~FCS;
 }
 
 
        return ~FCS;
 }
 

-static uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos)
+static void RFCOMM_ProcessDM(const RFCOMM_Address_t* const FrameAddress,
+                             Bluetooth_Channel_t* const ACLChannel)

 {
 {

-       uint8_t FirstOctet  = BufferPos[0];
-       uint8_t SecondOctet = 0;
-       
-       if (!(FirstOctet & 0x01))
-         SecondOctet = BufferPos[1];
-       
-       return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);
+       BT_RFCOMM_DEBUG(1, "<< DM Received");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);

 }
 
 }
 

-RFCOMM_Channel_t RFCOMM_GetChannelData(const uint8_t DLCI)
+static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress,
+                               Bluetooth_Channel_t* const ACLChannel)

 {
 {

-       for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
+       BT_RFCOMM_DEBUG(1, "<< DISC Received");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+
+       RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);
+
+       /* If the requested channel is currently open, destroy it */
+       if (RFCOMMChannel != NULL)
+         RFCOMMChannel->State = RFCOMM_Channel_Closed;
+
+       BT_RFCOMM_DEBUG(1, ">> UA Sent");
+       RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, ACLChannel);
+}
+
+static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress,
+                               Bluetooth_Channel_t* const ACLChannel)
+{
+       BT_RFCOMM_DEBUG(1, "<< SABM Received");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+
+       if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)

        {
        {

-               RFCOMM_Channel_t* CurrRFCOMMChannel = RFCOMM_Channels[i];
-       
-               if (CurrRFCOMMChannel->DLCI == DLCI)
-                 return CurrRFCOMMChannel;
+               BT_RFCOMM_DEBUG(1, ">> UA Sent");
+
+               /* Free channel found, or request was to the control channel - accept SABM by sending a UA frame */
+               RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, ACLChannel);
+
+               return;
+       }
+
+       /* Find the existing channel's entry in the channel table */
+       RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);
+
+       /* Existing entry not found, create a new entry for the channel */
+       if (RFCOMMChannel == NULL)
+         RFCOMMChannel = RFCOMM_GetFreeChannelEntry(FrameAddress->DLCI);
+
+       /* If space was found in the channel table for the new channel, ACK the request */
+       if (RFCOMMChannel != NULL)
+       {
+               BT_RFCOMM_DEBUG(1, ">> UA Sent");
+
+               /* Free channel found, or request was to the control channel - accept SABM by sending a UA frame */
+               RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, ACLChannel);
+       }
+       else
+       {
+               BT_RFCOMM_DEBUG(1, ">> DM Sent");
+
+               /* No free channel in the multiplexer - decline the SABM by sending a DM frame */
+               RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_DM | FRAME_POLL_FINAL), 0, NULL, ACLChannel);

        }
        }

-       
-       return NULL;

 }
 }

+
+static void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress,
+                             Bluetooth_Channel_t* const ACLChannel)
+{
+       BT_RFCOMM_DEBUG(1, "<< UA Received");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+}
+
+static void RFCOMM_ProcessUIH(const RFCOMM_Address_t* const FrameAddress,
+                              const uint16_t FrameLength,
+                              const uint8_t* FrameData,
+                              Bluetooth_Channel_t* const ACLChannel)
+{
+       if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
+       {
+               RFCOMM_ProcessControlCommand(FrameData, ACLChannel);
+               return;
+       }
+
+       BT_RFCOMM_DEBUG(1, "<< UIH Received");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+       BT_RFCOMM_DEBUG(2, "-- Length 0x%02X", FrameLength);
+
+       RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);
+
+       if (RFCOMMChannel != NULL)
+         RFCOMM_DataReceived(RFCOMMChannel, FrameLength, FrameData);
+}
+