diff options
Diffstat (limited to 'Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c')
-rw-r--r-- | Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c | 44 |
1 files changed, 29 insertions, 15 deletions
diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c index 5968a6929..6634863f0 100644 --- 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); |