85 lines
3.0 KiB
Plaintext
85 lines
3.0 KiB
Plaintext
/*
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ChibiOS - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012,2013,2014 Giovanni Di Sirio.
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This file is part of ChibiOS/HAL
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ChibiOS/HAL 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 EXT EXT Driver
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* @brief Generic EXT Driver.
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* @details This module implements a generic EXT (EXTernal) driver.
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* @pre In order to use the EXT driver the @p HAL_USE_EXT option
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* must be enabled in @p halconf.h.
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*
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* @section ext_1 Driver State Machine
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* The driver implements a state machine internally, not all the driver
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* functionalities can be used in any moment, any transition not explicitly
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* shown in the following diagram has to be considered an error and shall
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* be captured by an assertion (if enabled).
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* @if LATEX_PDF
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* @dot
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digraph example {
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size="5, 7";
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rankdir="LR";
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node [shape=circle, fontname=Sans, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
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edge [fontname=Sans, fontsize=8];
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uninit [label="EXT_UNINIT", style="bold"];
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stop [label="EXT_STOP\nLow Power"];
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active [label="EXT_ACTIVE"];
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uninit -> stop [label="extInit()"];
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stop -> stop [label="\nextStop()"];
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stop -> active [label="\nextStart()"];
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active -> stop [label="\nextStop()"];
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active -> active [label="\nextStart()"];
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}
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* @enddot
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* @else
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* @dot
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digraph example {
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rankdir="LR";
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node [shape=circle, fontname=Sans, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
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edge [fontname=Sans, fontsize=8];
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uninit [label="EXT_UNINIT", style="bold"];
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stop [label="EXT_STOP\nLow Power"];
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active [label="EXT_ACTIVE"];
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uninit -> stop [label="extInit()"];
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stop -> stop [label="\nextStop()"];
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stop -> active [label="\nextStart()"];
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active -> stop [label="\nextStop()"];
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active -> active [label="\nextStart()"];
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}
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* @enddot
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* @endif
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*
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* @section ext_2 EXT Operations.
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* This driver abstracts generic external interrupt sources, a callback
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* is invoked when a programmable transition is detected on one of the
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* configured channels. Several channel modes are possible.
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* - <b>EXT_CH_MODE_DISABLED</b>, channel not used.
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* - <b>EXT_CH_MODE_RISING_EDGE</b>, callback on a rising edge.
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* - <b>EXT_CH_MODE_FALLING_EDGE</b>, callback on a falling edge.
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* - <b>EXT_CH_MODE_BOTH_EDGES</b>, callback on a both edges.
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* .
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* @ingroup IO
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*/
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