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89 lines
1.9 KiB
C++
89 lines
1.9 KiB
C++
//
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// FILE: DS18B20_INT.cpp
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// AUTHOR: Rob.Tillaart@gmail.com
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// VERSION: 0.1.3
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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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#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* _oneWire)
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{
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_wire = _oneWire;
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_addresFound = false;
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}
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bool DS18B20_INT::begin(void)
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{
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_addresFound = false;
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for (uint8_t retries = 3; (retries > 0) && (_addresFound == false); retries--)
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{
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_wire->reset_search();
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_deviceAddress[0] = 0x00;
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_wire->search(_deviceAddress);
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_addresFound = _deviceAddress[0] != 0x00 &&
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_wire->crc8(_deviceAddress, 7) == _deviceAddress[7];
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}
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if (_addresFound)
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{
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_wire->reset();
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_wire->select(_deviceAddress);
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_wire->write(WRITESCRATCH);
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// two dummy values for LOW & HIGH ALARM
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_wire->write(0);
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_wire->write(100);
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_wire->write(TEMP_9_BIT); // lowest as we do only integer math.
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_wire->reset();
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}
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return _addresFound;
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}
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void DS18B20_INT::requestTemperatures(void)
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{
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_wire->reset();
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_wire->skip();
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_wire->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 (_wire->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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_wire->reset();
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_wire->select(_deviceAddress);
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_wire->write(READSCRATCH);
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int16_t rawTemperature = ((int16_t)_wire->read()) << 8;
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rawTemperature |= _wire->read();
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_wire->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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// -- END OF FILE --
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