mirror of
https://github.com/RobTillaart/Arduino.git
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390 lines
9.4 KiB
C++
390 lines
9.4 KiB
C++
//
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// FILE: MTP40C.cpp
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// AUTHOR: Rob Tillaart
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// DATE: 2021-08-20
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// VERSION: 0.2.2
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// PURPOSE: Arduino library for MTP40C MTP40D CO2 sensor
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// URL: https://github.com/RobTillaart/MTP40C
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#include "MTP40C.h"
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// debug flag, development.
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// #define MTP40_DEBUG 1
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MTP40::MTP40(Stream * str)
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{
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_ser = str;
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_buffer[0] = '\0';
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}
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bool MTP40::begin(uint8_t address)
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{
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if (address > 247) return false;
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_useAddress = false;
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_timeout = 100;
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_lastRead = 0;
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_airPressureReference = 0;
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_gasLevel = 0;
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_address = address;
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_suppressError = false;
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return isConnected();
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}
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bool MTP40::isConnected()
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{
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uint8_t addr = getAddress();
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return (addr == _address);
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}
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uint8_t MTP40::getAddress()
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{
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uint8_t cmd[8] = { 0xFE, 0x03, 0x14, 0x00, 0x01, 0x00, 0x55, 0xA5 };
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if (request(cmd, 8, 7) )
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{
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_address = _buffer[3];
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return _buffer[3];
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}
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return MTP40_INVALID_ADDRESS;
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}
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bool MTP40::setAddress(uint8_t address)
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{
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if (address > 247) return false;
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uint8_t cmd[11] = { 0xFE, 0x10, 0x04, 0x00, 0x01, 0x00, 0x01, 0x60, 0x00, 0x42, 0x58 };
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cmd[0] = _address;
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cmd[7] = address;
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if (request(cmd, 11, 8) )
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{
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_address = address;
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return true;
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}
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return false;
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}
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float MTP40::getAirPressureReference()
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{
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union
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{
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float value;
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uint8_t b[4];
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} convert;
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_lastError = MTP40_OK;
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// max read freq 1x per 4 seconds
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if (millis() - _lastRead < 4000) return _airPressureReference; // last value
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_lastRead = millis();
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uint8_t cmd[5] = { 0xFE, 0x68, 0x01, 0xFE, 0x30 };
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if (request(cmd, 5, 10))
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{
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for (uint8_t i = 0; i < 4; i++)
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{
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convert.b[i] = _buffer[4 + i];
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}
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_airPressureReference = convert.value;
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return _airPressureReference;
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}
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_lastError = MTP40_INVALID_AIR_PRESSURE;
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if (_suppressError) return _airPressureReference;
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return _lastError;
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}
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bool MTP40::setAirPressureReference(float apr)
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{
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if ((apr < 700) || (apr > 1100)) return false;
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union
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{
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float value;
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uint8_t b[4];
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} convert;
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uint8_t cmd[10] = { 0xFE, 0x67, 0x01, 0x01, 0x00, 0x40, 0x7D, 0x44, 0xC4, 0xA3 };
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convert.value = apr;
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for (uint8_t i = 0; i < 4; i++)
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{
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cmd[4 + i] = convert.b[i];
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}
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if (request(cmd, 10, 10) )
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{
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return true;
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}
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return false;
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}
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uint16_t MTP40::getGasConcentration()
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{
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_lastError = MTP40_OK;
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// max read freq 1x per 4 seconds
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if (millis() - _lastRead < 4000) return _gasLevel; // last value
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_lastRead = millis();
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uint8_t cmd[5] = { 0xFE, 0x69, 0x03, 0x7E, 0x61 };
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if (request(cmd, 5, 14) )
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{
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// check valid
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for (uint8_t i = 8; i < 12; i++)
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{
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if (_buffer[i] != 0) return 0;
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}
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_gasLevel = _buffer[5] *256 + _buffer[4];
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return _gasLevel;
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}
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_lastError = MTP40_INVALID_GAS_LEVEL;
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if (_suppressError) return _gasLevel;
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return _lastError;
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}
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bool MTP40::setSinglePointCorrection(float spc)
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{
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if ((spc < 400) || (spc > 5000)) return false;
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union
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{
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float value;
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uint8_t b[4];
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} convert;
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uint8_t cmd[9] = { 0xFE, 0x28, 0x80, 0x00, 0x80, 0x40, 0x44, 0x33, 0x22 };
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convert.value = spc;
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for (uint8_t i = 0; i < 4; i++)
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{
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cmd[3 + i] = convert.b[i];
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}
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if (request(cmd, 9, 10) )
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{
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if (_buffer[7] ) return true;
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}
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return false;
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}
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bool MTP40::getSinglePointCorrectionReady()
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{
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uint8_t cmd[5] = { 0xFE, 0x28, 0x81, 0xCE, 0x50 };
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if (request(cmd, 5, 6) )
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{
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if (_buffer[3] == 0) return true;
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}
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return false;
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}
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bool MTP40::openSelfCalibration()
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{
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uint8_t cmd[6] = { 0xFE, 0x28, 0x66, 0xFF, 0xDA, 0x24 };
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if (request(cmd, 6, 6) )
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{
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return true;
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}
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return false;
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}
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bool MTP40::closeSelfCalibration()
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{
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uint8_t cmd[6] = { 0xFE, 0x28, 0x66, 0x00, 0x9A, 0x64 };
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if (request(cmd, 6, 6) )
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{
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return true;
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}
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return false;
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}
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uint8_t MTP40::getSelfCalibrationStatus()
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{
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uint8_t cmd[5] = { 0xFE, 0x28, 0x67, 0x4F, 0xDA };
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if (request(cmd, 5, 6) )
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{
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return _buffer[3];
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}
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return 0x02;
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}
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bool MTP40::setSelfCalibrationHours(uint16_t hrs)
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{
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if ((hrs < 24) || (hrs > 720)) return false;
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uint8_t cmd[7] = { 0xFE, 0x28, 0x6A, 0x64, 0x00, 0x0E, 0xA8 };
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cmd[4] = hrs & 0xFF;
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cmd[5] = hrs / 256;
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if (request(cmd, 7, 6) )
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{
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return (_buffer[3] == 0x00);
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}
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return false;
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}
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uint16_t MTP40::getSelfCalibrationHours()
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{
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uint8_t cmd[5] = { 0xFE, 0x28, 0x69, 0xCE, 0x1E };
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if (request(cmd, 5, 9) )
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{
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return _buffer[4] * 256 + _buffer[3];
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}
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return 0xFFFF; // to indicate error.
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}
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int MTP40::lastError()
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{
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int e = _lastError;
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_lastError = MTP40_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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bool MTP40::request(uint8_t *data, uint8_t commandLength, uint8_t answerLength)
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{
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// generic or specific address
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if (_useAddress)
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{
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data[0] = _address;
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}
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else
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{
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data[0] = 0xFE; // broadcast
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}
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// calculate CRC of command
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uint16_t crc = CRC(data, commandLength - 2);
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data[commandLength - 1] = crc / 256;
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data[commandLength - 2] = crc & 0xFF;
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while (commandLength--)
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{
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#ifdef MTP40_DEBUG
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if (*data < 0x10) _ser->print(0);
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_ser->print(*data++, HEX);
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_ser->print(" ");
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#else
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_ser->write(*data++);
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#endif
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yield(); // because baud rate is low!
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}
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uint32_t start = millis();
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uint8_t i = 0;
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while (answerLength)
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{
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if (millis() - start > _timeout) return false;
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if (_ser->available())
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{
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_buffer[i] = _ser->read();
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i++;
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answerLength--;
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}
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yield(); // because baud rate is low!
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}
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return true;
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}
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// from datasheet
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uint16_t MTP40::CRC(uint8_t *data, uint16_t len)
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{
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const uint8_t auchCRCHi[] = {
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0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
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0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
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0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01,
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0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
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0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81,
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0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
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0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01,
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0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
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0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
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0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
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0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01,
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0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
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0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
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0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
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0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01,
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0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
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0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
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0x40
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};
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const uint8_t auchCRCLo[] = {
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0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4,
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0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
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0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD,
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0x1D, 0x1C, 0xDC, 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
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0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32, 0x36, 0xF6, 0xF7,
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0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,
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0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE,
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0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
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0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2,
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0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,
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0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB,
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0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
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0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0, 0x50, 0x90, 0x91,
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0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
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0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88,
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0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
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0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80,
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0x40
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};
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uint8_t uchCRCHi = 0xFF ; // High byte initialization of the CRC
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uint8_t uchCRCLo = 0xFF ; // The low byte of the CRC is initialized
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uint16_t uIndex; // Query the CRC table index
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uint16_t crc;
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while (len--) /* Complete the entire message buffer*/
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{
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uIndex = uchCRCLo ^ *data++; /* Calculate CRC */;
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uchCRCLo = uchCRCHi ^ auchCRCHi[uIndex];
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uchCRCHi = auchCRCLo[uIndex];
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}
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crc = (uint16_t)uchCRCHi * 256;
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crc += (uint16_t)uchCRCLo;
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return crc;
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}
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/////////////////////////////////////////////////////////////
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//
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// DERIVED CLASSES
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//
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MTP40C::MTP40C(Stream * str) : MTP40(str)
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{
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_type = 2;
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};
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MTP40D::MTP40D(Stream * str) : MTP40(str)
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{
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_type = 3;
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};
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// -- END OF FILE --
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