diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c index e69a27e4ed..5a7edc2a8f 100644 --- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c +++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c @@ -74,18 +74,18 @@ void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel) /* 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); break; case RFCOMM_Frame_DISC: RFCOMM_ProcessDISC(FrameHeader, Channel); break; + case RFCOMM_Frame_SABM: + RFCOMM_ProcessSABM(FrameHeader, Channel); + break; + case RFCOMM_Frame_UA: + RFCOMM_ProcessUA(FrameHeader, Channel); + break; case RFCOMM_Frame_UIH: RFCOMM_ProcessUIH(FrameHeader, Channel); break; @@ -95,12 +95,29 @@ void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel) } } +static void RFCOMM_ProcessDM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel) +{ + BT_RFCOMM_DEBUG(1, "<< DM Received"); + BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameHeader->Address.DLCI); +} + +static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel) +{ + BT_RFCOMM_DEBUG(1, "<< DISC Received"); + BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameHeader->Address.DLCI); + + // TODO: Close down connection + + BT_RFCOMM_DEBUG(1, ">> UA Sent"); + RFCOMM_SendFrame(FrameHeader->Address.DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel); +} + static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel) { BT_RFCOMM_DEBUG(1, "<< SABM Received"); BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameHeader->Address.DLCI); - // TODO: Reset channel send/receive state here + // TODO: Reset channel send/receive state BT_RFCOMM_DEBUG(1, ">> UA Sent"); RFCOMM_SendFrame(FrameHeader->Address.DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel); @@ -108,34 +125,25 @@ static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, Bluetoo static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, 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); -} - -static void RFCOMM_ProcessDM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel) -{ - const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t)); - - BT_RFCOMM_DEBUG(1, "<< DM Received"); - BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address); -} - -static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel) -{ - const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t)); - - BT_RFCOMM_DEBUG(1, "<< DISC Received"); - BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address); + BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameHeader->Address.DLCI); } static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, 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, "-- Address 0x%02X", FrameHeader->Address); + BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameHeader->Address.DLCI); + + uint8_t* FrameData = (uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t); + uint16_t FrameDataLen = RFCOMM_GetFrameDataLength(FrameData); + FrameData += (FrameDataLen < 128) ? 1 : 2; + + BT_RFCOMM_DEBUG(2, "-- Length 0x%02X", FrameDataLen); + + if (FrameHeader->Address.DLCI == RFCOMM_CONTROL_DLCI) + { + // TODO: Process control command + } } static void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, const uint8_t Control, const uint16_t DataLen, const uint8_t* Data, @@ -170,38 +178,38 @@ static void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, con /* 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); + + if ((Control & ~FRAME_POLL_FINAL) != RFCOMM_Frame_UIH) + CRCLength += sizeof(ResponsePacket.Size); + /* Calculate the frame checksum from the appropriate fields */ - if ((Control & ~FRAME_POLL_FINAL) == RFCOMM_Frame_UIH) - ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, sizeof(ResponsePacket.FrameHeader)); - else - ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, sizeof(ResponsePacket.FrameHeader) + sizeof(ResponsePacket.Size)); + 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]); - CurrPos++; - } + for (uint8_t i = 0; i < Length; i++) + FCS = pgm_read_byte(&CRC8_Table[FCS ^ *(CurrPos++)]); - return (0xFF - FCS); + 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); } diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h index d25b7370f1..3f7887fede 100644 --- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h +++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h @@ -53,17 +53,31 @@ #define RFCOMM_DEBUG_LEVEL 2 #define FRAME_POLL_FINAL (1 << 4) + + #define RFCOMM_CONTROL_DLCI 0 /* Enums: */ /** Enum for the types of RFCOMM frames which can be exchanged on a Bluetooth channel. */ enum RFCOMM_Frame_Types_t { - RFCOMM_Frame_SABM = 0x2F, /**< Set Asynchronous Balance Mode Field */ - RFCOMM_Frame_UA = 0x63, /**< Unnumbered Acknowledgement Field */ RFCOMM_Frame_DM = 0x0F, /**< Disconnected Mode Field */ RFCOMM_Frame_DISC = 0x43, /**< Disconnect Field */ + RFCOMM_Frame_SABM = 0x2F, /**< Set Asynchronous Balance Mode Field */ + RFCOMM_Frame_UA = 0x63, /**< Unnumbered Acknowledgement Field */ RFCOMM_Frame_UIH = 0xEF, /**< Unnumbered Information with Header check Field */ }; + + enum RFCOMM_Control_Commands_t + { + RFCOMM_Control_Test = 0x20; + RFCOMM_Control_FlowControlEnable = 0xA0; + RFCOMM_Control_FlowControlDisable = 0x60; + RFCOMM_Control_ModemStatus = 0xE0; + RFCOMM_Control_RemotePortNegotiation = 0x90; + RFCOMM_Control_RemoteLineStatus = 0x50; + RFCOMM_Control_DLCParameterNegotiation = 0x80; + RFCOMM_Control_NonSupportedCommand = 0x10; + } /* Type Defines: */ typedef struct @@ -84,16 +98,16 @@ void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel); #if defined(INCLUDE_FROM_RFCOMM_C) - static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel); - static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel); static void RFCOMM_ProcessDM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel); static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel); + static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel); + static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel); 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 uint8_t* Data, Bluetooth_Channel_t* const Channel); - static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint16_t Length); - static uint16_t RFCOMM_GetFrameDataLength(const uint8_t** BufferPos); + static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length); + static uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos); #endif #endif