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110 lines
2.4 KiB
C++
110 lines
2.4 KiB
C++
//
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// FILE: DS18B20_INT.cpp
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// AUTHOR: Rob.Tillaart@gmail.com
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// VERSION: 0.1.7
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// DATE: 2017-07-25
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// PUPROSE: library for DS18B20 temperature sensor - integer only.
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// URL: https://github.com/RobTillaart/DS18B20_INT
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//
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// HISTORY:
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// 0.1.0 2017-07-25 initial version
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// 0.1.1 2019-
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// 0.1.2 2020-08-05 refactor / sync with DS18B20
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// 0.1.3 2020-12-20 add Arduino-CI + unit test
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// 0.1.4 2021-05-26 add OneWire.reset() to begin()
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// 0.1.5 2021-06-16 add retries parameter to begin()
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// 0.1.6 2021-10-03 add dependency + fix build-CI
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// 0.1.7 2021-12-17 update library.json, license, minor edits
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#include "DS18B20_INT.h"
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// OneWire commands
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#define STARTCONVO 0x44
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#define READSCRATCH 0xBE
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#define WRITESCRATCH 0x4E
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// Device resolution
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#define TEMP_9_BIT 0x1F // 9 bit
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DS18B20_INT::DS18B20_INT(OneWire* ow)
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{
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_oneWire = ow;
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_addressFound = false;
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}
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bool DS18B20_INT::begin(uint8_t retries)
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{
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_addressFound = false;
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for (uint8_t rtr = retries; (rtr > 0) && (_addressFound == false); rtr--)
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{
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_oneWire->reset();
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_oneWire->reset_search();
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_deviceAddress[0] = 0x00;
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_oneWire->search(_deviceAddress);
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_addressFound = _deviceAddress[0] != 0x00 &&
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_oneWire->crc8(_deviceAddress, 7) == _deviceAddress[7];
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}
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if (_addressFound)
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{
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_oneWire->reset();
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_oneWire->select(_deviceAddress);
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_oneWire->write(WRITESCRATCH);
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// two dummy values for LOW & HIGH ALARM
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_oneWire->write(0);
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_oneWire->write(100);
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_oneWire->write(TEMP_9_BIT); // lowest as we do only integer math.
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_oneWire->reset();
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}
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return _addressFound;
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}
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void DS18B20_INT::requestTemperatures(void)
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{
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_oneWire->reset();
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_oneWire->skip();
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_oneWire->write(STARTCONVO, 0);
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}
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bool DS18B20_INT::isConversionComplete(void)
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{
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return (_oneWire->read_bit() == 1);
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}
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int16_t DS18B20_INT::getTempC(void)
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{
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_oneWire->reset();
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_oneWire->select(_deviceAddress);
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_oneWire->write(READSCRATCH);
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int16_t rawTemperature = ((int16_t)_oneWire->read()) << 8;
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rawTemperature |= _oneWire->read();
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_oneWire->reset();
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rawTemperature >>= 4;
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if (rawTemperature < -55) return DEVICE_DISCONNECTED;
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return rawTemperature;
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}
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bool DS18B20_INT::getAddress(uint8_t* buf)
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{
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if (_addressFound)
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{
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for (uint8_t i = 0; i < 8; i++)
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{
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buf[i] = _deviceAddress[i];
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}
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}
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return _addressFound;
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}
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// -- END OF FILE --
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