nes-proj/examples/settings-example/settings-example.c

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core/lib/settings: Generalized Settings Manager to work on any platform This commit moves the Settings Manager from the AVR codebase into the Contiki core library. Any platform that implements the Contiki EEPROM API can now use the Settings Manager's key-value store for storing their persistent configuration info. The Settings Manager is a 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. * Robust data format which requires no initialization. * Supports multiple values with the same key. * Data can be appended without erasing EEPROM. * Max size of settings data can be easily increased in the future, as long as it doesn't overlap with application data. The format was inspired by the [OLPC manufacturing data format][]. Since the beginning of EEPROM often contains application-specific information, the best place to store settings is at the end of EEPROM (the "top"). Because we are starting at the end of EEPROM, it makes sense to grow the list of key-value pairs downward, toward the start of EEPROM. Each key-value pair is stored in memory in the following format: Order | Size | Name | Description --------:|---------:|--------------|------------------------------- 0 | 2 | `key` | 16-bit key -2 | 1 | `size_check` | One's-complement of next byte -3 | 1 or 2 | `size` | The size of `value`, in bytes -4 or -5 | variable | `value` | Value associated with `key` The end of the key-value pairs is denoted by the first invalid entry. An invalid entry has any of the following attributes: * The `size_check` byte doesn't match the one's compliment of the `size` byte (or `size_low` byte). * The key has a value of 0x0000. [OLPC manufacturing data format]: http://wiki.laptop.org/go/Manufacturing_data
2012-05-17 16:03:52 +00:00
/*
* Copyright (c) 2013, Robert Quattlebaum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/**
* @file settings-example.c
* @brief Contiki example showing how to use the settings manager.
* @author Robert Quattlebaum <darco@deepdarc.com>
*/
#include "contiki.h"
#include "lib/settings.h"
#include <stdio.h> /* For printf() */
/*---------------------------------------------------------------------------*/
PROCESS(settings_example_process, "Settings Example Process");
AUTOSTART_PROCESSES(&settings_example_process);
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(settings_example_process, ev, data)
{
int i;
settings_status_t status;
settings_iter_t iter;
char hostname[30];
uint16_t panid;
uint16_t channel;
PROCESS_BEGIN();
/*************************************************************************/
/* Basic setting of parameters */
status = settings_set_uint16(SETTINGS_KEY_PAN_ID, 0xABCD);
if(SETTINGS_STATUS_OK != status) {
printf("settings-example: `set` failed: %d\n", status);
}
status = settings_set_uint8(SETTINGS_KEY_CHANNEL, 26);
if(SETTINGS_STATUS_OK != status) {
printf("settings-example: `set` failed: %d\n", status);
}
status = settings_set_cstr(SETTINGS_KEY_HOSTNAME, "contiki.local");
if(SETTINGS_STATUS_OK != status) {
printf("settings-example: `set` failed: %d\n", status);
}
/*************************************************************************/
/* Basic getting of parameters */
panid = settings_get_uint16(SETTINGS_KEY_PAN_ID, 0);
if(0xABCD != panid) {
printf("settings-example: `get` failed: value mismatch.\n");
}
channel = settings_get_uint16(SETTINGS_KEY_CHANNEL, 0);
if(26 != channel) {
printf("settings-example: `get` failed: value mismatch.\n");
}
if(!settings_get_cstr(SETTINGS_KEY_HOSTNAME, 0, hostname, sizeof(hostname))) {
printf("settings-example: `get` failed: settings_get_cstr returned NULL\n");
} else if(strcmp(hostname, "contiki.local") != 0) {
printf("settings-example: `get` failed: value mismatch.\n");
}
/*************************************************************************/
/* Adding multiple values with the same key */
for(i = 0; i < 10; i++) {
settings_add_uint8(TCC('e','x'), i + 20);
}
/*************************************************************************/
/* Reading multiple values with the same key */
for(i = 0; i < 10; i++) {
if(settings_get_uint8(TCC('e', 'x'), i) != i + 20) {
printf("settings-example: `get` failed: value mismatch.\n");
}
}
/*************************************************************************/
/* Iterating thru all settings */
for(iter = settings_iter_begin(); iter; iter = settings_iter_next(iter)) {
settings_length_t len = settings_iter_get_value_length(iter);
eeprom_addr_t addr = settings_iter_get_value_addr(iter);
uint8_t byte;
union {
settings_key_t key;
char bytes[0];
} u;
u.key = settings_iter_get_key(iter);
if(u.bytes[0] >= 32 && u.bytes[0] < 127
&& u.bytes[1] >= 32 && u.bytes[1] < 127
) {
printf("settings-example: [%c%c] = <",u.bytes[0],u.bytes[1]);
} else {
printf("settings-example: <0x%04X> = <",u.key);
}
for(; len; len--, addr++) {
eeprom_read(addr, &byte, 1);
printf("%02X", byte);
if(len != 1) {
printf(" ");
}
}
printf(">\n");
}
printf("settings-example: Done.\n");
PROCESS_END();
}
/*---------------------------------------------------------------------------*/