137 lines
No EOL
4 KiB
C++
137 lines
No EOL
4 KiB
C++
/*
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DS18B20.cpp - Dallas 1-Wire Temperature 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 "DS18B20.h"
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DS18B20::DS18B20(uint8_t owpin, uint8_t resbits = 12, bool para = false) {
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onewire = new OneWire(owpin);
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parasite = para;
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switch(resbits) {
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case 9 :
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resolution = DS18B20_9_BIT;
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convtime = 300;
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break;
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case 10 :
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resolution = DS18B20_10_BIT;
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convtime = 600;
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break;
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case 11 :
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resolution = DS18B20_11_BIT;
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convtime = 900;
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break;
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default :
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resolution = DS18B20_12_BIT;
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convtime = 1200;
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}
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}
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void DS18B20::initialize(void){
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onewire->reset();
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onewire->reset_search();
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sensorcount = 0;
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while (onewire->search(addr)) {
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if (OneWire::crc8( addr, 7) == addr[7] && addr[0] != 0x00) {
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sensorcount++;
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setResolution();
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}
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}
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delay(500);
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}
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uint8_t DS18B20::numBytes(void){
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return sensorcount * 2;
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}
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void DS18B20::setResolution(void) {
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// Write Scratchpad
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onewire->reset();
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onewire->select(addr);
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onewire->write(0x4E);
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// Dummy Alarm Values (not used)
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onewire->write(0);
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onewire->write(100);
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// Write Resolution
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onewire->write(resolution);
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onewire->reset();
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}
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uint8_t DS18B20::getSensorData(char *payload, uint8_t startbyte){
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uint8_t data[9];
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int16_t value;
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// Start Conversation on all Sensors
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onewire->reset();
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onewire->skip();
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onewire->write(0x44,parasite);
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// Wait for Conversion to Finish
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delay(convtime);
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// Read Temperature from all Sensors
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onewire->reset_search();
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while (onewire->search(addr)) {
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if (OneWire::crc8(addr, 7) == addr[7] && addr[0] != 0x00) {
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// Get Data
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onewire->reset();
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onewire->select(addr);
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onewire->write(0xBE);
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for (uint8_t i = 0; i < 9; i++)
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data[i] = onewire->read();
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onewire->reset();
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if (OneWire::crc8(data, 8) == data[8]) {
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int16_t rawTemp = (((int16_t)data[1]) << 8) | data[0];
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byte cfg = (data[4] & 0x60);
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// at lower res, the low bits are undefined, so let's zero them
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switch (cfg) {
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case 0x00 :
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rawTemp = rawTemp & ~7;
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break;
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case 0x20 :
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rawTemp = rawTemp & ~3;
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break;
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case 0x40 :
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rawTemp = rawTemp & ~1;
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break;
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}
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value = ((float)rawTemp/16.0)*100;
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} else {
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value = -85;
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}
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// Add to Payload
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int16ToPayload(value, payload, startbyte);
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// Set next Startbyte
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startbyte += 2;
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delay(50);
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}
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}
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onewire->depower();
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return startbyte;
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} |