mirror of https://github.com/arendst/Tasmota.git
150 lines
3.7 KiB
C++
150 lines
3.7 KiB
C++
/*
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xsns_113_hc8.ino - HC8 CO2 sensor support for Tasmota
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Copyright (C) 2023 Daniel Maier
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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_HC8
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/*********************************************************************************************\
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* HC8 - CO2 sensor
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*
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* Hardware Serial will be selected if GPIO1 = [HC8 Rx]
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*/
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#define XSNS_113 113
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/*********************************************************************************************\
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* Source: https://spezifisch.codeberg.page/posts/2022-08-23/co2-sensor-reverse-engineering/
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*
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\*********************************************************************************************/
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#include <TasmotaSerial.h>
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TasmotaSerial *Hc8Serial;
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uint16_t hc8_last_ppm = 0;
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bool Hc8Initialized = false;
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/*********************************************************************************************/
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uint8_t Hc8CalculateChecksum(uint8_t *array) {
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uint8_t checksum = 0;
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for(int i = 0; i < 15; i++) {
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checksum += array[i];
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}
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return checksum;
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}
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void Hc8EverySecond(void)
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{
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if(!Hc8Initialized)
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return;
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uint8_t hc8_response[16];
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if(Hc8Serial->available() >= 16) {
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while(Hc8Serial->available()) {
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hc8_response[0] = Hc8Serial->read();
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if(hc8_response[0] == 0x42)
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break;
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}
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for(int i = 1; i < 16; i++) {
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hc8_response[i] = Hc8Serial->read();
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}
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if(*(uint16_t*)hc8_response != 0x4d42) {
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return;
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}
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uint8_t checksum = Hc8CalculateChecksum(hc8_response);
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if(hc8_response[15] != checksum) {
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return;
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}
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hc8_last_ppm = (hc8_response[6]<<8) | hc8_response[7];
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}
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}
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void Hc8Init(void)
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{
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if (PinUsed(GPIO_HC8_RXD)) {
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Hc8Serial = new TasmotaSerial(Pin(GPIO_HC8_RXD), -1, 1);
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if (Hc8Serial->begin(9600)) {
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if (Hc8Serial->hardwareSerial()) { ClaimSerial(); }
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#ifdef ESP32
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AddLog(LOG_LEVEL_DEBUG, PSTR("HC8: Serial UART%d"), Hc8Serial->getUart());
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#endif
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Hc8Initialized = true;
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}
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}
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}
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void Hc8Show(bool json)
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{
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char types[4] = "HC8";
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char model[4] = "HC8";
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if (json) {
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ResponseAppend_P(PSTR(",\"%s\":{\"" D_JSON_MODEL "\":\"%s\",\"" D_JSON_CO2 "\":\"%d\"}"),
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types, model, hc8_last_ppm);
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#ifdef USE_DOMOTICZ
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if (0 == TasmotaGlobal.tele_period) {
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DomoticzSensor(DZ_AIRQUALITY, hc8_last_ppm);
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}
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#endif // USE_DOMOTICZ
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#ifdef USE_WEBSERVER
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} else {
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WSContentSend_PD(HTTP_SNS_CO2, types, hc8_last_ppm);
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#endif // USE_WEBSERVER
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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 Xsns113(uint32_t function)
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{
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bool result = false;
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switch (function) {
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case FUNC_INIT:
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Hc8Init();
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break;
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case FUNC_EVERY_SECOND:
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Hc8EverySecond();
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break;
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case FUNC_COMMAND_SENSOR:
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if (XSNS_113 == XdrvMailbox.index) {
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result = true;
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}
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break;
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case FUNC_JSON_APPEND:
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Hc8Show(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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Hc8Show(0);
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break;
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#endif // USE_WEBSERVER
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}
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return result;
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}
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#endif // USE_HC8
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