mirror of
https://github.com/RobTillaart/Arduino.git
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149 lines
2.4 KiB
C++
149 lines
2.4 KiB
C++
//
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// FILE: MSP300.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.2
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// PURPOSE: Arduino library for I2C MSP300 pressure transducer.
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// URL: https://github.com/RobTillaart/MSP300
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#include "MSP300.h"
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MSP300::MSP300(const uint8_t deviceAddress, TwoWire *wire)
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{
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_address = deviceAddress;
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_wire = wire;
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_error = MSP300_OK;
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_maxValue = 100;
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_raw = 0;
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}
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#if defined (ESP8266) || defined(ESP32)
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bool MSP300::begin(int dataPin, int clockPin, int maxValue)
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{
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if ((dataPin < 255) && (clockPin < 255))
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{
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_wire->begin(dataPin, clockPin);
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} else {
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_wire->begin();
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}
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if (! isConnected()) return false;
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_maxValue = maxValue;
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return true;
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}
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#endif
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bool MSP300::begin(int maxValue)
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{
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_wire->begin();
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if (! isConnected()) return false;
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_maxValue = maxValue;
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return true;
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}
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bool MSP300::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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bool MSP300::setAddress(const uint8_t deviceAddress)
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{
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// Verify? 0x28, 0x36, 0x46, 0x48, 0x51
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_address = deviceAddress;
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return isConnected();
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}
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uint8_t MSP300::getAddress()
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{
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return _address;
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}
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/////////////////////////////////////////////
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//
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// CALIBRATION
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//
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void MSP300::setPressureCounts(uint16_t Pmin, uint16_t Pmax)
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{
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_pressureFactor = 1.0 / (Pmax - Pmin);
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}
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/////////////////////////////////////////////
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//
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// READ
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//
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uint32_t MSP300::readPT()
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{
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_request();
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_read(4); // read all data.
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// TODO check status
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// uint8_t status = (_raw >> 30);
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// 00 = OK
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// 01 = reserved
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// 10 = stale data
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// 11 = error
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return _raw;
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}
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float MSP300::getPressure()
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{
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// formula page 5 datasheet
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int pres = (_raw >> 16) && 0x3FFF;
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return pres * (_maxValue * _pressureFactor);
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}
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float MSP300::getTemperature()
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{
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int temp = (_raw >> 5) && 0x07FF;
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return temp * (200.0 / 2048) - 50.0;
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}
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int MSP300::lastError()
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{
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int e = _error;
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_error = MSP300_OK;
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return e;
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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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void MSP300::_request()
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{
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_wire->beginTransmission(_address);
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_error = _wire->endTransmission();
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}
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void MSP300::_read(uint8_t bytes)
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{
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if (_wire->requestFrom(_address, bytes) != bytes)
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{
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_error = MSP300_ERROR;
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return; // keep last value
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}
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_raw = 0;
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for (int i= 0; i < bytes; i++)
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{
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_raw <<= 8;
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_raw = _wire->read();
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}
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}
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// -- END OF FILE --
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