504 lines
17 KiB
C
504 lines
17 KiB
C
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/**
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* \file
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*
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* \brief SAM Watchdog Driver
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*
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* Copyright (c) 2012-2016 Atmel Corporation. All rights reserved.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of Atmel may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* 4. This software may only be redistributed and used in connection with an
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* Atmel microcontroller product.
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*
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* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* \asf_license_stop
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*
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*/
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/*
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* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
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*/
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#ifndef WDT_H_INCLUDED
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#define WDT_H_INCLUDED
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/**
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* \defgroup asfdoc_sam0_wdt_group SAM Watchdog (WDT) Driver
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*
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* This driver for Atmel® | SMART ARM®-based microcontrollers provides
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* an interface for the configuration and management of the device's Watchdog
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* Timer module, including the enabling, disabling, and kicking within the device.
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* The following driver API modes are covered by this manual:
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*
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* - Polled APIs
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* \if WDT_CALLBACK_MODE
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* - Callback APIs
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* \endif
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*
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* The following peripherals are used by this module:
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* - WDT (Watchdog Timer)
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*
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* The following devices can use this module:
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* - Atmel | SMART SAM D20/D21
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* - Atmel | SMART SAM R21
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* - Atmel | SMART SAM D09/D10/D11
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* - Atmel | SMART SAM L21/L22
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* - Atmel | SMART SAM DA1
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* - Atmel | SMART SAM C20/C21
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* - Atmel | SMART SAM HA1
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* - Atmel | SMART SAM R30
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*
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* The outline of this documentation is as follows:
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* - \ref asfdoc_sam0_wdt_prerequisites
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* - \ref asfdoc_sam0_wdt_module_overview
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* - \ref asfdoc_sam0_wdt_special_considerations
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* - \ref asfdoc_sam0_wdt_extra_info
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* - \ref asfdoc_sam0_wdt_examples
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* - \ref asfdoc_sam0_wdt_api_overview
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*
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*
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* \section asfdoc_sam0_wdt_prerequisites Prerequisites
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*
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* There are no prerequisites for this module.
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*
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*
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* \section asfdoc_sam0_wdt_module_overview Module Overview
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*
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* The Watchdog module (WDT) is designed to give an added level of safety in
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* critical systems, to ensure a system reset is triggered in the case of a
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* deadlock or other software malfunction that prevents normal device operation.
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*
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* At a basic level, the Watchdog is a system timer with a fixed period; once
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* enabled, it will continue to count ticks of its asynchronous clock until
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* it is periodically reset, or the timeout period is reached. In the event of a
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* Watchdog timeout, the module will trigger a system reset identical to a pulse
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* of the device's reset pin, resetting all peripherals to their power-on
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* default states and restarting the application software from the reset vector.
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*
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* In many systems, there is an obvious upper bound to the amount of time each
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* iteration of the main application loop can be expected to run, before a
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* malfunction can be assumed (either due to a deadlock waiting on hardware or
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* software, or due to other means). When the Watchdog is configured with a
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* timeout period equal to this upper bound, a malfunction in the system will
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* force a full system reset to allow for a graceful recovery.
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*
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* \subsection asfdoc_sam0_wdt_module_locked_mode Locked Mode
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* The Watchdog configuration can be set in the device fuses and locked in
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* hardware, so that no software changes can be made to the Watchdog
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* configuration. Additionally, the Watchdog can be locked on in software if it
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* is not already locked, so that the module configuration cannot be modified
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* until a power on reset of the device.
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*
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* The locked configuration can be used to ensure that faulty software does not
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* cause the Watchdog configuration to be changed, preserving the level of
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* safety given by the module.
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*
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* \subsection asfdoc_sam0_wdt_module_window_mode Window Mode
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* Just as there is a reasonable upper bound to the time the main program loop
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* should take for each iteration, there is also in many applications a lower
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* bound, i.e. a \a minimum time for which each loop iteration should run for
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* under normal circumstances. To guard against a system failure resetting the
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* Watchdog in a tight loop (or a failure in the system application causing the
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* main loop to run faster than expected) a "Window" mode can be enabled to
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* disallow resetting of the Watchdog counter before a certain period of time.
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* If the Watchdog is not reset \a after the window opens but not \a before the
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* Watchdog expires, the system will reset.
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*
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* \subsection asfdoc_sam0_wdt_module_early_warning Early Warning
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* In some cases it is desirable to receive an early warning that the Watchdog is
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* about to expire, so that some system action (such as saving any system
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* configuration data for failure analysis purposes) can be performed before the
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* system reset occurs. The Early Warning feature of the Watchdog module allows
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* such a notification to be requested; after the configured early warning time
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* (but before the expiry of the Watchdog counter) the Early Warning flag will
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* become set, so that the user application can take an appropriate action.
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*
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* \note It is important to note that the purpose of the Early Warning feature
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* is \a not to allow the user application to reset the Watchdog; doing
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* so will defeat the safety the module gives to the user application.
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* Instead, this feature should be used purely to perform any tasks that
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* need to be undertaken before the system reset occurs.
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*
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* \subsection asfdoc_sam0_wdt_module_overview_physical Physical Connection
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*
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* \ref asfdoc_sam0_wdt_module_int_connections "The figure below" shows how
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* this module is interconnected within the device.
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*
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* \anchor asfdoc_sam0_wdt_module_int_connections
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* \dot
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* digraph overview {
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* rankdir=LR;
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* node [label="GCLK*\nGeneric Clock" shape=square] wdt_clock;
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*
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* subgraph driver {
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* node [label="<f0> WDT | <f1> Watchdog Counter" shape=record] wdt_module;
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* node [label="System Reset Logic" shape=ellipse style=filled fillcolor=lightgray] sys_reset;
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* }
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*
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* wdt_clock -> wdt_module:f1;
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* wdt_module:f1 -> sys_reset;
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* }
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* \enddot
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*
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* \note Watchdog Counter of SAM L21/L22/R30 is \a not provided by GCLK, but it uses an
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* internal 1KHz OSCULP32K output clock.
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*
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* \section asfdoc_sam0_wdt_special_considerations Special Considerations
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*
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* On some devices the Watchdog configuration can be fused to be always on in
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* a particular configuration; if this mode is enabled the Watchdog is not
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* software configurable and can have its count reset and early warning state
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* checked/cleared only.
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*
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* \section asfdoc_sam0_wdt_extra_info Extra Information
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*
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* For extra information, see \ref asfdoc_sam0_wdt_extra. This includes:
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* - \ref asfdoc_sam0_wdt_extra_acronyms
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* - \ref asfdoc_sam0_wdt_extra_dependencies
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* - \ref asfdoc_sam0_wdt_extra_errata
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* - \ref asfdoc_sam0_wdt_extra_history
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*
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*
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* \section asfdoc_sam0_wdt_examples Examples
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*
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* For a list of examples related to this driver, see
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* \ref asfdoc_sam0_wdt_exqsg.
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*
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* \section asfdoc_sam0_wdt_api_overview API Overview
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* @{
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*/
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#include <compiler.h>
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#include <clock.h>
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#include <gclk.h>
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#if WDT_CALLBACK_MODE == true
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# include "wdt_callback.h"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Watchdog Timer period configuration enum.
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*
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* Enum for the possible period settings of the Watchdog timer module, for
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* values requiring a period as a number of Watchdog timer clock ticks.
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*/
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enum wdt_period {
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/** No Watchdog period. This value can only be used when setting the
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* Window and Early Warning periods; its use as the Watchdog Reset
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* Period is invalid. */
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WDT_PERIOD_NONE = 0,
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/** Watchdog period of 8 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_8CLK = 1,
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/** Watchdog period of 16 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_16CLK = 2,
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/** Watchdog period of 32 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_32CLK = 3,
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/** Watchdog period of 64 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_64CLK = 4,
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/** Watchdog period of 128 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_128CLK = 5,
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/** Watchdog period of 256 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_256CLK = 6,
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/** Watchdog period of 512 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_512CLK = 7,
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/** Watchdog period of 1024 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_1024CLK = 8,
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/** Watchdog period of 2048 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_2048CLK = 9,
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/** Watchdog period of 4096 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_4096CLK = 10,
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/** Watchdog period of 8192 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_8192CLK = 11,
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/** Watchdog period of 16384 clocks of the Watchdog Timer Generic Clock */
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WDT_PERIOD_16384CLK = 12,
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};
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/**
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* \brief Watchdog Timer configuration structure.
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*
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* Configuration structure for a Watchdog Timer instance. This
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* structure should be initialized by the \ref wdt_get_config_defaults()
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* function before being modified by the user application.
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*/
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struct wdt_conf {
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/** If \c true, the Watchdog will be locked to the current configuration
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* settings when the Watchdog is enabled */
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bool always_on;
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/** Enable/Disable the Watchdog Timer */
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bool enable;
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#if !(SAML21) && !(SAML22) && !(SAMC20) && !(SAMC21) && !(SAMR30)
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/** GCLK generator used to clock the peripheral except SAM L21/L22/C21/C20/R30*/
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enum gclk_generator clock_source;
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#endif
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/** Number of Watchdog timer clock ticks until the Watchdog expires */
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enum wdt_period timeout_period;
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/** Number of Watchdog timer clock ticks until the reset window opens */
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enum wdt_period window_period;
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/** Number of Watchdog timer clock ticks until the early warning flag is
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* set */
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enum wdt_period early_warning_period;
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};
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/** \name Configuration and Initialization
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* @{
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*/
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/**
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* \brief Determines if the hardware module(s) are currently synchronizing to the bus.
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*
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* Checks to see if the underlying hardware peripheral module(s) are currently
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* synchronizing across multiple clock domains to the hardware bus. This
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* function can be used to delay further operations on a module until such time
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* that it is ready, to prevent blocking delays for synchronization in the
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* user application.
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*
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* \return Synchronization status of the underlying hardware module(s).
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*
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* \retval false If the module has completed synchronization
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* \retval true If the module synchronization is ongoing
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*/
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static inline bool wdt_is_syncing(void)
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{
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Wdt *const WDT_module = WDT;
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#if (SAML21) || (SAML22) || (SAMC20) || (SAMC21) || (SAMR30)
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if (WDT_module->SYNCBUSY.reg) {
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#else
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if (WDT_module->STATUS.reg & WDT_STATUS_SYNCBUSY) {
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#endif
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return true;
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}
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return false;
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}
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/**
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* \brief Initializes a Watchdog Timer configuration structure to defaults.
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*
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* Initializes a given Watchdog Timer configuration structure to a set of
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* known default values. This function should be called on all new
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* instances of these configuration structures before being modified by the
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* user application.
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*
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* The default configuration is as follows:
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* \li Not locked, to allow for further (re-)configuration
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* \li Enable WDT
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* \li Watchdog timer sourced from Generic Clock Channel 4
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* \li A timeout period of 16384 clocks of the Watchdog module clock
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* \li No window period, so that the Watchdog count can be reset at any time
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* \li No early warning period to indicate the Watchdog will soon expire
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*
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* \param[out] config Configuration structure to initialize to default values
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*/
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static inline void wdt_get_config_defaults(
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struct wdt_conf *const config)
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{
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/* Sanity check arguments */
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Assert(config);
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/* Default configuration values */
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config->always_on = false;
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config->enable = true;
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#if !(SAML21) && !(SAML22) && !(SAMC20) && !(SAMC21) && !(SAMR30)
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config->clock_source = GCLK_GENERATOR_4;
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#endif
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config->timeout_period = WDT_PERIOD_16384CLK;
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config->window_period = WDT_PERIOD_NONE;
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config->early_warning_period = WDT_PERIOD_NONE;
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}
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enum status_code wdt_set_config(
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const struct wdt_conf *const config);
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/** \brief Determines if the Watchdog timer is currently locked in an enabled state.
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*
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|
|
* Determines if the Watchdog timer is currently enabled and locked, so that
|
||
|
|
* it cannot be disabled or otherwise reconfigured.
|
||
|
|
*
|
||
|
|
* \return Current Watchdog lock state.
|
||
|
|
*/
|
||
|
|
static inline bool wdt_is_locked(void)
|
||
|
|
{
|
||
|
|
Wdt *const WDT_module = WDT;
|
||
|
|
|
||
|
|
#if (SAML21) || (SAML22) || (SAMC20) || (SAMC21) || (SAMR30)
|
||
|
|
return (WDT_module->CTRLA.reg & WDT_CTRLA_ALWAYSON);
|
||
|
|
#else
|
||
|
|
return (WDT_module->CTRL.reg & WDT_CTRL_ALWAYSON);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/** @} */
|
||
|
|
|
||
|
|
/** \name Timeout and Early Warning Management
|
||
|
|
* @{
|
||
|
|
*/
|
||
|
|
|
||
|
|
/** \brief Clears the Watchdog timer early warning period elapsed flag.
|
||
|
|
*
|
||
|
|
* Clears the Watchdog timer early warning period elapsed flag, so that a new
|
||
|
|
* early warning period can be detected.
|
||
|
|
*/
|
||
|
|
static inline void wdt_clear_early_warning(void)
|
||
|
|
{
|
||
|
|
Wdt *const WDT_module = WDT;
|
||
|
|
|
||
|
|
WDT_module->INTFLAG.reg = WDT_INTFLAG_EW;
|
||
|
|
}
|
||
|
|
|
||
|
|
/** \brief Determines if the Watchdog timer early warning period has elapsed.
|
||
|
|
*
|
||
|
|
* Determines if the Watchdog timer early warning period has elapsed.
|
||
|
|
*
|
||
|
|
* \note If no early warning period was configured, the value returned by this
|
||
|
|
* function is invalid.
|
||
|
|
*
|
||
|
|
* \return Current Watchdog Early Warning state.
|
||
|
|
*/
|
||
|
|
static inline bool wdt_is_early_warning(void)
|
||
|
|
{
|
||
|
|
Wdt *const WDT_module = WDT;
|
||
|
|
|
||
|
|
return (WDT_module->INTFLAG.reg & WDT_INTFLAG_EW);
|
||
|
|
}
|
||
|
|
|
||
|
|
void wdt_reset_count(void);
|
||
|
|
|
||
|
|
/** @} */
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/** @} */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \page asfdoc_sam0_wdt_extra Extra Information for WDT Driver
|
||
|
|
*
|
||
|
|
* \section asfdoc_sam0_wdt_extra_acronyms Acronyms
|
||
|
|
* The table below presents the acronyms used in this module:
|
||
|
|
*
|
||
|
|
* <table>
|
||
|
|
* <tr>
|
||
|
|
* <th>Acronym</th>
|
||
|
|
* <th>Description</th>
|
||
|
|
* </tr>
|
||
|
|
* <tr>
|
||
|
|
* <td>WDT</td>
|
||
|
|
* <td>Watchdog Timer</td>
|
||
|
|
* </tr>
|
||
|
|
* </table>
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* \section asfdoc_sam0_wdt_extra_dependencies Dependencies
|
||
|
|
* This driver has the following dependencies:
|
||
|
|
*
|
||
|
|
* - \ref asfdoc_sam0_system_clock_group "System Clock Driver"
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* \section asfdoc_sam0_wdt_extra_errata Errata
|
||
|
|
* There are no errata related to this driver.
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* \section asfdoc_sam0_wdt_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>Driver updated to follow driver type convention:
|
||
|
|
* \li wdt_init, wdt_enable, wdt_disable functions removed
|
||
|
|
* \li wdt_set_config function added
|
||
|
|
* \li WDT module enable state moved inside the configuration struct </td>
|
||
|
|
* </tr>
|
||
|
|
* <tr>
|
||
|
|
* <td>Initial Release</td>
|
||
|
|
* </tr>
|
||
|
|
* </table>
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \page asfdoc_sam0_wdt_exqsg Examples for WDT Driver
|
||
|
|
*
|
||
|
|
* This is a list of the available Quick Start guides (QSGs) and example
|
||
|
|
* applications for \ref asfdoc_sam0_wdt_group. QSGs are simple examples with
|
||
|
|
* step-by-step instructions to configure and use this driver in a selection of
|
||
|
|
* use cases. Note that a QSG can be compiled as a standalone application or be
|
||
|
|
* added to the user application.
|
||
|
|
*
|
||
|
|
* - \subpage asfdoc_sam0_wdt_basic_use_case
|
||
|
|
* \if WDT_CALLBACK_MODE
|
||
|
|
* - \subpage asfdoc_sam0_wdt_callback_use_case
|
||
|
|
* \endif
|
||
|
|
*
|
||
|
|
* \page asfdoc_sam0_wdt_document_revision_history Document Revision History
|
||
|
|
*
|
||
|
|
* <table>
|
||
|
|
* <tr>
|
||
|
|
* <th>Doc. Rev.</th>
|
||
|
|
* <th>Date</th>
|
||
|
|
* <th>Comments</th>
|
||
|
|
* </tr>
|
||
|
|
* <tr>
|
||
|
|
* <td>42124E</td>
|
||
|
|
* <td>12/2015</td>
|
||
|
|
* <td>Added support for SAM L21/L22, SAM DA1, SAM D09, SAM R30, and SAM C20/C21</td>
|
||
|
|
* </tr>
|
||
|
|
* <tr>
|
||
|
|
* <td>42124D</td>
|
||
|
|
* <td>12/2014</td>
|
||
|
|
* <td>Added SAM R21 and SAM D10/D11 support</td>
|
||
|
|
* </tr>
|
||
|
|
* <tr>
|
||
|
|
* <td>42124C</td>
|
||
|
|
* <td>01/2014</td>
|
||
|
|
* <td>Add SAM D21 support</td>
|
||
|
|
* </tr>
|
||
|
|
* <tr>
|
||
|
|
* <td>42124B</td>
|
||
|
|
* <td>06/2013</td>
|
||
|
|
* <td>Corrected documentation typos</td>
|
||
|
|
* </tr>
|
||
|
|
* <tr>
|
||
|
|
* <td>42124A</td>
|
||
|
|
* <td>06/2013</td>
|
||
|
|
* <td>Initial release</td>
|
||
|
|
* </tr>
|
||
|
|
* </table>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#endif /* WDT_H_INCLUDED */
|