169 lines
5.4 KiB
C
Executable File
169 lines
5.4 KiB
C
Executable File
/*
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ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file osal_vt.c
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* @brief OSAL Virtual Timers module code.
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* @details This module can be used in an OSAL implementation whenever an
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* underlying RTOS is unable to provide timeout services or there
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* is no underlying RTOS.
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*
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* @addtogroup OSAL_VT
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* @{
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*/
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#include "osal.h"
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#include "osal_vt.h"
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/*===========================================================================*/
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/* Module local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module exported variables. */
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/*===========================================================================*/
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/**
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* @brief Virtual timers delta list header.
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*/
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virtual_timers_list_t vtlist;
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/*===========================================================================*/
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/* Module local types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module exported functions. */
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/*===========================================================================*/
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/**
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* @brief Timers initialization.
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*
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* @init
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*/
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void vtInit(void) {
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/* Virtual Timers initialization.*/
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vtlist.vt_next = vtlist.vt_prev = (void *)&vtlist;
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vtlist.vt_time = (systime_t)-1;
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vtlist.vt_systime = 0;
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}
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/**
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* @brief Returns @p TRUE if the specified timer is armed.
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*
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* @param[out] vtp the @p virtual_timer_t structure pointer
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*
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* @iclass
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*/
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bool vtIsArmedI(virtual_timer_t *vtp) {
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return vtp->vt_func != NULL;
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}
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/**
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* @brief Virtual timers ticker.
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* @note The system lock is released before entering the callback and
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* re-acquired immediately after. It is callback's responsibility
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* to acquire the lock if needed. This is done in order to reduce
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* interrupts jitter when many timers are in use.
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*
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* @iclass
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*/
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void vtDoTickI(void) {
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vtlist.vt_systime++;
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if (&vtlist != (virtual_timers_list_t *)vtlist.vt_next) {
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virtual_timer_t *vtp;
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--vtlist.vt_next->vt_time;
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while (!(vtp = vtlist.vt_next)->vt_time) {
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vtfunc_t fn = vtp->vt_func;
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vtp->vt_func = (vtfunc_t)NULL;
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vtp->vt_next->vt_prev = (void *)&vtlist;
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(&vtlist)->vt_next = vtp->vt_next;
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osalSysUnlockFromISR();
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fn(vtp->vt_par);
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osalSysLockFromISR();
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}
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}
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}
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/**
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* @brief Enables a virtual timer.
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* @note The associated function is invoked from interrupt context.
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*
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* @param[out] vtp the @p virtual_timer_t structure pointer
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* @param[in] time the number of ticks before the operation timeouts, the
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* special values are handled as follow:
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* - @a TIME_INFINITE is allowed but interpreted as a
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* normal time specification.
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* - @a TIME_IMMEDIATE this value is not allowed.
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* .
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* @param[in] vtfunc the timer callback function. After invoking the
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* callback the timer is disabled and the structure can
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* be disposed or reused.
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* @param[in] par a parameter that will be passed to the callback
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* function
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*
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* @iclass
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*/
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void vtSetI(virtual_timer_t *vtp, systime_t time,
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vtfunc_t vtfunc, void *par) {
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virtual_timer_t *p;
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vtp->vt_par = par;
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vtp->vt_func = vtfunc;
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p = vtlist.vt_next;
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while (p->vt_time < time) {
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time -= p->vt_time;
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p = p->vt_next;
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}
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vtp->vt_prev = (vtp->vt_next = p)->vt_prev;
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vtp->vt_prev->vt_next = p->vt_prev = vtp;
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vtp->vt_time = time;
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if (p != (void *)&vtlist)
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p->vt_time -= time;
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}
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/**
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* @brief Disables a Virtual Timer.
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* @note The timer MUST be active when this function is invoked.
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*
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* @param[in] vtp the @p virtual_timer_t structure pointer
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*
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* @iclass
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*/
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void vtResetI(virtual_timer_t *vtp) {
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if (vtp->vt_next != (void *)&vtlist)
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vtp->vt_next->vt_time += vtp->vt_time;
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vtp->vt_prev->vt_next = vtp->vt_next;
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vtp->vt_next->vt_prev = vtp->vt_prev;
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vtp->vt_func = (vtfunc_t)NULL;
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}
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/** @} */
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