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