avr_twi.h

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/*
 *  avr_twi.h
 * 
 *  Copyright 2008, 2009 Michel Pollet <buserror@gmail.com>
 * 
 *  This file is part of simavr.
 * 
 *  simavr 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 3 of the
 *  License, or (at your option) any later version.
 * 
 *  simavr 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 simavr.  If not, see
 *  <http://www.gnu.org/licenses/>.
 */

#ifndef __AVR_TWI_H__
#define __AVR_TWI_H__

#ifdef __cplusplus
extern "C"
{
#endif

#include "sim_avr.h"

  // #include "sim_twi.h"

  enum
    {
      TWI_IRQ_INPUT = 0,
      TWI_IRQ_OUTPUT,
      TWI_IRQ_STATUS,
      TWI_IRQ_COUNT
    };

  enum
    {
      TWI_COND_START = (1 << 0),
      TWI_COND_STOP = (1 << 1),
      TWI_COND_ADDR = (1 << 2),
      TWI_COND_ACK = (1 << 3),
      TWI_COND_WRITE = (1 << 4),
      TWI_COND_READ = (1 << 5),
      TWI_COND_SLAVE = (1 << 6),
    };

  typedef struct avr_twi_msg_t
  {
    uint32_t unused:8, msg:8, addr:8, data:8;
  } avr_twi_msg_t;

  typedef struct avr_twi_msg_irq_t
  {
    union
    {
      uint32_t v;
      avr_twi_msg_t twi;
    } u;
  } avr_twi_msg_irq_t;

#define AVR_IOCTL_TWI_GETIRQ(_name) AVR_IOCTL_DEF('t','w','i',(_name))

  typedef struct avr_twi_t
  {
    avr_io_t io;
    char name;

    avr_regbit_t disabled;   

    avr_io_addr_t r_twbr;   
    avr_io_addr_t r_twcr;   
    avr_io_addr_t r_twsr;   
    avr_io_addr_t r_twar;   
    avr_io_addr_t r_twamr;   
    avr_io_addr_t r_twdr;   

    avr_regbit_t twen;   
    avr_regbit_t twea;   
    avr_regbit_t twsta;   
    avr_regbit_t twsto;   
    avr_regbit_t twwc;   

    avr_regbit_t twsr;   
    avr_regbit_t twps;   

    avr_int_vector_t twi;   

    uint8_t state;
    uint8_t peer_addr;
    uint8_t next_twstate;
  } avr_twi_t;

  void avr_twi_init (avr_t * avr, avr_twi_t * port);

  uint32_t avr_twi_irq_msg (uint8_t msg, uint8_t addr, uint8_t data);

#ifdef __cplusplus
};
#endif

#endif /*__AVR_TWI_H__*/