SPP.h

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/* Copyright (C) 2012 Kristian Lauszus, TKJ Electronics. All rights reserved.
 
 This software may be distributed and modified under the terms of the GNU
 General Public License version 2 (GPL2) as published by the Free Software
 Foundation and appearing in the file GPL2.TXT included in the packaging of
 this file. Please note that GPL2 Section 2[b] requires that all works based
 on this software must also be made publicly available under the terms of
 the GPL2 ("Copyleft").
 
 Contact information
 -------------------
 
 Kristian Lauszus, TKJ Electronics
 Web      :  http://www.tkjelectronics.com
 e-mail   :  kristianl@tkjelectronics.com
 */
 
#ifndef _spp_h_
#define _spp_h_
 
#include "BTD.h"
 
/* Used for RFCOMM */
#define RFCOMM_SABM     0x2F
#define RFCOMM_UA       0x63
#define RFCOMM_UIH      0xEF
//#define RFCOMM_DM       0x0F
#define RFCOMM_DISC     0x43
 
#define extendAddress   0x01 // Always 1
 
// Multiplexer message types
#define BT_RFCOMM_PN_CMD     0x83
#define BT_RFCOMM_PN_RSP     0x81
#define BT_RFCOMM_MSC_CMD    0xE3
#define BT_RFCOMM_MSC_RSP    0xE1
#define BT_RFCOMM_RPN_CMD    0x93
#define BT_RFCOMM_RPN_RSP    0x91
/*
#define BT_RFCOMM_TEST_CMD   0x23
#define BT_RFCOMM_TEST_RSP   0x21
#define BT_RFCOMM_FCON_CMD   0xA3
#define BT_RFCOMM_FCON_RSP   0xA1
#define BT_RFCOMM_FCOFF_CMD  0x63
#define BT_RFCOMM_FCOFF_RSP  0x61
#define BT_RFCOMM_RLS_CMD    0x53
#define BT_RFCOMM_RLS_RSP    0x51
#define BT_RFCOMM_NSC_RSP    0x11
 */
 
class SPP : public BluetoothService, public Stream {
public:
        SPP(BTD *p, const char *name = "Arduino", const char *pin = "0000");
 
        void disconnect();
        operator bool() {
                return connected;
        }
        bool connected;
 
        int available(void);
 
        void flush(void) {
                send();
        };
        int peek(void);
        int read(void);
 
#if defined(ARDUINO) && ARDUINO >=100
        size_t write(uint8_t data);
        size_t write(const uint8_t* data, size_t size);
#if !defined(RBL_NRF51822) && !defined(NRF52_SERIES)
        using Print::write;
#endif
#else
        void write(uint8_t data);
        void write(const uint8_t* data, size_t size);
#endif
 
        void discard(void);
        void send(void);
protected:
        void ACLData(uint8_t* ACLData);
        void Run();
        void Reset();
        void onInit();
private:
        /* Set true when a channel is created */
        bool SDPConnected;
        bool RFCOMMConnected;
 
        /* Variables used by L2CAP state machines */
        uint8_t l2cap_sdp_state;
        uint8_t l2cap_rfcomm_state;
 
        uint8_t l2capoutbuf[BULK_MAXPKTSIZE]; // General purpose buffer for l2cap out data
        uint8_t rfcommbuf[10]; // Buffer for RFCOMM Commands
 
        /* L2CAP Channels */
        uint8_t sdp_scid[2]; // L2CAP source CID for SDP
        uint8_t sdp_dcid[2]; // 0x0050
        uint8_t rfcomm_scid[2]; // L2CAP source CID for RFCOMM
        uint8_t rfcomm_dcid[2]; // 0x0051
 
        /* RFCOMM Variables */
        uint8_t rfcommChannel;
        uint8_t rfcommChannelConnection; // This is the channel the SPP channel will be running at
        uint8_t rfcommDirection;
        uint8_t rfcommCommandResponse;
        uint8_t rfcommChannelType;
        uint8_t rfcommPfBit;
 
        uint32_t timer;
        bool waitForLastCommand;
        bool creditSent;
 
        uint8_t rfcommDataBuffer[100]; // Create a 100 sized buffer for incoming data
        uint8_t sppOutputBuffer[100]; // Create a 100 sized buffer for outgoing SPP data
        uint8_t sppIndex;
        uint8_t rfcommAvailable;
 
        bool firstMessage; // Used to see if it's the first SDP request received
        uint8_t bytesRead; // Counter to see when it's time to send more credit
 
        /* State machines */
        void SDP_task(); // SDP state machine
        void RFCOMM_task(); // RFCOMM state machine
 
        /* SDP Commands */
        void SDP_Command(uint8_t *data, uint8_t nbytes);
        void serviceNotSupported(uint8_t transactionIDHigh, uint8_t transactionIDLow);
        void serialPortResponse1(uint8_t transactionIDHigh, uint8_t transactionIDLow);
        void serialPortResponse2(uint8_t transactionIDHigh, uint8_t transactionIDLow);
        void l2capResponse1(uint8_t transactionIDHigh, uint8_t transactionIDLow);
        void l2capResponse2(uint8_t transactionIDHigh, uint8_t transactionIDLow);
 
        /* RFCOMM Commands */
        void RFCOMM_Command(uint8_t *data, uint8_t nbytes);
        void sendRfcomm(uint8_t channel, uint8_t direction, uint8_t CR, uint8_t channelType, uint8_t pfBit, uint8_t *data, uint8_t length);
        void sendRfcommCredit(uint8_t channel, uint8_t direction, uint8_t CR, uint8_t channelType, uint8_t pfBit, uint8_t credit);
        uint8_t calcFcs(uint8_t *data);
        bool checkFcs(uint8_t *data, uint8_t fcs);
        uint8_t crc(uint8_t *data);
};
#endif