esp-idf/components/esp_hw_support/include/soc/esp32/spiram.h

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2021-06-03 07:40:09 -04:00
/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __ESP_SPIRAM_H
#define __ESP_SPIRAM_H
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include "esp_err.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef enum {
ESP_SPIRAM_SIZE_16MBITS = 0, /*!< SPI RAM size is 16 MBits */
ESP_SPIRAM_SIZE_32MBITS = 1, /*!< SPI RAM size is 32 MBits */
ESP_SPIRAM_SIZE_64MBITS = 2, /*!< SPI RAM size is 64 MBits */
ESP_SPIRAM_SIZE_INVALID, /*!< SPI RAM size is invalid */
} esp_spiram_size_t;
/**
* @brief get SPI RAM size
* @return
* - ESP_SPIRAM_SIZE_INVALID if SPI RAM not enabled or not valid
* - SPI RAM size
*/
esp_spiram_size_t esp_spiram_get_chip_size(void);
/**
* @brief Initialize spiram interface/hardware. Normally called from cpu_start.c.
*
* @return ESP_OK on success
*/
esp_err_t esp_spiram_init(void);
/**
* @brief Configure Cache/MMU for access to external SPI RAM.
*
* Normally this function is called from cpu_start, if CONFIG_SPIRAM_BOOT_INIT
* option is enabled. Applications which need to enable SPI RAM at run time
* can disable CONFIG_SPIRAM_BOOT_INIT, and call this function later.
*
* @attention this function must be called with flash cache disabled.
*/
void esp_spiram_init_cache(void);
/**
* @brief Memory test for SPI RAM. Should be called after SPI RAM 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 SPI RAM.
*
* @return true on success, false on failed memory test
*/
bool esp_spiram_test(void);
/**
* @brief Add the initialized SPI RAM to the heap allocator.
*/
esp_err_t esp_spiram_add_to_heapalloc(void);
/**
* @brief Get the size of the attached SPI RAM chip selected in menuconfig
*
* @return Size in bytes, or 0 if no external RAM chip support compiled in.
*/
size_t esp_spiram_get_size(void);
/**
* @brief Force a writeback of the data in the SPI RAM cache. This is to be called whenever
* cache is disabled, because disabling cache on the ESP32 discards the data in the SPI
* RAM cache.
*
* This is meant for use from within the SPI flash code.
*/
void esp_spiram_writeback_cache(void);
/**
* @brief get psram CS IO
*
* This interface should be called after PSRAM is enabled, otherwise it will
* return an invalid value -1/0xff.
*
* @return psram CS IO or -1/0xff if psram not enabled
*/
uint8_t esp_spiram_get_cs_io(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_spiram_reserve_dma_pool(size_t size);
/**
* @brief If SPI RAM(PSRAM) has been initialized
*
* @return
* - true SPI RAM has been initialized successfully
* - false SPI RAM hasn't been initialized or initialized failed
*/
bool esp_spiram_is_initialized(void);
#ifdef __cplusplus
}
#endif
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#endif // __ESP_SPIRAM_H