sja1000_private.h

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// ----------------------------------------------------------------------------
/*
 * Copyright (c) 2007 Fabian Greif, Roboterclub Aachen e.V.
 *  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id$
 */
// ----------------------------------------------------------------------------

#ifndef SJA1000_PRIVATE_H
#define SJA1000_PRIVATE_H

// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------

#include <avr/io.h>
#include <avr/pgmspace.h>

#include "can_private.h"

#include "can.h"
#include "utils.h"

#if (BUILD_FOR_SJA1000 == 1)
        // set some default-values
        #ifndef SJA1000_MEMORY_MAPPED
                #define SJA1000_MEMORY_MAPPED   0
        #endif
        
        // check if the settings are correct
        #if SUPPORT_EXTENDED_CANID == 0
                #error  Extended CANIDs need to be supported!
        #endif
        
        #ifndef SJA1000_INT
                #error  SJA1000_INT     is not defined!
        #endif
        
        #ifndef SJA1000_CLKOUT_PRESCALER
                #define SJA1000_CLOCK_REGISTER          (1<<CLKOFF)
        #else
                #if SJA1000_CLKOUT_PRESCALER == 1
                        #define SJA1000_CLOCK_REGISTER          ((1<<CD2)|(1<<CD1)|(1<<CD0))
                #elif SJA1000_CLKOUT_PRESCALER == 2
                        #define SJA1000_CLOCK_REGISTER          0
                #elif SJA1000_CLKOUT_PRESCALER == 4
                        #define SJA1000_CLOCK_REGISTER          (1<<CD0)
                #elif SJA1000_CLKOUT_PRESCALER == 6
                        #define SJA1000_CLOCK_REGISTER          (1<<CD1)
                #elif SJA1000_CLKOUT_PRESCALER == 8
                        #define SJA1000_CLOCK_REGISTER          ((1<<CD1)|(1<<CD0))
                #elif SJA1000_CLKOUT_PRESCALER == 10
                        #define SJA1000_CLOCK_REGISTER          (1<<CD2)
                #elif SJA1000_CLKOUT_PRESCALER == 12
                        #define SJA1000_CLOCK_REGISTER          ((1<<CD2)|(1<<CD0))
                #elif SJA1000_CLKOUT_PRESCALER == 14
                        #define SJA1000_CLOCK_REGISTER          ((1<<CD2)|(1<<CD1))
                #endif
        #endif
        
        #if SJA1000_MEMORY_MAPPED
                #ifndef SJA1000_BASE_ADDR
                        #error  SJA1000_BASE_ADDR is not defined!
                #endif
                
                #define SUPPORT_FOR_SJA1000__           1
                
                // write to a register
                static inline void sja1000_write(uint8_t address, uint8_t data) {
                        (*((uint8_t *) (SJA1000_BASE_ADDR + address))) = data;
                }

                // read a register
                static inline uint8_t sja1000_read(uint8_t address) {
                        return (*((uint8_t *) (SJA1000_BASE_ADDR + address)));
                }

        #else
                #warning    not tested yet!

                #if !defined(SJA1000_WR) || !defined(SJA1000_RD) || \
                        !defined(SJA1000_CS) || !defined(SJA1000_DATA) || !defined(SJA1000_ALE)
                        #error in definition of SJA1000-pins (check SJA1000_WR, SJA1000_RD, SJA1000_CS, SJA1000_DATA and SJA1000_ALE)!
                #endif
                
                #define SUPPORT_FOR_SJA1000__           1
                extern void sja1000_write(uint8_t address, uint8_t data);
                extern uint8_t sja1000_read(uint8_t address);
        #endif  // SJA1000_MEMORY_MAPPED

        #ifdef  SUPPORT_FOR_SJA1000__
                #include "sja1000_defs.h"
        #endif
#endif  // SUPPORT_SJA1000

#endif  // SJA1000_PRIVATE_H