1c3d5996a6
This is largely to aid compatibility with other non-volatile stores that have limited sized names but support a name space. This might open a path to more compact storage of the key names although that is not implemented here.
468 lines
22 KiB
C
468 lines
22 KiB
C
/*
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* Part of esp-open-rtos
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* Copyright (C) 2016 Alex Stewart
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* BSD Licensed as described in the file LICENSE
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*/
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#ifndef _SYSPARAM_H_
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#define _SYSPARAM_H_
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#include <esp/types.h>
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#ifndef DEFAULT_SYSPARAM_SECTORS
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#define DEFAULT_SYSPARAM_SECTORS 4
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#endif
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/** @file sysparam.h
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*
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* Read/write "system parameters" to persistent flash.
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*
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* System parameters are stored as key/value pairs. Keys are string values
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* between 1 and 65535 characters long. Values can be any data up to 65535
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* bytes in length (but are most commonly also text strings). Up to 126 key/
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* value pairs can be stored at a time.
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*
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* Keys and values are stored in flash using a progressive list structure
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* which allows space-efficient storage and minimizes flash erase cycles,
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* improving write speed and increasing the lifespan of the flash memory.
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*/
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/** Status codes returned by all sysparam functions
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*
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* Error codes (`SYSPARAM_ERR_*`) all have values less than zero, and can be
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* returned by any function. Values greater than zero are non-error status
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* codes which may be returned by some functions to indicate various results.
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*/
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typedef enum {
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SYSPARAM_OK = 0, ///< Success
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SYSPARAM_NOTFOUND = 1, ///< Entry not found matching criteria
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SYSPARAM_PARSEFAILED = 2, ///< Unable to parse retrieved value
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SYSPARAM_ERR_NOINIT = -1, ///< sysparam_init() must be called first
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SYSPARAM_ERR_BADVALUE = -2, ///< One or more arguments were invalid
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SYSPARAM_ERR_FULL = -3, ///< No space left in sysparam area (or too many keys in use)
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SYSPARAM_ERR_IO = -4, ///< I/O error reading/writing flash
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SYSPARAM_ERR_CORRUPT = -5, ///< Sysparam region has bad/corrupted data
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SYSPARAM_ERR_NOMEM = -6, ///< Unable to allocate memory
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} sysparam_status_t;
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/** Structure used by sysparam_iter_next() to keep track of its current state
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* and return its results. This should be initialized by calling
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* sysparam_iter_start() and cleaned up afterward by calling
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* sysparam_iter_end().
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*/
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typedef struct {
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char *ns;
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char *name;
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uint8_t *value;
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size_t value_len;
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bool binary;
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uint8_t *buffer;
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size_t bufsize;
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struct sysparam_context *ctx;
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} sysparam_iter_t;
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/** Initialize sysparam and set up the current area of flash to use.
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*
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* This must be called (and return successfully) before any other sysparam
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* routines (except sysparam_create_area()) are called.
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*
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* This should normally be taken care of automatically on boot by the OS
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* startup routines. It may be necessary to call it specially, however, if
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* the normal initialization failed, or after calling sysparam_create_area()
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* to reformat the current area.
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*
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* This routine will start at `base_addr` and scan all sectors up to
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* `top_addr` looking for a valid sysparam area. If `top_addr` is zero (or
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* equal to `base_addr`, then only the sector at `base_addr` will be checked.
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*
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* @param[in] base_addr The flash address to start looking for the start of
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* the (already present) sysparam area
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* @param[in] top_addr The flash address to stop looking for the sysparam
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* area
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*
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* @retval ::SYSPARAM_OK Initialization successful.
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* @retval ::SYSPARAM_NOTFOUND The specified address does not appear to
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* contain a sysparam area. It may be
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* necessary to call sysparam_create_area() to
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* create one first.
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_init(uint32_t base_addr, uint32_t top_addr);
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/** Create a new sysparam area in flash at the specified address.
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*
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* By default, this routine will scan the specified area to make sure it
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* appears to be empty (i.e. all 0xFF bytes) before setting it up as a new
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* sysparam area. If there appears to be other data already present, it will
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* not overwrite it. Setting `force` to `true` will cause it to clobber any
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* existing data instead.
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*
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* @param[in] base_addr The flash address at which it should start
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* (must be a multiple of the sector size)
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* @param[in] num_sectors The number of flash sectors to use for the sysparam
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* area. This should be an even number >= 2. Note
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* that the actual amount of useable parameter space
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* will be roughly half this amount.
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* @param[in] force Proceed even if the space does not appear to be empty
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*
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* @retval ::SYSPARAM_OK Area (re)created successfully.
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* @retval ::SYSPARAM_NOTFOUND `force` was not specified, and the area at
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* `base_addr` appears to have other data. No
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* action taken.
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* @retval ::SYSPARAM_ERR_BADVALUE The `num_sectors` value was not even (or
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* was zero)
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*
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* Note: This routine can create a sysparam area in another location than the
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* one currently being used, but does not change which area is currently used
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* (you will need to call sysparam_init() again if you want to do that). If
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* you reformat the area currently being used, you will also need to call
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* sysparam_init() again afterward before you will be able to continue using
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* it.
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*/
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sysparam_status_t sysparam_create_area(uint32_t base_addr, uint16_t num_sectors, bool force);
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/** Get the start address and size of the currently active sysparam area
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*
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* Fills in `base_addr` and `num_sectors` with the location and size of the
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* currently active sysparam area. The returned values correspond to the
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* arguments passed to the sysparam_create_area() call when the area was
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* originally created.
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*
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* @param[out] base_addr The flash address at which the sysparam area starts
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* @param[out] num_sectors The number of flash sectors used by the sysparam
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* area
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*
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* @retval ::SYSPARAM_OK Completed successfully
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* @retval ::SYSPARAM_ERR_NOINIT No current sysparam area is active
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*/
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sysparam_status_t sysparam_get_info(uint32_t *base_addr, uint32_t *num_sectors);
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/** Compact the sysparam area.
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*
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* This also flattens the log.
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*
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* @retval ::SYSPARAM_OK Completed successfully
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* @retval ::SYSPARAM_ERR_NOINIT No current sysparam area is active
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_compact();
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/** Get the value associated with a key
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*
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* This is the core "get value" function. It will retrieve the value for the
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* specified key in a freshly malloc()'d buffer and return it. Raw values can
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* contain any data (including zero bytes), so the `actual_length` parameter
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* should be used to determine the length of the data in the buffer.
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*
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* It is up to the caller to free() the returned buffer when done using it.
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*
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* Note: If the status result is anything other than ::SYSPARAM_OK, the value
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* in `destptr` is not changed. This means it is possible to set a default
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* value before calling this function which will be left as-is if a sysparam
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* value could not be successfully read.
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[out] destptr Pointer to a location to hold the address of the
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* returned data buffer
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* @param[out] actual_length Pointer to a location to hold the length of the
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* returned data buffer (may be NULL)
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* @param[out] is_binary Pointer to a bool to hold whether the returned
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* value is "binary" or not (may be NULL)
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*
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* @retval ::SYSPARAM_OK Value successfully retrieved.
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* @retval ::SYSPARAM_NOTFOUND Key/value not found. No buffer returned.
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* @retval ::SYSPARAM_ERR_NOINIT sysparam_init() must be called first
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_get_data(const char *ns, const char *name, uint8_t **destptr, size_t *actual_length, bool *is_binary);
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/** Get the value associated with a key (static value buffer)
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*
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* This performs the same function as sysparam_get_data() but without
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* allocating memory for the result value. It can thus be used before the heap
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* has been configured or in other cases where using the heap would be a
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* problem (i.e. in an OOM handler, etc). It requires that the caller pass in
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* a suitably sized buffer for the value to be read (if the supplied buffer is
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* not large enough, the returned value will be truncated and the full required
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* length will be returned in `actual_length`).
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[in] dest Pointer to a buffer to hold the returned value.
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* @param[in] dest_size Length of the supplied buffer in bytes.
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* @param[out] actual_length Pointer to a location to hold the actual length
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* of the data which was associated with the key
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* (may be NULL).
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* @param[out] is_binary Pointer to a bool to hold whether the returned
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* value is "binary" or not (may be NULL)
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*
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* @retval ::SYSPARAM_OK Value successfully retrieved
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* @retval ::SYSPARAM_NOTFOUND Key/value not found
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* @retval ::SYSPARAM_ERR_NOINIT sysparam_init() must be called first
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* @retval ::SYSPARAM_ERR_NOMEM The supplied buffer is too small
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_get_data_static(const char *ns, const char *name, uint8_t *dest, size_t dest_size, size_t *actual_length, bool *is_binary);
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/** Get the string value associated with a key
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*
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* This routine can be used if you know that the value in a key will (or at
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* least should) be a string. It will return a zero-terminated char buffer
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* containing the value retrieved.
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*
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* It is up to the caller to free() the returned buffer when done using it.
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*
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* Note: If the status result is anything other than ::SYSPARAM_OK, the value
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* in `destptr` is not changed. This means it is possible to set a default
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* value before calling this function which will be left as-is if a sysparam
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* value could not be successfully read.
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[out] destptr Pointer to a location to hold the address of the
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* returned data buffer
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*
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* @retval ::SYSPARAM_OK Value successfully retrieved.
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* @retval ::SYSPARAM_NOTFOUND Key/value not found.
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* @retval ::SYSPARAM_PARSEFAILED The retrieved value was a binary value
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* @retval ::SYSPARAM_ERR_NOINIT sysparam_init() must be called first
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_get_string(const char *ns, const char *name, char **destptr);
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/** Get the int32_t value associated with a key
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*
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* This routine can be used if you know that the value in a key will (or at
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* least should) be an int32_t value. This is done without allocating any
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* memory.
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*
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* Note: If the status result is anything other than ::SYSPARAM_OK, the value
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* in `result` is not changed. This means it is possible to set a default
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* value before calling this function which will be left as-is if a sysparam
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* value could not be successfully read.
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[out] result Pointer to a location to hold returned integer value
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*
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* @retval ::SYSPARAM_OK Value successfully retrieved.
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* @retval ::SYSPARAM_NOTFOUND Key/value not found.
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* @retval ::SYSPARAM_PARSEFAILED The retrieved value could not be parsed as
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* an integer.
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* @retval ::SYSPARAM_ERR_NOINIT sysparam_init() must be called first
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_get_int32(const char *ns, const char *name, int32_t *result);
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/** Get the int8_t value associated with a key
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*
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* This routine can be used if you know that the value in a key will (or at
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* least should) be a uint8_t binary value. This is done without allocating any
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* memory.
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*
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* Note: If the status result is anything other than ::SYSPARAM_OK, the value
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* in `result` is not changed. This means it is possible to set a default
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* value before calling this function which will be left as-is if a sysparam
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* value could not be successfully read.
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[out] result Pointer to a location to hold returned boolean value
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*
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* @retval ::SYSPARAM_OK Value successfully retrieved.
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* @retval ::SYSPARAM_NOTFOUND Key/value not found.
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* @retval ::SYSPARAM_PARSEFAILED The retrieved value could not be parsed as a
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* boolean setting.
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* @retval ::SYSPARAM_ERR_NOINIT sysparam_init() must be called first
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_get_int8(const char *ns, const char *name, int8_t *result);
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/** Get the boolean value associated with a key
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*
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* This routine can be used if you know that the value in a key will (or at
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* least should) be a boolean setting. It will read the specified value as a
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* text string and attempt to parse it as a boolean value.
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*
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* It will recognize the following (case-insensitive) strings:
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* * True: "yes", "y", "true", "t", "1"
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* * False: "no", "n", "false", "f", "0"
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*
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* Note: If the status result is anything other than ::SYSPARAM_OK, the value
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* in `result` is not changed. This means it is possible to set a default
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* value before calling this function which will be left as-is if a sysparam
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* value could not be successfully read.
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[out] result Pointer to a location to hold returned boolean value
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*
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* @retval ::SYSPARAM_OK Value successfully retrieved.
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* @retval ::SYSPARAM_NOTFOUND Key/value not found.
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* @retval ::SYSPARAM_PARSEFAILED The retrieved value could not be parsed as a
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* boolean setting.
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* @retval ::SYSPARAM_ERR_NOINIT sysparam_init() must be called first
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_get_bool(const char *ns, const char *name, bool *result);
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/** Set the value associated with a key
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*
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* The supplied value can be any data, up to 255 bytes in length. If `value`
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* is NULL or `value_len` is 0, this is treated as a request to delete any
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* current entry matching `key`. This is done without allocating any memory.
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*
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* If `binary` is true, the data will be considered binary (unprintable) data,
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* and this will be annotated in the saved entry. This does not affect the
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* saving or loading process in any way, but may be used by some applications
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* to (for example) print binary data differently than text entries when
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* printing parameter values.
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[in] value Pointer to a buffer containing the value data
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* @param[in] value_len Length of the data in the buffer
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* @param[in] binary Whether the data should be considered "binary"
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* (unprintable) data
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*
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* @retval ::SYSPARAM_OK Value successfully set.
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* @retval ::SYSPARAM_ERR_NOINIT sysparam_init() must be called first
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* @retval ::SYSPARAM_ERR_BADVALUE Either an empty key was provided or
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* value_len is too large
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* @retval ::SYSPARAM_ERR_FULL No space left in sysparam area
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* (or too many keys in use)
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_set_data(const char *ns, const char *name, const uint8_t *value, size_t value_len, bool binary);
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/** Set a key's value from a string
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*
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* Performs the same function as sysparam_set_data(), but accepts a
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* zero-terminated string value instead.
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[in] value Value to set (zero-terminated string)
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*
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* @retval ::SYSPARAM_OK Value successfully set.
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* @retval ::SYSPARAM_ERR_BADVALUE Either an empty key was provided or the
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* length of `value` is too large
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* @retval ::SYSPARAM_ERR_FULL No space left in sysparam area
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* (or too many keys in use)
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_set_string(const char *ns, const char *name, const char *value);
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/** Set a key's value as a number
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*
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* Write an int32_t binary value to the specified key. This does the inverse of
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* the sysparam_get_int32() function. This is done without allocating any
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* memory.
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[in] value Value to set
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*
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* @retval ::SYSPARAM_OK Value successfully set.
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* @retval ::SYSPARAM_ERR_BADVALUE An empty key was provided.
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* @retval ::SYSPARAM_ERR_FULL No space left in sysparam area
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* (or too many keys in use)
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_set_int32(const char *ns, const char *name, int32_t value);
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/** Set a key's value as a number
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*
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* Write an int8_t binary value to the specified key. This does the inverse of
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* the sysparam_get_int8() function. This is done without allocating any
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* memory.
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[in] value Value to set
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*
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* @retval ::SYSPARAM_OK Value successfully set.
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* @retval ::SYSPARAM_ERR_BADVALUE An empty key was provided.
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* @retval ::SYSPARAM_ERR_FULL No space left in sysparam area
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* (or too many keys in use)
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_set_int8(const char *ns, const char *name, int8_t value);
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/** Set a key's value as a boolean (yes/no) string
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*
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* Converts a bool value to a corresponding text string and writes it to the
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* specified key. This does the inverse of the sysparam_get_bool()
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* function.
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*
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* @param[in] key Key name (zero-terminated string)
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* @param[in] value Value to set
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*
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* @retval ::SYSPARAM_OK Value successfully set.
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* @retval ::SYSPARAM_ERR_BADVALUE An empty key was provided.
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* @retval ::SYSPARAM_ERR_FULL No space left in sysparam area
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* (or too many keys in use)
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_set_bool(const char *ns, const char *name, bool value);
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/** Begin iterating through all key/value pairs
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*
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* This function initializes a sysparam_iter_t structure to prepare it for
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* iterating through the list of key/value pairs using sysparam_iter_next().
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* This does not fetch any items (the first successive call to
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* sysparam_iter_next() will return the first key/value in the list).
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*
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* NOTE: When done, you must call sysparam_iter_end() to free the resources
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* associated with `iter`, or you will leak memory.
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*
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* @param[in] iter A pointer to a sysparam_iter_t structure to initialize
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*
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* @retval ::SYSPARAM_OK Initialization successful
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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*/
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sysparam_status_t sysparam_iter_start(sysparam_iter_t *iter);
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/** Fetch the next key/value pair
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*
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* This will retrieve the next key and value from the sysparam area, placing
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* them in `iter->key`, and `iter->value` (and updating `iter->key_len` and
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* `iter->value_len`).
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*
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* NOTE: `iter->key` and `iter->value` are static buffers local to the `iter`
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* structure, and will be overwritten with the next call to
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* sysparam_iter_next() using the same `iter`. They should *not* be free()d
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* after use.
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*
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* @param[in] iter The iterator structure to update
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*
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* @retval ::SYSPARAM_OK Next key/value retrieved
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* @retval ::SYSPARAM_ERR_NOMEM Unable to allocate memory
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* @retval ::SYSPARAM_ERR_CORRUPT Sysparam region has bad/corrupted data
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* @retval ::SYSPARAM_ERR_IO I/O error reading/writing flash
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*/
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sysparam_status_t sysparam_iter_next(sysparam_iter_t *iter);
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/** Finish iterating through keys/values
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*
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* Cleans up and releases resources allocated by sysparam_iter_start() /
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* sysparam_iter_next().
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*/
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void sysparam_iter_end(sysparam_iter_t *iter);
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#endif /* _SYSPARAM_H_ */
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