286 lines
9.8 KiB
C
286 lines
9.8 KiB
C
/****************************************************************************
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* include/nuttx/wdog.h
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*
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* Copyright (C) 2007-2009, 2014-2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* 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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****************************************************************************/
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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 <stdint.h>
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#include <queue.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ********************************************************/
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#ifndef CONFIG_PREALLOC_WDOGS
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# define CONFIG_PREALLOC_WDOGS 32
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#endif
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#ifndef CONFIG_WDOG_INTRESERVE
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# if CONFIG_PREALLOC_WDOGS > 16
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# define CONFIG_WDOG_INTRESERVE 4
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# elif CONFIG_PREALLOC_WDOGS > 8
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# define CONFIG_WDOG_INTRESERVE 2
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# else
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# define CONFIG_WDOG_INTRESERVE 1
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# endif
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#endif
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#if CONFIG_WDOG_INTRESERVE >= CONFIG_PREALLOC_WDOGS
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# error CONFIG_WDOG_INTRESERVE >= CONFIG_PREALLOC_WDOGS
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#endif
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/* Watchdog Definitions *************************************************/
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/* Flag bits for the flags field of struct wdog_s */
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#define WDOGF_ACTIVE (1 << 0) /* Bit 0: 1=Watchdog is actively timing */
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#define WDOGF_ALLOCED (1 << 1) /* Bit 1: 0=Pre-allocated, 1=Allocated */
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#define WDOGF_STATIC (1 << 2) /* Bit 2: 0=[Pre-]allocated, 1=Static */
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#define WDOG_SETACTIVE(w) do { (w)->flags |= WDOGF_ACTIVE; } while (0)
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#define WDOG_SETALLOCED(w) do { (w)->flags |= WDOGF_ALLOCED; } while (0)
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#define WDOG_SETSTATIC(w) do { (w)->flags |= WDOGF_STATIC; } while (0)
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#define WDOG_CLRACTIVE(w) do { (w)->flags &= ~WDOGF_ACTIVE; } while (0)
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#define WDOG_CLRALLOCED(w) do { (w)->flags &= ~WDOGF_ALLOCED; } while (0)
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#define WDOG_CLRSTATIC(w) do { (w)->flags &= ~WDOGF_STATIC; } while (0)
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#define WDOG_ISACTIVE(w) (((w)->flags & WDOGF_ACTIVE) != 0)
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#define WDOG_ISALLOCED(w) (((w)->flags & WDOGF_ALLOCED) != 0)
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#define WDOG_ISSTATIC(w) (((w)->flags & WDOGF_STATIC) != 0)
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/* Initialization of statically allocated timers ****************************/
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#define wd_static(w) \
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do { (w)->next = NULL; (w)->flags = WDOGF_STATIC; } while (0)
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#ifdef CONFIG_PIC
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# define WDOG_INITIAILIZER { NULL, NULL, NULL, 0, WDOGF_STATIC, 0 }
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#else
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# define WDOG_INITIAILIZER { NULL, NULL, 0, WDOGF_STATIC, 0 }
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#endif
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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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union wdparm_u
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{
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FAR void *pvarg; /* The size one generic point */
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uint32_t dwarg; /* Big enough for a 32-bit value in any case */
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uintptr_t uiarg; /* sizeof(uintptr_t) >= sizeof(pointer) */
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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. Up to four parameters may be passed.
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*/
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typedef CODE void (*wdentry_t)(int argc, wdparm_t arg1, ...);
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/* This is the internal representation of the watchdog timer structure. The
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* WDOG_ID is a pointer to a watchdog structure.
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*/
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struct wdog_s
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{
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FAR struct wdog_s *next; /* Support for singly linked lists. */
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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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int lag; /* Timer associated with the delay */
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uint8_t flags; /* See WDOGF_* definitions above */
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uint8_t argc; /* The number of parameters to pass */
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wdparm_t parm[CONFIG_MAX_WDOGPARMS];
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};
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/* Watchdog 'handle' */
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typedef FAR struct wdog_s *WDOG_ID;
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/****************************************************************************
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* Public Data
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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_create
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*
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* Description:
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* The wd_create function will create a watchdog timer by allocating one
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* from the list of free watchdog timers.
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*
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* Parameters:
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* None
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*
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* Return Value:
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* Pointer to watchdog (i.e., the watchdog ID), or NULL if insufficient
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* watchdogs are available.
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*
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****************************************************************************/
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WDOG_ID wd_create(void);
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/****************************************************************************
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* Name: wd_delete
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*
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* Description:
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* The wd_delete() function will deallocate a watchdog timer by returning
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* it to the free pool of watchdog timers. The watchdog timer will be
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* removed from the active timer queue if had been started.
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*
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* Parameters:
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* wdog - The watchdog ID to delete. This is actually a pointer to a
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* watchdog structure.
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*
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* Return Value:
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* Returns OK or ERROR
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*
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* Assumptions:
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* The caller has assured that the watchdog is no longer in use.
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*
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****************************************************************************/
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int wd_delete(WDOG_ID wdog);
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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 actuve 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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* 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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* parm1..4 - parameters to pass to wdentry
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*
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* Return Value:
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* OK or ERROR
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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(WDOG_ID wdog, int32_t delay, wdentry_t wdentry, int argc, ...);
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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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* Parameters:
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* wdog - ID of the watchdog to cancel.
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*
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* Return 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(WDOG_ID 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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* Parameters:
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* wdog - watchdog ID
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*
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* Return 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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int wd_gettime(WDOG_ID 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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