198 lines
6.8 KiB
C
198 lines
6.8 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2007 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 ports/ARM7-AT91SAM7X/pal_lld.h
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* @brief AT91SAM7X PIO low level driver
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* @addtogroup AT91SAM7X_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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#ifndef AT91SAM7X256_H
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#include "at91lib/AT91SAM7X256.h"
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#endif
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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 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 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 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 IOPORT_A AT91C_BASE_PIOA
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/**
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* @brief PIO port B identifier.
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*/
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#define IOPORT_B AT91C_BASE_PIOB
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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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* @details Clocks are enabled and both PIO ports are reset to a known state
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* and all pads are enabled a digital I/Os.
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*
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* @note The other PIO registers are not modified, the PIOs are supposed to
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* have just been reset. The PIO_PSR is cleared because its status
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* after the reset is not very clear in the documentation.
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*/
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#define pal_lld_init() { \
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AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_PIOA) | (1 << AT91C_ID_PIOB); \
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AT91C_BASE_PIOA->PIO_PER = 0xFFFFFFFF; \
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AT91C_BASE_PIOB->PIO_PER = 0xFFFFFFFF; \
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}
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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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* @note This function is not meant to be invoked directly by the application
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* code.
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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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* @note This function is not meant to be invoked directly by the application
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* code.
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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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* @note This function is not meant to be invoked directly by the application
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* code.
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*/
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#define pal_lld_writeport(port, bits) { \
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(port)->PIO_ODSR = (bits); \
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}
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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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* @note This function is not meant to be invoked directly by the application
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* code.
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*/
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#define pal_lld_setport(port, bits) { \
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(port)->PIO_SODR = (bits); \
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}
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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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* @note This function is not meant to be invoked directly by the application
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* code.
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*/
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#define pal_lld_clearport(port, bits) { \
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(port)->PIO_CODR = (bits); \
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}
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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 width
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* are masked.
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*
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* @note This function is not meant to be invoked directly by the application
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* code.
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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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/**
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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[out] bit the logical value, the value must be @p 0 or @p 1
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*
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* @note This function is not meant to be invoked directly by the application
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* code.
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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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#endif /* _PAL_LLD_H_ */
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/** @} */
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