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69 lines
2.9 KiB
C
69 lines
2.9 KiB
C
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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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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//
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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,
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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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#ifndef __ESP_EXPRESSION_WITH_STACK_H
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#define __ESP_EXPRESSION_WITH_STACK_H
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#include "freertos/FreeRTOS.h"
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#include "freertos/semphr.h"
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#include "esp_debug_helpers.h"
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/**
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* @brief Executes a 1-line expression with a application alocated stack
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* @param lock Mutex object to protect in case of shared stack
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* @param stack Pointer to user alocated stack
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* @param stack_size Size of current stack in bytes
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* @param expression Expression or function to be executed using the stack
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*/
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#define ESP_EXECUTE_EXPRESSION_WITH_STACK(lock, stack, stack_size, expression) \
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({ \
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if(lock && stack && stack_size) { \
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uint32_t backup; \
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xSemaphoreTake(lock, portMAX_DELAY); \
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StackType_t *top_of_stack = esp_switch_stack_setup(stack, stack_size);\
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esp_switch_stack_enter(top_of_stack, &backup); \
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{ \
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expression; \
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} \
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esp_switch_stack_exit(&backup); \
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xSemaphoreGive(lock); \
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} \
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})
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/**
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* @brief Fill stack frame with CPU-specifics value before use
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* @param stack Caller allocated stack pointer
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* @param stack_size Size of stack in bytes
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* @return New pointer to the top of stack
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* @note Application must not call this function directly
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*/
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StackType_t * esp_switch_stack_setup(StackType_t *stack, size_t stack_size);
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/**
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* @brief Changes CPU sp-register to use another stack space and save the previous one
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* @param stack Caller allocated stack pointer
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* @param backup_stack Pointer to a place to save the current stack
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* @note Application must not call this function directly
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*/
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extern void esp_switch_stack_enter(StackType_t *stack, uint32_t *backup_stack);
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/**
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* @brief Restores the previous CPU sp-register
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* @param backup_stack Pointer to the place where stack was saved
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* @note Application must not call this function directly
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*/
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extern void esp_switch_stack_exit(uint32_t *backup_stack);
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#endif |