FreeRTOS
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Outline
#include "FreeRTOS.h"
#include "semphr.h"
xt_overlay_mutex
xt_overlay_init_os()
xt_overlay_lock()
xt_overlay_unlock()
Files
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SourceVuESP-IDF Framework and ExamplesFreeRTOSFreeRTOS-Kernel/portable/xtensa/xtensa_overlay_os_hook.c
 
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/* * SPDX-FileCopyrightText: 2015-2019 Cadence Design Systems, Inc. * * SPDX-License-Identifier: MIT * * SPDX-FileContributor: 2016-2022 Espressif Systems (Shanghai) CO LTD *//* ... */ /* * Copyright (c) 2015-2019 Cadence Design Systems, Inc. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *//* ... */ /* * xtensa_overlay_os_hook.c -- Overlay manager OS hooks for FreeRTOS. *//* ... */ #include "FreeRTOS.h" #include "semphr.h" #if configUSE_MUTEXES /* Mutex object that controls access to the overlay. Currently only one * overlay region is supported so one mutex suffices. *//* ... */ static SemaphoreHandle_t xt_overlay_mutex; /* This function should be overridden to provide OS specific init such * as the creation of a mutex lock that can be used for overlay locking. * Typically this mutex would be set up with priority inheritance. See * overlay manager documentation for more details. *//* ... */ void xt_overlay_init_os(void) { /* Create the mutex for overlay access. Priority inheritance is * required. *//* ... */ xt_overlay_mutex = xSemaphoreCreateMutex(); }{ ... } /* This function locks access to shared overlay resources, typically * by acquiring a mutex. *//* ... */ void xt_overlay_lock(void) { xSemaphoreTake(xt_overlay_mutex, 0); }{ ... } /* This function releases access to shared overlay resources, typically * by unlocking a mutex. *//* ... */ void xt_overlay_unlock(void) { xSemaphoreGive(xt_overlay_mutex); }{ ... } /* ... */#endif
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