Bongjun Hur / Mbed 2 deprecated DS18B20Sensor

Simple cpp wrapper of a ds18b20, onewire 'c' library. Supports multiple sensors.

Dependencies:   mbed

Dependents:   LPC11U68_DS18B20Sensor

Fork of DS18B20Sensor by Steve Spence

DS18B20Sensor.cpp@0:1449f126b241, 2013-03-03 (annotated)

Committer:
jsteve
Date:
Sun Mar 03 01:41:51 2013 +0000
Revision:
0:1449f126b241
Child:
1:ea35ad346f25
Changed name from Sensor to DS18B20Sensor.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jsteve 0:1449f126b241 1 #include "DS18B20Sensor.h"
jsteve 0:1449f126b241 2
jsteve 0:1449f126b241 3 DS18B20Sensor::DS18B20Sensor(PinName pin) : _oneWirePort(pin)
jsteve 0:1449f126b241 4 {
jsteve 0:1449f126b241 5 _init = false;
jsteve 0:1449f126b241 6 nSensors = 0;
jsteve 0:1449f126b241 7 }
jsteve 0:1449f126b241 8
jsteve 0:1449f126b241 9 void DS18B20Sensor::getReadingText(char * text, uint8_t index)
jsteve 0:1449f126b241 10 {
jsteve 0:1449f126b241 11 uint8_t subzero, cel, cel_frac_bits;
jsteve 0:1449f126b241 12 DS18X20_read_meas( &gSensorIDs[index][0], &subzero, &cel, &cel_frac_bits);
jsteve 0:1449f126b241 13 DS18B20Sensor::getReadingText(text, subzero, cel, cel_frac_bits);
jsteve 0:1449f126b241 14 }
jsteve 0:1449f126b241 15
jsteve 0:1449f126b241 16 void DS18B20Sensor::getReadingText(char * text, uint8_t subzero, uint8_t cel, uint8_t cel_frac_bits)
jsteve 0:1449f126b241 17 {
jsteve 0:1449f126b241 18 uint16_t decicelsius;
jsteve 0:1449f126b241 19 char s[10];
jsteve 0:1449f126b241 20 float temperature;
jsteve 0:1449f126b241 21 sprintf(text,"");
jsteve 0:1449f126b241 22 sprintf(s,"%s", (subzero)?"-":"+");
jsteve 0:1449f126b241 23 strcat(text,s);
jsteve 0:1449f126b241 24 decicelsius = DS18X20_temp_to_decicel(subzero, cel, cel_frac_bits);
jsteve 0:1449f126b241 25 temperature = decicelsius;
jsteve 0:1449f126b241 26 temperature = temperature/10;
jsteve 0:1449f126b241 27 sprintf(s,"%4.1f", temperature);
jsteve 0:1449f126b241 28 strcat(text,s);
jsteve 0:1449f126b241 29
jsteve 0:1449f126b241 30 }
jsteve 0:1449f126b241 31
jsteve 0:1449f126b241 32 uint8_t DS18B20Sensor::search(void)
jsteve 0:1449f126b241 33 {
jsteve 0:1449f126b241 34 search_sensors(&nSensors, &gSensorIDs[0][0]);
jsteve 0:1449f126b241 35 _init = true;
jsteve 0:1449f126b241 36 return nSensors;
jsteve 0:1449f126b241 37 }
jsteve 0:1449f126b241 38
jsteve 0:1449f126b241 39 uint8_t DS18B20Sensor::count(void)
jsteve 0:1449f126b241 40 {
jsteve 0:1449f126b241 41 if (_init==false)
jsteve 0:1449f126b241 42 DS18B20Sensor::search();
jsteve 0:1449f126b241 43 return nSensors;
jsteve 0:1449f126b241 44 }
jsteve 0:1449f126b241 45
jsteve 0:1449f126b241 46 uint8_t DS18B20Sensor::startReading(bool includeWait)
jsteve 0:1449f126b241 47 {
jsteve 0:1449f126b241 48 uint8_t r = DS18X20_start_meas(DS18X20_POWER_EXTERN, 0 );
jsteve 0:1449f126b241 49 if ((r == DS18X20_OK) && includeWait)
jsteve 0:1449f126b241 50 wait_ms(DS18B20_TCONV_12BIT);
jsteve 0:1449f126b241 51 return r;
jsteve 0:1449f126b241 52 }
jsteve 0:1449f126b241 53
jsteve 0:1449f126b241 54 void DS18B20Sensor::getReading(uint8_t index, uint8_t *subzero, uint8_t *cel, uint8_t *cel_frac_bits)
jsteve 0:1449f126b241 55 {
jsteve 0:1449f126b241 56 DS18X20_read_meas( &gSensorIDs[index][0], subzero, cel, cel_frac_bits);
jsteve 0:1449f126b241 57 }