X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/2dabb4e55f1c362f63ef181469f529867ce8b03b..5ce3f0b17bc927513bd980e8710f588564fe1dcc:/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 a57f3a44d..46cc182ec 100644 --- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c +++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c @@ -69,115 +69,196 @@ void RFCOMM_Initialize(void) void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel) { - const RFCOMM_Header_t* FrameHeader = (const RFCOMM_Header_t*)Data; + 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; /* Decode the RFCOMM frame type from the header */ switch (FrameHeader->Control & ~FRAME_POLL_FINAL) { - case RFCOMM_Frame_SABM: - RFCOMM_ProcessSABM(FrameHeader, Channel); - break; - case RFCOMM_Frame_UA: - RFCOMM_ProcessUA(FrameHeader, Channel); - break; case RFCOMM_Frame_DM: - RFCOMM_ProcessDM(FrameHeader, Channel); + RFCOMM_ProcessDM(&FrameHeader->Address, Channel); break; case RFCOMM_Frame_DISC: - RFCOMM_ProcessDISC(FrameHeader, Channel); + RFCOMM_ProcessDISC(&FrameHeader->Address, Channel); + break; + case RFCOMM_Frame_SABM: + RFCOMM_ProcessSABM(&FrameHeader->Address, Channel); + break; + case RFCOMM_Frame_UA: + RFCOMM_ProcessUA(&FrameHeader->Address, Channel); break; case RFCOMM_Frame_UIH: - RFCOMM_ProcessUIH(FrameHeader, Channel); + RFCOMM_ProcessUIH(&FrameHeader->Address, FrameDataLen, FrameData, Channel); break; default: - BT_RFCOMM_DEBUG(1, "<< Unknown Frame Type"); + BT_RFCOMM_DEBUG(1, "<< Unknown Frame Received"); break; } } -static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, 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) +{ + 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, "-- Address 0x%02X", FrameHeader->Address); - - // TODO: Reset channel send/receive state here - - struct - { - RFCOMM_Header_t FrameHeader; - uint8_t FrameLength; - uint8_t FCS; - } ResponsePacket; - - /* Copy over the same frame header as the sent packet to copy the logical RFCOMM channel address */ - ResponsePacket.FrameHeader.Address = FrameHeader->Address; + BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI); - /* Set the frame type to an Unnumbered Acknowledgement to acknowledge the SABM request */ - ResponsePacket.FrameHeader.Control = RFCOMM_Frame_UA; - - /* Set the length to 0 (LSB indicates end of 8-bit length field) */ - ResponsePacket.FrameLength = 0x01; - - /* Calculate the frame checksum from all fields except the FCS field itself */ - ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, sizeof(ResponsePacket) - sizeof(ResponsePacket.FCS)); + // TODO: Reset channel send/receive state BT_RFCOMM_DEBUG(1, ">> UA Sent"); - - /* Send the completed response packet to the sender */ - Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), Channel); + RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel); } -static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel) +static void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel) { - const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t)); - BT_RFCOMM_DEBUG(1, "<< UA Received"); - BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address); + BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI); } -static void RFCOMM_ProcessDM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel) +static void RFCOMM_ProcessUIH(const RFCOMM_Address_t* const FrameAddress, const uint16_t FrameLength, + const uint8_t* FrameData, Bluetooth_Channel_t* const Channel) { - const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t)); + BT_RFCOMM_DEBUG(1, "<< UIH Received"); + BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI); + BT_RFCOMM_DEBUG(2, "-- Length 0x%02X", FrameLength); + + if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI) + { + RFCOMM_ProcessControlCommand((const RFCOMM_Command_t*)FrameData, Channel); + return; + } - BT_RFCOMM_DEBUG(1, "<< DM Received"); - BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address); + // TODO: Handle regular channel data here } -static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel) +static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader, Bluetooth_Channel_t* const Channel) { - const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t)); + 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, + }; - BT_RFCOMM_DEBUG(1, "<< DISC Received"); - BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address); + RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(RFCOMM_Command_t), &Response, Channel); + break; + } } -static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel) +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) { - const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t)); + struct + { + RFCOMM_Header_t FrameHeader; + uint8_t Size[(DataLen < 128) ? 1 : 2]; + uint8_t Data[DataLen]; + uint8_t FCS; + } ResponsePacket; + + /* 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, + }; + + /* Set the lower 7 bits of the packet length */ + ResponsePacket.Size[0] = (DataLen << 1); + + /* Terminate the size field if size is 7 bits or lower, otherwise set the upper 8 bits of the length */ + if (DataLen < 128) + ResponsePacket.Size[0] |= 0x01; + else + ResponsePacket.Size[1] = (DataLen >> 7); + + /* Copy over the packet data from the source buffer to the response packet buffer */ + memcpy(ResponsePacket.Data, Data, DataLen); + + /* Determine the length of the frame which is to be used to calculate the CRC value */ + uint8_t CRCLength = sizeof(ResponsePacket.FrameHeader); - BT_RFCOMM_DEBUG(1, "<< UIH Received"); - BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address); + if ((Control & ~FRAME_POLL_FINAL) != RFCOMM_Frame_UIH) + CRCLength += sizeof(ResponsePacket.Size); + + /* Calculate the frame checksum from the appropriate fields */ + ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, CRCLength); + + /* Send the completed response packet to the sender */ + Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), Channel); } -static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint16_t Length) +static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length) { const uint8_t* CurrPos = FrameStart; uint8_t FCS = 0xFF; - while (Length--) - FCS = pgm_read_byte(CRC8_Table[FCS ^ *(CurrPos++)]); + for (uint8_t i = 0; i < Length; i++) + FCS = pgm_read_byte(&CRC8_Table[FCS ^ *(CurrPos++)]); return ~FCS; } -static uint16_t RFCOMM_GetFrameDataLength(const uint8_t** BufferPos) +static uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos) { - uint8_t FirstOctet = *((*BufferPos)++); + uint8_t FirstOctet = BufferPos[0]; uint8_t SecondOctet = 0; if (!(FirstOctet & 0x01)) - SecondOctet = *((*BufferPos)++); + SecondOctet = BufferPos[1]; - return (((uint16_t)SecondOctet << 7) | (FirstOctet >> 1)); + return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1); }