85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
|
|
#ifndef __ESP_SPIRAM_H
|
|
#define __ESP_SPIRAM_H
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include "esp_err.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* @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);
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|