Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 #define  INCLUDE_FROM_RFCOMM_C
  32 #include "RFCOMM.h"
  33
  34 /** 8-Bit CRC table used by the FCS field of each RFCOMM encoded frame, sourced from the ETSI TS 101 369 V7.2.0
  35  *  specification document, upon which the RFCOMM specification is based.
  36  */
  37 const uint8_t CRC8_Table[256] PROGMEM =
  38         {
  39                 0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B,
  40                 0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67,
  41                 0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43,
  42                 0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F,
  43                 0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B,
  44                 0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17,
  45                 0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33,
  46                 0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F,
  47                 0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B,
  48                 0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87,
  49                 0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3,
  50                 0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF,
  51                 0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB,
  52                 0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7,
  53                 0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3,
  54                 0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
  55         };
  56
  57 /** Initializes the RFCOMM service, ready for new connections from a SDP client. */
  58 void RFCOMM_Initialize(void)
  59 {
  60         /* Not currently used */
  61 }
  62
  63 void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
  64 {
  65         RFCOMM_Header_t* FrameHeader = (RFCOMM_Header_t*)Data;
  66
  67         /* Decode the RFCOMM frame type from the header */
  68         switch (FrameHeader->FrameType & ~FRAME_POLL_FINAL)
  69         {
  70                 case RFCOMM_Frame_SABM:
  71                         RFCOMM_ProcessSABM(FrameHeader, Channel);
  72                         break;
  73                 case RFCOMM_Frame_UA:
  74                         RFCOMM_ProcessUA(FrameHeader, Channel);
  75                         break;
  76                 case RFCOMM_Frame_DM:
  77                         RFCOMM_ProcessDM(FrameHeader, Channel);
  78                         break;
  79                 case RFCOMM_Frame_DISC:
  80                         RFCOMM_ProcessDISC(FrameHeader, Channel);
  81                         break;
  82                 case RFCOMM_Frame_UIH:
  83                         RFCOMM_ProcessUIH(FrameHeader, Channel);
  84                         break;
  85         }
  86 }
  87
  88 static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
  89 {
  90         uint8_t* CurrBufferPos = ((uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
  91         uint16_t DataLen       = RFCOMM_GetFrameDataLength(&CurrBufferPos);
  92
  93         BT_RFCOMM_DEBUG(1, "<< SABM Received");
  94         BT_RFCOMM_DEBUG(2, "-- Data Length 0x%04X", DataLen);
  95
  96         for (uint16_t i = 0; i < DataLen; i++)
  97           printf("0x%02X ", CurrBufferPos[i]);
  98         printf("\r\n");
  99 }
 100
 101 static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
 102 {
 103         BT_RFCOMM_DEBUG(1, "<< UA Received");
 104 }
 105
 106 static void RFCOMM_ProcessDM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
 107 {
 108         BT_RFCOMM_DEBUG(1, "<< DM Received");
 109 }
 110
 111 static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
 112 {
 113         BT_RFCOMM_DEBUG(1, "<< DISC Received");
 114 }
 115
 116 static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
 117 {
 118         BT_RFCOMM_DEBUG(1, "<< UIH Received");
 119 }
 120
 121 static uint16_t RFCOMM_GetFrameDataLength(void** BufferPos)
 122 {
 123         uint8_t FirstOctet = *((uint8_t*)*BufferPos);
 124         (*BufferPos)++;
 125
 126         uint8_t SecondOctet = 0;
 127
 128         if (!(FirstOctet & 0x01))
 129         {
 130                 SecondOctet = *((uint8_t*)*BufferPos);
 131                 (*BufferPos)++;
 132         }
 133
 134         return (((uint16_t)SecondOctet << 7) | (FirstOctet >> 1));
 135 }
 136