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412 lines
12 KiB
C
412 lines
12 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2018 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.c
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* @brief OSAL module code.
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*
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* @addtogroup OSAL
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* @{
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*/
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#include "osal.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 Pointer to a halt error message.
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* @note The message is meant to be retrieved by the debugger after the
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* system halt caused by an unexpected error.
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*/
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const char *osal_halt_msg;
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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 OSAL module initialization.
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*
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* @api
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*/
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void osalInit(void) {
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}
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/**
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* @brief System halt with error message.
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*
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* @param[in] reason the halt message pointer
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*
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* @api
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*/
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#if !defined(__DOXYGEN__)
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__attribute__((weak, noreturn))
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#endif
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void osalSysHalt(const char *reason) {
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osalSysDisable();
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osal_halt_msg = reason;
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while (true) {
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}
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}
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/**
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* @brief Polled delay.
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* @note The real delay is always few cycles in excess of the specified
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* value.
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*
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* @param[in] cycles number of cycles
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*
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* @xclass
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*/
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void osalSysPolledDelayX(rtcnt_t cycles) {
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(void)cycles;
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}
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/**
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* @brief System timer handler.
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* @details The handler is used for scheduling and Virtual Timers management.
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*
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* @iclass
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*/
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void osalOsTimerHandlerI(void) {
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osalDbgCheckClassI();
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}
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/**
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* @brief Checks if a reschedule is required and performs it.
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* @note I-Class functions invoked from thread context must not reschedule
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* by themselves, an explicit reschedule using this function is
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* required in this scenario.
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* @note Not implemented in this simplified OSAL.
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*
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* @sclass
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*/
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void osalOsRescheduleS(void) {
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}
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/**
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* @brief Current system time.
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* @details Returns the number of system ticks since the @p osalInit()
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* invocation.
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* @note The counter can reach its maximum and then restart from zero.
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* @note This function can be called from any context but its atomicity
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* is not guaranteed on architectures whose word size is less than
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* @p systime_t size.
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*
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* @return The system time in ticks.
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*
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* @xclass
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*/
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systime_t osalOsGetSystemTimeX(void) {
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return (systime_t)0;
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}
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/**
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* @brief Suspends the invoking thread for the specified time.
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*
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* @param[in] time the delay in system ticks, the special values are
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* 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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*
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* @sclass
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*/
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void osalThreadSleepS(sysinterval_t time) {
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(void)time;
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}
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/**
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* @brief Suspends the invoking thread for the specified time.
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*
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* @param[in] time the delay in system ticks, the special values are
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* 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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*
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* @api
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*/
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void osalThreadSleep(sysinterval_t time) {
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(void)time;
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}
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/**
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* @brief Sends the current thread sleeping and sets a reference variable.
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* @note This function must reschedule, it can only be called from thread
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* context.
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*
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* @param[in] trp a pointer to a thread reference object
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* @return The wake up message.
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*
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* @sclass
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*/
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msg_t osalThreadSuspendS(thread_reference_t *trp) {
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osalDbgCheck(trp != NULL);
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return MSG_OK;
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}
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/**
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* @brief Sends the current thread sleeping and sets a reference variable.
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* @note This function must reschedule, it can only be called from thread
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* context.
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*
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* @param[in] trp a pointer to a thread reference object
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* @param[in] timeout the timeout in system ticks, the special values are
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* handled as follow:
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* - @a TIME_INFINITE the thread enters an infinite sleep
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* state.
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* - @a TIME_IMMEDIATE the thread is not enqueued and
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* the function returns @p MSG_TIMEOUT as if a timeout
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* occurred.
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* .
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* @return The wake up message.
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* @retval MSG_TIMEOUT if the operation timed out.
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*
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* @sclass
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*/
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msg_t osalThreadSuspendTimeoutS(thread_reference_t *trp, sysinterval_t timeout) {
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osalDbgCheck(trp != NULL);
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(void)timeout;
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return MSG_OK;
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}
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/**
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* @brief Wakes up a thread waiting on a thread reference object.
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* @note This function must not reschedule because it can be called from
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* ISR context.
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*
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* @param[in] trp a pointer to a thread reference object
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* @param[in] msg the message code
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*
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* @iclass
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*/
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void osalThreadResumeI(thread_reference_t *trp, msg_t msg) {
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osalDbgCheck(trp != NULL);
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(void)msg;
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}
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/**
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* @brief Wakes up a thread waiting on a thread reference object.
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* @note This function must reschedule, it can only be called from thread
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* context.
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*
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* @param[in] trp a pointer to a thread reference object
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* @param[in] msg the message code
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*
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* @iclass
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*/
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void osalThreadResumeS(thread_reference_t *trp, msg_t msg) {
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osalDbgCheck(trp != NULL);
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(void)msg;
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}
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/**
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* @brief Enqueues the caller thread.
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* @details The caller thread is enqueued and put to sleep until it is
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* dequeued or the specified timeouts expires.
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*
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* @param[in] tqp pointer to the threads queue object
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* @param[in] timeout the timeout in system ticks, the special values are
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* handled as follow:
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* - @a TIME_INFINITE the thread enters an infinite sleep
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* state.
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* - @a TIME_IMMEDIATE the thread is not enqueued and
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* the function returns @p MSG_TIMEOUT as if a timeout
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* occurred.
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* .
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* @return The message from @p osalQueueWakeupOneI() or
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* @p osalQueueWakeupAllI() functions.
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* @retval MSG_TIMEOUT if the thread has not been dequeued within the
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* specified timeout or if the function has been
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* invoked with @p TIME_IMMEDIATE as timeout
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* specification.
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*
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* @sclass
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*/
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msg_t osalThreadEnqueueTimeoutS(threads_queue_t *tqp, sysinterval_t timeout) {
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osalDbgCheck(tqp != NULL);
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(void)timeout;
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return MSG_OK;
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}
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/**
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* @brief Dequeues and wakes up one thread from the queue, if any.
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*
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* @param[in] tqp pointer to the threads queue object
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* @param[in] msg the message code
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*
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* @iclass
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*/
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void osalThreadDequeueNextI(threads_queue_t *tqp, msg_t msg) {
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osalDbgCheck(tqp != NULL);
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(void)msg;
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}
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/**
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* @brief Dequeues and wakes up all threads from the queue.
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*
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* @param[in] tqp pointer to the threads queue object
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* @param[in] msg the message code
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*
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* @iclass
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*/
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void osalThreadDequeueAllI(threads_queue_t *tqp, msg_t msg) {
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(void)tqp;
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(void)msg;
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}
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/**
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* @brief Add flags to an event source object.
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*
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* @param[in] esp pointer to the event flags object
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* @param[in] flags flags to be ORed to the flags mask
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*
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* @iclass
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*/
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void osalEventBroadcastFlagsI(event_source_t *esp, eventflags_t flags) {
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osalDbgCheck(esp != NULL);
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esp->flags |= flags;
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if (esp->cb != NULL) {
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esp->cb(esp);
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}
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}
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/**
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* @brief Add flags to an event source object.
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*
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* @param[in] esp pointer to the event flags object
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* @param[in] flags flags to be ORed to the flags mask
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*
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* @iclass
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*/
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void osalEventBroadcastFlags(event_source_t *esp, eventflags_t flags) {
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osalDbgCheck(esp != NULL);
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osalSysLock();
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osalEventBroadcastFlagsI(esp, flags);
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osalSysUnlock();
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}
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/**
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* @brief Event callback setup.
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* @note The callback is invoked from ISR context and can
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* only invoke I-Class functions. The callback is meant
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* to wakeup the task that will handle the event by
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* calling @p osalEventGetAndClearFlagsI().
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* @note This function is not part of the OSAL API and is provided
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* exclusively as an example and for convenience.
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*
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* @param[in] esp pointer to the event flags object
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* @param[in] cb pointer to the callback function
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* @param[in] param parameter to be passed to the callback function
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*
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* @api
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*/
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void osalEventSetCallback(event_source_t *esp,
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eventcallback_t cb,
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void *param) {
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osalDbgCheck(esp != NULL);
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esp->cb = cb;
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esp->param = param;
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}
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/**
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* @brief Locks the specified mutex.
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* @post The mutex is locked and inserted in the per-thread stack of owned
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* mutexes.
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*
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* @param[in,out] mp pointer to the @p mutex_t object
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*
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* @api
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*/
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void osalMutexLock(mutex_t *mp) {
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osalDbgCheck(mp != NULL);
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*mp = 1;
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}
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/**
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* @brief Unlocks the specified mutex.
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* @note The HAL guarantees to release mutex in reverse lock order. The
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* mutex being unlocked is guaranteed to be the last locked mutex
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* by the invoking thread.
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* The implementation can rely on this behavior and eventually
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* ignore the @p mp parameter which is supplied in order to support
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* those OSes not supporting a stack of the owned mutexes.
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*
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* @param[in,out] mp pointer to the @p mutex_t object
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*
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* @api
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*/
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void osalMutexUnlock(mutex_t *mp) {
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osalDbgCheck(mp != NULL);
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*mp = 0;
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}
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/** @} */
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