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diff --git a/os/hal/dox/ext.dox b/os/hal/dox/ext.dox
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-/*
-    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
-
-    Licensed under the Apache License, Version 2.0 (the "License");
-    you may not use this file except in compliance with the License.
-    You may obtain a copy of the License at
-
-        http://www.apache.org/licenses/LICENSE-2.0
-
-    Unless required by applicable law or agreed to in writing, software
-    distributed under the License is distributed on an "AS IS" BASIS,
-    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-    See the License for the specific language governing permissions and
-    limitations under the License.
-*/
-
-/**
- * @defgroup EXT EXT Driver
- * @brief   Generic EXT Driver.
- * @details This module implements a generic EXT (EXTernal) driver.
- * @note    This driver is obsolete. Use the Event and Callback functions
- *          of the @ref PAL driver instead.
- * @pre     In order to use the EXT driver the @p HAL_USE_EXT option
- *          must be enabled in @p halconf.h.
- *
- * @section ext_1 Driver State Machine
- * The driver implements a state machine internally, not all the driver
- * functionalities can be used in any moment, any transition not explicitly
- * shown in the following diagram has to be considered an error and shall
- * be captured by an assertion (if enabled).
- * @if LATEX_PDF
- * @dot
-  digraph example {
-    size="5, 7";
-    rankdir="LR";
-
-    node [shape=circle, fontname=Sans, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
-    edge [fontname=Sans, fontsize=8];
-
-    uninit [label="EXT_UNINIT", style="bold"];
-    stop  [label="EXT_STOP\nLow Power"];
-    active [label="EXT_ACTIVE"];
-
-    uninit -> stop [label="extInit()"];
-    stop -> stop [label="\nextStop()"];
-    stop -> active [label="\nextStart()"];
-    active -> stop [label="\nextStop()"];
-    active -> active [label="\nextStart()"];
-  }
- * @enddot
- * @else
- * @dot
-  digraph example {
-    rankdir="LR";
-
-    node [shape=circle, fontname=Sans, fontsize=8, fixedsize="true", width="0.9", height="0.9"];
-    edge [fontname=Sans, fontsize=8];
-
-    uninit [label="EXT_UNINIT", style="bold"];
-    stop  [label="EXT_STOP\nLow Power"];
-    active [label="EXT_ACTIVE"];
-
-    uninit -> stop [label="extInit()"];
-    stop -> stop [label="\nextStop()"];
-    stop -> active [label="\nextStart()"];
-    active -> stop [label="\nextStop()"];
-    active -> active [label="\nextStart()"];
-  }
- * @enddot
- * @endif
- *
- * @section ext_2 EXT Operations.
- * This driver abstracts generic external interrupt sources, a callback
- * is invoked when a programmable transition is detected on one of the
- * configured channels. Several channel modes are possible.
- * - <b>EXT_CH_MODE_DISABLED</b>, channel not used.
- * - <b>EXT_CH_MODE_RISING_EDGE</b>, callback on a rising edge.
- * - <b>EXT_CH_MODE_FALLING_EDGE</b>, callback on a falling edge.
- * - <b>EXT_CH_MODE_BOTH_EDGES</b>, callback on a both edges.
- * .
- * @ingroup HAL_NORMAL_DRIVERS
- */