mirror of https://github.com/arendst/Tasmota.git
237 lines
6.9 KiB
C++
237 lines
6.9 KiB
C++
/*
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xsns_ds18x20.ino - DS18x20 temperature sensor support for Sonoff-Tasmota
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Copyright (C) 2017 Heiko Krupp and Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_DS18x20
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/*********************************************************************************************\
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* DS18B20 - Temperature
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\*********************************************************************************************/
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#define DS18S20_CHIPID 0x10
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#define DS18B20_CHIPID 0x28
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#define MAX31850_CHIPID 0x3B
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#define W1_SKIP_ROM 0xCC
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#define W1_CONVERT_TEMP 0x44
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#define W1_READ_SCRATCHPAD 0xBE
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#define DS18X20_MAX_SENSORS 8
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#include <OneWire.h>
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OneWire *ds = NULL;
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uint8_t ds18x20_addr[DS18X20_MAX_SENSORS][8];
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uint8_t ds18x20_idx[DS18X20_MAX_SENSORS];
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uint8_t ds18x20_snsrs = 0;
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char dsbstype[9];
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void ds18x20_init()
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{
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ds = new OneWire(pin[GPIO_DSB]);
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}
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void ds18x20_search()
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{
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uint8_t num_sensors=0;
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uint8_t sensor = 0;
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uint8_t i;
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ds->reset_search();
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for (num_sensors = 0; num_sensors < DS18X20_MAX_SENSORS; num_sensors) {
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if (!ds->search(ds18x20_addr[num_sensors])) {
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ds->reset_search();
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break;
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}
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// If CRC Ok and Type DS18S20, DS18B20 or MAX31850
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if ((OneWire::crc8(ds18x20_addr[num_sensors], 7) == ds18x20_addr[num_sensors][7]) &&
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((ds18x20_addr[num_sensors][0]==DS18S20_CHIPID) || (ds18x20_addr[num_sensors][0]==DS18B20_CHIPID) || (ds18x20_addr[num_sensors][0]==MAX31850_CHIPID))) {
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num_sensors++;
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}
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}
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for (int i = 0; i < num_sensors; i++) {
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ds18x20_idx[i] = i;
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}
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for (int i = 0; i < num_sensors; i++) {
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for (int j = i + 1; j < num_sensors; j++) {
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if (uint32_t(ds18x20_addr[ds18x20_idx[i]]) > uint32_t(ds18x20_addr[ds18x20_idx[j]])) {
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std::swap(ds18x20_idx[i], ds18x20_idx[j]);
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}
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}
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}
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ds18x20_snsrs = num_sensors;
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}
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uint8_t ds18x20_sensors()
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{
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return ds18x20_snsrs;
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}
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String ds18x20_address(uint8_t sensor)
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{
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char addrStr[20];
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uint8_t i;
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for (i = 0; i < 8; i++) {
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sprintf(addrStr+2*i, "%02X", ds18x20_addr[ds18x20_idx[sensor]][i]);
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}
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return String(addrStr);
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}
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void ds18x20_convert()
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{
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ds->reset();
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ds->write(W1_SKIP_ROM); // Address all Sensors on Bus
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ds->write(W1_CONVERT_TEMP); // start conversion, no parasite power on at the end
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// delay(750); // 750ms should be enough for 12bit conv
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}
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boolean ds18x20_read(uint8_t sensor, float &t)
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{
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byte data[12];
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int8_t sign = 1;
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uint8_t i = 0;
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float temp9 = 0.0;
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uint8_t present = 0;
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t = NAN;
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ds->reset();
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ds->select(ds18x20_addr[ds18x20_idx[sensor]]);
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ds->write(W1_READ_SCRATCHPAD); // Read Scratchpad
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for (i = 0; i < 9; i++) {
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data[i] = ds->read();
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}
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if (OneWire::crc8(data, 8) == data[8]) {
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switch(ds18x20_addr[ds18x20_idx[sensor]][0]) {
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case DS18S20_CHIPID: // DS18S20
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/*
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// App_note AN162.pdf page 9
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int temp_lsb, temp_msb;
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temp_msb = data[1]; // Sign byte + lsbit
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temp_lsb = data[0]; // Temp data plus lsb
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if (temp_msb <= 0x80) temp_lsb = (temp_lsb/2); // Shift to get whole degree
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temp_msb = temp_msb & 0x80; // Mask all but the sign bit
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if (temp_msb >= 0x80) { // Negative temperature
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temp_lsb = (~temp_lsb)+1; // Twos complement
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temp_lsb = (temp_lsb/2); // Shift to get whole degree
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temp_lsb = ((-1)*temp_lsb); // Add sign bit
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}
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t = (int)temp_lsb; // Temperature in whole degree
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*/
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if (data[1] > 0x80) {
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data[0] = (~data[0]) +1;
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sign = -1; // App-Note fix possible sign error
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}
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if (data[0] & 1) {
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temp9 = ((data[0] >> 1) + 0.5) * sign;
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} else {
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temp9 = (data[0] >> 1) * sign;
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}
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t = convertTemp((temp9 - 0.25) + ((16.0 - data[6]) / 16.0));
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break;
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case DS18B20_CHIPID: // DS18B20
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case MAX31850_CHIPID: // MAX31850
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uint16_t temp12 = (data[1] << 8) + data[0];
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if (temp12 > 2047) {
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temp12 = (~temp12) +1;
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sign = -1;
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}
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t = convertTemp(sign * temp12 * 0.0625);
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break;
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}
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}
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return (!isnan(t));
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}
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/*********************************************************************************************\
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* Presentation
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\*********************************************************************************************/
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void ds18x20_type(uint8_t sensor)
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{
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strcpy_P(dsbstype, PSTR("DS18x20"));
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switch(ds18x20_addr[ds18x20_idx[sensor]][0]) {
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case DS18S20_CHIPID:
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strcpy_P(dsbstype, PSTR("DS18S20"));
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break;
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case DS18B20_CHIPID:
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strcpy_P(dsbstype, PSTR("DS18B20"));
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break;
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case MAX31850_CHIPID:
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strcpy_P(dsbstype, PSTR("MAX31850"));
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break;
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}
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}
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void ds18x20_mqttPresent(uint8_t* djson)
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{
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char stemp1[10];
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char stemp2[10];
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float t;
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byte dsxflg = 0;
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for (byte i = 0; i < ds18x20_sensors(); i++) {
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if (ds18x20_read(i, t)) { // Check if read failed
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ds18x20_type(i);
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dtostrfd(t, sysCfg.flag.temperature_resolution, stemp2);
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if (!dsxflg) {
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snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s, \"DS18x20\":{"), mqtt_data);
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*djson = 1;
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stemp1[0] = '\0';
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}
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dsxflg++;
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snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s%s\"DS%d\":{\"" D_TYPE "\":\"%s\", \"" D_ADDRESS "\":\"%s\", \"" D_TEMPERATURE "\":%s}"),
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mqtt_data, stemp1, i +1, dsbstype, ds18x20_address(i).c_str(), stemp2);
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strcpy(stemp1, ", ");
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#ifdef USE_DOMOTICZ
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if (1 == dsxflg) domoticz_sensor1(stemp2);
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#endif // USE_DOMOTICZ
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}
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}
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if (dsxflg) {
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snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s}"), mqtt_data);
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}
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}
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#ifdef USE_WEBSERVER
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String ds18x20_webPresent()
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{
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String page = "";
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char stemp[10];
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char stemp2[16];
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char sensor[80];
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float t;
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for (byte i = 0; i < ds18x20_sensors(); i++) {
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if (ds18x20_read(i, t)) { // Check if read failed
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ds18x20_type(i);
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dtostrfi(t, sysCfg.flag.temperature_resolution, stemp);
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snprintf_P(stemp2, sizeof(stemp2), PSTR("%s-%d"), dsbstype, i +1);
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snprintf_P(sensor, sizeof(sensor), HTTP_SNS_TEMP, stemp2, stemp, tempUnit());
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page += sensor;
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}
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}
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ds18x20_search(); // Check for changes in sensors number
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ds18x20_convert(); // Start Conversion, takes up to one second
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return page;
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}
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#endif // USE_WEBSERVER
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#endif // USE_DS18x20
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