avr_spi.h

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/*
 *  avr_spi.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_SPI_H__
#define __AVR_SPI_H__

#ifdef __cplusplus
extern "C"
{
#endif

#include "sim_avr.h"

  enum
    {
      SPI_IRQ_INPUT = 0,
      SPI_IRQ_OUTPUT,
      SPI_IRQ_COUNT
    };

#define AVR_IOCTL_SPI_GETIRQ(_name) AVR_IOCTL_DEF('s','p','i',(_name))

  typedef struct avr_spi_t
  {
    avr_io_t io;
    char name;
    avr_regbit_t disabled;   

    avr_io_addr_t r_spdr;   
    avr_io_addr_t r_spcr;   
    avr_io_addr_t r_spsr;   

    avr_regbit_t spe;   
    avr_regbit_t mstr;   
    avr_regbit_t spr[4];   

    avr_int_vector_t spi;   

    uint8_t input_data_register;
  } avr_spi_t;

  void avr_spi_init (avr_t * avr, avr_spi_t * port);

#define AVR_SPI_DECLARE(_prr, _prspi)                                   \
  .spi = {                                                              \
    .disabled = AVR_IO_REGBIT(_prr, _prspi),                            \
                                                                        \
    .r_spdr = SPDR,                                                     \
    .r_spcr = SPCR,                                                     \
    .r_spsr = SPSR,                                                     \
                                                                        \
    .spe = AVR_IO_REGBIT(SPCR, SPE),                                    \
    .mstr = AVR_IO_REGBIT(SPCR, MSTR),                                  \
                                                                        \
    .spr = { AVR_IO_REGBIT(SPCR, SPR0), AVR_IO_REGBIT(SPCR, SPR1), AVR_IO_REGBIT(SPSR, SPI2X) }, \
    .spi = {                                                            \
      .enable = AVR_IO_REGBIT(SPCR, SPIE),                              \
      .raised = AVR_IO_REGBIT(SPSR, SPIF),                              \
      .vector = SPI_STC_vect,                                           \
    },                                                                  \
  }

#ifdef __cplusplus
};
#endif

#endif /*__AVR_SPI_H__*/