95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
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/*
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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 pal.c
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* @brief I/O Ports Abstraction Layer code
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* @addtogroup PAL
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* @{
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*/
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#include <ch.h>
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#include <pal.h>
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/**
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* @brief Read from an I/O bus.
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*
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* @param[in] bus the I/O bus, pointer to a @p IOBus structure
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* @return The bus logical states.
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*
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* @note The operation is not guaranteed to be atomic on all the architectures,
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* for atomicity and/or portability reasons you may need to enclose port
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* I/O operations between @p chSysLock() and @p chSysUnlock().
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* @note The function internally uses the @p palReadGroup() macro. The use of
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* this function is preferred when you value code size, readability and
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* error checking over speed.
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*/
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ioportmask_t palReadBus(IOBus *bus) {
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chDbgCheck((bus != NULL) &&
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(bus->bus_offset > PAL_IOPORTS_WIDTH), "palReadBus");
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return palReadGroup(bus->bus_portid, bus->bus_mask, bus->bus_offset);
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}
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/**
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* @brief Write to an I/O bus.
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*
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* @param[in] bus the I/O bus, pointer to a @p IOBus structure
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* @param[in] bits the bits to be written on the I/O bus. Values exceeding
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* the bus width are masked so most significant bits are lost.
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*
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* @note The operation is not guaranteed to be atomic on all the architectures,
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* for atomicity and/or portability reasons you may need to enclose port
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* I/O operations between @p chSysLock() and @p chSysUnlock().
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* @note The default implementation is non atomic and not necessarily
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* optimal. Low level drivers may optimize the function by using
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* specific hardware or coding.
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*/
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void palWriteBus(IOBus *bus, ioportmask_t bits) {
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chDbgCheck((bus != NULL) &&
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(bus->bus_offset > PAL_IOPORTS_WIDTH), "palWriteBus");
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palWriteGroup(bus->bus_portid, bus->bus_mask, bus->bus_offset, bits);
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}
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/**
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* @brief Programs a bus with the specified mode.
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*
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* @param[in] bus the I/O bus, pointer to a @p IOBus structure
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* @param[in] mode the mode
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*
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* @note The operation is not guaranteed to be atomic on all the architectures,
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* for atomicity and/or portability reasons you may need to enclose port
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* I/O operations between @p chSysLock() and @p chSysUnlock().
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* @note The default implementation is non atomic and not necessarily
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* optimal. Low level drivers may optimize the function by using
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* specific hardware or coding.
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*/
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void palSetBusMode(IOBus *bus, uint_fast8_t mode) {
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chDbgCheck((bus != NULL) &&
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(bus->bus_offset > PAL_IOPORTS_WIDTH), "palSetBusMode");
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palSetGroupMode(bus->bus_portid, bus->bus_mask, mode);
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}
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/** @} */
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