266 lines
13 KiB
C
266 lines
13 KiB
C
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#include "soc/spi_struct.h"
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struct esp_flash_driver;
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/** @brief Mode used for reading from SPI flash */
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typedef enum {
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ESP_FLASH_QIO, ///< Both address & data transferred using quad I/O
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ESP_FLASH_QOUT, ///< Data read using quad I/O
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ESP_FLASH_DIO, ///< Both address & data transferred using dual I/O
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ESP_FLASH_DOUT, ///< Data read using dual I/O
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ESP_FLASH_FASTRD, ///< Data read using single I/O, no limit on speed
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ESP_FLASH_SLOWRD, ///< Data read using single I/O, some limits on speed
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ESP_FLASH_READ_MODE_MAX,
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} esp_flash_read_mode_t;
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/** @brief Configured SPI flash clock speed */
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typedef enum {
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ESP_FLASH_80MHZ,
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ESP_FLASH_40MHZ,
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ESP_FLASH_26MHZ,
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ESP_FLASH_20MHZ,
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ESP_FLASH_SPEED_MAX,
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} esp_flash_speed_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;
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uint32_t size;
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} esp_flash_region_t;
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// TODO this is copied from SPI driver, should be unified somehow
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typedef struct {
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int mosi_io_num; ///< GPIO pin for Master Out Slave In (=spi_d) signal
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int miso_io_num; ///< GPIO pin for Master In Slave Out (=spi_q) signal
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int sclk_io_num; ///< GPIO pin for Spi CLocK signal
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int quadwp_io_num; ///< GPIO pin for WP (Write Protect) signal which is used as D2 in 4-bit communication modes, or -1 if not used.
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int quadhd_io_num; ///< GPIO pin for HD (HolD) signal which is used as D3 in 4-bit communication modes, or -1 if not used.
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} esp_flash_pin_cfg_t;
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/** @brief Structure to describe a SPI flash chip connected to the system.
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Structure must be passed to esp_flash_init() before use.
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*/
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typedef struct {
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spi_dev_t *spi; ///< Pointer to hardware SPI bus registers used for connection (SP1, SPI2 or SPI3). Set before initialisation.
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esp_flash_speed_t speed; ///< Configured SPI flash clock speed. Set before initialisation.
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esp_flash_read_mode_t read_mode; ///< Configured SPI flash read mode. Set before initialisation.
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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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const struct esp_flash_driver *drv; ///< Pointer to chip-model-specific "driver" structure. If NULL, will be detected during initialisatiopn.
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const esp_flash_pin_cfg_t *pins; ///< Pin configuration for the chip
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void *driver_data; ///< Currently unused, allows drivers to store driver-implementation-specific data on initialisation
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} esp_flash_chip_t;
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/** @brief Possible errors returned from SPI flash low-level API */
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typedef enum {
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FLASH_OK = 0, ///< Success
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FLASH_ERR_NOT_INITIALISED, ///< esp_flash_chip_t structure not correctly initialised by esp_flash_init().
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FLASH_ERR_INVALID_ARG, ///< A supplied argument was invalid.
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FLASH_ERR_NOT_FOUND, ///< A requested value is not found.
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FLASH_ERR_NO_RESPONSE, ///< Chip did not respond to the command, or timed out.
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FLASH_ERR_UNSUPPORTED_HOST, ///< Requested operation isn't supported via this host SPI bus (chip->spi field).
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FLASH_ERR_UNSUPPORTED_CHIP, ///< Requested operation isn't supported by this model of SPI flash chip.
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FLASH_ERR_PROTECTED, ///< Write operation failed due to chip's write protection being enabled.
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} esp_flash_err_t;
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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 spi, speed & read_mode fields of the chip structure need to be initialised. Other fields will be auto-detected
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* if left set to zero or NULL.
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*
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* @note If the chip->drv pointer is NULL, chip driver will be autodetected 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 FLASH_OK on success, or a flash error code if initialisation fails.
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*/
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esp_flash_err_t esp_flash_init(esp_flash_chip_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] 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 FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_read_id(const esp_flash_chip_t *chip, uint32_t *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] 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 FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_detect_size(const esp_flash_chip_t *chip, uint32_t *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 FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_erase_chip(const esp_flash_chip_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.) FLASH_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 FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_erase_region(const esp_flash_chip_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 driver in use (via the 'chip->drv'
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* field).
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*
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* @return FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_get_chip_write_protect(const esp_flash_chip_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_protected 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 driver 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 FLASH_ERR_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 FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_set_chip_write_protect(const esp_flash_chip_t *chip, bool write_protect_chip);
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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 regions[out] Pointer to receive a pointer to the array of protectable regions of the chip.
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* @param[out] 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 driver in use (via the 'chip->drv'
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* field).
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*
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* @return FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_get_protectable_regions(const esp_flash_chip_t *chip, const esp_flash_region_t **regions, uint32_t *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] 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 driver in use (via the 'chip->drv'
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* field).
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*
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* @return FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_get_protected_region(const esp_flash_chip_t *chip, const esp_flash_region_t *region, bool *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 protected 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 driver in use (via the 'chip->drv'
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* field).
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*
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* @return FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_set_protected_region(const esp_flash_chip_t *chip, const esp_flash_region_t *region, bool protected);
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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.
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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 FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_read(const esp_flash_chip_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.
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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 FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_write(const esp_flash_chip_t *chip, uint32_t address, const void *buffer, 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 FLASH_OK on success, or a flash error code if operation failed.
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*/
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esp_flash_err_t esp_flash_write_encrypted(const esp_flash_chip_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 const esp_flash_chip_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_flash_err_t esp_flash_init_default_chip();
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/** Enable OS-level SPI flash protections in IDF */
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void esp_flash_low_level_app_init(); /* ROM TODO move this to IDF */
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