Diff: TARGET_SAMR21G18A/TOOLCHAIN_GCC_ARM/extint.h

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Parent:

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+/**
+ * \file
+ *
+ * \brief SAM External Interrupt Driver
+ *
+ * Copyright (C) 2012-2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ *    Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+/*
+ * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
+ */
+#ifndef EXTINT_H_INCLUDED
+#define EXTINT_H_INCLUDED
+
+/**
+ * \defgroup asfdoc_sam0_extint_group SAM External Interrupt Driver (EXTINT)
+ *
+ * This driver for Atmel&reg; | SMART SAM devices provides an interface for the configuration
+ * and management of external interrupts generated by the physical device pins,
+ * including edge detection. The following driver API modes are covered by this
+ * manual:
+ *
+ *  - Polled APIs
+ * \if EXTINT_CALLBACK_MODE
+ *  - Callback APIs
+ * \endif
+ *
+ * The following peripherals are used by this module:
+ *  - EIC (External Interrupt Controller)
+ *
+ * The following devices can use this module:
+ *  - Atmel | SMART SAM D20/D21
+ *  - Atmel | SMART SAM R21
+ *  - Atmel | SMART SAM D10/D11
+ *  - Atmel | SMART SAM L21
+ *  - Atmel | SMART SAM DAx
+ *  - Atmel | SMART SAM C20/C21
+ *
+ * The outline of this documentation is as follows:
+ *  - \ref asfdoc_sam0_extint_prerequisites
+ *  - \ref asfdoc_sam0_extint_module_overview
+ *  - \ref asfdoc_sam0_extint_special_considerations
+ *  - \ref asfdoc_sam0_extint_extra_info
+ *  - \ref asfdoc_sam0_extint_examples
+ *  - \ref asfdoc_sam0_extint_api_overview
+ *
+ *
+ * \section asfdoc_sam0_extint_prerequisites Prerequisites
+ *
+ * There are no prerequisites for this module.
+ *
+ *
+ * \section asfdoc_sam0_extint_module_overview Module Overview
+ *
+ * The External Interrupt (EXTINT) module provides a method of asynchronously
+ * detecting rising edge, falling edge or specific level detection on individual
+ * I/O pins of a device. This detection can then be used to trigger a software
+ * interrupt or event, or polled for later use if required. External interrupts
+ * can also optionally be used to automatically wake up the device from sleep
+ * mode, allowing the device to conserve power while still being able to react
+ * to an external stimulus in a timely manner.
+ *
+ * \subsection asfdoc_sam0_extint_logical_channels Logical Channels
+ * The External Interrupt module contains a number of logical channels, each of
+ * which is capable of being individually configured for a given pin routing,
+ * detection mode, and filtering/wake up characteristics.
+ *
+ * Each individual logical external interrupt channel may be routed to a single
+ * physical device I/O pin in order to detect a particular edge or level of the
+ * incoming signal.
+ *
+ * \subsection asfdoc_sam0_extint_module_overview_nmi_chanel NMI Channels
+ *
+ * One or more Non Maskable Interrupt (NMI) channels are provided within each
+ * physical External Interrupt Controller module, allowing a single physical pin
+ * of the device to fire a single NMI interrupt in response to a particular
+ * edge or level stimulus. A NMI cannot, as the name suggests, be disabled in
+ * firmware and will take precedence over any in-progress interrupt sources.
+ *
+ * NMIs can be used to implement critical device features such as forced
+ * software reset or other functionality where the action should be executed in
+ * preference to all other running code with a minimum amount of latency.
+ *
+ * \subsection asfdoc_sam0_extint_module_overview_filtering Input Filtering and Detection
+ *
+ * To reduce the possibility of noise or other transient signals causing
+ * unwanted device wake-ups, interrupts and/or events via an external interrupt
+ * channel, a hardware signal filter can be enabled on individual channels. This
+ * filter provides a Majority-of-Three voter filter on the incoming signal, so
+ * that the input state is considered to be the majority vote of three
+ * subsequent samples of the pin input buffer. The possible sampled input and
+ * resulting filtered output when the filter is enabled is shown in
+ * \ref asfdoc_sam0_extint_filter_table "the table below".
+ *
+ * \anchor asfdoc_sam0_extint_filter_table
+ * <table>
+ *  <caption>Sampled Input and Rresulting Filtered Output</caption>
+ *  <tr>
+ *      <th>Input Sample 1</th>
+ *      <th>Input Sample 2</th>
+ *      <th>Input Sample 3</th>
+ *      <th>Filtered Output</th>
+ *  </tr>
+ *  <tr>
+ *      <td>0</td> <td>0</td> <td>0</td> <td>0</td>
+ *  </tr>
+ *  <tr>
+ *      <td>0</td> <td>0</td> <td>1</td> <td>0</td>
+ *  </tr>
+ *  <tr>
+ *      <td>0</td> <td>1</td> <td>0</td> <td>0</td>
+ *  </tr>
+ *  <tr>
+ *      <td>0</td> <td>1</td> <td>1</td> <td>1</td>
+ *  </tr>
+ *  <tr>
+ *      <td>1</td> <td>0</td> <td>0</td> <td>0</td>
+ *  </tr>
+ *  <tr>
+ *      <td>1</td> <td>0</td> <td>1</td> <td>1</td>
+ *  </tr>
+ *  <tr>
+ *      <td>1</td> <td>1</td> <td>0</td> <td>1</td>
+ *  </tr>
+ *  <tr>
+ *      <td>1</td> <td>1</td> <td>1</td> <td>1</td>
+ *  </tr>
+ * </table>
+ *
+ * \subsection asfdoc_sam0_extint_module_overview_events Events and Interrupts
+ *
+ * Channel detection states may be polled inside the application for synchronous
+ * detection, or events and interrupts may be used for asynchronous behavior.
+ * Each channel can be configured to give an asynchronous hardware event (which
+ * may in turn trigger actions in other hardware modules) or an asynchronous
+ * software interrupt.
+ *
+ * \note The connection of events between modules requires the use of the
+ *       \ref asfdoc_sam0_events_group "SAM Event System Driver (EVENTS)"
+ *       to route output event of one module to the input event of another.
+ *       For more information on event routing, refer to the event driver
+ *       documentation.
+ *
+ * \subsection asfdoc_sam0_extint_module_overview_physical Physical Connection
+ *
+ * \ref asfdoc_sam0_extint_int_connections "The diagram below" shows how this
+ * module is interconnected within the device.
+ *
+ * \anchor asfdoc_sam0_extint_int_connections
+ * \dot
+ * digraph overview {
+ *   node [label="Port Pad" shape=square] pad;
+ *
+ *   subgraph driver {
+ *     node [label="Peripheral MUX" shape=trapezium] pinmux;
+ *     node [label="EIC Module" shape=ellipse] eic;
+ *     node [label="Other Peripheral Modules" shape=ellipse style=filled fillcolor=lightgray] peripherals;
+ *   }
+ *
+ *   pinmux -> eic;
+ *   pad    -> pinmux;
+ *   pinmux -> peripherals;
+ * }
+ * \enddot
+ *
+ * \section asfdoc_sam0_extint_special_considerations Special Considerations
+ *
+ * Not all devices support disabling of the NMI channel(s) detection mode - see
+ * your device datasheet.
+ *
+ *
+ * \section asfdoc_sam0_extint_extra_info Extra Information
+ *
+ * For extra information, see \ref asfdoc_sam0_extint_extra. This includes:
+ *  - \ref asfdoc_sam0_extint_extra_acronyms
+ *  - \ref asfdoc_sam0_extint_extra_dependencies
+ *  - \ref asfdoc_sam0_extint_extra_errata
+ *  - \ref asfdoc_sam0_extint_extra_history
+ *
+ *
+ * \section asfdoc_sam0_extint_examples Examples
+ *
+ * For a list of examples related to this driver, see
+ * \ref asfdoc_sam0_extint_exqsg.
+ *
+ *
+ * \section asfdoc_sam0_extint_api_overview API Overview
+ * @{
+ */
+
+#include <compiler.h>
+#include <pinmux.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief External interrupt edge detection configuration enum.
+ *
+ * Enum for the possible signal edge detection modes of the External
+ * Interrupt Controller module.
+ */
+enum extint_detect {
+    /** No edge detection. Not allowed as a NMI detection mode on some
+     *  devices. */
+    EXTINT_DETECT_NONE    = 0,
+    /** Detect rising signal edges. */
+    EXTINT_DETECT_RISING  = 1,
+    /** Detect falling signal edges. */
+    EXTINT_DETECT_FALLING = 2,
+    /** Detect both signal edges. */
+    EXTINT_DETECT_BOTH    = 3,
+    /** Detect high signal levels. */
+    EXTINT_DETECT_HIGH    = 4,
+    /** Detect low signal levels. */
+    EXTINT_DETECT_LOW     = 5,
+};
+
+/**
+ * \brief External interrupt internal pull configuration enum.
+ *
+ * Enum for the possible pin internal pull configurations.
+ *
+ * \note Disabling the internal pull resistor is not recommended if the driver
+ *       is used in interrupt (callback) mode, due the possibility of floating
+ *       inputs generating continuous interrupts.
+ */
+enum extint_pull {
+    /** Internal pull-up resistor is enabled on the pin. */
+    EXTINT_PULL_UP        = SYSTEM_PINMUX_PIN_PULL_UP,
+    /** Internal pull-down resistor is enabled on the pin. */
+    EXTINT_PULL_DOWN      = SYSTEM_PINMUX_PIN_PULL_DOWN,
+    /** Internal pull resistor is disconnected from the pin. */
+    EXTINT_PULL_NONE      = SYSTEM_PINMUX_PIN_PULL_NONE,
+};
+
+/** The EIC is clocked by GCLK_EIC. */
+#define EXTINT_CLK_GCLK   0
+/** The EIC is clocked by CLK_ULP32K. */
+#define EXTINT_CLK_ULP32K 1
+
+/**
+ * \brief External Interrupt Controller channel configuration structure.
+ *
+ *  Configuration structure for the edge detection mode of an external
+ *  interrupt channel.
+ */
+struct extint_chan_conf {
+    /** GPIO pin the NMI should be connected to. */
+    uint32_t gpio_pin;
+    /** MUX position the GPIO pin should be configured to. */
+    uint32_t gpio_pin_mux;
+    /** Internal pull to enable on the input pin. */
+    enum extint_pull gpio_pin_pull;
+#if (SAML21) || (SAMC20) || (SAMC21)
+    /** Enable asynchronous edge detection. */
+    bool enable_async_edge_detection;
+#else
+    /** Wake up the device if the channel interrupt fires during sleep mode. */
+    bool wake_if_sleeping;
+#endif
+    /** Filter the raw input signal to prevent noise from triggering an
+     *  interrupt accidentally, using a 3 sample majority filter. */
+    bool filter_input_signal;
+    /** Edge detection mode to use. */
+    enum extint_detect detection_criteria;
+};
+
+/**
+ * \brief External Interrupt event enable/disable structure.
+ *
+ * Event flags for the \ref extint_enable_events() and
+ * \ref extint_disable_events().
+ */
+struct extint_events {
+    /** If \c true, an event will be generated when an external interrupt
+     *  channel detection state changes. */
+    bool generate_event_on_detect[32 * EIC_INST_NUM];
+};
+
+/**
+ * \brief External Interrupt Controller NMI configuration structure.
+ *
+ *  Configuration structure for the edge detection mode of an external
+ *  interrupt NMI channel.
+ */
+struct extint_nmi_conf {
+    /** GPIO pin the NMI should be connected to. */
+    uint32_t gpio_pin;
+    /** MUX position the GPIO pin should be configured to. */
+    uint32_t gpio_pin_mux;
+    /** Internal pull to enable on the input pin. */
+    enum extint_pull gpio_pin_pull;
+    /** Filter the raw input signal to prevent noise from triggering an
+     *  interrupt accidentally, using a 3 sample majority filter. */
+    bool filter_input_signal;
+    /** Edge detection mode to use. Not all devices support all possible
+     *  detection modes for NMIs.
+     */
+    enum extint_detect detection_criteria;
+#if (SAML21) || (SAMC20) || (SAMC21)
+    /** Enable asynchronous edge detection. */
+    bool enable_async_edge_detection;
+#endif
+};
+
+#if EXTINT_CALLBACK_MODE == true
+/** Type definition for an EXTINT module callback function. */
+typedef void (*extint_callback_t)(void);
+
+#ifndef EIC_NUMBER_OF_INTERRUPTS
+#  define EIC_NUMBER_OF_INTERRUPTS 16
+#endif
+#endif
+
+#if !defined(__DOXYGEN__)
+/** \internal
+ *  Internal EXTINT module device instance structure definition.
+ */
+struct _extint_module {
+#  if EXTINT_CALLBACK_MODE == true
+    /** Asynchronous channel callback table, for user-registered handlers. */
+    extint_callback_t callbacks[EIC_NUMBER_OF_INTERRUPTS];
+#  else
+    /** Dummy value to ensure the struct has at least one member. */
+    uint8_t _dummy;
+#  endif
+};
+
+/**
+ * \brief Retrieves the base EIC module address from a given channel number.
+ *
+ * Retrieves the base address of a EIC hardware module associated with the
+ * given external interrupt channel.
+ *
+ * \param[in] channel  External interrupt channel index to convert
+ *
+ * \return Base address of the associated EIC module.
+ */
+static inline Eic * _extint_get_eic_from_channel(
+    const uint8_t channel)
+{
+    uint8_t eic_index = (channel / 32);
+
+    if (eic_index < EIC_INST_NUM) {
+        /* Array of available EICs. */
+        Eic *const eics[EIC_INST_NUM] = EIC_INSTS;
+
+        return eics[eic_index];
+    } else {
+        Assert(false);
+        return NULL;
+    }
+}
+
+/**
+ * \brief Retrieves the base EIC module address from a given NMI channel number.
+ *
+ * Retrieves the base address of a EIC hardware module associated with the
+ * given non-maskable external interrupt channel.
+ *
+ * \param[in] nmi_channel  Non-Maskable interrupt channel index to convert
+ *
+ * \return Base address of the associated EIC module.
+ */
+static inline Eic * _extint_get_eic_from_nmi(
+    const uint8_t nmi_channel)
+{
+    uint8_t eic_index = nmi_channel;
+
+    if (eic_index < EIC_INST_NUM) {
+        /* Array of available EICs. */
+        Eic *const eics[EIC_INST_NUM] = EIC_INSTS;
+
+        return eics[eic_index];
+    } else {
+        Assert(false);
+        return NULL;
+    }
+}
+#endif
+
+/** \name Event Management
+ * @{
+ */
+
+void extint_enable_events(
+    struct extint_events *const events);
+
+void extint_disable_events(
+    struct extint_events *const events);
+
+/** @} */
+
+/** \name Configuration and Initialization (Channel)
+ * @{
+ */
+
+void extint_chan_get_config_defaults(
+    struct extint_chan_conf *const config);
+
+void extint_chan_set_config(
+    const uint8_t channel,
+    const struct extint_chan_conf *const config);
+
+/** @} */
+
+/** \name Configuration and Initialization (NMI)
+ * @{
+ */
+
+/**
+ * \brief Initializes an External Interrupt NMI channel configuration structure to defaults.
+ *
+ * Initializes a given External Interrupt NMI channel configuration structure
+ * to a set of known default values. This function should be called on all new
+ * instances of these configuration structures before being modified by the
+ * user application.
+ *
+ * The default configuration is as follows:
+ * \li Input filtering disabled
+ * \li Detect falling edges of a signal
+ * \li Asynchronous edge detection is disabled
+ *
+ * \param[out] config  Configuration structure to initialize to default values
+ */
+static inline void extint_nmi_get_config_defaults(
+    struct extint_nmi_conf *const config)
+{
+    /* Sanity check arguments */
+    Assert(config);
+
+    /* Default configuration values */
+    config->gpio_pin            = 0;
+    config->gpio_pin_mux        = 0;
+    config->gpio_pin_pull       = EXTINT_PULL_UP;
+    config->filter_input_signal = false;
+    config->detection_criteria  = EXTINT_DETECT_FALLING;
+#if (SAML21) || (SAMC20) || (SAMC21)
+    config->enable_async_edge_detection = false;
+#endif
+
+}
+
+enum status_code extint_nmi_set_config(
+    const uint8_t nmi_channel,
+    const struct extint_nmi_conf *const config);
+
+/** @} */
+
+/** \name Detection testing and clearing (channel)
+ * @{
+ */
+
+/**
+ * \brief Retrieves the edge detection state of a configured channel.
+ *
+ *  Reads the current state of a configured channel, and determines
+ *  if the detection criteria of the channel has been met.
+ *
+ *  \param[in] channel  External Interrupt channel index to check
+ *
+ *  \return Status of the requested channel's edge detection state.
+ *  \retval true   If the channel's edge/level detection criteria was met
+ *  \retval false  If the channel has not detected its configured criteria
+ */
+static inline bool extint_chan_is_detected(
+    const uint8_t channel)
+{
+    Eic *const eic_module = _extint_get_eic_from_channel(channel);
+    uint32_t eic_mask   = (1UL << (channel % 32));
+
+    return (eic_module->INTFLAG.reg & eic_mask);
+}
+
+/**
+ * \brief Clears the edge detection state of a configured channel.
+ *
+ *  Clears the current state of a configured channel, readying it for
+ *  the next level or edge detection.
+ *
+ *  \param[in] channel  External Interrupt channel index to check
+ */
+static inline void extint_chan_clear_detected(
+    const uint8_t channel)
+{
+    Eic *const eic_module = _extint_get_eic_from_channel(channel);
+    uint32_t eic_mask   = (1UL << (channel % 32));
+
+    eic_module->INTFLAG.reg = eic_mask;
+}
+
+/** @} */
+
+/** \name Detection Testing and Clearing (NMI)
+ * @{
+ */
+
+/**
+ * \brief Retrieves the edge detection state of a configured NMI channel.
+ *
+ *  Reads the current state of a configured NMI channel, and determines
+ *  if the detection criteria of the NMI channel has been met.
+ *
+ *  \param[in] nmi_channel  External Interrupt NMI channel index to check
+ *
+ *  \return Status of the requested NMI channel's edge detection state.
+ *  \retval true   If the NMI channel's edge/level detection criteria was met
+ *  \retval false  If the NMI channel has not detected its configured criteria
+ */
+static inline bool extint_nmi_is_detected(
+    const uint8_t nmi_channel)
+{
+    Eic *const eic_module = _extint_get_eic_from_nmi(nmi_channel);
+
+    return (eic_module->NMIFLAG.reg & EIC_NMIFLAG_NMI);
+}
+
+/**
+ * \brief Clears the edge detection state of a configured NMI channel.
+ *
+ *  Clears the current state of a configured NMI channel, readying it for
+ *  the next level or edge detection.
+ *
+ *  \param[in] nmi_channel  External Interrupt NMI channel index to check
+ */
+static inline void extint_nmi_clear_detected(
+    const uint8_t nmi_channel)
+{
+    Eic *const eic_module = _extint_get_eic_from_nmi(nmi_channel);
+
+    eic_module->NMIFLAG.reg = EIC_NMIFLAG_NMI;
+}
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+/** @} */
+
+#if EXTINT_CALLBACK_MODE == true
+#  include "extint_callback.h"
+#endif
+
+/**
+ * \page asfdoc_sam0_extint_extra Extra Information for EXTINT Driver
+ *
+ * \section asfdoc_sam0_extint_extra_acronyms Acronyms
+ * The table below presents the acronyms used in this module:
+ *
+ * <table>
+ *  <tr>
+ *      <th>Acronym</th>
+ *      <th>Description</th>
+ *  </tr>
+ *  <tr>
+ *      <td>EIC</td>
+ *      <td>External Interrupt Controller</td>
+ *  </tr>
+ *  <tr>
+ *      <td>MUX</td>
+ *      <td>Multiplexer</td>
+ *  </tr>
+ *  <tr>
+ *      <td>NMI</td>
+ *      <td>Non-Maskable Interrupt</td>
+ *  </tr>
+ * </table>
+ *
+ *
+ * \section asfdoc_sam0_extint_extra_dependencies Dependencies
+ * This driver has the following dependencies:
+ *
+ *  - \ref asfdoc_sam0_system_pinmux_group "System Pin Multiplexer Driver"
+ *
+ *
+ * \section asfdoc_sam0_extint_extra_errata Errata
+ * There are no errata related to this driver.
+ *
+ *
+ * \section asfdoc_sam0_extint_extra_history Module History
+ * An overview of the module history is presented in the table below, with
+ * details on the enhancements and fixes made to the module since its first
+ * release. The current version of this corresponds to the newest version in
+ * the table.
+ *
+ * <table>
+ *  <tr>
+ *      <th>Changelog</th>
+ *  </tr>
+ *  <tr>
+ *      <td>
+ *      \li Driver updated to follow driver type convention.
+ *      \li Removed \c %extint_reset(), \c %extint_disable() and
+ *          \c extint_enable() functions. Added internal function
+ *          \c %_system_extint_init().
+ *      \li Added configuration EXTINT_CLOCK_SOURCE in conf_extint.h.
+ *      \li Removed configuration EXTINT_CALLBACKS_MAX in conf_extint.h, and
+ *          added channel parameter in the register functions
+ *         \c %extint_register_callback() and \c %extint_unregister_callback().
+ *      </td>
+ *  </tr>
+ *  <tr>
+ *      <td>Updated interrupt handler to clear interrupt flag before calling
+ *          callback function.</td>
+ *  </tr>
+ *  <tr>
+ *      <td>Updated initialization function to also enable the digital interface
+ *          clock to the module if it is disabled.</td>
+ *  </tr>
+ *  <tr>
+ *      <td>Initial Release</td>
+ *  </tr>
+ * </table>
+ */
+
+/**
+ * \page asfdoc_sam0_extint_exqsg Examples for EXTINT Driver
+ *
+ * This is a list of the available Quick Start guides (QSGs) and example
+ * applications for \ref asfdoc_sam0_extint_group.
+ * QSGs are simple examples with step-by-step instructions to configure and
+ * use this driver in a selection of use cases. Note that QSGs can be compiled
+ * as a standalone application or be added to the user application.
+ *
+ *  - \subpage asfdoc_sam0_extint_basic_use_case
+ * \if EXTINT_CALLBACK_MODE
+ *  - \subpage asfdoc_sam0_extint_callback_use_case
+ * \endif
+ *
+ * \page asfdoc_sam0_extint_document_revision_history Document Revision History
+ *
+ * <table>
+ *  <tr>
+ *      <th>Doc. Rev.</td>
+ *      <th>Date</td>
+ *      <th>Comments</td>
+ *  </tr>
+ *  <tr>
+ *      <td>E</td>
+ *      <td>06/2015</td>
+ *      <td>Added support for SAML21, SAMC21, and SAMDAx.</td>
+ *  </tr>
+ *  <tr>
+ *      <td>D</td>
+ *      <td>12/2014</td>
+ *      <td>Added support for SAMR21 and SAMD10/D11.</td>
+ *  </tr>
+ *  <tr>
+ *      <td>C</td>
+ *      <td>01/2014</td>
+ *      <td>Added support for SAMD21.</td>
+ *  </tr>
+ *  <tr>
+ *      <td>B</td>
+ *      <td>06/2013</td>
+ *      <td>Added additional documentation on the event system. Corrected
+ *          documentation typos.</td>
+ *  </tr>
+ *  <tr>
+ *      <td>A</td>
+ *      <td>06/2013</td>
+ *      <td>Initial release</td>
+ *  </tr>
+ * </table>
+ */
+
+#endif