/*
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
RFCOMM_Channel_t RFCOMM_Channels[RFCOMM_MAX_OPEN_CHANNELS];
-/** Initializes the RFCOMM service, ready for new connections from a SDP client. */
+/** Initialises the RFCOMM service, ready for new connections from a SDP client. */
void RFCOMM_Initialize(void)
{
- /* Reset the RFCOMM channel structures, to invalidate any confiured RFCOMM channels */
+ /* 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;
}
-void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
+/** 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);
+ }
+ }
+ }
+}
+
+/** 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 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_DM:
- RFCOMM_ProcessDM(&FrameHeader->Address, Channel);
+ RFCOMM_ProcessDM(&FrameHeader->Address, ACLChannel);
break;
case RFCOMM_Frame_DISC:
- RFCOMM_ProcessDISC(&FrameHeader->Address, Channel);
+ RFCOMM_ProcessDISC(&FrameHeader->Address, ACLChannel);
break;
case RFCOMM_Frame_SABM:
- RFCOMM_ProcessSABM(&FrameHeader->Address, Channel);
+ RFCOMM_ProcessSABM(&FrameHeader->Address, ACLChannel);
break;
case RFCOMM_Frame_UA:
- RFCOMM_ProcessUA(&FrameHeader->Address, Channel);
+ RFCOMM_ProcessUA(&FrameHeader->Address, ACLChannel);
break;
case RFCOMM_Frame_UIH:
- RFCOMM_ProcessUIH(&FrameHeader->Address, FrameDataLen, FrameData, Channel);
+ RFCOMM_ProcessUIH(&FrameHeader->Address, FrameDataLen, FrameData, ACLChannel);
break;
default:
BT_RFCOMM_DEBUG(1, "<< Unknown Frame Received");
}
}
+/** 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->DLCI == DLCI) && (CurrRFCOMMChannel->State != RFCOMM_Channel_Closed))
+ if ((CurrRFCOMMChannel->State != RFCOMM_Channel_Closed) && (CurrRFCOMMChannel->DLCI == DLCI))
return CurrRFCOMMChannel;
}
{
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))
{
(*BufferPos)++;
}
- /* Bitshift the bytes that comprise the variable length field so that they form a single integer */
+ /* 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 Channel)
+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)
{
struct
{
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,
- };
-
+ 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 uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length)
+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]]);
+ FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((const uint8_t*)FrameStart)[i]]);
return ~FCS;
}
-static void RFCOMM_ProcessDM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+static void RFCOMM_ProcessDM(const RFCOMM_Address_t* const FrameAddress,
+ Bluetooth_Channel_t* const ACLChannel)
{
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)
+static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress,
+ Bluetooth_Channel_t* const ACLChannel)
{
BT_RFCOMM_DEBUG(1, "<< DISC Received");
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->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);
+ RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, ACLChannel);
}
-static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress,
+ Bluetooth_Channel_t* const ACLChannel)
{
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->MTU = 0xFFFF;
- CurrRFCOMMChannel->Signals = 0;
- CurrRFCOMMChannel->BreakSignals = 0;
-
- 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, ">> 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;
}
- 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");
- /* 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);
+ /* 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 void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+static void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress,
+ Bluetooth_Channel_t* const ACLChannel)
{
BT_RFCOMM_DEBUG(1, "<< UA Received");
BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
}
-static void RFCOMM_ProcessUIH(const RFCOMM_Address_t* const FrameAddress, const uint16_t FrameLength,
- const uint8_t* FrameData, 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 ACLChannel)
{
if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
{
- RFCOMM_ProcessControlCommand(FrameData, Channel);
+ 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);
-
- puts("RFCOMM Data: ");
-
- for (uint8_t i = 0; i < FrameLength; i++)
- printf("0x%02X (%c) ", FrameData[i], FrameData[i]);
-
- printf("\r\n");
+
+ RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);
+
+ if (RFCOMMChannel != NULL)
+ RFCOMM_DataReceived(RFCOMMChannel, FrameLength, FrameData);
}
+
projects / pub / USBasp.git / blobdiff