Rename RFCOMM_GetFrameDataLength() to RFCOMM_GetVariableFieldValue() as it is multi...

[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..6634863 100644 (file)
--- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
+++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
@@ -77,10 +77,7 @@ 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)
@@ -108,25 +105,40 @@ void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
 
 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];
        
-               if (CurrRFCOMMChannel->DLCI == DLCI)
+               /* 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;
        }
-       
+
+       /* Channel not found in the channel state table, return failure */
        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;
        
-       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);
 }
 
@@ -220,11 +232,13 @@ static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluet
                /* 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;
+                       CurrRFCOMMChannel->DLCI         = FrameAddress->DLCI;
+                       CurrRFCOMMChannel->State        = RFCOMM_Channel_Open;
+                       CurrRFCOMMChannel->Priority     = 7 + (CurrRFCOMMChannel->DLCI >> 3) + ((CurrRFCOMMChannel->DLCI >> 3) * 7);
+                       CurrRFCOMMChannel->UseUIFrames  = false;
+                       CurrRFCOMMChannel->MTU          = 0xFFFF;
+                       CurrRFCOMMChannel->Signals      = 0;
+                       CurrRFCOMMChannel->BreakSignals = 0;
                
                        BT_RFCOMM_DEBUG(1, ">> UA Sent");
                        RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);