1  /*
 2    TwoWire.h - TWI/I2C library for Arduino & Wiring
 3    Copyright (c) 2006 Nicholas Zambetti.  All right reserved.
 4  
 5    This library is free software; you can redistribute it and/or
 6    modify it under the terms of the GNU Lesser General Public
 7    License as published by the Free Software Foundation; either
 8    version 2.1 of the License, or (at your option) any later version.
 9  
10    This library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14  
15    You should have received a copy of the GNU Lesser General Public
16    License along with this library; if not, write to the Free Software
17    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
18  
19    Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
20  */
21  
22  #ifdef __AVR_ATtiny85__
23  
24  #include "TinyWireM.h"
25  
26  #else
27  
28  #ifndef TwoWire_h
29  #define TwoWire_h
30  
31  #include <inttypes.h>
32  #include "Stream.h"
33  
34  #define BUFFER_LENGTH 32
35  
36  // WIRE_HAS_END means Wire has end()
37  #define WIRE_HAS_END 1
38  
39  class TwoWire : public Stream
40  {
41    private:
42      static uint8_t rxBuffer[];
43      static uint8_t rxBufferIndex;
44      static uint8_t rxBufferLength;
45  
46      static uint8_t txAddress;
47      static uint8_t txBuffer[];
48      static uint8_t txBufferIndex;
49      static uint8_t txBufferLength;
50  
51      static uint8_t transmitting;
52      static void (*user_onRequest)(void);
53      static void (*user_onReceive)(int);
54      static void onRequestService(void);
55      static void onReceiveService(uint8_t*, int);
56    public:
57      TwoWire();
58      void begin();
59      void begin(uint8_t);
60      void begin(int);
61      void end();
62      void setClock(uint32_t);
63      void beginTransmission(uint8_t);
64      void beginTransmission(int);
65      uint8_t endTransmission(void);
66      uint8_t endTransmission(uint8_t);
67      uint8_t requestFrom(uint8_t, uint8_t);
68      uint8_t requestFrom(uint8_t, uint8_t, uint8_t);
69      uint8_t requestFrom(int, int);
70      uint8_t requestFrom(int, int, int);
71      virtual size_t write(uint8_t);
72      virtual size_t write(const uint8_t *, size_t);
73      virtual int available(void);
74      virtual int read(void);
75      virtual int peek(void);
76      virtual void flush(void);
77      void onReceive( void (*)(int) );
78      void onRequest( void (*)(void) );
79  
80      inline size_t write(unsigned long n) { return write((uint8_t)n); }
81      inline size_t write(long n) { return write((uint8_t)n); }
82      inline size_t write(unsigned int n) { return write((uint8_t)n); }
83      inline size_t write(int n) { return write((uint8_t)n); }
84      using Print::write;
85  };
86  
87  extern TwoWire Wire;
88  
89  #endif
90  
91  #endif //attiny85