84 lines
3.2 KiB
Plaintext
84 lines
3.2 KiB
Plaintext
/*
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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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* @defgroup IO HAL
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* @brief Hardware Abstraction Layer.
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* @details Under ChibiOS/RT the set of the various device driver interfaces
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* is called the HAL subsystem: Hardware Abstraction Layer. The HAL is the
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* abstract interface between ChibiOS/RT application and hardware.
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*
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* @section hal_device_driver_arch HAL Device Drivers Architecture
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* A device driver is usually split in two layers:
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* - High Level Device Driver (<b>HLD</b>). This layer contains the definitions
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* of the driver's APIs and the platform independent part of the driver.<br>
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* An HLD is composed by two files:
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* - @p @<driver@>.c, the HLD implementation file. This file must be
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* included in the Makefile in order to use the driver.
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* - @p @<driver@>.h, the HLD header file. This file is implicitly
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* included by the HAL header file @p hal.h.
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* .
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* - Low Level Device Driver (<b>LLD</b>). This layer contains the platform
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* dependent part of the driver.<br>
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* A LLD is composed by two files:
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* - @p @<driver@>_lld.c, the LLD implementation file. This file must be
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* included in the Makefile in order to use the driver.
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* - @p @<driver@>_lld.h, the LLD header file. This file is implicitly
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* included by the HLD header file.
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* .
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* The LLD may be not present in those drivers that do not access the
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* hardware directly but through other device drivers, as example the
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* MMC_SPI driver uses the SPI and PAL drivers in order to implement
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* its functionalities.
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* .
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* @subsection hal_device_driver_diagram Diagram
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* @dot
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digraph example {
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graph [size="5, 7", pad="1.5, 0"];
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node [shape=rectangle, fontname=Helvetica, fontsize=8,
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fixedsize="true", width="2.0", height="0.4"];
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edge [fontname=Helvetica, fontsize=8];
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app [label="Application"];
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hld [label="High Level Driver"];
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lld [label="Low Level Driver"];
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hw [label="Microcontroller Hardware"];
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hal_lld [label="HAL shared low level code"];
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app->hld;
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hld->lld;
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lld-> hw;
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lld->hal_lld;
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hal_lld->hw;
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}
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* @enddot
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*/
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/**
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* @defgroup HAL_CONF Configuration
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* @brief @ref HAL Configuration.
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* @details The file @p halconf.h contains the high level settings for all
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* the drivers supported by the HAL. The low level, platform dependent,
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* settings are contained in the @p mcuconf.h file instead and are describe
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* in the various platforms reference manuals.
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*
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* @ingroup IO
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*/
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