esp-idf/components/esp_psram/include/esp_private/esp_psram_extram.h

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/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include <stddef.h>
#include <stdbool.h>
#include "esp_err.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Check if the pointer is on PSRAM
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*
* @param[in] p The pointer to check
*
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* @return
* - False: the pointer isn't on PSRAM, or PSRAM isn't initialised successfully
* - True: the pointer is on PSRAM
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*/
bool esp_psram_check_ptr_addr(const void *p);
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/**
* @brief Add the initialized PSRAM to the heap allocator.
*
* @return
* - ESP_OK: On success
* Other error type, see `heap_caps_add_region`.
*/
esp_err_t esp_psram_extram_add_to_heap_allocator(void);
/**
* @brief Reserve a pool of internal memory for specific DMA/internal allocations
*
* @param size Size of reserved pool in bytes
*
* @return
* - ESP_OK: On success
* - ESP_ERR_NO_MEM: When no memory available for pool
*/
esp_err_t esp_psram_extram_reserve_dma_pool(size_t size);
/**
* @brief Memory test for PSRAM. Should be called after PSRAM is initialized and
* (in case of a dual-core system) the app CPU is online. This test overwrites the
* memory with crap, so do not call after e.g. the heap allocator has stored important
* stuff in PSRAM.
*
* @return true on success, false on failed memory test
*/
bool esp_psram_extram_test(void);
#if CONFIG_IDF_TARGET_ESP32
/**
* @brief Force a writeback of the data in the PSRAM cache. This is to be called whenever
* cache is disabled, because disabling cache on the ESP32 discards the data in the PSRAM
* cache.
*
* This is meant for use from within the SPI flash code.
*/
void esp_psram_extram_writeback_cache(void);
#endif
#ifdef __cplusplus
}
#endif