mirror of
https://github.com/RobTillaart/Arduino.git
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113 lines
2.2 KiB
C++
113 lines
2.2 KiB
C++
//
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// FILE: I2C_ASDX.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.3.1
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// PURPOSE: I2C_asdx library for Arduino.
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// URL: https://github.com/RobTillaart/I2C_ASDX
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//
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// HISTORY:
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// 0.1.0 2013-11-14 initial version
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// 0.2.0 2020-03-18 refactor
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// 0.2.1 2020-07-04 add getBar(), getMilliBar(), getPSI()
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// 0.2.2 2020-12-29 add Arduino-CI + unit test (minimal), keywords update.
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// 0.2.3 2021-06-06 add different units to read pressure
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// 0.3.0 2021-06-07 add multiWire interface
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// 0.3.1 2021-12-19 update library.json, license, minor edits
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#include "I2C_ASDX.h"
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I2C_ASDX::I2C_ASDX(uint8_t address, uint8_t psi, TwoWire *wire)
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{
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reset();
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_address = address;
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_wire = wire;
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_maxPressure = 0;
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if ((psi == 100) || (psi == 60) || (psi == 30) ||
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(psi == 15) || (psi == 05) || (psi == 01))
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{
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_maxPressure = psi * PSI2MILLIBAR;
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}
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_state = I2C_ASDX_INIT;
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}
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#if defined (ESP8266) || defined(ESP32)
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bool I2C_ASDX::begin(uint8_t sda, uint8_t scl)
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{
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reset();
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_wire = &Wire;
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_wire->begin(sda, scl);
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if (! isConnected())
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{
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_state = I2C_ASDX_CONNECT_ERROR;
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return false;
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}
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_state = I2C_ASDX_OK;
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return true;
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}
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#endif
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bool I2C_ASDX::begin()
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{
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reset();
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_wire->begin();
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if (! isConnected())
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{
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_state = I2C_ASDX_CONNECT_ERROR;
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return false;
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}
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_state = I2C_ASDX_OK;
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return true;
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}
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void I2C_ASDX::reset()
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{
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_errorCount = 0;
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_lastRead = 0;
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_pressure = 0;
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}
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bool I2C_ASDX::isConnected()
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{
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_wire->beginTransmission(_address);
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return (_wire->endTransmission() == 0);
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}
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int I2C_ASDX::read()
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{
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_wire->requestFrom(_address, (uint8_t)2);
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if (_wire->available() != 2)
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{
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_errorCount++;
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_state = I2C_ASDX_READ_ERROR;
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return _state;
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}
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int count = _wire->read() * 256; // hi byte
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count += _wire->read(); // lo byte
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if (count & 0xC000)
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{
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_errorCount++;
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_state = I2C_ASDX_C000_ERROR; // no documentation, bits may not be set?
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return _state;
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}
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// _pressure = map(count, 1638, 14746, 0, _maxPressure);
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// _pressure = (count - 1638) * (_maxPressure - 0) / ( 14746 - 1638);
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_pressure = (count - 1638) * _maxPressure * 7.62892889838E-5;
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_lastRead = millis();
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_state = I2C_ASDX_OK;
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return _state;
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}
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// -- END OF FILE --
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