mirror of https://github.com/arendst/Tasmota.git
255 lines
7.5 KiB
C++
255 lines
7.5 KiB
C++
/*
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xsns_05_ds18x20_esp32.ino - DS18x20 temperature sensor support for Tasmota
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Copyright (C) 2020 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 ESP32
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#ifdef USE_DS18x20
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/*********************************************************************************************\
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* DS18B20 - Temperature - Multiple sensors
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\*********************************************************************************************/
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#define XSNS_05 5
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#define DS18S20_CHIPID 0x10 // +/-0.5C 9-bit
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#define DS1822_CHIPID 0x22 // +/-2C 12-bit
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#define DS18B20_CHIPID 0x28 // +/-0.5C 12-bit
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#define MAX31850_CHIPID 0x3B // +/-0.25C 14-bit
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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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const char kDs18x20Types[] PROGMEM = "DS18x20|DS18S20|DS1822|DS18B20|MAX31850";
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uint8_t ds18x20_chipids[] = { 0, DS18S20_CHIPID, DS1822_CHIPID, DS18B20_CHIPID, MAX31850_CHIPID };
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uint8_t ds18x20_address[DS18X20_MAX_SENSORS][8];
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uint8_t ds18x20_index[DS18X20_MAX_SENSORS];
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uint8_t ds18x20_valid[DS18X20_MAX_SENSORS];
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uint8_t ds18x20_sensors = 0;
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char ds18x20_types[12];
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/********************************************************************************************/
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#include <OneWire.h>
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OneWire *ds = nullptr;
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void Ds18x20Init(void) {
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ds = new OneWire(Pin(GPIO_DSB));
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Ds18x20Search();
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AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DSB D_SENSORS_FOUND " %d"), ds18x20_sensors);
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}
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void Ds18x20Search(void) {
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uint8_t num_sensors=0;
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uint8_t sensor = 0;
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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_address[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, DS1822, DS18B20 or MAX31850
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if ((OneWire::crc8(ds18x20_address[num_sensors], 7) == ds18x20_address[num_sensors][7]) &&
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((ds18x20_address[num_sensors][0]==DS18S20_CHIPID) ||
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(ds18x20_address[num_sensors][0]==DS1822_CHIPID) ||
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(ds18x20_address[num_sensors][0]==DS18B20_CHIPID) ||
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(ds18x20_address[num_sensors][0]==MAX31850_CHIPID))) {
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num_sensors++;
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}
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}
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for (uint32_t i = 0; i < num_sensors; i++) {
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ds18x20_index[i] = i;
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}
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for (uint32_t i = 0; i < num_sensors; i++) {
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for (uint32_t j = i + 1; j < num_sensors; j++) {
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if (uint32_t(ds18x20_address[ds18x20_index[i]]) > uint32_t(ds18x20_address[ds18x20_index[j]])) {
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std::swap(ds18x20_index[i], ds18x20_index[j]);
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}
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}
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}
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ds18x20_sensors = num_sensors;
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}
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void Ds18x20Convert(void) {
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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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bool Ds18x20Read(uint8_t sensor, float &t)
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{
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uint8_t data[12];
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int8_t sign = 1;
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t = NAN;
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uint8_t index = ds18x20_index[sensor];
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if (ds18x20_valid[index]) { ds18x20_valid[index]--; }
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ds->reset();
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ds->select(ds18x20_address[index]);
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ds->write(W1_READ_SCRATCHPAD); // Read Scratchpad
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for (uint32_t 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_address[index][0]) {
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case DS18S20_CHIPID: {
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int16_t tempS = (((data[1] << 8) | (data[0] & 0xFE)) << 3) | ((0x10 - data[6]) & 0x0F);
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t = ConvertTemp(tempS * 0.0625 - 0.250);
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ds18x20_valid[index] = SENSOR_MAX_MISS;
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return true;
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}
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case DS1822_CHIPID:
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case DS18B20_CHIPID: {
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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); // Divide by 16
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ds18x20_valid[index] = SENSOR_MAX_MISS;
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return true;
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}
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case MAX31850_CHIPID: {
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int16_t temp14 = (data[1] << 8) + (data[0] & 0xFC);
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t = ConvertTemp(temp14 * 0.0625); // Divide by 16
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ds18x20_valid[index] = SENSOR_MAX_MISS;
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return true;
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}
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}
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}
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AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DSB D_SENSOR_CRC_ERROR));
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return false;
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}
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void Ds18x20Name(uint8_t sensor)
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{
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uint8_t index = sizeof(ds18x20_chipids);
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while (index) {
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if (ds18x20_address[ds18x20_index[sensor]][0] == ds18x20_chipids[index]) {
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break;
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}
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index--;
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}
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GetTextIndexed(ds18x20_types, sizeof(ds18x20_types), index, kDs18x20Types);
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if (ds18x20_sensors > 1) {
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snprintf_P(ds18x20_types, sizeof(ds18x20_types), PSTR("%s%c%d"), ds18x20_types, IndexSeparator(), sensor +1);
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}
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}
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/********************************************************************************************/
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void Ds18x20EverySecond(void)
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{
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if (!ds18x20_sensors) { return; }
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if (TasmotaGlobal.uptime & 1) {
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// 2mS
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// Ds18x20Search(); // Check for changes in sensors number
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Ds18x20Convert(); // Start Conversion, takes up to one second
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} else {
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float t;
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for (uint32_t i = 0; i < ds18x20_sensors; i++) {
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// 12mS per device
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if (!Ds18x20Read(i, t)) { // Read temperature
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Ds18x20Name(i);
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AddLogMissed(ds18x20_types, ds18x20_valid[ds18x20_index[i]]);
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}
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}
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}
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}
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void Ds18x20Show(bool json)
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{
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float t;
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uint8_t dsxflg = 0;
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for (uint32_t i = 0; i < ds18x20_sensors; i++) {
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if (Ds18x20Read(i, t)) { // Check if read failed
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char temperature[33];
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dtostrfd(t, Settings.flag2.temperature_resolution, temperature);
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Ds18x20Name(i);
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if (json) {
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char address[17];
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for (uint32_t j = 0; j < 6; j++) {
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sprintf(address+2*j, "%02X", ds18x20_address[ds18x20_index[i]][6-j]); // Skip sensor type and crc
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}
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ResponseAppend_P(PSTR(",\"%s\":{\"" D_JSON_ID "\":\"%s\",\"" D_JSON_TEMPERATURE "\":%s}"), ds18x20_types, address, temperature);
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dsxflg++;
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#ifdef USE_DOMOTICZ
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if ((0 == TasmotaGlobal.tele_period) && (1 == dsxflg)) {
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DomoticzSensor(DZ_TEMP, temperature);
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}
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#endif // USE_DOMOTICZ
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#ifdef USE_KNX
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if ((0 == TasmotaGlobal.tele_period) && (1 == dsxflg)) {
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KnxSensor(KNX_TEMPERATURE, t);
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}
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#endif // USE_KNX
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#ifdef USE_WEBSERVER
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} else {
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WSContentSend_PD(HTTP_SNS_TEMP, ds18x20_types, temperature, TempUnit());
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#endif // USE_WEBSERVER
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}
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}
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xsns05(uint8_t function)
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{
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bool result = false;
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if (PinUsed(GPIO_DSB)) {
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switch (function) {
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case FUNC_INIT:
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Ds18x20Init();
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break;
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case FUNC_EVERY_SECOND:
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Ds18x20EverySecond();
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break;
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case FUNC_JSON_APPEND:
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Ds18x20Show(1);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
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Ds18x20Show(0);
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break;
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#endif // USE_WEBSERVER
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}
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}
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return result;
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}
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#endif // USE_DS18x20
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#endif // ESP32
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