X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/3125fd5f4fe79b6acc89aea9f51b159db2dfd3ff..35b7946950e178c5ba51b87ef16e8a927239fda4:/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 5968a6929..e0446c0e7 100644 --- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c +++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c @@ -73,14 +73,37 @@ void RFCOMM_Initialize(void) RFCOMM_Channels[i].State = RFCOMM_Channel_Closed; } +void RFCOMM_ServiceChannels(Bluetooth_Channel_t* const BluetoothChannel) +{ + for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++) + { + RFCOMM_Channel_t* RFCOMMChannel = &RFCOMM_Channels[i]; + + if (RFCOMMChannel->State == RFCOMM_Channel_Configure) + { + /* Check if the local signals have not yet been sent on the current channel */ + if (!(RFCOMMChannel->ConfigFlags & RFCOMM_CONFIG_LOCALSIGNALSSENT)) + { + /* Indicate that the local signals have been sent, transmit them to the remote device */ + RFCOMMChannel->ConfigFlags |= RFCOMM_CONFIG_LOCALSIGNALSSENT; + RFCOMM_SendChannelSignals(RFCOMMChannel, BluetoothChannel); + } + + /* If signals have been configured in both directions, progress to the open state */ + if ((RFCOMMChannel->ConfigFlags & (RFCOMM_CONFIG_REMOTESIGNALS | RFCOMM_CONFIG_LOCALSIGNALS)) == + (RFCOMM_CONFIG_REMOTESIGNALS | RFCOMM_CONFIG_LOCALSIGNALS)) + { + RFCOMMChannel->State = RFCOMM_Channel_Open; + } + } + } +} + 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) @@ -106,27 +129,96 @@ void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel) } } +RFCOMM_Channel_t* RFCOMM_OpenChannel(Bluetooth_Channel_t* const BluetoothChannel) +{ + return NULL; +} + +void RFCOMM_SendChannelSignals(const RFCOMM_Channel_t* const RFCOMMChannel, Bluetooth_Channel_t* const BluetoothChannel) +{ + BT_RFCOMM_DEBUG(1, ">> MSC Command"); + BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", RFCOMMChannel->DLCI); + + struct + { + RFCOMM_Command_t CommandHeader; + uint8_t Length; + RFCOMM_MSC_Parameters_t Params; + } MSCommand; + + MSCommand.CommandHeader = (RFCOMM_Command_t){.Command = RFCOMM_Control_ModemStatus, .EA = true, .CR = true}; + MSCommand.Length = (sizeof(MSCommand.Params) << 1) | 0x01; + MSCommand.Params.Channel = (RFCOMM_Address_t){.DLCI = RFCOMMChannel->DLCI, .EA = true, .CR = true}; + MSCommand.Params.Signals = RFCOMMChannel->Local.Signals; + MSCommand.Params.BreakSignal = RFCOMMChannel->Local.BreakSignal; + + /* Send the MSC command to the remote device */ + RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, true, RFCOMM_Frame_UIH, sizeof(MSCommand), &MSCommand, BluetoothChannel); +} + +RFCOMM_Channel_t* RFCOMM_GetFreeChannelEntry(const uint8_t DLCI) +{ + /* 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* RFCOMMChannel = &RFCOMM_Channels[i]; + + /* If the channel's state is closed, the channel state entry is free */ + if (RFCOMMChannel->State == RFCOMM_Channel_Closed) + { + RFCOMMChannel->DLCI = DLCI; + RFCOMMChannel->State = RFCOMM_Channel_Configure; + RFCOMMChannel->Priority = 7 + (RFCOMMChannel->DLCI & 0xF8); + RFCOMMChannel->MTU = 0xFFFF; + RFCOMMChannel->Remote.Signals = 0 | (1 << 0); + RFCOMMChannel->Remote.BreakSignal = 0 | (1 << 0); + RFCOMMChannel->Local.Signals = RFCOMM_SIGNAL_RTC | RFCOMM_SIGNAL_RTR | RFCOMM_SIGNAL_DV | (1 << 0); + RFCOMMChannel->Local.BreakSignal = 0 | (1 << 0); + RFCOMMChannel->ConfigFlags = 0; + + return RFCOMMChannel; + } + } + + return NULL; +} + 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->State != RFCOMM_Channel_Closed) && (CurrRFCOMMChannel->DLCI == DLCI)) 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); } @@ -143,12 +235,7 @@ void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, const uint /* 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, - }; + ResponsePacket.FrameHeader.Address = (RFCOMM_Address_t){.DLCI = DLCI, .EA = true, .CR = CommandResponse}; /* Set the lower 7 bits of the packet length */ ResponsePacket.Size[0] = (DataLen << 1); @@ -180,6 +267,7 @@ static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length) { uint8_t FCS = 0xFF; + /* Calculate new Frame CRC value via the given data bytes and the CRC table */ for (uint8_t i = 0; i < Length; i++) FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((uint8_t*)FrameStart)[i]]); @@ -201,7 +289,7 @@ static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress, Bluet /* If the requested channel is currently open, destroy it */ if (RFCOMMChannel != NULL) - RFCOMMChannel->DLCI = 0x00; + RFCOMMChannel->State = RFCOMM_Channel_Closed; BT_RFCOMM_DEBUG(1, ">> UA Sent"); RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel); @@ -211,31 +299,39 @@ 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); - - /* Find a free entry in the RFCOMM channel multiplexer state array */ - for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++) + + if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI) { - RFCOMM_Channel_t* CurrRFCOMMChannel = &RFCOMM_Channels[i]; - - /* 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; + BT_RFCOMM_DEBUG(1, ">> UA Sent"); - BT_RFCOMM_DEBUG(1, ">> UA Sent"); - RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel); - return; - } + /* Free channel found, or request was to the control channel - accept SABM by sending a UA frame */ + RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel); + + return; } - BT_RFCOMM_DEBUG(1, ">> DM Sent"); + /* Find the existing channel's entry in the channel table */ + RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI); + + /* Existing entry not found, create a new entry for the channel */ + if (RFCOMMChannel == NULL) + RFCOMMChannel = RFCOMM_GetFreeChannelEntry(FrameAddress->DLCI); + + /* If space was found in the channel table for the new channel, ACK the request */ + if (RFCOMMChannel != NULL) + { + BT_RFCOMM_DEBUG(1, ">> UA Sent"); + + /* Free channel found, or request was to the control channel - accept SABM by sending a UA frame */ + RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel); + } + else + { + 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); + /* 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)