diff options
| -rw-r--r-- | Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c | 57 | ||||
| -rw-r--r-- | Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h | 13 |
2 files changed, 63 insertions, 7 deletions
diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c index 75fe17b08..8e533ac72 100644 --- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c +++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c @@ -61,10 +61,16 @@ const uint8_t CRC8_Table[256] PROGMEM = 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) { - /* 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].DLCI = 0x00; } void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel) @@ -122,10 +128,27 @@ 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); - // TODO: Reset channel send/receive state + /* 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]; - BT_RFCOMM_DEBUG(1, ">> UA Sent"); - RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel); + /* If the channel's DLCI is zero, the channel state entry is free */ + if (!(CurrRFCOMMChannel->DLCI)) + { + CurrRFCOMMChannel->DLCI = FrameAddress->DLCI; + CurrRFCOMMChannel->Configured = false; + + 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) @@ -152,6 +175,8 @@ static void RFCOMM_ProcessUIH(const RFCOMM_Address_t* const FrameAddress, const static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader, Bluetooth_Channel_t* const Channel) { + const uint8_t* CommandData = (const uint8_t*)Data + sizeof(RFCOMM_Command_t); + switch (CommandHeader->Command) { case RFCOMM_Control_Test: @@ -174,7 +199,16 @@ static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader, break; case RFCOMM_Control_DLCParameterNegotiation: BT_RFCOMM_DEBUG(1, "<< DPN Command"); + + // TODO - Set channel state +// RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData( + RFCOMMChannel->Configured = true; + // TODO - send ACK/NAK response + break; + default: + BT_RFCOMM_DEBUG(1, "<< Unknown Command"); + struct { RFCOMM_Command_t Header; @@ -193,8 +227,6 @@ static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader, RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(RFCOMM_Command_t), &Response, Channel); break; - default: - BT_RFCOMM_DEBUG(1, "<< Unknown Command"); } } @@ -233,6 +265,7 @@ 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); + /* 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); @@ -264,3 +297,15 @@ static uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos) return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1); } +RFCOMM_Channel_t RFCOMM_GetChannelData(const uint8_t DLCI) +{ + for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++) + { + RFCOMM_Channel_t* CurrRFCOMMChannel = RFCOMM_Channels[i]; + + if (CurrRFCOMMChannel->DLCI == DLCI) + return CurrRFCOMMChannel; + } + + return NULL; +} diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h index 8d44c1815..69cab4944 100644 --- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h +++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h @@ -55,6 +55,8 @@ #define FRAME_POLL_FINAL (1 << 4) #define RFCOMM_CONTROL_DLCI 0 + + #define RFCOMM_MAX_OPEN_CHANNELS 5 /* Enums: */ /** Enum for the types of RFCOMM frames which can be exchanged on a Bluetooth channel. */ @@ -98,7 +100,13 @@ unsigned char EA : 1; unsigned char CR : 1; unsigned char Command : 6; - } RFCOMM_Command_t; + } RFCOMM_Command_t; + + typedef struct + { + uint8_t DLCI; + bool Configured; + } RFCOMM_Channel_t; /* Function Prototypes: */ void RFCOMM_Initialize(void); @@ -116,8 +124,11 @@ 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); + static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length); static uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos); + + RFCOMM_Channel_t RFCOMM_GetChannelData(const uint8_t DLCI); #endif #endif |