mirror of
https://github.com/RobTillaart/Arduino.git
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103 lines
2.2 KiB
C++
103 lines
2.2 KiB
C++
//
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// FILE: SHT31_SWW.cpp
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// AUTHOR: Rob Tillaart, Gunter Haug
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// VERSION: 0.2.0
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// DATE: 2019-02-08 (base SHT31 lib)
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// PURPOSE: Arduino library for the SHT31 temperature and humidity sensor
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// to be used with the SoftwareWire library instead of (hardware) Wire.
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// derives from SHT31 0.3.8
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// URL: https://www.adafruit.com/product/2857
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// https://github.com/RobTillaart/SHT31_SWW
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// https://github.com/RobTillaart/SHT31
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#include "SHT31_SWW.h"
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// SUPPORTED COMMANDS - single shot mode only
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#define SHT31_READ_STATUS 0xF32D
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#define SHT31_CLEAR_STATUS 0x3041
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#define SHT31_SOFT_RESET 0x30A2
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#define SHT31_HARD_RESET 0x0006
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#define SHT31_MEASUREMENT_FAST 0x2416 // page 10 datasheet
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#define SHT31_MEASUREMENT_SLOW 0x2400 // no clock stretching
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#define SHT31_HEAT_ON 0x306D
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#define SHT31_HEAT_OFF 0x3066
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#define SHT31_HEATER_TIMEOUT 180000UL // milliseconds
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SHT31_SWW::SHT31_SWW(uint8_t address, SoftwareWire * wire)
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{
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_address = address;
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_softwareWire = wire;
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_lastRead = 0;
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_rawTemperature = 0;
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_rawHumidity = 0;
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_heatTimeout = 0;
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_heaterStart = 0;
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_heaterStop = 0;
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_heaterOn = false;
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_error = SHT31_OK;
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}
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bool SHT31_SWW::begin()
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{
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if ((_address != 0x44) && (_address != 0x45))
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{
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return false;
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}
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_softwareWire->begin();
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return reset();
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}
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bool SHT31_SWW::isConnected()
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{
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_softwareWire->beginTransmission(_address);
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int rv = _softwareWire->endTransmission();
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if (rv != 0) _error = SHT31_ERR_NOT_CONNECT;
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return (rv == 0);
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}
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////////////////////////////////////////////////////
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//
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// PRIVATE
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//
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bool SHT31_SWW::writeCmd(uint16_t cmd)
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{
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_softwareWire->beginTransmission(_address);
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_softwareWire->write(cmd >> 8 );
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_softwareWire->write(cmd & 0xFF);
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if (_softwareWire->endTransmission() != 0)
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{
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_error = SHT31_ERR_WRITECMD;
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return false;
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}
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return true;
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}
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bool SHT31_SWW::readBytes(uint8_t n, uint8_t *val)
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{
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int rv = _softwareWire->requestFrom(_address, (uint8_t) n);
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if (rv == n)
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{
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for (uint8_t i = 0; i < n; i++)
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{
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val[i] = _softwareWire->read();
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}
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return true;
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}
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_error = SHT31_ERR_READBYTES;
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return false;
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}
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// -- END OF FILE --
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