From d4c616e6eeb0587ca450c75b1086efa77ac690e5 Mon Sep 17 00:00:00 2001 From: gdisirio Date: Sun, 29 Nov 2009 08:50:13 +0000 Subject: git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1351 35acf78f-673a-0410-8e92-d51de3d6d3f4 --- os/hal/src/pal.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 os/hal/src/pal.c (limited to 'os/hal/src/pal.c') diff --git a/os/hal/src/pal.c b/os/hal/src/pal.c new file mode 100644 index 000000000..1f9d058d5 --- /dev/null +++ b/os/hal/src/pal.c @@ -0,0 +1,98 @@ +/* + ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio. + + This file is part of ChibiOS/RT. + + ChibiOS/RT is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + ChibiOS/RT is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . +*/ + +/** + * @file pal.c + * @brief I/O Ports Abstraction Layer code + * @addtogroup PAL + * @{ + */ + +#include "ch.h" +#include "hal.h" + +#if CH_HAL_USE_PAL + +/** + * @brief Read from an I/O bus. + * + * @param[in] bus the I/O bus, pointer to a @p IOBus structure + * @return The bus logical states. + * + * @note The operation is not guaranteed to be atomic on all the architectures, + * for atomicity and/or portability reasons you may need to enclose port + * I/O operations between @p chSysLock() and @p chSysUnlock(). + * @note The function internally uses the @p palReadGroup() macro. The use of + * this function is preferred when you value code size, readability and + * error checking over speed. + */ +ioportmask_t palReadBus(IOBus *bus) { + + chDbgCheck((bus != NULL) && + (bus->bus_offset > PAL_IOPORTS_WIDTH), "palReadBus"); + + return palReadGroup(bus->bus_portid, bus->bus_mask, bus->bus_offset); +} + +/** + * @brief Write to an I/O bus. + * + * @param[in] bus the I/O bus, pointer to a @p IOBus structure + * @param[in] bits the bits to be written on the I/O bus. Values exceeding + * the bus width are masked so most significant bits are lost. + * + * @note The operation is not guaranteed to be atomic on all the architectures, + * for atomicity and/or portability reasons you may need to enclose port + * I/O operations between @p chSysLock() and @p chSysUnlock(). + * @note The default implementation is non atomic and not necessarily + * optimal. Low level drivers may optimize the function by using + * specific hardware or coding. + */ +void palWriteBus(IOBus *bus, ioportmask_t bits) { + + chDbgCheck((bus != NULL) && + (bus->bus_offset > PAL_IOPORTS_WIDTH), "palWriteBus"); + + palWriteGroup(bus->bus_portid, bus->bus_mask, bus->bus_offset, bits); +} + +/** + * @brief Programs a bus with the specified mode. + * + * @param[in] bus the I/O bus, pointer to a @p IOBus structure + * @param[in] mode the mode + * + * @note The operation is not guaranteed to be atomic on all the architectures, + * for atomicity and/or portability reasons you may need to enclose port + * I/O operations between @p chSysLock() and @p chSysUnlock(). + * @note The default implementation is non atomic and not necessarily + * optimal. Low level drivers may optimize the function by using + * specific hardware or coding. + */ +void palSetBusMode(IOBus *bus, uint_fast8_t mode) { + + chDbgCheck((bus != NULL) && + (bus->bus_offset > PAL_IOPORTS_WIDTH), "palSetBusMode"); + + palSetGroupMode(bus->bus_portid, bus->bus_mask, mode); +} + +#endif /* CH_HAL_USE_PAL */ + +/** @} */ -- cgit v1.2.3