1/*
2  twi.h - TWI/I2C library for Wiring & Arduino
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
20#ifndef twi_h
21#define twi_h
22
23  #include <inttypes.h>
24
25  //#define ATMEGA8
26
27  #ifndef CPU_FREQ
28  #define CPU_FREQ 16000000L
29  #endif
30
31  #ifndef TWI_FREQ
32  #define TWI_FREQ 100000L
33  #endif
34
35  #ifndef TWI_BUFFER_LENGTH
36  #define TWI_BUFFER_LENGTH 32
37  #endif
38
39  #define TWI_READY 0
40  #define TWI_MRX   1
41  #define TWI_MTX   2
42  #define TWI_SRX   3
43  #define TWI_STX   4
44
45  void twi_init(void);
46  void twi_setAddress(uint8_t);
47  uint8_t twi_readFrom(uint8_t, uint8_t*, uint8_t);
48  uint8_t twi_writeTo(uint8_t, uint8_t*, uint8_t, uint8_t);
49  uint8_t twi_transmit(uint8_t*, uint8_t);
50  void twi_attachSlaveRxEvent( void (*)(uint8_t*, int) );
51  void twi_attachSlaveTxEvent( void (*)(void) );
52  void twi_reply(uint8_t);
53  void twi_stop(void);
54  void twi_releaseBus(void);
55
56#endif
57
58