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/****************************************************************************
* Copyright (C) 2009-2012 by Claas Anders "CaScAdE" Rathje *
* admiralcascade@gmail.com *
* Project-URL: http://www.mylifesucks.de/oss/c-strom/ *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
****************************************************************************/
/****************************************************************************
* *
* Most of the i²c/twi code is originally from *
* http://www.rn-wissen.de/index.php/TWI_Slave_mit_avr-gcc *
* *
****************************************************************************/
#define I2C_BUFFER_SIZE 10
// ACK
#define TWCR_ACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC);
// NACK
#define TWCR_NACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(0<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC);
// non addressed slave mode
#define TWCR_RESET TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC);
#define CSTROM_I2C 0b00100000 // = 0x20 = 32
volatile uint8_t i2c_rx_buffer[I2C_BUFFER_SIZE];
// here we use the same for SPI and TWI
extern union SPI_buffer_t SPI_buffer;
#define i2c_tx_buffer SPI_buffer.buffer.c
// otherwise take this
//volatile uint8_t i2c_tx_buffer[I2C_BUFFER_SIZE];
volatile uint8_t i2c_buf_adr;
void init_twi_slave (uint8_t);