/* .cpp - SPS30 Sensor Library Copyright (c) 2020-2021, Stefan Brand All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #include "SPS30.h" SPS30::SPS30() { } uint8_t SPS30::getSensorData(char *payload, uint8_t startbyte) { uint8_t data[30]; for (uint8_t i = 0; i < 30; i++) data[i] = 0xFF; uint16_t massPM1, massPM25, massPM4, massPM10, typPM; // Start Measuring, Integer Output write(SPS30_START_MEASUREMENT, 0x0500); // Wait for Stable Values (max 30s according to datasheet) delay(30000); if (hasData()) { write(SPS30_READ_MEASUREMENT); Wire.requestFrom(SPS30_I2C_ADDRESS, 30); if (Wire.available() != 0) { for (uint8_t i = 0; i < 30; i++) data[i] = 0xFE; Wire.readBytes(data, 30); // DEBUG OUTPUT DEBUG_PRINT("SPS30 I2C DATA: ") for (uint8_t i = 0; i < 30; i++) { DEBUG_PRINT("0x"); DEBUG_PRINT (data[i]); DEBUG_PRINT(", "); } DEBUG_PRINTLN(""); // PM1.0 if (data[2] == calcCRC(data, 2)) massPM1 = data[0] << 8 | data[1]; // PM2.5 if (data[5] == calcCRC(data+3, 2)) massPM25 = data[3] << 8 | data[4]; // PM4 if (data[8] == calcCRC(data+6, 2)) massPM4 = data[6] << 8 | data[7]; // PM10 if (data[11] == calcCRC(data+9, 2)) massPM10 = data[9] << 8 | data[10]; // Typical Size if (data[29] == calcCRC(data+27, 2)) typPM = data[27] << 8 | data[28]; } } write(SPS30_STOP_MEASUREMENT); uint16ToPayload(massPM1, payload, startbyte); uint16ToPayload(massPM25, payload, startbyte+2); uint16ToPayload(massPM4, payload, startbyte+4); uint16ToPayload(massPM10, payload, startbyte+6); uint16ToPayload(typPM, payload, startbyte+8); } // Check if Sensor has Data bool SPS30::hasData(void) { uint16_t resp = readReg(SPS30_GET_DATA_READY); return (resp == 1); } // Read a 16Bit Register uint16_t SPS30::readReg(uint16_t regAddr) { Wire.beginTransmission(SPS30_I2C_ADDRESS); Wire.write(regAddr >> 8); Wire.write(regAddr & 0xFF); Wire.endTransmission(); Wire.requestFrom(SPS30_I2C_ADDRESS, 2); if (Wire.available() != 0) { uint8_t msb = Wire.read(); uint8_t lsb = Wire.read(); return ((uint16_t)msb << 8 | lsb); } return(0); } bool SPS30::write(uint16_t cmd) { Wire.beginTransmission(SPS30_I2C_ADDRESS); Wire.write(cmd >> 8); Wire.write(cmd & 0xFF); if (Wire.endTransmission() != 0) return(false); return(true); } bool SPS30::write(uint16_t cmd, uint16_t arg){ uint8_t crcdata[2]; crcdata[0] = arg >> 8; crcdata[1] = arg & 0xFF; uint8_t csum = calcCRC(crcdata, 2); Wire.beginTransmission(SPS30_I2C_ADDRESS); Wire.write(cmd >> 8); Wire.write(cmd & 0xFF); Wire.write(arg >> 8); Wire.write(arg & 0xFF); Wire.write(csum); if (Wire.endTransmission() != 0) return(false); return(true); } // Calculate the Checksum uint8_t SPS30::calcCRC(uint8_t data[], uint8_t len) { uint8_t csum = 0xFF; for (uint8_t x = 0; x < len; x++) { csum ^= data[x]; for (uint8_t i = 0; i < 8; i++) { if ((csum & 0x80) != 0) csum = (uint8_t)((csum << 1) ^ 0x31); else csum <<= 1; } } return csum; }