94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
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/*
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HM330x.cpp - Seeed HM330x Particle-Sensor Library
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Copyright (c) 2020-2021, Stefan Brand
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Arduino.h>
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#include <inttypes.h>
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#include <Wire.h>
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#include "HM330x.h"
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// Default Constructor
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HM330x::HM330x() {};
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// Initialize the Sensor
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void HM330x::initialize(void) {
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uint8_t retryCount = 0;
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// Send select command
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while (!sendCmd(HM330x_SELECT)) {
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if (retryCount++ >= 0) {
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return;
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} else {
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delay(100);
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}
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}
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}
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// Read Data From Sensor and Put Them Into the Payload Array
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uint8_t HM330x::getSensorData(char *payload, uint8_t startbyte) {
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uint8_t data[HM330x_DATA_LEN] = {0};
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uint16_t value = 0;
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// Initialize Payload with 0s
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for (uint8_t i=startbyte; i < startbyte+6; i++)
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payload[i] = 0;
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// Get Data from the Sensors
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Wire.requestFrom(HM330x_ADDR, HM330x_DATA_LEN);
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if (Wire.available()) {
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for (uint8_t i = 0; i<HM330x_DATA_LEN; i++)
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data[i] = Wire.read();
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if (calcSum(data) == data[HM330x_DATA_LEN-1]) {
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for (uint8_t pos = 5; pos<8; pos++) {
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value = bytesToUint16(data, pos);
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uint16ToPayload(value, payload, startbyte);
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startbyte += 2;
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}
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return startbyte;
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}
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}
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return startbyte+6;
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}
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// Send only a Command
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bool HM330x::sendCmd(uint8_t cmd) {
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Wire.beginTransmission(HM330x_ADDR);
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Wire.write(cmd);
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return Wire.endTransmission();
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}
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// Calculate the CheckSum
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uint8_t HM330x::calcSum(uint8_t bytes[]) {
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uint8_t checksum = 0;
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for (int i = 0; i < HM330x_DATA_LEN - 1; i++) {
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checksum += bytes[i];
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}
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return checksum;
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}
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// Get Value from Sensor Bytes Array
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uint16_t HM330x::bytesToUint16(uint8_t bytes[], uint8_t pos){
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return bytes[pos * 2] * 0x100 + bytes[pos * 2 + 1];
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}
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