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/* ----------------------------------------------------------------------------

 *         ATMEL Microcontroller Software Support

 * ----------------------------------------------------------------------------

 * Copyright (c) 2008, Atmel Corporation

 *

 * 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 disclaimer below.

 *

 * Atmel's name may not be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE

 * DISCLAIMED. IN NO EVENT SHALL ATMEL 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

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 * ----------------------------------------------------------------------------

 */

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

/// \dir

/// !Purpose

///

///     Definition of methods and structures for using PIOs in a transparent

///     way. The main purpose is to allow portability between several boards.

///

/// !Usage

///

///     -# To configure and use pins, see pio.h.

///     -# To enable and use interrupt generation on PIO status change, see

///      pio_it.h.

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

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

/// \unit

/// !Purpose

/// 

/// Simple & portable usage of PIO pins.

/// 

/// !Usage

/// 

/// -# Define a constant pin description array such as the following one:

///    \code

///       const Pin at91board_dbgu[] = {

///            {AT91C_BASE_PIOA, (1 << 30), PIO_PERIPH_A, PIO_DEFAULT},

///            {AT91C_BASE_PIOA, (1 << 31), PIO_PERIPH_A, PIO_DEFAULT},

///        };

///    \endcode

///    Alternatively, constants defined in the piodefs.h header file of the

///    board module can be used:

///    \code

///    const Pin at91board_dbgu[] = {PINS_DBGU};

///    const Pin at91board_usart[] = {PIN_USART0_RXD, PIN_USART0_TXD};

///    \endcode

///    It is possible to group multiple pins if they share the same

///    attributes, to save memory. Here is the previous DBGU example

///    rewritten in such a way:

///    \code

///    const Pin at91board_dbgu[] = {

///         {AT91C_BASE_PIOA, 0xC0000000, PIO_PERIPH_A, PIO_DEFAULT}

///    };

///    \endcode

/// -# For pins configured as inputs, the PIO controller must be enabled

///    in the PMC (*enabled by PIO_Configure at the moment*).

/// -# Configure a pin array by calling PIO_Configure, using

///    the PIO_LISTSIZE macro to calculate the array size if needed. Do not

///    forget to check the return value for any error.

/// -# Set and get the value of a pin using the PIO_Set, PIO_Clear and

///    PIO_Get methods.

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

#ifndef PIO_H

#define PIO_H

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

//         Headers

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

#include <board.h>

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

//         Definitions

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

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

/// \page "Pin types" 

/// This page lists the available types for a Pin instance (in its type field).

/// !Types

/// - PIO_PERIPH_A 

/// - PIO_PERIPH_B 

/// - PIO_INPUT 

/// - PIO_OUTPUT_0 

/// - PIO_OUTPUT_1 

/// The pin is controlled by the associated signal of peripheral A.

#define PIO_PERIPH_A                0

/// The pin is controlled by the associated signal of peripheral B.

#define PIO_PERIPH_B                1

/// The pin is an input.

#define PIO_INPUT                   2

/// The pin is an output and has a default level of 0.

#define PIO_OUTPUT_0                3

/// The pin is an output and has a default level of 1.

#define PIO_OUTPUT_1                4

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

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

/// \page "Pin attributes"

/// This page lists the valid values for the attribute field of a Pin instance.

/// !Attributes

/// - PIO_DEFAULT

/// - PIO_PULLUP

/// - PIO_DEGLITCH

/// - PIO_OPENDRAIN

/// Default pin configuration (no attribute).

#define PIO_DEFAULT                 (0 << 0)

/// The internal pin pull-up is active.

#define PIO_PULLUP                  (1 << 0)

/// The internal glitch filter is active.

#define PIO_DEGLITCH                (1 << 1)

/// The pin is open-drain.

#define PIO_OPENDRAIN               (1 << 2)

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

/// Calculates the size of a Pin instances array. The array must be local (i.e.

/// not a pointer), otherwise the computation will not be correct.

#define PIO_LISTSIZE(list)    (sizeof(list) / sizeof(Pin))

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

//         Types

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

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

/// Describes the type and attribute of one PIO pin or a group of similar pins.

typedef struct {

    /// Bitmask indicating which pin(s) to configure.

    unsigned int mask;

    /// Pointer to the PIO controller which has the pin(s).

    AT91S_PIO    *pio;

    /// Peripheral ID of the PIO controller which has the pin(s).

    unsigned char id;

    /// Pin type (see "Pin types").

    unsigned char type;

    /// Pin attribute (see "Pin attributes").

    unsigned char attribute;

} Pin;

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

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

//         Exported functions

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

extern unsigned char PIO_Configure(const Pin *list, unsigned int size);

extern void PIO_Set(const Pin *pin );

extern void PIO_Clear(const Pin *pin);

extern unsigned char PIO_Get(const Pin *pin);

extern unsigned int PIO_GetISR(const Pin *pin);

extern unsigned char PIO_GetOutputDataStatus(const Pin *pin);

#endif //#ifndef PIO_H