pio.h
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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
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
- * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- * ----------------------------------------------------------------------------
- */
- //------------------------------------------------------------------------------
- /// unit
- ///
- /// !!!Purpose
- ///
- /// This file provides a basic API for PIO configuration and usage of
- /// user-controlled pins. Please refer to the board.h file for a list of
- /// available pin definitions.
- ///
- /// !!!Usage
- ///
- /// -# Define a constant pin description array such as the following one, using
- /// the existing definitions provided by the board.h file if possible:
- /// code
- /// const Pin pPins[] = {PIN_USART0_TXD, PIN_USART0_RXD};
- /// endcode
- /// Alternatively, it is possible to add new pins by provided the full Pin
- /// structure:
- /// code
- /// // Pin instance to configure PA10 & PA11 as inputs with the internal
- /// // pull-up enabled.
- /// const Pin pPins = {
- /// (1 << 10) | (1 << 11),
- /// AT91C_BASE_PIOA,
- /// AT91C_ID_PIOA,
- /// PIO_INPUT,
- /// PIO_PULLUP
- /// };
- /// endcode
- /// -# Configure a pin array by calling PIO_Configure() with a pointer to the
- /// array and its size (which is computed using the PIO_LISTSIZE macro).
- /// -# Change and get the value of a user-controlled pin using the PIO_Set,
- /// PIO_Clear and PIO_Get methods.
- /// -# Get the level being currently output by a user-controlled pin configured
- /// as an output using PIO_GetOutputDataStatus().
- //------------------------------------------------------------------------------
-
- #ifndef PIO_H
- #define PIO_H
- //------------------------------------------------------------------------------
- // Headers
- //------------------------------------------------------------------------------
- #include <board.h>
- //------------------------------------------------------------------------------
- // Global Definitions
- //------------------------------------------------------------------------------
- /// 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
- /// 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)
- //------------------------------------------------------------------------------
- // Global Macros
- //------------------------------------------------------------------------------
- //------------------------------------------------------------------------------
- /// Calculates the size of an array of Pin instances. The array must be defined
- /// locally (i.e. not a pointer), otherwise the computation will not be correct.
- /// param pPins Local array of Pin instances.
- /// return Number of elements in array.
- //------------------------------------------------------------------------------
- #define PIO_LISTSIZE(pPins) (sizeof(pPins) / sizeof(Pin))
- //------------------------------------------------------------------------------
- // Global Types
- //------------------------------------------------------------------------------
- //------------------------------------------------------------------------------
- /// Describes the type and attribute of one PIO pin or a group of similar pins.
- /// The #type# field can have the following values:
- /// - PIO_PERIPH_A
- /// - PIO_PERIPH_B
- /// - PIO_OUTPUT_0
- /// - PIO_OUTPUT_1
- /// - PIO_INPUT
- ///
- /// The #attribute# field is a bitmask that can either be set to PIO_DEFAULt,
- /// or combine (using bitwise OR '|') any number of the following constants:
- /// - PIO_PULLUP
- /// - PIO_DEGLITCH
- /// - PIO_OPENDRAIN
- //------------------------------------------------------------------------------
- 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.
- unsigned char type;
- /// Pin attribute.
- unsigned char attribute;
- } Pin;
- //------------------------------------------------------------------------------
- // Global 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