More RFCOMM layer additions - begin to add multiplexer channel state variables.

diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
index 75fe17b..8e533ac 100644 (file)
--- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
+++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
@@ -61,10 +61,16 @@ const uint8_t CRC8_Table[256] PROGMEM =
                0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
        };
 
+/** RFCOMM channel state structure, to retain information about each open channel in the RFCOMM multiplexer. */
+RFCOMM_Channel_t RFCOMM_Channels[RFCOMM_MAX_OPEN_CHANNELS];
+
+
 /** Initializes the RFCOMM service, ready for new connections from a SDP client. */
 void RFCOMM_Initialize(void)
 {
-       /* Not currently used */
+       /* Reset the RFCOMM channel structures, to invalidate any confiured RFCOMM channels */
+       for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
+         RFCOMM_Channels[i].DLCI = 0x00;
 }
 
 void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
@@ -122,10 +128,27 @@ static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluet
        BT_RFCOMM_DEBUG(1, "<< SABM Received");
        BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
        
-       // TODO: Reset channel send/receive state
+       /* 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];
        
-       BT_RFCOMM_DEBUG(1, ">> UA Sent");
-       RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
+               /* If the channel's DLCI is zero, the channel state entry is free */
+               if (!(CurrRFCOMMChannel->DLCI))
+               {
+                       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;
+               }
+       }
+
+       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)
@@ -152,6 +175,8 @@ static void RFCOMM_ProcessUIH(const RFCOMM_Address_t* const FrameAddress, const
 
 static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader, Bluetooth_Channel_t* const Channel)
 {
+       const uint8_t* CommandData = (const uint8_t*)Data + sizeof(RFCOMM_Command_t);
+
        switch (CommandHeader->Command)
        {
                case RFCOMM_Control_Test:
@@ -174,7 +199,16 @@ static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader,
                        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");                       
+
                        struct
                        {
                                RFCOMM_Command_t Header;
@@ -193,8 +227,6 @@ static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader,
 
                        RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(RFCOMM_Command_t), &Response, Channel);                   
                        break;
-               default:
-                       BT_RFCOMM_DEBUG(1, "<< Unknown Command");                       
        }
 }
 
@@ -233,6 +265,7 @@ static void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, con
        /* 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);
        
@@ -264,3 +297,15 @@ static uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos)
        return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);
 }
 
+RFCOMM_Channel_t RFCOMM_GetChannelData(const uint8_t DLCI)
+{
+       for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
+       {
+               RFCOMM_Channel_t* CurrRFCOMMChannel = RFCOMM_Channels[i];
+       
+               if (CurrRFCOMMChannel->DLCI == DLCI)
+                 return CurrRFCOMMChannel;
+       }
+       
+       return NULL;
+}

diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h
index 8d44c18..69cab49 100644 (file)
--- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h
+++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h
@@ -55,6 +55,8 @@
                #define FRAME_POLL_FINAL                        (1 << 4)
                
                #define RFCOMM_CONTROL_DLCI                     0
+               
+               #define RFCOMM_MAX_OPEN_CHANNELS                5
        
        /* Enums: */
                /** Enum for the types of RFCOMM frames which can be exchanged on a Bluetooth channel. */
@@ -98,7 +100,13 @@
                        unsigned char EA      : 1;
                        unsigned char CR      : 1;
                        unsigned char Command : 6;
-               } RFCOMM_Command_t;             
+               } RFCOMM_Command_t;
+               
+               typedef struct
+               {
+                       uint8_t DLCI;
+                       bool    Configured;
+               } RFCOMM_Channel_t;
 
        /* Function Prototypes: */
                void RFCOMM_Initialize(void);
@@ -116,8 +124,11 @@
                        
                        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);
+                       
                        static uint8_t  RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length);
                        static uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos);
+
+                       RFCOMM_Channel_t RFCOMM_GetChannelData(const uint8_t DLCI);
                #endif
                
 #endif