Start implementation of RFCOMM decoding layer. Add new service initialize routines for each Bluetooth service - currently unused, but will eventually reset the service state of RFCOMM when a new connection is made.

Demos/Host/Incomplete/BluetoothHost/BluetoothHost.c

@@ -213,6 +213,10 @@ void Bluetooth_StackInitialized(void)
 	printf_P(PSTR("Stack initialized with local address %02X:%02X:%02X:%02X:%02X:%02X.\r\n"),
 	         Bluetooth_State.LocalBDADDR[5], Bluetooth_State.LocalBDADDR[4], Bluetooth_State.LocalBDADDR[3],
 	         Bluetooth_State.LocalBDADDR[2], Bluetooth_State.LocalBDADDR[1], Bluetooth_State.LocalBDADDR[0]);
+			 
+	/* Reinitialize the services placed on top of the bluetooth stack ready for new connections */
+	SDP_Initialize();
+	RFCOMM_Initialize();
 }
 
 /** Bluetooth stack callback event for a Bluetooth connection request. When this callback fires, the

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

@@ -28,9 +28,76 @@
   this software.
 */
 
+#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
+	};
+
+/** Initializes the RFCOMM service, ready for new connections from a SDP client. */
+void RFCOMM_Initialize(void)
+{
+	/* Not currently used */
+}
+
 void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
 {
-	BT_RFCOMM_DEBUG(1, "PACKET RECEIVED");
+	RFCOMM_Header_t* FrameHeader = (RFCOMM_Header_t*)Data;
+	
+	/* Decode the RFCOMM frame type from the header */
+	switch (FrameHeader->FrameType & ~FRAME_POLL_FINAL)
+	{
+		case RFCOMM_Frame_SABM:
+			BT_RFCOMM_DEBUG(1, "<< SABM Received");
+			break;
+		case RFCOMM_Frame_UA:
+			BT_RFCOMM_DEBUG(1, "<< UA Received");
+			break;
+		case RFCOMM_Frame_DM:
+			BT_RFCOMM_DEBUG(1, "<< DM Received");
+			break;
+		case RFCOMM_Frame_DISC:
+			BT_RFCOMM_DEBUG(1, "<< DISC Received");
+			break;
+		case RFCOMM_Frame_UIH:
+			BT_RFCOMM_DEBUG(1, "<< UIH Received");
+			break;
+	}
+}
+
+static uint16_t RFCOMM_GetFrameDataLength(void** BufferPos)
+{
+	uint8_t FirstOctet = *((uint8_t*)*BufferPos);
+	(*BufferPos)++;
+
+	uint8_t SecondOctet = 0;
+	
+	if (!(FirstOctet & 0x01))
+	{
+		SecondOctet = *((uint8_t*)*BufferPos);
+		(*BufferPos)++;
+	}
+	
+	return (((uint16_t)SecondOctet << 7) | (FirstOctet >> 1));
 }
+

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

@@ -38,6 +38,7 @@
 
 	/* Includes: */
 		#include <avr/io.h>
+		#include <avr/pgmspace.h>
 		#include <string.h>
 		#include <stdbool.h>
 		#include <stdio.h>
@@ -51,7 +52,37 @@
 		#define BT_RFCOMM_DEBUG(l, s, ...)              do { if (RFCOMM_DEBUG_LEVEL >= l) printf_P(PSTR("(RFCOMM) " s "\r\n"), ##__VA_ARGS__); } while (0)
 		#define RFCOMM_DEBUG_LEVEL                      2
 		
+		#define FRAME_POLL_FINAL                        (1 << 5)
+	
+	/* Enums: */
+		enum RFCOMM_Frame_Types_t
+		{
+			RFCOMM_Frame_SABM  = 0x2F, /**< Set Asynchronous Balance Mode Field */
+			RFCOMM_Frame_UA    = 0x63, /**< Unnumbered Acknowledgement Field */
+			RFCOMM_Frame_DM    = 0x0F, /**< Disconnected Mode Field */
+			RFCOMM_Frame_DISC  = 0x43, /**< Disconnect Field */
+			RFCOMM_Frame_UIH   = 0xEF, /**< Unnumbered Information with Header check Field */
+		};
+	
+	/* Type Defines: */
+		typedef struct
+		{
+			struct
+			{
+				unsigned char LogicalChannel   : 6;
+				unsigned char CommandResponse  : 1;
+				unsigned char LastAddressOctet : 1;
+			} Header;
+			
+			uint8_t FrameType;
+		} RFCOMM_Header_t;
+
 	/* Function Prototypes: */
+		void RFCOMM_Initialize(void);
 		void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel);
 		
+		#if defined(INCLUDE_FROM_RFCOMM_C)
+			static uint16_t RFCOMM_GetFrameDataLength(void** BufferPos);
+		#endif
+		
 #endif

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

@@ -40,6 +40,12 @@ const ServiceAttributeTable_t* SDP_Services_Table[] PROGMEM =
 /** Base UUID value common to all standardized Bluetooth services */
 const UUID_t BaseUUID PROGMEM = {0x00000000, BASE_80BIT_UUID};
 
+/** Initializes the SDP service, ready for new connections from a SDP client. */
+void SDP_Initialize(void)
+{
+	/* Not currently used */
+}
+
 /** Main Service Discovery Protocol packet processing routine. This function processes incomming SDP packets from
  *  a connected Bluetooth device, and sends back appropriate responses to allow other devices to determine the
  *  services the local device exposes.

Demos/Host/Incomplete/BluetoothHost/Lib/ServiceDiscoveryProtocol.h

@@ -38,6 +38,7 @@
 
 	/* Includes: */
 		#include <avr/io.h>
+		#include <avr/pgmspace.h>
 		#include <string.h>
 		#include <stdbool.h>
 		#include <stdio.h>
@@ -210,6 +211,7 @@
 		}
 		
 	/* Function Prototypes: */
+		void SDP_Initialize(void);
 		void SDP_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel);
 
 		#if defined(INCLUDE_FROM_SERVICEDISCOVERYPROTOCOL_C)