/*
LUFA Library
Copyright (C) Dean Camera, 2010.
-
+
dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
+ www.lufa-lib.org
*/
/*
Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
- Permission to use, copy, modify, distribute, and sell this
+ Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
- without fee, provided that the above copyright notice appear in
+ without fee, provided that the above copyright notice appear in
all copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
The author disclaim all warranties with regard to this
0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
};
-/** Initializes the RFCOMM service, ready for new connections from a SDP client. */
+/** RFCOMM channel state structure, to retain information about each open channel in the RFCOMM multiplexer. */
+RFCOMM_Channel_t RFCOMM_Channels[RFCOMM_MAX_OPEN_CHANNELS];
+
+
+/** Initialises 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 configured RFCOMM channels */
+ for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
+ RFCOMM_Channels[i].State = RFCOMM_Channel_Closed;
+}
+
+/** Services all the logical RFCOMM channels on the given ACL channel, sending any RFCOMM control requests to
+ * the remote device as needed to establish new logical RFCOMM channels. This function should be called repeatedly
+ * in the main program loop when an ACL channel with an RFCOMM PSM has been established between the local and remote
+ * device.
+ *
+ * \param[in] ACLChannel ACL channel which has been previously opened to handle RFCOMM traffic between devices
+ */
+void RFCOMM_ServiceChannels(Bluetooth_Channel_t* const ACLChannel)
+{
+ /* Abort if the RFCOMM ACL channel is not currently open */
+ if ((ACLChannel == NULL) || (ACLChannel->State != BT_Channel_Open))
+ return;
+
+ /* Loop through each of the RFCOMM channels, send any required RFCOMM control commands */
+ 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, ACLChannel);
+ }
+
+ /* 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;
+ RFCOMM_ChannelOpened(RFCOMMChannel);
+ }
+ }
+ }
}
-void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
+/** Processes an incoming RFCOMM packet on an ACL channel which has been previously opened between the local and
+ * a remote device to handle RFCOMM traffic.
+ *
+ * \param[in] Data Incoming packet data containing the RFCOMM packet
+ * \param[in] ACLChannel ACL channel the request was issued to by the remote device
+ */
+void RFCOMM_ProcessPacket(void* Data,
+ Bluetooth_Channel_t* const ACLChannel)
{
- 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_GetVariableFieldValue(&FrameData);
+
/* 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, ACLChannel);
break;
case RFCOMM_Frame_DISC:
- RFCOMM_ProcessDISC(FrameHeader, Channel);
+ RFCOMM_ProcessDISC(&FrameHeader->Address, ACLChannel);
+ break;
+ case RFCOMM_Frame_SABM:
+ RFCOMM_ProcessSABM(&FrameHeader->Address, ACLChannel);
+ break;
+ case RFCOMM_Frame_UA:
+ RFCOMM_ProcessUA(&FrameHeader->Address, ACLChannel);
break;
case RFCOMM_Frame_UIH:
- RFCOMM_ProcessUIH(FrameHeader, Channel);
+ RFCOMM_ProcessUIH(&FrameHeader->Address, FrameDataLen, FrameData, ACLChannel);
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)
+/** Sends an RFCOMM notification to the remote device that the local terminal control signals (located in the
+ * "Local" structure of the RFCOMM channel) have changed, pushing the new signals to the remote device.
+ *
+ * \param[in] RFCOMMChannel RFCOMM logical channel whose local terminal signals have changed
+ * \param[in] ACLChannel ACL channel which has been opened to carry RFCOMM traffic between devices
+ */
+void RFCOMM_SendChannelSignals(const RFCOMM_Channel_t* const RFCOMMChannel,
+ Bluetooth_Channel_t* const ACLChannel)
+{
+ 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, ACLChannel);
+}
+
+/** Sends new data through an open logical RFCOMM channel. This should be used to transmit data through a
+ * RFCOMM channel once it has been opened.
+ *
+ * \param[in] DataLen Length of the RFCOMM data to send, in bytes
+ * \param[in] Data Pointer to a buffer where the data to send is located
+ * \param[in] RFCOMMChannel RFCOMM logical channel which is to be transmitted to
+ * \param[in] ACLChannel ACL channel which has been opened to carry RFCOMM traffic between devices
+ */
+void RFCOMM_SendData(const uint16_t DataLen,
+ const uint8_t* Data,
+ const RFCOMM_Channel_t* const RFCOMMChannel,
+ Bluetooth_Channel_t* const ACLChannel)
+{
+ if (RFCOMMChannel->State != RFCOMM_Channel_Open)
+ return;
+
+ BT_RFCOMM_DEBUG(1, ">> UIH Frame");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", RFCOMMChannel->DLCI);
+
+ /* Send the MSC command to the remote device */
+ RFCOMM_SendFrame(RFCOMMChannel->DLCI, false, RFCOMM_Frame_UIH, DataLen, Data, ACLChannel);
+}
+
+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 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_GetVariableFieldValue(const uint8_t** BufferPos)
+{
+ uint8_t FirstOctet;
+ uint8_t SecondOctet = 0;
+
+ 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)++;
+ }
+
+ /* Bit-shift the bytes that comprise the variable length field so that they form a single integer */
+ return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);
+}
+
+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 ACLChannel)
{
- 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 Size[(DataLen < 128) ? 1 : 2];
+ uint8_t Data[DataLen];
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;
-
- /* 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));
-
- BT_RFCOMM_DEBUG(1, ">> UA Sent");
+
+ /* Set the frame header values to the specified address and frame type */
+ ResponsePacket.FrameHeader.Control = Control;
+ 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);
+
+ /* 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);
+
+ /* 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);
+
+ /* 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);
+ Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), ACLChannel);
}
-static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
+static uint8_t RFCOMM_GetFCSValue(const void* FrameStart,
+ uint8_t Length)
{
- const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
+ uint8_t FCS = 0xFF;
- BT_RFCOMM_DEBUG(1, "<< UA Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
+ /* 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 ^ ((const uint8_t*)FrameStart)[i]]);
+
+ return ~FCS;
}
-static void RFCOMM_ProcessDM(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 ACLChannel)
{
- 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);
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
}
-static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
+static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress,
+ Bluetooth_Channel_t* const ACLChannel)
{
- 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", FrameAddress->DLCI);
+
+ RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);
+
+ /* If the requested channel is currently open, destroy it */
+ if (RFCOMMChannel != NULL)
+ RFCOMMChannel->State = RFCOMM_Channel_Closed;
+
+ BT_RFCOMM_DEBUG(1, ">> UA Sent");
+ RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, ACLChannel);
}
-static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
+static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress,
+ Bluetooth_Channel_t* const ACLChannel)
{
- const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
+ BT_RFCOMM_DEBUG(1, "<< SABM Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
- BT_RFCOMM_DEBUG(1, "<< UIH Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
+ if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
+ {
+ 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, ACLChannel);
+
+ return;
+ }
+
+ /* 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, ACLChannel);
+ }
+ 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, ACLChannel);
+ }
}
-static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint16_t Length)
+static void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress,
+ Bluetooth_Channel_t* const ACLChannel)
{
- const uint8_t* CurrPos = FrameStart;
- uint8_t FCS = 0xFF;
-
- while (Length--)
- FCS = pgm_read_byte(CRC8_Table[FCS ^ *(CurrPos++)]);
-
- return ~FCS;
+ BT_RFCOMM_DEBUG(1, "<< UA Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
}
-static uint16_t RFCOMM_GetFrameDataLength(const uint8_t** BufferPos)
+static void RFCOMM_ProcessUIH(const RFCOMM_Address_t* const FrameAddress,
+ const uint16_t FrameLength,
+ const uint8_t* FrameData,
+ Bluetooth_Channel_t* const ACLChannel)
{
- uint8_t FirstOctet = *((*BufferPos)++);
- uint8_t SecondOctet = 0;
-
- if (!(FirstOctet & 0x01))
- SecondOctet = *((*BufferPos)++);
-
- return (((uint16_t)SecondOctet << 7) | (FirstOctet >> 1));
+ if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
+ {
+ RFCOMM_ProcessControlCommand(FrameData, ACLChannel);
+ return;
+ }
+
+ BT_RFCOMM_DEBUG(1, "<< UIH Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+ BT_RFCOMM_DEBUG(2, "-- Length 0x%02X", FrameLength);
+
+ RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);
+
+ if (RFCOMMChannel != NULL)
+ RFCOMM_DataReceived(RFCOMMChannel, FrameLength, FrameData);
}
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