254 lines
7.9 KiB
C
254 lines
7.9 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file AT91SAM7/pal_lld.h
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* @brief AT91SAM7 PIO low level driver header.
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*
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* @addtogroup PAL
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* @{
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*/
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#ifndef _PAL_LLD_H_
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#define _PAL_LLD_H_
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#if HAL_USE_PAL || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Unsupported modes and specific modes */
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/*===========================================================================*/
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#undef PAL_MODE_INPUT_PULLDOWN
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/*===========================================================================*/
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/* I/O Ports Types and constants. */
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/*===========================================================================*/
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/**
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* @brief PIO port setup info.
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*/
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typedef struct {
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/** Initial value for ODSR register (data).*/
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uint32_t odsr;
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/** Initial value for OSR register (direction).*/
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uint32_t osr;
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/** Initial value for PUSR register (Pull-ups).*/
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uint32_t pusr;
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} at91sam7_pio_setup_t;
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/**
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* @brief AT91SAM7 PIO static initializer.
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* @details An instance of this structure must be passed to @p palInit() at
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* system startup time in order to initialize the digital I/O
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* subsystem. This represents only the initial setup, specific pads
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* or whole ports can be reprogrammed at later time.
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*/
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typedef struct {
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/** @brief Port 0 setup data.*/
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at91sam7_pio_setup_t P0Data;
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#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
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(SAM7_PLATFORM == SAM7X512) || defined(__DOXYGEN__)
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/** @brief Port 1 setup data.*/
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at91sam7_pio_setup_t P1Data;
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#endif
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} PALConfig;
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/**
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* @brief Width, in bits, of an I/O port.
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*/
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#define PAL_IOPORTS_WIDTH 32
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/**
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* @brief Whole port mask.
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* @details This macro specifies all the valid bits into a port.
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*/
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#define PAL_WHOLE_PORT ((ioportmask_t)0xFFFFFFFF)
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/**
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* @brief Digital I/O port sized unsigned type.
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*/
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typedef uint32_t ioportmask_t;
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/**
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* @brief Digital I/O modes.
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*/
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typedef uint32_t iomode_t;
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/**
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* @brief Port Identifier.
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* @details This type can be a scalar or some kind of pointer, do not make
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* any assumption about it, use the provided macros when populating
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* variables of this type.
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*/
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typedef AT91PS_PIO ioportid_t;
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/*===========================================================================*/
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/* I/O Ports Identifiers. */
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/*===========================================================================*/
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/**
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* @brief PIO port A identifier.
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*/
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#define IOPORT1 AT91C_BASE_PIOA
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/**
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* @brief PIO port B identifier.
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*/
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#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
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(SAM7_PLATFORM == SAM7X512) || defined(__DOXYGEN__)
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#define IOPORT2 AT91C_BASE_PIOB
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#endif
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/*===========================================================================*/
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/* Implementation, some of the following macros could be implemented as */
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/* functions, if so please put them in a file named pal_lld.c. */
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/*===========================================================================*/
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/**
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* @brief Low level PAL subsystem initialization.
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*/
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#define pal_lld_init(config) _pal_lld_init(config)
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/**
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* @brief Reads the physical I/O port states.
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* @details This function is implemented by reading the PIO_PDSR register, the
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* implementation has no side effects.
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*
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* @param[in] port the port identifier
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* @return The port bits.
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*
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* @notapi
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*/
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#define pal_lld_readport(port) ((port)->PIO_PDSR)
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/**
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* @brief Reads the output latch.
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* @details This function is implemented by reading the PIO_ODSR register, the
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* implementation has no side effects.
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*
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* @param[in] port the port identifier
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* @return The latched logical states.
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*
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* @notapi
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*/
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#define pal_lld_readlatch(port) ((port)->PIO_ODSR)
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/**
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* @brief Writes a bits mask on a I/O port.
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* @details This function is implemented by writing the PIO_ODSR register, the
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* implementation has no side effects.
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*
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* @param[in] port the port identifier
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* @param[in] bits the bits to be written on the specified port
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*
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* @notapi
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*/
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#define pal_lld_writeport(port, bits) ((port)->PIO_ODSR = (bits))
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/**
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* @brief Sets a bits mask on a I/O port.
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* @details This function is implemented by writing the PIO_SODR register, the
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* implementation has no side effects.
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*
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* @param[in] port the port identifier
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* @param[in] bits the bits to be ORed on the specified port
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*
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* @notapi
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*/
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#define pal_lld_setport(port, bits) ((port)->PIO_SODR = (bits))
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/**
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* @brief Clears a bits mask on a I/O port.
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* @details This function is implemented by writing the PIO_CODR register, the
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* implementation has no side effects.
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*
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* @param[in] port the port identifier
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* @param[in] bits the bits to be cleared on the specified port
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*
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* @notapi
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*/
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#define pal_lld_clearport(port, bits) ((port)->PIO_CODR = (bits))
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/**
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* @brief Writes a group of bits.
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* @details This function is implemented by writing the PIO_OWER, PIO_ODSR and
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* PIO_OWDR registers, the implementation is not atomic because the
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* multiple accesses.
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*
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* @param[in] port the port identifier
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* @param[in] mask the group mask
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* @param[in] offset the group bit offset within the port
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* @param[in] bits the bits to be written. Values exceeding the group
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* width are masked.
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*
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* @notapi
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*/
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#define pal_lld_writegroup(port, mask, offset, bits) \
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((port)->PIO_OWER = (mask) << (offset), \
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(port)->PIO_ODSR = (bits) << (offset), \
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(port)->PIO_OWDR = (mask) << (offset))
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/**
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* @brief Pads group mode setup.
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* @details This function programs a pads group belonging to the same port
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* with the specified mode.
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* @note @p PAL_MODE_UNCONNECTED is implemented as push pull output with
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* high state.
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*
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* @param[in] port the port identifier
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* @param[in] mask the group mask
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* @param[in] mode the mode
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*
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* @notapi
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*/
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#define pal_lld_setgroupmode(port, mask, mode) \
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_pal_lld_setgroupmode(port, mask, mode)
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/**
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* @brief Writes a logical state on an output pad.
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*
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* @param[in] port the port identifier
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* @param[in] pad the pad number within the port
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* @param[in] bit logical value, the value must be @p PAL_LOW or
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* @p PAL_HIGH
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*
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* @notapi
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*/
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#define pal_lld_writepad(port, pad, bit) pal_lld_writegroup(port, 1, pad, bit)
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extern const PALConfig pal_default_config;
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#ifdef __cplusplus
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extern "C" {
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#endif
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void _pal_lld_init(const PALConfig *config);
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void _pal_lld_setgroupmode(ioportid_t port,
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ioportmask_t mask,
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iomode_t mode);
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#ifdef __cplusplus
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}
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#endif
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#endif /* HAL_USE_PAL */
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#endif /* _PAL_LLD_H_ */
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/** @} */
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