Make XPLAINBridge serial bridge much more reliable for the reception of characters...

[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 46cc182..7c39cb0 100644 (file)
--- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
+++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
@@ -61,19 +61,23 @@ const uint8_t CRC8_Table[256] PROGMEM =
                0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
        };
 
                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)
 {
 /** 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].State = RFCOMM_Channel_Closed;

 }
 
 void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
 {
        const RFCOMM_Header_t* FrameHeader  = (const RFCOMM_Header_t*)Data;
        const uint8_t*         FrameData    = (const uint8_t*)Data + sizeof(RFCOMM_Header_t);
 }
 
 void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
 {
        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);
-
-       FrameData += (FrameDataLen < 128) ? 1 : 2;
+       uint16_t               FrameDataLen = RFCOMM_GetVariableFieldValue(&FrameData);

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


@@ -99,104 +103,47 @@ 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)
-{
-       BT_RFCOMM_DEBUG(1, "<< DM Received");
-       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
-}
-
-static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+RFCOMM_Channel_t* RFCOMM_GetChannelData(const uint8_t DLCI)

 {
 {

-       BT_RFCOMM_DEBUG(1, "<< DISC Received");
-       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
-
-       // TODO: Close down connection
-
-       BT_RFCOMM_DEBUG(1, ">> UA Sent");
-       RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
-}
-
-static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
-{
-       BT_RFCOMM_DEBUG(1, "<< SABM Received");
-       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
-       
-       // TODO: Reset channel send/receive state
+       /* Search through the RFCOMM channel list, looking for the specified channel */
+       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 current non-closed channel's DLCI matches the search DLCI, return it to the caller */
+               if ((CurrRFCOMMChannel->DLCI == DLCI) && (CurrRFCOMMChannel->State != RFCOMM_Channel_Closed))
+                 return CurrRFCOMMChannel;
+       }

 
 

-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);
+       /* Channel not found in the channel state table, return failure */
+       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)
+uint16_t RFCOMM_GetVariableFieldValue(const uint8_t** BufferPos)

 {
 {

-       BT_RFCOMM_DEBUG(1, "<< UIH Received");
-       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
-       BT_RFCOMM_DEBUG(2, "-- Length 0x%02X", FrameLength);
+       uint8_t FirstOctet;
+       uint8_t SecondOctet = 0;

        
        

-       if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
+       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))

        {
        {

-               RFCOMM_ProcessControlCommand((const RFCOMM_Command_t*)FrameData, Channel);
-               return;
-       }
+               SecondOctet = **BufferPos;
+               (*BufferPos)++;

 
 

-       // TODO: Handle regular channel data here
-}
-
-static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader, Bluetooth_Channel_t* const Channel)
-{
-       switch (CommandHeader->Command)
-       {
-               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");
-                       
-                       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)++;

        }
        }

+
+       /* Bitshift 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 Channel)

 {
        struct
        {
 {
        struct
        {


@@ -230,6 +177,7 @@ 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);
 
        /* 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);
        
        if ((Control & ~FRAME_POLL_FINAL) != RFCOMM_Frame_UIH)
          CRCLength += sizeof(ResponsePacket.Size);
        


@@ -242,23 +190,92 @@ static void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, con
 
 static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length)
 {
 
 static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length)
 {

-       const uint8_t* CurrPos = FrameStart;
-       uint8_t        FCS     = 0xFF;
+       uint8_t FCS = 0xFF;

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

-         FCS = pgm_read_byte(&CRC8_Table[FCS ^ *(CurrPos++)]);
+         FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((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 Channel)

 {
 {

-       uint8_t FirstOctet  = BufferPos[0];
-       uint8_t SecondOctet = 0;
+       BT_RFCOMM_DEBUG(1, "<< DM Received");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+}
+
+static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+{
+       BT_RFCOMM_DEBUG(1, "<< DISC Received");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+
+       RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);

        
        

-       if (!(FirstOctet & 0x01))
-         SecondOctet = BufferPos[1];
+       /* If the requested channel is currently open, destroy it */
+       if (RFCOMMChannel != NULL)
+         RFCOMMChannel->DLCI = 0x00;
+
+       BT_RFCOMM_DEBUG(1, ">> UA Sent");
+       RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
+}
+
+static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+{
+       BT_RFCOMM_DEBUG(1, "<< SABM Received");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);

        
        

-       return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);
+       /* 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))
+               {
+                       CurrRFCOMMChannel->DLCI     = FrameAddress->DLCI;
+                       CurrRFCOMMChannel->State    = RFCOMM_Channel_Open;
+                       CurrRFCOMMChannel->Priority = 7 + (CurrRFCOMMChannel->DLCI >> 3) + ((CurrRFCOMMChannel->DLCI >> 3) * 7);
+                       CurrRFCOMMChannel->MTU      = 0xFFFF;
+                       CurrRFCOMMChannel->Remote.Signals     = 0 | (1 << 0);
+                       CurrRFCOMMChannel->Remote.BreakSignal = 0 | (1 << 0);
+                       CurrRFCOMMChannel->Local.Signals      = RFCOMM_SIGNAL_RTC | RFCOMM_SIGNAL_RTR | RFCOMM_SIGNAL_DV | (1 << 0);
+                       CurrRFCOMMChannel->Local.BreakSignal  = 0 | (1 << 0);
+               
+                       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)
+{
+       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 Channel)
+{
+       if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
+       {
+               RFCOMM_ProcessControlCommand(FrameData, Channel);
+               return;
+       }
+
+       BT_RFCOMM_DEBUG(1, "<< UIH Received");
+       BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+       BT_RFCOMM_DEBUG(2, "-- Length 0x%02X", FrameLength);
+               
+       puts("RFCOMM Data: ");
+       
+       for (uint8_t i = 0; i < FrameLength; i++)
+         printf("0x%02X (%c) ", FrameData[i], FrameData[i]);
+       
+       printf("\r\n");
+}