Improve commenting of the Dataflash stub board driver file, to prevent confusion...

[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 5968a69..e0446c0 100644 (file)
--- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
+++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
@@ -73,14 +73,37 @@ void RFCOMM_Initialize(void)
          RFCOMM_Channels[i].State = RFCOMM_Channel_Closed;
 }
 
          RFCOMM_Channels[i].State = RFCOMM_Channel_Closed;
 }
 

+void RFCOMM_ServiceChannels(Bluetooth_Channel_t* const BluetoothChannel)
+{
+       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, BluetoothChannel);
+                       }
+
+                       /* 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;
+                       }
+               }
+       }
+}
+

 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);
-
-       /* Adjust the frame data pointer to skip over the variable size field */
-       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)


@@ -106,27 +129,96 @@ void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
        }
 }
 
        }
 }
 

+RFCOMM_Channel_t* RFCOMM_OpenChannel(Bluetooth_Channel_t* const BluetoothChannel)
+{
+       return NULL;
+}
+
+void RFCOMM_SendChannelSignals(const RFCOMM_Channel_t* const RFCOMMChannel, Bluetooth_Channel_t* const BluetoothChannel)
+{
+       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, BluetoothChannel); 
+}
+
+RFCOMM_Channel_t* RFCOMM_GetFreeChannelEntry(const uint8_t DLCI)
+{
+       /* 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* RFCOMMChannel = &RFCOMM_Channels[i];
+
+               /* If the channel's state is closed, the channel state entry is free */
+               if (RFCOMMChannel->State == RFCOMM_Channel_Closed)
+               {
+                       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;
+               }
+       }
+       
+       return NULL;
+}
+

 RFCOMM_Channel_t* RFCOMM_GetChannelData(const uint8_t DLCI)
 {
 RFCOMM_Channel_t* RFCOMM_GetChannelData(const uint8_t DLCI)
 {

+       /* 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];
        
        for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
        {
                RFCOMM_Channel_t* CurrRFCOMMChannel = &RFCOMM_Channels[i];
        

-               if (CurrRFCOMMChannel->DLCI == DLCI)
+               /* 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;
        }
                  return CurrRFCOMMChannel;
        }

-       
+
+       /* Channel not found in the channel state table, return failure */

        return NULL;
 }
 
        return NULL;
 }
 

-uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos)
+uint16_t RFCOMM_GetVariableFieldValue(const uint8_t** BufferPos)

 {
 {

-       uint8_t FirstOctet  = BufferPos[0];
+       uint8_t FirstOctet;

        uint8_t SecondOctet = 0;
        
        uint8_t SecondOctet = 0;
        

-       if (!(FirstOctet & 0x01))
-         SecondOctet = BufferPos[1];
+       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))
+       {
+               SecondOctet = **BufferPos;
+               (*BufferPos)++;
+
+               /* 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);
 }
 
        return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);
 }
 


@@ -143,12 +235,7 @@ void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, const uint
        
        /* 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);


@@ -180,6 +267,7 @@ 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++)
          FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((uint8_t*)FrameStart)[i]]);
 
        for (uint8_t i = 0; i < Length; i++)
          FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((uint8_t*)FrameStart)[i]]);
 


@@ -201,7 +289,7 @@ static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress, Bluet
        
        /* If the requested channel is currently open, destroy it */
        if (RFCOMMChannel != NULL)
        
        /* If the requested channel is currently open, destroy it */
        if (RFCOMMChannel != NULL)

-         RFCOMMChannel->DLCI = 0x00;
+         RFCOMMChannel->State = RFCOMM_Channel_Closed;

 
        BT_RFCOMM_DEBUG(1, ">> UA Sent");
        RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
 
        BT_RFCOMM_DEBUG(1, ">> UA Sent");
        RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);


@@ -211,31 +299,39 @@ 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);
 {
        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++)
+
+       if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)

        {
        {

-               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->UseUIFrames = false;
-                       CurrRFCOMMChannel->RemoteMTU   = 0xFFFF;
+               BT_RFCOMM_DEBUG(1, ">> UA Sent");

                
                

-                       BT_RFCOMM_DEBUG(1, ">> UA Sent");
-                       RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
-                       return;
-               }
+               /* 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, Channel);
+
+               return;

        }
 
        }
 

-       BT_RFCOMM_DEBUG(1, ">> DM Sent");
+       /* 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, Channel);
+       }
+       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, Channel);
+               /* 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)
 }
 
 static void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)