twi.h

00001 /*
00002   twi.h - TWI/I2C library for Wiring & Arduino
00003   Copyright (c) 2006 Nicholas Zambetti.  All right reserved.
00004   This library is free software; you can redistribute it and/or
00005   modify it under the terms of the GNU Lesser General Public
00006   License as published by the Free Software Foundation; either
00007   version 2.1 of the License, or (at your option) any later version.
00008   This library is distributed in the hope that it will be useful,
00009   but WITHOUT ANY WARRANTY; without even the implied warranty of
00010   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00011   Lesser General Public License for more details.
00012   You should have received a copy of the GNU Lesser General Public
00013   License along with this library; if not, write to the Free Software
00014   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00015 */
00016 
00017 #ifndef twi_h
00018 #define twi_h
00019 
00020   #include <inttypes.h>
00021 
00022   //#define ATMEGA8
00023 
00024   #ifndef TWI_FREQ
00025   #define TWI_FREQ 100000L
00026   #endif
00027 
00028   #ifndef TWI_BUFFER_LENGTH
00029   #define TWI_BUFFER_LENGTH 32
00030   #endif
00031 
00032   #define TWI_READY 0
00033   #define TWI_MRX   1
00034   #define TWI_MTX   2
00035   #define TWI_SRX   3
00036   #define TWI_STX   4
00037   
00038   void twi_init(void);
00039   void twi_setAddress(uint8_t);
00040   uint8_t twi_readFrom(uint8_t, uint8_t*, uint8_t, uint8_t);
00041   uint8_t twi_writeTo(uint8_t, uint8_t*, uint8_t, uint8_t, uint8_t);
00042   uint8_t twi_transmit(const uint8_t*, uint8_t);
00043   void twi_attachSlaveRxEvent( void (*)(uint8_t*, int) );
00044   void twi_attachSlaveTxEvent( void (*)(void) );
00045   void twi_reply(uint8_t);
00046   void twi_stop(void);
00047   void twi_releaseBus(void);
00048 
00049 #endif