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add patch milligrad ds1820 from Jan-Benedict Glaw

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This commit is contained in:
Harald Pichler 2014-03-04 11:35:59 +01:00
parent 9906e9736c
commit f2bd00b660
1 changed files with 24 additions and 12 deletions
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36
examples/osd/climate/er-example-server.c
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@ -39,6 +39,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "contiki.h"
#include "contiki-net.h"
@ -141,7 +142,11 @@ info_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_
#endif
#if REST_RES_DS1820
/*A simple getter example. Returns the reading from ds1820 sensor*/
/* 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, "sensors/temp", "title=\"Temperatur DS1820\";rt=\"temperature-c\"");
void
ds1820_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
@ -149,22 +154,30 @@ ds1820_handler(void* request, void* response, uint8_t *buffer, uint16_t preferre
char message[100];
int length = 0; /* |<-------->| */
int grad=0;
int kgrad=0;
if(ds1820_ok[0] & 0x01){
kgrad=5;
}
grad = (int)((ds1820_ok[1] << 8) | (ds1820_ok[0])) >> 1;
union temp_raw {
int16_t s_int16;
uint16_t u_int16;
} temp_raw;
double temp_c;
int temp_integral;
int temp_centi;
const uint16_t *accept = NULL;
int num = 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 ((num==0) || (num && accept[0]==REST.type.TEXT_PLAIN))
{
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
// snprintf(message, REST_MAX_CHUNK_SIZE, "%2d.%d C",grad,kgrad);
snprintf(message, REST_MAX_CHUNK_SIZE, "%4d",grad*100+kgrad*10);
snprintf(message, REST_MAX_CHUNK_SIZE, "%d.%02d C", temp_integral, temp_centi);
length = strlen(message);
memcpy(buffer, message,length );
@ -174,8 +187,7 @@ ds1820_handler(void* request, void* response, uint8_t *buffer, uint16_t preferre
else if (num && (accept[0]==REST.type.APPLICATION_JSON))
{
REST.set_header_content_type(response, REST.type.APPLICATION_JSON);
// snprintf(message, REST_MAX_CHUNK_SIZE, "{\"temp\":\"%d.%d\"}",grad,kgrad);
snprintf(message, REST_MAX_CHUNK_SIZE, "{\"temp\":\"%4d\"}",grad*100+kgrad*10);
snprintf(message, REST_MAX_CHUNK_SIZE, "{\"temp\":\"%d.%02d\"}", temp_integral, temp_centi);
length = strlen(message);
memcpy(buffer, message,length );