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[doc] updated settings manager documentation

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This commit is contained in:
Enrico Joerns 2013-10-16 02:39:50 +02:00
parent 548321e66d
commit e4db33f560
1 changed files with 22 additions and 39 deletions
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61
core/lib/settings.h
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@ -36,10 +36,14 @@
/** @file settings.h
* @brief Settings Manager
* @author Robert Quattlebaum <darco@deepdarc.com>
*/
/** @addtogroup lib
* @{ */
/** @defgroup settings_lib Settings Manager
*
* ## Overview ##
*
* The settings manager is a EEPROM-based key-value store. Keys
* The settings manager is an EEPROM-based key-value store. Keys
* are 16-bit integers and values may be up to 16,383 bytes long.
* It is intended to be used to store configuration-related information,
* like network settings, radio channels, etc.
@ -64,37 +68,13 @@
* EEPROM.
*
* Each key-value pair is stored in memory in the following format:
* <table>
* <thead>
* <td>Order</td>
* <td>Size<small> (in bytes)</small></td>
* <td>Name</td>
* <td>Description</td>
* </thead>
* <tr>
* <td>0</td>
* <td>2</td>
* <td>key</td>
* <td></td>
* </tr>
* <tr>
* <td>-2</td>
* <td>1</td>
* <td>size_check</td>
* <td>One's-complement of next byte</td>
* </tr>
* <tr>
* <td>-3</td>
* <td>1 or 2</td>
* <td>size</td>
* <td>The size of the value, in bytes.</td>
* </tr>
* <tr>
* <td>-4 or -5</td>
* <td>variable</td>
* <td>value</td>
* </tr>
* </table>
*
* | Order | Size | Name | Description |
* | -------- | -------- | ---------- | ------------------------------- |
* | 0 | 2 | key | |
* | -2 | 1 | size_check | One's-complement of next byte |
* | -3 | 1 or 2 | size | The size of the value, in bytes |
* | -4 or -5 | variable | value | |
*
* The end of the key-value pairs is denoted by the first invalid entry.
* An invalid entry has any of the following attributes:
@ -103,7 +83,7 @@
* of the size byte (or size_low byte).
* * The key has a value of 0x0000.
*
*/
* @{ */
#include <stdint.h>
#include <string.h>
@ -156,9 +136,9 @@ typedef uint16_t settings_length_t;
/** Use this when you want to retrieve the last item */
#define SETTINGS_LAST_INDEX 0xFF
/** Returned when key is invalid. */
#define SETTINGS_INVALID_KEY 0xFFFF
/** Returned if no (further) element was found. */
#define SETTINGS_INVALID_ITER EEPROM_NULL
#ifndef SETTINGS_CONF_SUPPORT_LARGE_VALUES
@ -205,10 +185,10 @@ extern settings_status_t settings_delete(settings_key_t key, uint8_t index);
typedef eeprom_addr_t settings_iter_t;
/** Will return extern SETTINGS_INVALID_ITER if the settings store is empty. */
/** Will return \ref SETTINGS_INVALID_ITER if the settings store is empty. */
extern settings_iter_t settings_iter_begin();
/** Will return extern SETTINGS_INVALID_ITER if at the end of settings list. */
/** Will return \ref SETTINGS_INVALID_ITER if at the end of settings list. */
extern settings_iter_t settings_iter_next(settings_iter_t iter);
extern uint8_t settings_iter_is_valid(settings_iter_t iter);
@ -367,3 +347,6 @@ settings_set_uint64(settings_key_t key, uint64_t value)
#endif /* !SETTINGS_CONF_SKIP_CONVENIENCE_FUNCS */
#endif /* !defined(CONTIKI_SETTINGS_H_) */
/** @} */
/** @} */