300 lines
13 KiB
C
300 lines
13 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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#pragma once
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#include "esp_err.h"
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#include <stdint.h>
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#include <stdbool.h>
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#include "hal/spi_flash_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct spi_flash_chip_t;
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typedef struct spi_flash_chip_t spi_flash_chip_t;
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typedef struct esp_flash_t esp_flash_t;
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/** @brief Structure for describing a region of flash */
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typedef struct {
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uint32_t offset; ///< Start address of this region
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uint32_t size; ///< Size of the region
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} esp_flash_region_t;
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/** OS-level integration hooks for accessing flash chips inside a running OS */
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typedef struct {
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/**
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* Called before commencing any flash operation. Does not need to be
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* recursive (ie is called at most once for each call to 'end').
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*/
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esp_err_t (*start)(void *arg);
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/** Called after completing any flash operation. */
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esp_err_t (*end)(void *arg);
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/** Delay for at least 'ms' milliseconds. Called in between 'start' and 'end'. */
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esp_err_t (*delay_ms)(void *arg, unsigned ms);
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} esp_flash_os_functions_t;
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/** @brief Structure to describe a SPI flash chip connected to the system.
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Structure must be initialized before use (passed to esp_flash_init()).
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*/
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struct esp_flash_t {
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spi_flash_host_driver_t *host; ///< Pointer to hardware-specific "host_driver" structure. Must be initialized before used.
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const spi_flash_chip_t *chip_drv; ///< Pointer to chip-model-specific "adapter" structure. If NULL, will be detected during initialisation.
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const esp_flash_os_functions_t *os_func; ///< Pointer to os-specific hook structure. Call ``esp_flash_init_os_functions()`` to setup this field, after the host is properly initialized.
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void *os_func_data; ///< Pointer to argument for os-specific hooks. Left NULL and will be initialized with ``os_func``.
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esp_flash_read_mode_t read_mode; ///< Configured SPI flash read mode. Set before ``esp_flash_init`` is called.
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uint32_t size; ///< Size of SPI flash in bytes. If 0, size will be detected during initialisation.
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};
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/** @brief Initialise SPI flash chip interface.
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*
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* This function must be called before any other API functions are called for this chip.
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*
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* @note Only the ``host`` and ``read_mode`` fields of the chip structure must
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* be initialised before this function is called. Other fields may be
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* auto-detected if left set to zero or NULL.
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*
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* @note If the chip->drv pointer is NULL, chip chip_drv will be auto-detected
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* based on its manufacturer & product IDs. See
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* ``esp_flash_registered_flash_drivers`` pointer for details of this process.
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*
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* @param chip Pointer to SPI flash chip to use. If NULL, esp_flash_default_chip is substituted.
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* @return ESP_OK on success, or a flash error code if initialisation fails.
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*/
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esp_err_t esp_flash_init(esp_flash_t *chip);
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/**
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* Check if appropriate chip driver is set.
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*
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* @param chip Pointer to SPI flash chip to use. If NULL, esp_flash_default_chip is substituted.
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*
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* @return true if set, otherwise false.
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*/
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bool esp_flash_chip_driver_initialized(const esp_flash_t *chip);
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/** @brief Read flash ID via the common "RDID" SPI flash command.
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param[out] out_id Pointer to receive ID value.
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*
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* ID is a 24-bit value. Lower 16 bits of 'id' are the chip ID, upper 8 bits are the manufacturer ID.
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_read_id(esp_flash_t *chip, uint32_t *out_id);
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/** @brief Detect flash size based on flash ID.
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param[out] out_size Detected size in bytes.
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*
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* @note Most flash chips use a common format for flash ID, where the lower 4 bits specify the size as a power of 2. If
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* the manufacturer doesn't follow this convention, the size may be incorrectly detected.
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_get_size(esp_flash_t *chip, uint32_t *out_size);
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/** @brief Erase flash chip contents
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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*
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_erase_chip(esp_flash_t *chip);
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/** @brief Erase a region of the flash chip
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param start Address to start erasing flash. Must be sector aligned.
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* @param len Length of region to erase. Must also be sector aligned.
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*
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* Sector size is specifyed in chip->drv->sector_size field (typically 4096 bytes.) ESP_ERR_INVALID_ARG will be
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* returned if the start & length are not a multiple of this size.
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*
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* Erase is performed using block (multi-sector) erases where possible (block size is specified in
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* chip->drv->block_erase_size field, typically 65536 bytes). Remaining sectors are erased using individual sector erase
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* commands.
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_erase_region(esp_flash_t *chip, uint32_t start, uint32_t len);
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/** @brief Read if the entire chip is write protected
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param[out] write_protected Pointer to boolean, set to the value of the write protect flag.
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*
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* @note A correct result for this flag depends on the SPI flash chip model and chip_drv in use (via the 'chip->drv'
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* field).
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_get_chip_write_protect(esp_flash_t *chip, bool *write_protected);
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/** @brief Set write protection for the SPI flash chip
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param write_protect Boolean value for the write protect flag
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*
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* @note Correct behaviour of this function depends on the SPI flash chip model and chip_drv in use (via the 'chip->drv'
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* field).
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*
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* If write protection is enabled, destructive operations will fail with ESP_ERR_FLASH_PROTECTED.
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*
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* Some SPI flash chips may require a power cycle before write protect status can be cleared. Otherwise,
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* write protection can be removed via a follow-up call to this function.
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_set_chip_write_protect(esp_flash_t *chip, bool write_protect);
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/** @brief Read the list of individually protectable regions of this SPI flash chip.
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param[out] out_regions Pointer to receive a pointer to the array of protectable regions of the chip.
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* @param[out] out_num_regions Pointer to an integer receiving the count of protectable regions in the array returned in 'regions'.
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*
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* @note Correct behaviour of this function depends on the SPI flash chip model and chip_drv in use (via the 'chip->drv'
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* field).
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_get_protectable_regions(const esp_flash_t *chip, const esp_flash_region_t **out_regions, uint32_t *out_num_regions);
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/** @brief Detect if a region of the SPI flash chip is protected
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param region Pointer to a struct describing a protected region. This must match one of the regions returned from esp_flash_get_protectable_regions(...).
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* @param[out] out_protected Pointer to a flag which is set based on the protected status for this region.
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*
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* @note It is possible for this result to be false and write operations to still fail, if protection is enabled for the entire chip.
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*
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* @note Correct behaviour of this function depends on the SPI flash chip model and chip_drv in use (via the 'chip->drv'
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* field).
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_get_protected_region(esp_flash_t *chip, const esp_flash_region_t *region, bool *out_protected);
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/** @brief Update the protected status for a region of the SPI flash chip
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param region Pointer to a struct describing a protected region. This must match one of the regions returned from esp_flash_get_protectable_regions(...).
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* @param protect Write protection flag to set.
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*
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* @note It is possible for the region protection flag to be cleared and write operations to still fail, if protection is enabled for the entire chip.
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*
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* @note Correct behaviour of this function depends on the SPI flash chip model and chip_drv in use (via the 'chip->drv'
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* field).
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_set_protected_region(esp_flash_t *chip, const esp_flash_region_t *region, bool protect);
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/** @brief Read data from the SPI flash chip
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param buffer Pointer to a buffer where the data will be read. To get better performance, this should be in the DRAM and word aligned.
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* @param address Address on flash to read from. Must be less than chip->size field.
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* @param length Length (in bytes) of data to read.
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*
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* There are no alignment constraints on buffer, address or length.
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*
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* @note If on-chip flash encryption is used, this function returns raw (ie encrypted) data. Use the flash cache
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* to transparently decrypt data.
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*
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* @return
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* - ESP_OK: success
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* - ESP_ERR_NO_MEM: the buffer is not valid, however failed to malloc on
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* the heap.
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* - or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_read(esp_flash_t *chip, void *buffer, uint32_t address, uint32_t length);
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/** @brief Write data to the SPI flash chip
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param address Address on flash to write to. Must be previously erased (SPI NOR flash can only write bits 1->0).
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* @param buffer Pointer to a buffer with the data to write. To get better performance, this should be in the DRAM and word aligned.
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* @param length Length (in bytes) of data to write.
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*
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* There are no alignment constraints on buffer, address or length.
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_write(esp_flash_t *chip, const void *buffer, uint32_t address, uint32_t length);
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/** @brief Encrypted and write data to the SPI flash chip using on-chip hardware flash encryption
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*
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* @param chip Pointer to identify flash chip. Must have been successfully initialised via esp_flash_init()
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* @param address Address on flash to write to. 16 byte aligned. Must be previously erased (SPI NOR flash can only write bits 1->0).
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* @param buffer Pointer to a buffer with the data to write.
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* @param length Length (in bytes) of data to write. 16 byte aligned.
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*
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* @note Both address & length must be 16 byte aligned, as this is the encryption block size
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*
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* @return ESP_OK on success, or a flash error code if operation failed.
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*/
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esp_err_t esp_flash_write_encrypted(esp_flash_t *chip, uint32_t address, const void *buffer, uint32_t length);
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/** @brief Pointer to the "default" SPI flash chip, ie the main chip attached to the MCU.
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This chip is used if the 'chip' argument pass to esp_flash_xxx API functions is ever NULL.
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*/
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extern esp_flash_t *esp_flash_default_chip;
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/** @brief Initialise the default SPI flash chip
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*
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* Called by OS startup code. You do not need to call this in your own applications.
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*/
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esp_err_t esp_flash_init_default_chip(void);
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/**
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* Enable OS-level SPI flash protections in IDF
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*
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* Called by OS startup code. You do not need to call this in your own applications.
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*
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* @return ESP_OK if success, otherwise failed. See return value of ``esp_flash_init_os_functions``.
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*/
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esp_err_t esp_flash_app_init(void);
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/**
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* Enable OS-level SPI flash for a specific chip.
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*
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* @param chip The chip to init os functions.
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* @param host_id Which SPI host to use, 1 for SPI1, 2 for SPI2 (HSPI), 3 for SPI3 (VSPI)
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*
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* @return
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* - ESP_OK if success
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* - ESP_ERR_INVALID_ARG if host_id is invalid
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*/
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esp_err_t esp_flash_init_os_functions(esp_flash_t *chip, int host_id);
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#ifdef __cplusplus
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}
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#endif
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