forked from nuttx/nuttx-update
340 lines
12 KiB
C
340 lines
12 KiB
C
/****************************************************************************
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* include/nuttx/wdog.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_WDOG_H
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#define __INCLUDE_NUTTX_WDOG_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <nuttx/clock.h>
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#include <stdint.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define WDOG_ISACTIVE(w) ((w)->func != NULL)
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/****************************************************************************
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* Public Type Declarations
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****************************************************************************/
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/* The arguments are passed as scalar wdparm_t values. For systems where
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* the sizeof(pointer) < sizeof(uint32_t), the following union defines the
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* alignment of the pointer within the uint32_t. For example, the SDCC
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* MCS51 general pointer is 24-bits, but uint32_t is 32-bits (of course).
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*
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* We always have sizeof(pointer) <= sizeof(uintptr_t) by definition.
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*/
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#if UINTPTR_MAX >= UINT32_MAX
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typedef uintptr_t wdparm_t;
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#else
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typedef uint32_t wdparm_t;
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#endif
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/* This is the form of the function that is called when the
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* watchdog function expires.
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*/
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typedef CODE void (*wdentry_t)(wdparm_t arg);
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/* Avoid the inclusion of nuttx/list.h */
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struct wdlist_node
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{
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FAR struct wdlist_node *prev;
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FAR struct wdlist_node *next;
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};
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/* This is the internal representation of the watchdog timer structure.
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* Notice !!!
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* Carefully with the struct wdog_s order, you may not directly modify
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* this. This struct will combine in struct work_s in union type, and,
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* wqueue will modify/check this struct in kwork work_qcancel().
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*/
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struct wdog_s
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{
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struct wdlist_node node; /* Supports a doubly linked list */
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wdparm_t arg; /* Callback argument */
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wdentry_t func; /* Function to execute when delay expires */
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#ifdef CONFIG_PIC
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FAR void *picbase; /* PIC base address */
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#endif
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clock_t expired; /* Timer associated with the absoulute time */
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};
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/****************************************************************************
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* Pubic Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: wd_start
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*
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* Description:
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* This function adds a watchdog timer to the active timer queue. The
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* specified watchdog function at 'wdentry' will be called from the
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* interrupt level after the specified number of ticks has elapsed.
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* Watchdog timers may be started from the interrupt level.
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*
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* Watchdog timers execute in the address environment that was in effect
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* when wd_start() is called.
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*
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* Watchdog timers execute only once.
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*
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* To replace either the timeout delay or the function to be executed,
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* call wd_start again with the same wdog; only the most recent wdStart()
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* on a given watchdog ID has any effect.
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*
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* Input Parameters:
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* wdog - Watchdog ID
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* delay - Delay count in clock ticks
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* wdentry - Function to call on timeout
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* arg - Parameter to pass to wdentry.
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*
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* NOTE: The parameter must be of type wdparm_t.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is return to
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* indicate the nature of any failure.
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*
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* Assumptions:
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* The watchdog routine runs in the context of the timer interrupt handler
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* and is subject to all ISR restrictions.
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*
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****************************************************************************/
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int wd_start(FAR struct wdog_s *wdog, sclock_t delay,
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wdentry_t wdentry, wdparm_t arg);
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/****************************************************************************
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* Name: wd_start_abstick
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*
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* Description:
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* This function adds a watchdog timer to the active timer queue. The
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* specified watchdog function at 'wdentry' will be called from the
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* interrupt level after the specified number of ticks has reached.
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* Watchdog timers may be started from the interrupt level.
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*
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* Watchdog timers execute in the address environment that was in effect
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* when wd_start() is called.
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*
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* Watchdog timers execute only once.
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*
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* To replace either the timeout delay or the function to be executed,
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* call wd_start again with the same wdog; only the most recent wdStart()
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* on a given watchdog ID has any effect.
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*
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* Input Parameters:
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* wdog - Watchdog ID
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* ticks - Absoulute time in clock ticks
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* wdentry - Function to call on timeout
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* arg - Parameter to pass to wdentry.
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*
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* NOTE: The parameter must be of type wdparm_t.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is return to
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* indicate the nature of any failure.
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*
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* Assumptions:
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* The watchdog routine runs in the context of the timer interrupt handler
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* and is subject to all ISR restrictions.
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*
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****************************************************************************/
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int wd_start_abstick(FAR struct wdog_s *wdog, clock_t ticks,
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wdentry_t wdentry, wdparm_t arg);
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/****************************************************************************
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* Name: wd_start_abstime
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*
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* Description:
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* This function adds a watchdog timer to the active timer queue. The
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* specified watchdog function at 'wdentry' will be called from the
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* interrupt level after the specified number of ticks has reached.
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* Watchdog timers may be started from the interrupt level.
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*
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* Watchdog timers execute in the address environment that was in effect
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* when wd_start() is called.
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*
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* Watchdog timers execute only once.
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*
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* To replace either the timeout delay or the function to be executed,
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* call wd_start again with the same wdog; only the most recent wdStart()
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* on a given watchdog ID has any effect.
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*
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* Input Parameters:
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* wdog - Watchdog ID
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* abstime - Absolute time with struct timespec
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* wdentry - Function to call on timeout
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* arg - Parameter to pass to wdentry.
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*
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* NOTE: The parameter must be of type wdparm_t.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is return to
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* indicate the nature of any failure.
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*
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* Assumptions:
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* The watchdog routine runs in the context of the timer interrupt handler
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* and is subject to all ISR restrictions.
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*
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****************************************************************************/
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#define wd_start_abstime(wdog, abstime, wdentry, arg) \
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wd_start_abstick(wdog, clock_time2ticks(abstime), wdentry, arg)
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/****************************************************************************
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* Name: wd_start_realtime
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*
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* Description:
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* This function adds a watchdog timer to the active timer queue. The
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* specified watchdog function at 'wdentry' will be called from the
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* interrupt level after the specified number of ticks has reached.
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* Watchdog timers may be started from the interrupt level.
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*
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* Watchdog timers execute in the address environment that was in effect
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* when wd_start() is called.
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*
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* Watchdog timers execute only once.
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*
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* To replace either the timeout delay or the function to be executed,
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* call wd_start again with the same wdog; only the most recent wdStart()
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* on a given watchdog ID has any effect.
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*
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* Input Parameters:
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* wdog - Watchdog ID
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* realtime - Realtime with struct timespec
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* wdentry - Function to call on timeout
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* arg - Parameter to pass to wdentry.
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*
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* NOTE: The parameter must be of type wdparm_t.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is return to
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* indicate the nature of any failure.
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*
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* Assumptions:
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* The watchdog routine runs in the context of the timer interrupt handler
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* and is subject to all ISR restrictions.
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*
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****************************************************************************/
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static inline int wd_start_realtime(FAR struct wdog_s *wdog,
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FAR const struct timespec *realtime,
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wdentry_t wdentry,
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wdparm_t arg)
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{
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#ifdef CONFIG_CLOCK_TIMEKEEPING
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irqstate_t flags;
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clock_t ticks;
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int ret;
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flags = enter_critical_section();
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clock_abstime2ticks(CLOCK_REALTIME, realtime, &ticks);
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ret = wd_start(wdog, ticks, wdentry, arg);
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leave_critical_section(flags);
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return ret;
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#else
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clock_t absticks;
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clock_realtime2absticks(realtime, &absticks);
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return wd_start_abstick(wdog, absticks, wdentry, arg);
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#endif
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}
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/****************************************************************************
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* Name: wd_cancel
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*
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* Description:
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* This function cancels a currently running watchdog timer. Watchdog
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* timers may be cancelled from the interrupt level.
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*
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* Input Parameters:
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* wdog - ID of the watchdog to cancel.
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*
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* Returned Value:
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* Zero (OK) is returned on success; A negated errno value is returned to
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* indicate the nature of any failure.
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*
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****************************************************************************/
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int wd_cancel(FAR struct wdog_s *wdog);
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/****************************************************************************
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* Name: wd_cancel_irq
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*
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* Description:
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* This function cancels a currently running watchdog timer. Watchdog
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* timers may be cancelled from the interrupt level. This function is
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* intended to be called from critical sections.
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*
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* Input Parameters:
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* wdog - ID of the watchdog to cancel.
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*
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* Returned Value:
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* Zero (OK) is returned on success; A negated errno value is returned to
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* indicate the nature of any failure.
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*
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****************************************************************************/
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int wd_cancel_irq(FAR struct wdog_s *wdog);
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/****************************************************************************
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* Name: wd_gettime
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*
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* Description:
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* This function returns the time remaining before the specified watchdog
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* timer expires.
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*
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* Input Parameters:
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* wdog - watchdog ID
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*
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* Returned Value:
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* The time in system ticks remaining until the watchdog time expires.
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* Zero means either that wdog is not valid or that the wdog has already
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* expired.
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*
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****************************************************************************/
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sclock_t wd_gettime(FAR struct wdog_s *wdog);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_WDOG_H */
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