v3_firmware/lib/HM330x/HM330x.cpp

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/*
HM330x.cpp - Seeed HM330x Particle-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 <Arduino.h>
#include <inttypes.h>
#include <Wire.h>
#include "HM330x.h"
// Default Constructor
HM330x::HM330x() {};
// Initialize the Sensor
void HM330x::initialize(void) {
uint8_t retryCount = 0;
DEBUG_PRINTLN("HM330x::initialize");
// Send select command
while (!sendCmd(HM330x_SELECT)) {
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if (retryCount++ >= 10) {
DEBUG_PRINTLN("HM330x::initialize Select Failed!");
return;
} else {
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delay(500);
DEBUG_PRINTLN("HM330x::initialize Retrying Select...");
}
}
}
// Read Data From Sensor and Put Them Into the Payload Array
uint8_t HM330x::getSensorData(char *payload, uint8_t startbyte) {
uint8_t data[HM330x_DATA_LEN] = {0};
uint16_t value = 0;
DEBUG_PRINTLN("HM330x::getSensorData");
// Initialize Payload with 0s
for (uint8_t i=startbyte; i < startbyte+6; i++)
payload[i] = 0;
// Get Data from the Sensors
Wire.requestFrom(HM330x_ADDR, HM330x_DATA_LEN);
if (Wire.available()) {
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DEBUG_PRINT("HM330x::getSensorData reading I2C:")
for (uint8_t i = 0; i<HM330x_DATA_LEN; i++){
data[i] = Wire.read();
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DEBUG_PRINT(" 0x");
DEBUG_PRINT(data[i], HEX);
}
DEBUG_PRINTLN("");
if (calcSum(data) == data[HM330x_DATA_LEN-1]) {
for (uint8_t pos = 5; pos<8; pos++) {
value = bytesToUint16(data, pos);
uint16ToPayload(value, payload, startbyte);
startbyte += 2;
}
return startbyte;
}
}
return startbyte+6;
}
// Send only a Command
bool HM330x::sendCmd(uint8_t cmd) {
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DEBUG_PRINT("HM330x::sendCmd: 0x")
DEBUG_PRINTLN(cmd, HEX);
Wire.beginTransmission(HM330x_ADDR);
Wire.write(cmd);
return Wire.endTransmission();
}
// Calculate the CheckSum
uint8_t HM330x::calcSum(uint8_t bytes[]) {
uint8_t checksum = 0;
for (int i = 0; i < HM330x_DATA_LEN - 1; i++) {
checksum += bytes[i];
}
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DEBUG_PRINT("HM330x::calcSum: 0x");
DEBUG_PRINTLN(checksum, HEX);
return checksum;
}
// Get Value from Sensor Bytes Array
uint16_t HM330x::bytesToUint16(uint8_t bytes[], uint8_t pos){
return bytes[pos * 2] * 0x100 + bytes[pos * 2 + 1];
}