-/*\r
- LUFA Library\r
- Copyright (C) Dean Camera, 2010.\r
- \r
- dean [at] fourwalledcubicle [dot] com\r
- www.fourwalledcubicle.com\r
-*/\r
-\r
-/*\r
- Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
- Permission to use, copy, modify, distribute, and sell this \r
- software and its documentation for any purpose is hereby granted\r
- without fee, provided that the above copyright notice appear in \r
- all copies and that both that the copyright notice and this\r
- permission notice and warranty disclaimer appear in supporting \r
- documentation, and that the name of the author not be used in \r
- advertising or publicity pertaining to distribution of the \r
- software without specific, written prior permission.\r
-\r
- The author disclaim all warranties with regard to this\r
- software, including all implied warranties of merchantability\r
- and fitness. In no event shall the author be liable for any\r
- special, indirect or consequential damages or any damages\r
- whatsoever resulting from loss of use, data or profits, whether\r
- in an action of contract, negligence or other tortious action,\r
- arising out of or in connection with the use or performance of\r
- this software.\r
-*/\r
-\r
-#include "RFCOMM.h"\r
-\r
-void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)\r
-{\r
- BT_RFCOMM_DEBUG(1, "PACKET RECEIVED");\r
-}\r
+/*
+ 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");
+}
projects / pub / USBasp.git / blobdiff