X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/008e0e2e0a13e64e03f27f1c9a008ef201560878..55d7e1e65bccd6b4c44802cf971f39eb05e6e57a:/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 052bf3fdb..7c39cb028 100644 --- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c +++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c @@ -1,36 +1,281 @@ -/* - LUFA Library - Copyright (C) Dean Camera, 2010. - - dean [at] fourwalledcubicle [dot] com - www.fourwalledcubicle.com -*/ - -/* - Copyright 2010 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. -*/ - -#include "RFCOMM.h" - -void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel) -{ - BT_RFCOMM_DEBUG(1, "PACKET RECEIVED"); -} +/* + LUFA Library + Copyright (C) Dean Camera, 2010. + + dean [at] fourwalledcubicle [dot] com + www.fourwalledcubicle.com +*/ + +/* + Copyright 2010 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 confiured 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) +{ + 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); + break; + case RFCOMM_Frame_DISC: + RFCOMM_ProcessDISC(&FrameHeader->Address, Channel); + break; + case RFCOMM_Frame_SABM: + RFCOMM_ProcessSABM(&FrameHeader->Address, Channel); + break; + case RFCOMM_Frame_UA: + RFCOMM_ProcessUA(&FrameHeader->Address, Channel); + break; + case RFCOMM_Frame_UIH: + RFCOMM_ProcessUIH(&FrameHeader->Address, FrameDataLen, FrameData, Channel); + break; + default: + BT_RFCOMM_DEBUG(1, "<< Unknown Frame Received"); + break; + } +} + +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)) + 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)++; + } + + /* Bitshift 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) +{ + 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) + { + .EA = true, + .CR = CommandResponse, + .DLCI = DLCI, + }; + + /* 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); +} + +static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length) +{ + uint8_t FCS = 0xFF; + + for (uint8_t i = 0; i < Length; i++) + FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((uint8_t*)FrameStart)[i]]); + + return ~FCS; +} + +static void RFCOMM_ProcessDM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel) +{ + 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) +{ + 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; + + BT_RFCOMM_DEBUG(1, ">> UA Sent"); + RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel); +} + +static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel) +{ + 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++) + { + 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->Remote.Signals = 0 | (1 << 0); + CurrRFCOMMChannel->Remote.BreakSignal = 0 | (1 << 0); + CurrRFCOMMChannel->Local.Signals = RFCOMM_SIGNAL_RTC | RFCOMM_SIGNAL_RTR | RFCOMM_SIGNAL_DV | (1 << 0); + CurrRFCOMMChannel->Local.BreakSignal = 0 | (1 << 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, ">> 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); +} + +static void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel) +{ + 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) +{ + if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI) + { + RFCOMM_ProcessControlCommand(FrameData, Channel); + 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"); +}