diff options
Diffstat (limited to 'Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c')
| -rw-r--r-- | Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c | 417 |
1 files changed, 0 insertions, 417 deletions
diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c deleted file mode 100644 index c6b7f097c..000000000 --- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c +++ /dev/null @@ -1,417 +0,0 @@ -/* - LUFA Library - Copyright (C) Dean Camera, 2012. - - dean [at] fourwalledcubicle [dot] com - www.lufa-lib.org -*/ - -/* - Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com) - - 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 - 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 - software without specific, written prior permission. - - The author disclaim all warranties with regard to this - software, including all implied warranties of merchantability - and fitness. In no event shall the author be liable for any - special, indirect or consequential damages or any damages - whatsoever resulting from loss of use, data or profits, whether - in an action of contract, negligence or other tortious action, - arising out of or in connection with the use or performance of - this software. -*/ - -/** \file - * - * RFCOMM layer module. This module manages the RFCOMM layer of the - * stack, providing virtual serial port channels on top of the lower - * L2CAP layer. - */ - -#define INCLUDE_FROM_RFCOMM_C -#include "RFCOMM.h" - -/** 8-Bit CRC table used by the FCS field of each RFCOMM encoded frame, sourced from the ETSI TS 101 369 V7.2.0 - * specification document, upon which the RFCOMM specification is based. - */ -const uint8_t CRC8_Table[256] PROGMEM = - { - 0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B, - 0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67, - 0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43, - 0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F, - 0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B, - 0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17, - 0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33, - 0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F, - 0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B, - 0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87, - 0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3, - 0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF, - 0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB, - 0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7, - 0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3, - 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) -{ - /* 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); - } - } - } -} - -/** 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, ACLChannel); - break; - case RFCOMM_Frame_DISC: - 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->Address, FrameDataLen, FrameData, ACLChannel); - break; - default: - BT_RFCOMM_DEBUG(1, "<< Unknown Frame Received"); - break; - } -} - -/** 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) -{ - struct - { - RFCOMM_Header_t FrameHeader; - uint8_t Size[(DataLen < 128) ? 1 : 2]; - 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){.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), ACLChannel); -} - -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 ^ ((const uint8_t*)FrameStart)[i]]); - - return ~FCS; -} - -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 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->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_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); - - 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 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 ACLChannel) -{ - 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); -} - |