/* ---------------------------------------------------------------------------- * ATMEL Microcontroller Software Support * ---------------------------------------------------------------------------- * Copyright (c) 2010, 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. * ---------------------------------------------------------------------------- */ /** * \file * * \section 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. * * \section 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), * REG_PIOA, * 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_ #define _PIO_ /* * Headers */ #include "chip.h" #include /* * 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 controlled by the associated signal of peripheral C. */ #define PIO_PERIPH_C 2 /* The pin is controlled by the associated signal of peripheral D. */ #define PIO_PERIPH_D 3 /* The pin is an input. */ #define PIO_INPUT 4 /* The pin is an output and has a default level of 0. */ #define PIO_OUTPUT_0 5 /* The pin is an output and has a default level of 1. */ #define PIO_OUTPUT_1 6 /* 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) /* The internal debouncing filter is active. */ #define PIO_DEBOUNCE (1 << 3) /* Enable additional interrupt modes. */ #define PIO_IT_AIME (1 << 4) /* Interrupt High Level/Rising Edge detection is active. */ #define PIO_IT_RE_OR_HL (1 << 5) /* Interrupt Edge detection is active. */ #define PIO_IT_EDGE (1 << 6) /* Low level interrupt is active */ #define PIO_IT_LOW_LEVEL (0 | 0 | PIO_IT_AIME) /* High level interrupt is active */ #define PIO_IT_HIGH_LEVEL (PIO_IT_RE_OR_HL | 0 | PIO_IT_AIME) /* Falling edge interrupt is active */ #define PIO_IT_FALL_EDGE (0 | PIO_IT_EDGE | PIO_IT_AIME) /* Rising edge interrupt is active */ #define PIO_IT_RISE_EDGE (PIO_IT_RE_OR_HL | PIO_IT_EDGE | PIO_IT_AIME) #ifdef __cplusplus extern "C" { #endif /* * 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_DEBOUNCE * - PIO_OPENDRAIN * - PIO_IT_LOW_LEVEL * - PIO_IT_HIGH_LEVEL * - PIO_IT_FALL_EDGE * - PIO_IT_RISE_EDGE */ typedef struct _Pin { /* Bitmask indicating which pin(s) to configure. */ uint32_t mask; /* Pointer to the PIO controller which has the pin(s). */ Pio *pio; /* Peripheral ID of the PIO controller which has the pin(s). */ uint8_t id; /* Pin type. */ uint8_t type; /* Pin attribute. */ uint8_t attribute; } Pin ; /* * Global Access Macros */ /* * Global Functions */ extern uint8_t PIO_Configure( const Pin *list, uint32_t size ) ; extern void PIO_Set( const Pin *pin ) ; extern void PIO_Clear( const Pin *pin ) ; extern uint8_t PIO_Get( const Pin *pin ) ; extern uint8_t PIO_GetOutputDataStatus( const Pin *pin ) ; extern void PIO_SetDebounceFilter( const Pin *pin, uint32_t cuttoff ); #ifdef __cplusplus } #endif #endif /* #ifndef _PIO_ */