mirror of https://github.com/arendst/Tasmota.git
361 lines
11 KiB
C++
361 lines
11 KiB
C++
/*
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xsns_42_scd30.ino - SCD30 CO2 sensor support for Tasmota
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Copyright (C) 2021 Frogmore42
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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_I2C
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#ifdef USE_SCD30
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/*********************************************************************************************\
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* SCD30 NDIR CO2 Temperature and Humidity sensor
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\*********************************************************************************************/
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#define XSNS_42 42
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#define XI2C_29 29 // See I2CDEVICES.md
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//#define SCD30_DEBUG
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#define SCD30_ADDRESS 0x61
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#define SCD30_MAX_MISSED_READS 3
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#define SCD30_STATE_NO_ERROR 0
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#define SCD30_STATE_ERROR_DATA_CRC 1
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#define SCD30_STATE_ERROR_READ_MEAS 2
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#define SCD30_STATE_ERROR_SOFT_RESET 3
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#define SCD30_STATE_ERROR_I2C_RESET 4
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#define SCD30_STATE_ERROR_UNKNOWN 5
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const char kScd30Commands[] PROGMEM = "Scd30|" // Prefix
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"Alt|Auto|Cal|FW|Int|Pres|TOff";
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void (*const kScd30Command[])(void) PROGMEM = {
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&CmndScd30Altitude, &CmndScd30AutoMode, &CmndScd30Calibrate, &CmndScd30Firmware, &CmndScd30Interval, &CmndScd30Pressure, &CmndScd30TempOffset };
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/********************************************************************************************/
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#include <FrogmoreScd30.h>
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FrogmoreScd30 scd30;
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struct {
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float humidity = 0.0f;
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float temperature = 0.0f;
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int error_state = SCD30_STATE_NO_ERROR;
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int loop_count = 0;
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int data_not_available_count = 0;
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int good_measure_count = 0;
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int reset_count = 0;
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int error_count = 0;
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int co2_zero_count = 0;
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int i2c_reset_count = 0;
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uint16_t interval;
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uint16_t co2 = 0;
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uint16_t co2e_avg = 0;
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bool init_once;
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bool found = false;
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bool data_valid = false;
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} Scd30;
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void Scd30Detect(void) {
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if (!I2cSetDevice(SCD30_ADDRESS)) { return; }
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scd30.begin();
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uint8_t major = 0;
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uint8_t minor = 0;
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if (scd30.getFirmwareVersion(&major, &minor)) { return; }
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if (scd30.getMeasurementInterval(&Scd30.interval)) { return; }
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if (scd30.beginMeasuring()) { return; }
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I2cSetActiveFound(SCD30_ADDRESS, "SCD30");
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Scd30.found = true;
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// AddLog(LOG_LEVEL_DEBUG, PSTR("SCD: FW v%d.%d"), major, minor);
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}
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// gets data from the sensor every 3 seconds or so to give the sensor time to gather new data
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void Scd30Update(void) {
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Scd30.loop_count++;
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if (Scd30.loop_count > (Scd30.interval - 1)) {
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uint32_t error = 0;
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switch (Scd30.error_state) {
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case SCD30_STATE_NO_ERROR: {
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error = scd30.readMeasurement(&Scd30.co2, &Scd30.co2e_avg, &Scd30.temperature, &Scd30.humidity);
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switch (error) {
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case ERROR_SCD30_NO_ERROR:
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Scd30.loop_count = 0;
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Scd30.data_valid = true;
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Scd30.good_measure_count++;
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#ifdef USE_LIGHT
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LightSetSignal(CO2_LOW, CO2_HIGH, Scd30.co2);
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#endif // USE_LIGHT
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break;
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case ERROR_SCD30_NO_DATA:
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Scd30.data_not_available_count++;
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break;
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case ERROR_SCD30_CRC_ERROR:
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Scd30.error_state = SCD30_STATE_ERROR_DATA_CRC;
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Scd30.error_count++;
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#ifdef SCD30_DEBUG
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: CRC error, CRC error: %ld, CO2 zero: %ld, good: %ld, no data: %ld, sc30_reset: %ld, i2c_reset: %ld"),
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Scd30.error_count, Scd30.co2_zero_count, Scd30.good_measure_count, Scd30.data_not_available_count, Scd30.reset_count, Scd30.i2c_reset_count);
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#endif
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break;
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case ERROR_SCD30_CO2_ZERO:
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Scd30.co2_zero_count++;
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#ifdef SCD30_DEBUG
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: CO2 zero, CRC error: %ld, CO2 zero: %ld, good: %ld, no data: %ld, sc30_reset: %ld, i2c_reset: %ld"),
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Scd30.error_count, Scd30.co2_zero_count, Scd30.good_measure_count, Scd30.data_not_available_count, Scd30.reset_count, Scd30.i2c_reset_count);
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#endif
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break;
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default: {
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Scd30.error_state = SCD30_STATE_ERROR_READ_MEAS;
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#ifdef SCD30_DEBUG
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: Update: ReadMeasurement error: 0x%lX, counter: %ld"), error, Scd30.loop_count);
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#endif
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return;
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}
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break;
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}
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}
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break;
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case SCD30_STATE_ERROR_DATA_CRC: {
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//Scd30.data_valid = false;
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#ifdef SCD30_DEBUG
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: in error state: %d, good: %ld, no data: %ld, sc30 reset: %ld, i2c reset: %ld"),
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Scd30.error_state, Scd30.good_measure_count, Scd30.data_not_available_count, Scd30.reset_count, Scd30.i2c_reset_count);
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: got CRC error, try again, counter: %ld"), Scd30.loop_count);
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#endif
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Scd30.error_state = ERROR_SCD30_NO_ERROR;
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}
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break;
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case SCD30_STATE_ERROR_READ_MEAS: {
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//Scd30.data_valid = false;
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#ifdef SCD30_DEBUG
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: in error state: %d, good: %ld, no data: %ld, sc30 reset: %ld, i2c reset: %ld"),
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Scd30.error_state, Scd30.good_measure_count, Scd30.data_not_available_count, Scd30.reset_count, Scd30.i2c_reset_count);
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: not answering, sending soft reset, counter: %ld"), Scd30.loop_count);
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#endif
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Scd30.reset_count++;
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error = scd30.softReset();
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if (error) {
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#ifdef SCD30_DEBUG
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: resetting got error: 0x%lX"), error);
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#endif
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error >>= 8;
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if (error == 4) {
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Scd30.error_state = SCD30_STATE_ERROR_SOFT_RESET;
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} else {
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Scd30.error_state = SCD30_STATE_ERROR_UNKNOWN;
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}
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} else {
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Scd30.error_state = ERROR_SCD30_NO_ERROR;
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}
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}
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break;
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case SCD30_STATE_ERROR_SOFT_RESET: {
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//Scd30.data_valid = false;
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#ifdef SCD30_DEBUG
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: in error state: %d, good: %ld, no data: %ld, sc30 reset: %ld, i2c reset: %ld"),
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Scd30.error_state, Scd30.good_measure_count, Scd30.data_not_available_count, Scd30.reset_count, Scd30.i2c_reset_count);
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: clearing i2c bus"));
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#endif
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Scd30.i2c_reset_count++;
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error = scd30.clearI2CBus();
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if (error) {
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Scd30.error_state = SCD30_STATE_ERROR_I2C_RESET;
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#ifdef SCD30_DEBUG
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: error clearing i2c bus: 0x%lX"), error);
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#endif
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} else {
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Scd30.error_state = ERROR_SCD30_NO_ERROR;
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}
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}
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break;
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default: {
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//Scd30.data_valid = false;
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#ifdef SCD30_DEBUG
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AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: unknown error state: 0x%lX"), Scd30.error_state);
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#endif
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Scd30.error_state = SCD30_STATE_ERROR_SOFT_RESET; // try again
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}
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}
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if (Scd30.loop_count > (SCD30_MAX_MISSED_READS * Scd30.interval)) {
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Scd30.data_valid = false;
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}
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}
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}
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/*********************************************************************************************\
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* Command Scd30
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\*********************************************************************************************/
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void CmndScd30Altitude(void) {
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uint16_t value = 0;
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if (XdrvMailbox.data_len > 0) {
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value = XdrvMailbox.payload;
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scd30.setAltitudeCompensation(value);
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} else {
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scd30.getAltitudeCompensation(&value);
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}
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ResponseCmndNumber(value);
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};
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void CmndScd30AutoMode(void) {
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uint16_t value = 0;
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if (XdrvMailbox.data_len > 0) {
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value = XdrvMailbox.payload;
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scd30.setCalibrationType(value);
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} else {
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scd30.getCalibrationType(&value);
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}
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ResponseCmndNumber(value);
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};
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void CmndScd30Calibrate(void) {
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uint16_t value = 0;
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if (XdrvMailbox.data_len > 0) {
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value = XdrvMailbox.payload;
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scd30.setForcedRecalibrationFactor(value);
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} else {
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scd30.getForcedRecalibrationFactor(&value);
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}
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ResponseCmndNumber(value);
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};
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void CmndScd30Firmware(void) {
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uint8_t major = 0;
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uint8_t minor = 0;
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int error = scd30.getFirmwareVersion(&major, &minor);
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if (!error) {
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float firmware = major + ((float)minor / 100);
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ResponseCmndFloat(firmware, 2);
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}
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};
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void CmndScd30Interval(void) {
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uint16_t value = 0;
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if (XdrvMailbox.data_len > 0) {
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value = XdrvMailbox.payload;
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int error = scd30.setMeasurementInterval(value);
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if (!error) {
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Scd30.interval = value;
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}
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}
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scd30.getMeasurementInterval(&value);
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ResponseCmndNumber(value);
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};
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void CmndScd30Pressure(void) {
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uint16_t value = 0;
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if (XdrvMailbox.data_len > 0) {
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value = XdrvMailbox.payload;
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scd30.setAmbientPressure(value);
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} else {
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scd30.getAmbientPressure(&value);
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}
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ResponseCmndNumber(value);
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};
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void CmndScd30TempOffset(void) {
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uint16_t value = 0;
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if (XdrvMailbox.data_len > 0) {
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value = XdrvMailbox.payload;
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scd30.setTemperatureOffset(value);
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} else {
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scd30.getTemperatureOffset(&value);
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}
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ResponseCmndNumber(value);
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};
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/********************************************************************************************/
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void Scd30Show(bool json) {
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if (Scd30.data_valid) {
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float t = ConvertTemp(Scd30.temperature);
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float h = ConvertHumidity(Scd30.humidity);
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if (json) {
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ResponseAppend_P(PSTR(",\"SCD30\":{\"" D_JSON_CO2 "\":%d,\"" D_JSON_ECO2 "\":%d,"), Scd30.co2, Scd30.co2e_avg);
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ResponseAppendTHD(t, h);
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ResponseJsonEnd();
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#ifdef USE_DOMOTICZ
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if (0 == TasmotaGlobal.tele_period) {
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DomoticzSensor(DZ_AIRQUALITY, Scd30.co2);
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DomoticzTempHumPressureSensor(t, h);
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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_CO2EAVG, "SCD30", Scd30.co2e_avg);
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WSContentSend_PD(HTTP_SNS_CO2, "SCD30", Scd30.co2);
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WSContentSend_THD("SCD30", t, h);
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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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* Interface
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\*********************************************************************************************/
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bool Xsns42(uint32_t function) {
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if (!I2cEnabled(XI2C_29)) { return false; }
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bool result = false;
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// https://github.com/arendst/Tasmota/issues/15438 and datasheet (The boot-up time is < 2 s.)
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/*
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if (FUNC_INIT == function) {
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Scd30Detect();
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}
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*/
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if (!Scd30.init_once && (FUNC_EVERY_SECOND == function) && (TasmotaGlobal.uptime > 3)) {
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Scd30.init_once = true;
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Scd30Detect();
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}
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else if (Scd30.found) {
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switch (function) {
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case FUNC_EVERY_SECOND:
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Scd30Update();
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break;
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case FUNC_COMMAND:
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result = DecodeCommand(kScd30Commands, kScd30Command);
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break;
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case FUNC_JSON_APPEND:
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Scd30Show(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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Scd30Show(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_SCD30
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#endif // USE_I2C
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