124 lines
4.4 KiB
C
124 lines
4.4 KiB
C
/*
|
|
* Copyright (c) 2014, OSDomotics, Institute of Technology.
|
|
* 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
|
|
* DS1820 Sensor Resource
|
|
*
|
|
* This is a simple GET resource that returns the temperature in Celsius
|
|
*
|
|
* \author
|
|
* Harald Pichler <harald@the-develop.net>
|
|
*/
|
|
|
|
#include "contiki.h"
|
|
|
|
#if PLATFORM_HAS_DS1820
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdint.h>
|
|
#include <math.h>
|
|
#include "rest-engine.h"
|
|
#include "dev/ds1820.h"
|
|
|
|
/* A simple getter example. Returns the reading from ds1820 sensor */
|
|
#define DS1820_TEMP_LSB 0
|
|
#define DS1820_TEMP_MSB 1
|
|
#define DS1820_COUNT_REMAIN 6
|
|
#define DS1820_COUNT_PER_C 7
|
|
|
|
//RESOURCE(ds1820, METHOD_GET, "s/temp", "title=\"Temperatur DS1820\";rt=\"temperature-c\"");
|
|
static void res_get_ds1820_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
|
|
|
|
/* A simple getter example. Returns the reading from light sensor with a simple etag */
|
|
RESOURCE(res_ds1820,
|
|
"title=\"Temperature DHTxx\";rt=\"temperature c\"",
|
|
res_get_ds1820_handler,
|
|
NULL,
|
|
NULL,
|
|
NULL);
|
|
|
|
static void
|
|
res_get_ds1820_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
|
|
{
|
|
|
|
char message[100];
|
|
int length = 0; /* |<-------->| */
|
|
union temp_raw {
|
|
int16_t s_int16;
|
|
uint16_t u_int16;
|
|
} temp_raw;
|
|
double temp_c;
|
|
int temp_integral;
|
|
int temp_centi;
|
|
|
|
unsigned int accept = -1;
|
|
REST.get_header_accept(request, &accept);
|
|
|
|
// temp = temp_read - 0.25°C + (count_per_c - count_remain) / count_per_c;
|
|
temp_raw.u_int16 = ds1820_ok[DS1820_TEMP_MSB] << 8 | ds1820_ok[DS1820_TEMP_LSB];
|
|
temp_c = temp_raw.s_int16 / 2.0
|
|
- 0.25
|
|
+ ((double) ds1820_ok[DS1820_COUNT_PER_C] - (double) ds1820_ok[DS1820_COUNT_REMAIN])
|
|
/ (double) ds1820_ok[DS1820_COUNT_PER_C];
|
|
temp_integral = (int) temp_c;
|
|
temp_centi = (int) (fabs (temp_c - (int) temp_c) * 100.0);
|
|
|
|
if(accept == -1 || accept == REST.type.TEXT_PLAIN)
|
|
{
|
|
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
|
|
snprintf(message, REST_MAX_CHUNK_SIZE, "%d.%02d C", temp_integral, temp_centi);
|
|
|
|
length = strlen(message);
|
|
memcpy(buffer, message,length );
|
|
|
|
REST.set_response_payload(response, buffer, length);
|
|
}
|
|
else if (accept == REST.type.APPLICATION_JSON)
|
|
{
|
|
REST.set_header_content_type(response, REST.type.APPLICATION_JSON);
|
|
snprintf(message, REST_MAX_CHUNK_SIZE, "{\"temp\":\"%d.%02d\"}", temp_integral, temp_centi);
|
|
|
|
length = strlen(message);
|
|
memcpy(buffer, message,length );
|
|
|
|
REST.set_response_payload(response, buffer, length);
|
|
}
|
|
else
|
|
{
|
|
REST.set_response_status(response, REST.status.NOT_ACCEPTABLE);
|
|
REST.set_response_payload(response, (uint8_t *)"Supporting content-types text/plain and application/json", 56);
|
|
}
|
|
}
|
|
#endif /* PLATFORM_HAS_DS1820 */
|