81 lines
2.8 KiB
Plaintext
81 lines
2.8 KiB
Plaintext
/*
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ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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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 HAL_NORMAL_DRIVERS
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*/
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