/* Copyright (c) 2008 Axel Wachtler
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   * Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   * 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.
   * Neither the name of the authors nor the names of its contributors
     may be used to endorse or promote products derived from this software
     without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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: base_rdk2xx.h,v 1.4 2010/03/16 06:24:29 awachtler Exp $ */
#ifndef BASE_RDK2XX_H
#define BASE_RDK2XX_H


#ifndef PB0
# define PB0 (0)
# define PB1 (1)
# define PB2 (2)
# define PB3 (3)
# define PB4 (4)
# define PB5 (5)
# define PB6 (6)
# define PB7 (7)
# define PD4 (4)
#endif

#ifndef DEFAULT_SPI_RATE
# define DEFAULT_SPI_RATE  (SPI_RATE_1_2)
#endif

/*=== Hardware Components ============================================*/
#ifndef RADIO_TYPE
# define RADIO_TYPE (RADIO_AT86RF230)    /**< used radiio (see const.h)*/
#endif

/*=== TRX pin access macros ==========================================*/

#define DDR_TRX_RESET   DDRB          /**< DDR register for RESET pin */
#define PORT_TRX_RESET  PORTB         /**< PORT register for RESET pin */
#define MASK_TRX_RESET  (_BV(5))      /**< PIN mask for RESET pin */

#define TRX_RESET_INIT() DDR_TRX_RESET |= MASK_TRX_RESET    /**< RESET pin IO initialization */
#define TRX_RESET_HIGH() PORT_TRX_RESET |= MASK_TRX_RESET   /**< set RESET pin to high level */
#define TRX_RESET_LOW()  PORT_TRX_RESET &= ~MASK_TRX_RESET  /**< set RESET pin to low level */

#define PORT_TRX_SLPTR  PORTB         /**< DDR register for SLEEP_TR pin */
#define DDR_TRX_SLPTR   DDRB          /**< PORT register for SLEEP_TR pin */
#define MASK_TRX_SLPTR  (_BV(PB4))    /**< PIN mask for SLEEP_TR pin */

/** SLEEP_TR pin IO initialization */
#define TRX_SLPTR_INIT() DDR_TRX_SLPTR |= MASK_TRX_SLPTR
/** set SLEEP_TR pin to high level */
#define TRX_SLPTR_HIGH() PORT_TRX_SLPTR |= MASK_TRX_SLPTR
/**< set SLEEP_TR pin to low level */
#define TRX_SLPTR_LOW()  PORT_TRX_SLPTR &= ~MASK_TRX_SLPTR


/*=== IRQ access macros ==============================================*/
# define TRX_IRQ_vect    INT0_vect    /**< interrupt vector name */
# define TRX_IRQ         _BV(INT0)    /**< interrupt mask for GICR */

/** init interrupt handling
 *  - rising edge triggers ICP1 (ICES1),
 *  - timer capture is enabled (ICF1)
 */
# define TRX_IRQ_INIT()  do{\
                            EICRA = _BV(ISC00) | _BV(ISC01);\
                            EIMSK  |= _BV(INT0);\
                          } while(0)

/** disable TRX interrupt */
#define DI_TRX_IRQ() {EIMSK &= (~(TRX_IRQ));}

/** enable TRX interrupt */
#define EI_TRX_IRQ() {EIMSK |= (TRX_IRQ);}

/** timestamp register for RX_START event
 * FIXME: add and test the enabling of input capture for separate RX_START (AT86RF231/212)
 *        currently we use the timer register.
 */
#define TRX_TSTAMP_REG TCNT1

/*=== SPI access macros ==============================================*/
#define DDR_SPI  (DDRB)   /**< DDR register for SPI port */
#define PORT_SPI (PORTB)  /**< PORT register for SPI port */

#define SPI_MOSI _BV(PB2)  /**< PIN mask for MOSI pin */
#define SPI_MISO _BV(PB3)  /**< PIN mask for MISO pin */
#define SPI_SCK  _BV(PB1)  /**< PIN mask for SCK pin */
#define SPI_SS   _BV(PB0)  /**< PIN mask for SS pin */

#define SPI_DATA_REG SPDR  /**< abstraction for SPI data register */


/**
 * @brief inline function for SPI initialization
 */
static inline void SPI_INIT(uint8_t spirate)
{
    /* first configure SPI Port, then SPCR */
    PORT_SPI |= SPI_SCK | SPI_SS;
    DDR_SPI  |= SPI_MOSI | SPI_SCK | SPI_SS;
    DDR_SPI  &= ~SPI_MISO;

    SPCR = (_BV(SPE) | _BV(MSTR));

    SPCR &= ~(_BV(SPR1) | _BV(SPR0) );
    SPSR &= ~_BV(SPI2X);

    SPCR |= (spirate & 0x03);
    SPSR |= ((spirate >> 2) & 0x01);

}

/** set SS line to low level */
#define SPI_SELN_LOW()       uint8_t sreg = SREG; cli(); PORT_SPI &=~SPI_SS
/** set SS line to high level */
#define SPI_SELN_HIGH()      PORT_SPI |= SPI_SS; SREG = sreg
/** wait until SPI transfer is ready */
#define SPI_WAITFOR()        do { while((SPSR & _BV(SPIF)) == 0);} while(0)


#endif
/* EOF */
