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418 lines
16 KiB
418 lines
16 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2011.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* RFCOMM layer module. This module manages the RFCOMM layer of the
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* stack, providing virtual serial port channels on top of the lower
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* L2CAP layer.
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*/
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#define INCLUDE_FROM_RFCOMM_C
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#include "RFCOMM.h"
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/** 8-Bit CRC table used by the FCS field of each RFCOMM encoded frame, sourced from the ETSI TS 101 369 V7.2.0
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* specification document, upon which the RFCOMM specification is based.
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*/
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const uint8_t CRC8_Table[256] PROGMEM =
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{
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0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B,
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0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67,
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0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43,
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0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F,
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0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B,
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0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17,
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0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33,
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0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F,
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0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B,
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0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87,
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0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3,
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0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF,
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0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB,
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0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7,
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0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3,
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0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
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};
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/** RFCOMM channel state structure, to retain information about each open channel in the RFCOMM multiplexer. */
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RFCOMM_Channel_t RFCOMM_Channels[RFCOMM_MAX_OPEN_CHANNELS];
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/** Initializes the RFCOMM service, ready for new connections from a SDP client. */
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void RFCOMM_Initialize(void)
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{
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/* Reset the RFCOMM channel structures, to invalidate any configured RFCOMM channels */
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for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
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RFCOMM_Channels[i].State = RFCOMM_Channel_Closed;
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}
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/** Services all the logical RFCOMM channels on the given ACL channel, sending any RFCOMM control requests to
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* the remote device as needed to establish new logical RFCOMM channels. This function should be called repeatedly
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* in the main program loop when an ACL channel with an RFCOMM PSM has been established between the local and remote
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* device.
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*
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* \param[in] ACLChannel ACL channel which has been previously opened to handle RFCOMM traffic between devices
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*/
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void RFCOMM_ServiceChannels(Bluetooth_Channel_t* const ACLChannel)
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{
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/* Abort if the RFCOMM ACL channel is not currently open */
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if ((ACLChannel == NULL) || (ACLChannel->State != BT_Channel_Open))
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return;
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/* Loop through each of the RFCOMM channels, send any required RFCOMM control commands */
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for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
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{
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RFCOMM_Channel_t* RFCOMMChannel = &RFCOMM_Channels[i];
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if (RFCOMMChannel->State == RFCOMM_Channel_Configure)
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{
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/* Check if the local signals have not yet been sent on the current channel */
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if (!(RFCOMMChannel->ConfigFlags & RFCOMM_CONFIG_LOCALSIGNALSSENT))
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{
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/* Indicate that the local signals have been sent, transmit them to the remote device */
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RFCOMMChannel->ConfigFlags |= RFCOMM_CONFIG_LOCALSIGNALSSENT;
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RFCOMM_SendChannelSignals(RFCOMMChannel, ACLChannel);
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}
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/* If signals have been configured in both directions, progress to the open state */
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if ((RFCOMMChannel->ConfigFlags & (RFCOMM_CONFIG_REMOTESIGNALS | RFCOMM_CONFIG_LOCALSIGNALS)) ==
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(RFCOMM_CONFIG_REMOTESIGNALS | RFCOMM_CONFIG_LOCALSIGNALS))
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{
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RFCOMMChannel->State = RFCOMM_Channel_Open;
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RFCOMM_ChannelOpened(RFCOMMChannel);
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}
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}
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}
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}
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/** Processes an incoming RFCOMM packet on an ACL channel which has been previously opened between the local and
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* a remote device to handle RFCOMM traffic.
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*
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* \param[in] Data Incoming packet data containing the RFCOMM packet
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* \param[in] ACLChannel ACL channel the request was issued to by the remote device
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*/
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void RFCOMM_ProcessPacket(void* Data,
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Bluetooth_Channel_t* const ACLChannel)
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{
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const RFCOMM_Header_t* FrameHeader = (const RFCOMM_Header_t*)Data;
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const uint8_t* FrameData = (const uint8_t*)Data + sizeof(RFCOMM_Header_t);
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uint16_t FrameDataLen = RFCOMM_GetVariableFieldValue(&FrameData);
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/* Decode the RFCOMM frame type from the header */
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switch (FrameHeader->Control & ~FRAME_POLL_FINAL)
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{
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case RFCOMM_Frame_DM:
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RFCOMM_ProcessDM(&FrameHeader->Address, ACLChannel);
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break;
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case RFCOMM_Frame_DISC:
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RFCOMM_ProcessDISC(&FrameHeader->Address, ACLChannel);
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break;
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case RFCOMM_Frame_SABM:
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RFCOMM_ProcessSABM(&FrameHeader->Address, ACLChannel);
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break;
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case RFCOMM_Frame_UA:
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RFCOMM_ProcessUA(&FrameHeader->Address, ACLChannel);
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break;
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case RFCOMM_Frame_UIH:
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RFCOMM_ProcessUIH(&FrameHeader->Address, FrameDataLen, FrameData, ACLChannel);
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break;
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default:
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BT_RFCOMM_DEBUG(1, "<< Unknown Frame Received");
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break;
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}
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}
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/** Sends an RFCOMM notification to the remote device that the local terminal control signals (located in the
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* "Local" structure of the RFCOMM channel) have changed, pushing the new signals to the remote device.
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*
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* \param[in] RFCOMMChannel RFCOMM logical channel whose local terminal signals have changed
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* \param[in] ACLChannel ACL channel which has been opened to carry RFCOMM traffic between devices
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*/
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void RFCOMM_SendChannelSignals(const RFCOMM_Channel_t* const RFCOMMChannel,
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Bluetooth_Channel_t* const ACLChannel)
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{
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BT_RFCOMM_DEBUG(1, ">> MSC Command");
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BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", RFCOMMChannel->DLCI);
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struct
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{
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RFCOMM_Command_t CommandHeader;
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uint8_t Length;
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RFCOMM_MSC_Parameters_t Params;
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} MSCommand;
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MSCommand.CommandHeader = (RFCOMM_Command_t){.Command = RFCOMM_Control_ModemStatus, .EA = true, .CR = true};
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MSCommand.Length = (sizeof(MSCommand.Params) << 1) | 0x01;
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MSCommand.Params.Channel = (RFCOMM_Address_t){.DLCI = RFCOMMChannel->DLCI, .EA = true, .CR = true};
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MSCommand.Params.Signals = RFCOMMChannel->Local.Signals;
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MSCommand.Params.BreakSignal = RFCOMMChannel->Local.BreakSignal;
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/* Send the MSC command to the remote device */
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RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, true, RFCOMM_Frame_UIH, sizeof(MSCommand), &MSCommand, ACLChannel);
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}
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/** Sends new data through an open logical RFCOMM channel. This should be used to transmit data through a
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* RFCOMM channel once it has been opened.
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*
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* \param[in] DataLen Length of the RFCOMM data to send, in bytes
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* \param[in] Data Pointer to a buffer where the data to send is located
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* \param[in] RFCOMMChannel RFCOMM logical channel which is to be transmitted to
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* \param[in] ACLChannel ACL channel which has been opened to carry RFCOMM traffic between devices
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*/
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void RFCOMM_SendData(const uint16_t DataLen,
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const uint8_t* Data,
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const RFCOMM_Channel_t* const RFCOMMChannel,
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Bluetooth_Channel_t* const ACLChannel)
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{
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if (RFCOMMChannel->State != RFCOMM_Channel_Open)
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return;
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BT_RFCOMM_DEBUG(1, ">> UIH Frame");
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BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", RFCOMMChannel->DLCI);
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/* Send the MSC command to the remote device */
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RFCOMM_SendFrame(RFCOMMChannel->DLCI, false, RFCOMM_Frame_UIH, DataLen, Data, ACLChannel);
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}
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RFCOMM_Channel_t* RFCOMM_GetFreeChannelEntry(const uint8_t DLCI)
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{
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/* Find a free entry in the RFCOMM channel multiplexer state array */
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for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
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{
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RFCOMM_Channel_t* RFCOMMChannel = &RFCOMM_Channels[i];
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/* If the channel's state is closed, the channel state entry is free */
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if (RFCOMMChannel->State == RFCOMM_Channel_Closed)
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{
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RFCOMMChannel->DLCI = DLCI;
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RFCOMMChannel->State = RFCOMM_Channel_Configure;
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RFCOMMChannel->Priority = 7 + (RFCOMMChannel->DLCI & 0xF8);
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RFCOMMChannel->MTU = 0xFFFF;
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RFCOMMChannel->Remote.Signals = 0 | (1 << 0);
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RFCOMMChannel->Remote.BreakSignal = 0 | (1 << 0);
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RFCOMMChannel->Local.Signals = RFCOMM_SIGNAL_RTC | RFCOMM_SIGNAL_RTR | RFCOMM_SIGNAL_DV | (1 << 0);
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RFCOMMChannel->Local.BreakSignal = 0 | (1 << 0);
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RFCOMMChannel->ConfigFlags = 0;
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return RFCOMMChannel;
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}
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}
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return NULL;
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}
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RFCOMM_Channel_t* RFCOMM_GetChannelData(const uint8_t DLCI)
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{
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/* Search through the RFCOMM channel list, looking for the specified channel */
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for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
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{
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RFCOMM_Channel_t* CurrRFCOMMChannel = &RFCOMM_Channels[i];
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/* If the current non-closed channel's DLCI matches the search DLCI, return it to the caller */
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if ((CurrRFCOMMChannel->State != RFCOMM_Channel_Closed) && (CurrRFCOMMChannel->DLCI == DLCI))
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return CurrRFCOMMChannel;
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}
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/* Channel not found in the channel state table, return failure */
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return NULL;
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}
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uint16_t RFCOMM_GetVariableFieldValue(const uint8_t** BufferPos)
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{
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uint8_t FirstOctet;
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uint8_t SecondOctet = 0;
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FirstOctet = **BufferPos;
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(*BufferPos)++;
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/* If the field size is more than a single byte, fetch the next byte in the variable length field */
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if (!(FirstOctet & 0x01))
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{
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SecondOctet = **BufferPos;
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(*BufferPos)++;
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/* Discard any remaining bytes in the variable length field that won't fit in the return value */
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while (!(**BufferPos & 0x01))
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(*BufferPos)++;
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}
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/* Bit-shift the bytes that comprise the variable length field so that they form a single integer */
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return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);
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}
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void RFCOMM_SendFrame(const uint8_t DLCI,
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const bool CommandResponse,
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const uint8_t Control,
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const uint16_t DataLen,
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const void* Data,
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Bluetooth_Channel_t* const ACLChannel)
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{
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struct
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{
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RFCOMM_Header_t FrameHeader;
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uint8_t Size[(DataLen < 128) ? 1 : 2];
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uint8_t Data[DataLen];
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uint8_t FCS;
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} ResponsePacket;
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/* Set the frame header values to the specified address and frame type */
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ResponsePacket.FrameHeader.Control = Control;
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ResponsePacket.FrameHeader.Address = (RFCOMM_Address_t){.DLCI = DLCI, .EA = true, .CR = CommandResponse};
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/* Set the lower 7 bits of the packet length */
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ResponsePacket.Size[0] = (DataLen << 1);
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/* Terminate the size field if size is 7 bits or lower, otherwise set the upper 8 bits of the length */
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if (DataLen < 128)
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ResponsePacket.Size[0] |= 0x01;
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else
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ResponsePacket.Size[1] = (DataLen >> 7);
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/* Copy over the packet data from the source buffer to the response packet buffer */
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memcpy(ResponsePacket.Data, Data, DataLen);
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/* Determine the length of the frame which is to be used to calculate the CRC value */
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uint8_t CRCLength = sizeof(ResponsePacket.FrameHeader);
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/* UIH frames do not have the CRC calculated on the Size field in the response, all other frames do */
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if ((Control & ~FRAME_POLL_FINAL) != RFCOMM_Frame_UIH)
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CRCLength += sizeof(ResponsePacket.Size);
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/* Calculate the frame checksum from the appropriate fields */
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ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, CRCLength);
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/* Send the completed response packet to the sender */
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Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), ACLChannel);
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}
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static uint8_t RFCOMM_GetFCSValue(const void* FrameStart,
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uint8_t Length)
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{
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uint8_t FCS = 0xFF;
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/* Calculate new Frame CRC value via the given data bytes and the CRC table */
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for (uint8_t i = 0; i < Length; i++)
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FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((const uint8_t*)FrameStart)[i]]);
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return ~FCS;
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}
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static void RFCOMM_ProcessDM(const RFCOMM_Address_t* const FrameAddress,
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Bluetooth_Channel_t* const ACLChannel)
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{
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BT_RFCOMM_DEBUG(1, "<< DM Received");
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BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
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}
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static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress,
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Bluetooth_Channel_t* const ACLChannel)
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{
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BT_RFCOMM_DEBUG(1, "<< DISC Received");
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BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
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RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);
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/* If the requested channel is currently open, destroy it */
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if (RFCOMMChannel != NULL)
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RFCOMMChannel->State = RFCOMM_Channel_Closed;
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BT_RFCOMM_DEBUG(1, ">> UA Sent");
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RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, ACLChannel);
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}
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static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress,
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Bluetooth_Channel_t* const ACLChannel)
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{
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BT_RFCOMM_DEBUG(1, "<< SABM Received");
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BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
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if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
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{
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BT_RFCOMM_DEBUG(1, ">> UA Sent");
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/* Free channel found, or request was to the control channel - accept SABM by sending a UA frame */
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RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, ACLChannel);
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return;
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}
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/* Find the existing channel's entry in the channel table */
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RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);
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/* Existing entry not found, create a new entry for the channel */
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if (RFCOMMChannel == NULL)
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RFCOMMChannel = RFCOMM_GetFreeChannelEntry(FrameAddress->DLCI);
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/* If space was found in the channel table for the new channel, ACK the request */
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if (RFCOMMChannel != NULL)
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{
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BT_RFCOMM_DEBUG(1, ">> UA Sent");
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/* Free channel found, or request was to the control channel - accept SABM by sending a UA frame */
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RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, ACLChannel);
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}
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else
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{
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BT_RFCOMM_DEBUG(1, ">> DM Sent");
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/* No free channel in the multiplexer - decline the SABM by sending a DM frame */
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RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_DM | FRAME_POLL_FINAL), 0, NULL, ACLChannel);
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}
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}
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static void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress,
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Bluetooth_Channel_t* const ACLChannel)
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{
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BT_RFCOMM_DEBUG(1, "<< UA Received");
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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);
|
|
}
|
|
|